IPAC2015 - List of Keywords (dipole)

Paper	Title	Other Keywords	Page
MOXGB3	LHC Commissioning at Higher Energy	operation, injection, hardware, cryogenics	6
	P. Collier, F. Bordry, J. Wenninger CERN, Geneva, Switzerland
	The LHC has just come to the end of its first Long Shutdown (LS1) and preparations are underway to prepare for Run 2 data taking at 13 TeV centre of mass energy. After briefly recalling the major work undertaken during the 2-year long LS1, details will be given of the cool-down and hardware commissioning phase where each individual superconducting circuit is individually qualified for operation at nominal current. For the main dipole circuits this phase was completed with a quench training campaign in order to operate reliably at the required field. In parallel to the training campaign a rigorous cold checkout has been used to qualify the machine as an ensemble and to establish the conditions necessary for beam operation. The details of this phase will be given together with associated dry runs and beam injection tests. Finally, the latest news will be presented concerning the beam commissioning of the machine in preparation for first physics operation, which will hopefully begin in June.
	Slides MOXGB3 [8.452 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOXGB3
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MOPWA012	Study of Optimal MBA Lattice Structures for the SOLEIL Upgrade	emittance, lattice, optics, quadrupole	106
	R. Nagaoka, P. Brunelle, F.J. Cullinan, X.N. Gavaldà, A. Loulergue, A. Nadji, L.S. Nadolski, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	Within the context of a future upgrade of the SOLEIL ring, a series of lattice studies has been made with the aim of reducing the current 4 nm-rad horizontal emittance ex by more than an order of magnitude, with a dynamic aperture allowing off-axis injection. As in most upgrades, the important constraint imposed is to keep all the existing straight sections and photon source points. A particularity of SOLEIL are the short straight sections in half of the 16 double-bend cells, created in between the dipoles, which limits the number of dipoles in a MBA cell. In the previous studies, a combination of 5- and 4BA was followed, where with the use of longitudinal gradient bends (LGBs), ex ~440 pm-rad was obtained. The present paper reports on studies extended along the same strategy: In particular, the feasibility and the attainable ex are pursued with a combination of 7- and 6BA, by employing dipoles with transverse gradient and LGBs. In addition, the effectiveness of a few known nonlinear optimization methods, such as the resonance driving term cancellation, interleaved sextupoles with proper phases, and genetic algorithm-based numerical searches shall be explored.
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MOPWA014	New Functionality for Beam Dynamics in Accelerator Toolbox (AT)	lattice, radiation, simulation, emittance	113
	B. Nash, N. Carmignani, L. Farvacque, S.M. Liuzzo, T.P. Perron, P. Raimondi, R. Versteegen, S.M. White ESRF, Grenoble, France
	Accelerator Toolbox is a widely used code for beam dynamic simulations based on Matlab. To continue the development of the code in a collaborative manner, a SourceForge project and SVN repository called atcollab has been established. Here we describe the contributions to atcollab from the ESRF beam dynamics group. Additional modules have been developed: general matching (atmatch), improved plotting (atplot), Touschek lifetime computation via the Piwinski formula, nonlinear dynamics computations such as resonance driving terms, improved reporting of lost particles and improvements and additions to the integration routines. One example of the latter includes diffusion due to quantum fluctuations. Modeling of collective effects may now be performed using pass methods representing a variety of impedance models. Finally, routines to replace the full ring with a compact representation have been developed, facilitating studies in which many turns and many particles are required.
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MOPWA016	Increasing the Dynamic and Momentum Apertures of the ThomX Ring by Means of Octupole Correctors	sextupole, octupole, resonance, multipole	121
	J.F. Zhang, P. Bambade, A. Faus-Golfe, H. Monard LAL, Orsay, France A. Faus-Golfe IFIC, Valencia, Spain A. Loulergue SOLEIL, Gif-sur-Yvette, France
	Funding: Work is supported by ANR-10- EQPX-51 and ANR-11-IDEX-0003-02, and also by grants from Region Ile-de-France. The electron ring of the compact Compton-backscattering X-ray source ThomX which is being built at LAL featured with a small circumference of 18 meters and a low beam energy 50-70 MeV, and its long term single particle dynamics is dominated by the non linear effects in the transverse and longitudinal planes. In this paper, we study the feasibilities to reduce the sextupole resonances and then increase the dynamic aperture and momentum aperture of the ThomX ring, using octupoles correctors.
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MOPWA017	Design Status of the ESSvSB Switchyard	proton, target, quadrupole, emittance	125
	E. Bouquerel IPHC, Strasbourg Cedex 2, France
	The feasibility of the distribution of 5 MW proton beam power pulsed at 70 Hz onto a 4-target station for the production of neutrino super beams is discussed. To deflect and focus the beam having a magnetic rigidity of 11.0 Tm onto the targets, different configurations of beam switchyard are proposed and compared. The number of dipoles and quadrupoles composing this system is defined for each scenario. The length, the aperture, the magnetic fields and the field gradients of these optical elements are determined. The code TraceWin is used to simulate and optimize the envelopes of the beam along the beam lines. The transverse emittances at the exit of the system are shown.
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MOPWA019	Status of the Robinson Wiggler Project at the Metrology Light Source	wiggler, radiation, dynamic-aperture, damping	132
	T. Goetsch, J. Feikes, M. Ries, G. Wüstefeld HZB, Berlin, Germany
	The beam lifetime in electron storage rings concerns machines running in decay mode as well as machines doing top-up. A standard procedure to increase the lifetime is via bunch lengthening as the lifetime depends on the electron density in the bunch. Bunch lengthening is typically achieved with higher harmonic (Landau) cavities. As noted in , there are several advantages in using a different approach: it is possible to increase the bunch length by installing a Transverse Gradient (Robinson) Wiggler, which allows to transfer damping between the horizontal and the longitudinal plane. While increasing the bunch length, the horizontal emittance is being reduced yielding advantages regarding the source size depending on the magnet optics. At the Metrology Light Source, a primary source standard used by Germanys national metrology institute (Physikalisch-Technische Bundesanstalt), such a scheme is being investigated. The current state of the project including dynamic aperture effects and synchrotron radiation issues of the device is being presented in the following. T. Goetsch et al.,WEPRO028 in Proceedings of IPAC2014, Dresden (Germany), 2014 ** R. Klein et al., Phys. Rev. ST-AB 11, 110701, 2008
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MOPWA020	Longitudinal Stability Of Short Bunches in Storage Rings with Strong Longitudinal Focusing	impedance, synchrotron, simulation, resonance	135
	P. Kuske HZB, Berlin, Germany
	Funding: work supported by the BMBF In the BESSY VSR project, the variable bunch length storage ring, two high gradient accelerating structures at 1.5 and 1.75 GHz will be phased such that long and short bunches can be stored simultaneously. The longitudinal stability of the short bunches is investigated taking into account the shielded CSR- and a purely inductive impedance. Multi particle tracking studies and numerical solutions of the Vlasov-Fokker-Planck equation show that threshold currents for short bunches do not follow the simple scaling law which was found for long bunches. The inductive impedance can even lower the thresholds for the instability. With an 80 times increased accelerating gradient and reasonable assumptions on the inductive impedance for shorter bunches stable operation can be expected with bunches 1.8 ps long (RMS-value) and 0.8 mA current. According to the calculations and operating in a dedicated low-α mode will produce stable 40 μA bunches with 400 fs length
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MOPWA030	Simulations of Electron Cloud Long Range Wakefields	electron, wakefield, simulation, proton	165
	F.B. Petrov, O. Boine-Frankenheim TEMF, TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by the BMBF under Contract No. 05H12RD7 A typical approach to electron cloud simulations is to split the problem in two steps: buildup simulations and instability simulations. In the latter step the cloud distribution is usually refreshed after each full interaction with the bunch. This approach does not consider multibunch effects. We present studies of the long range electron cloud wakefields generated in electron clouds after interaction with relativistic proton bunch trains. Several pipe geometries - relevant to CERN accelerators - with and without external magnetic field are considered. Using simple examples we show that the long range wakefields depend significantly on the secondary emission curve as well as on the pipe geometry. Additivity of electron cloud wakefields is studied as well.
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MOPWA033	Yacs - A New 2.5D FEM Eigenmode Solver for Axisymmetric RF-Structures	cavity, multipole, quadrupole, software	175
	B.D. Isbarn, B. Riemann, M. Sommer, T. Weis DELTA, Dortmund, Germany
	Funding: Work supported by the BMBF under contract no. 05K13PEB Most feasibility studies for modern accelerator concepts, including superconducting multicell RF-cavity-resonators in circular accelerators, depend on computing a large number of eigenmode frequencies and field patterns to obtain typical figures of merit. This task includes computational intensive numerical studies. To obtain the full eigenfrequency spectra most of these studies are performed in 3D, require a great amount of computation resources and thus are limited to a few hundred or thousand eigenmodes. To overcome this issue, some codes make use of the axisymmetric geometry of most of the RF-cavity-resonator structures and solve the problem in 2D. Solving in 2D however reduces the eigenmode spectra to eigenmodes with no azimuthal dependencies (so called monopole-modes). Due to the lack of freely available and easy to use 2.5D eigenmode solvers which are able to solve for the full 3D field in a reduced 2.5 dimensional problem, we developed yet another cavity solver (Yacs), a simple FEM based solver capable of solving for the full 3D eigenmodes of axisymmetric problems while only requiring a fraction of the computation resources required by most modern 3D codes.
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MOPWA035	Two General Orbit Theorems for Efficient Measurements of Beam Optics	closed-orbit, storage-ring, optics, lattice	183
	B. Riemann, A. Ferrarotto, P. Hartmann, B.D. Isbarn, S. Koetter, M. Sommer, P. Towalski, T. Weis DELTA, Dortmund, Germany
	Closed-orbit perturbations and oscillating beam solutions in storage rings are closely related. While techniques exist to fit accelerator models to closed-orbit perturbations or to oscillation data, the exploitation of their relation has been limited. In this work, two orbit theorems that allow an efficient computation of optical parameters in storage rings with older hardware are derived for coupled linear beam motion. The monitor theorem is based on an uncoupled case study described by the author in an earlier work and has been generalized as well as simplified in mathematical abstraction to provide a reliable and computationally stable framework for beam optics measurements. It is based on a closed-orbit measurement utilizing 4 dipole correctors (2 for each plane). The corrector theorem allows to obtain parameters of these dipole correctors using two turn-by-turn monitors at almost arbitrary positions in the ring (which do not need to be located in a drift space), so that it is possible to uniquely resolve closed orbits into optical parameters without sophisticated lattice models.
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MOPWA037	Mirror Symmetric Chicane-Type Emittance Exchange Beamline with Two Deflecting Cavities	quadrupole, emittance, focusing, cavity	190
	V. Balandin, W. Decking, N. Golubeva DESY, Hamburg, Germany
	Among optical systems for transverse-to-longitudinal emittance exchange (EEX) chicane-type beamlines are of keen interest, because they do not alter the beam propagation direction. Several designs of such beamlines involving a single dipole-mode cavity (TDC) are known. In this paper we present a chicane-type EEX beamline utilizing two TDCs instead of one. The advantages of this beamline are that it is mirror symmetric and does not require an additional accelerating mode cavity for compensation of the so-called thick-lens effect, and, in the compact design, it allows better control of the beam focusing in the non-bending plane than known beamlines with one TDC.
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MOPWA044	Quasi-frozen Spin Method for EDM Deuteron Search	storage-ring, proton, simulation, lattice	213
	Y. Senichev, A. Lehrach, B. Lorentz, R. Maier FZJ, Jülich, Germany S.N. Andrianov, A.N. Ivanov St. Petersburg State University, St. Petersburg, Russia M. Berz, E. Valetov MSU, East Lansing, Michigan, USA S. Chekmenev RWTH, Aachen, Germany
	To search for EDM using proton storage ring with purely electrostatic elements the concept of frozen spin method has been proposed by BNL. This method is based on two facts: in the equation of the spin precession the magnetic field dependence is entirely eliminated and at “magic” energy the spin precession frequency coincides with the precession frequency of the momentum. In case of deuteron the anomalous magnetic moment is negative (G=-0.142), therefore we have to use the electrical and magnetic field simultaneously keeping the frozen spin direction along the momentum as in the pure electrostatic ring. In this article we suggest the concept of the quasi-frozen spin when the spin oscillates around the momentum direction within the half value of the advanced spin phase each time returning back by special optics. Due to the low value of the anomalous magnetic moment of deuteron an effective contribution to the expected EDM effect is reduced only by a few percent.
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MOPWA045	First Tests of a Beam Transport System from a Laser Wakefield Accelerator to a Transverse Gradient Undulator	electron, quadrupole, undulator, beam-transport	216
	C. Widmann, V. Afonso Rodríguez, A. Bernhard, A.-S. Müller, R. Rossmanith, W. Werner KIT, Karlsruhe, Germany M. Kaluza, M. Nicolai, M.B. Schwab, A. Sävert IOQ, Jena, Germany M. Kaluza, S. Kuschel HIJ, Jena, Germany
	An experimental setup for the generation of monochromatic undulator radiation at the laser wakefield accelerator (LWFA) in Jena using a transverse gradient undulator (TGU) is planned. Proper matching of the betatron functions and the dispersion of the electron beam to the undulator is essential. Therefor a beam transport system with strong focusing magnets and chromatic correction of these magnets is required. As a first step, a linear beam transport system without chromatic correction was assembled at the LWFA. With this setup the electron beam’s dispersion and the beta function of one selected energy are matched to the required parameters at the TGU. This contribution presents the experimental results of these measurements.
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MOPWA065	Uniformization of the Transverse Beam Profile by a New Type Nonlinear Magnet	octupole, target, multipole, simulation	272
	G. Gu, W.B. Liu IHEP, Beijing, People's Republic of China
	The uniform particle beam is desirable in many beam applications. One method to get this type of beam distribution is using octupoles, but loss of particles in the halo will be produced by this method. To reduce the beam loss, a new type of magnet is proposed in this paper. The field in the middle region of the new type magnet is similar to the octupole magnet field, but the rate of rise decline quickly in the edge. So that the particle in the edge experience a lower magnet field, and this would result in less particle loss. We also add a mechanical structure on the new type magnet to make it possible to adjust the size of middle region. So that the magnet can adapt to different transverse dimensions of the beam, and this would further reduce particle loss. Some numerical simulations have been done respectively with octuples and the new type of magnet. The simulation results show that the new type of magnet could get the uniform distribution of particle beam with less particle loss. We are processing a magnet now, and an experiment to test the magnet will be arranged on CPHS.
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MOPJE001	Effect on Beam Dynamics From Wakefields in Travelling Wave Structure Excited by Bunch Train	wakefield, simulation, electron, radiation	289
	D. Wang, C.-X. Tang TUB, Beijing, People's Republic of China W. Gai, C.-J. Jing, J.G. Power ANL, Argonne, Illinois, USA J.Q. Qiu Euclid TechLabs, LLC, Solon, Ohio, USA
	Electron bunch train technology is used to excited coherent high power RF radiation in travelling wave (TW) structures. This article concentrates on the analytical expression of wakefields excited by bunch train in TW structures and the effects of wakefields on beam dynamics. We focus on the first monopole mode and the first dipole mode wakefields. The long range wake function has a linear decrease which agrees well with the ABCi simulations. Taking example of the 11.7 GHz wakefields structure at the Argonne Wakefield Accelerator (AWA) facility, with 1.3 GHz interval drive electron bunch train, we have done the beam dynamics simulation with a point to point (P2P) code. Results shows the effects of wakefields on the energy distribution and the transverse instability for each sub-bunch.
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MOPJE051	Effect of Electron Cloud in Quadrupoles on Beam Instability	quadrupole, electron, simulation, emittance	409
	G. Iadarola, A.P. Axford, H. Bartosik, K.S.B. Li, G. Rumolo CERN, Geneva, Switzerland
	Both simulations and machine experience at the CERN-SPS and LHC have shown that the electron cloud has a lower build up threshold in quadrupoles than in dipoles and field free regions. As a consequence, while beam induced scrubbing can efficiently suppress the electron cloud in both dipoles and field free regions, a residual electron cloud can still survive in the quadrupoles and potentially degrade the beam quality. To study this effect, a PyECLOUD module for electron tracking in quadrupole fields including effects of secondary emission at the vacuum chamber has been implemented in PyHEADTAIL. With this module, the effect of the electron cloud in quadrupoles on beam stability and beam quality preservation can be assessed, as well as its impact on future LHC and HL-LHC operation.
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MOPJE052	Observations of an Anomalous Octupolar Resonance in the LHC	simulation, resonance, betatron, hadron	412
	F.S. Carlier, J.M. Coello de Portugal, A. Langner, E.H. Maclean, T. Persson, R. Tomás, R. Westenberger CERN, Geneva, Switzerland
	While linear LHC dynamics is mostly understood and under control, non-linear beam dynamics will play an increasingly important role in the challenging regimes of future LHC operation. In 2012, turn-by-turn measurements of large betatron excitations of LHC Beam 2 at injection energy were carried out. These measurements revealed an unexpectedly large spectral line in the horizontal motion with frequency Qx+2Qy. Detailed analyses and simulations are presented to unveil the nature of this spectral line.
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MOPJE057	Optics Measurement using the N-BPM Method for the ALBA Synchrotron	optics, quadrupole, betatron, synchrotron	430
	A. Langner, J.M. Coello de Portugal, R. Tomás CERN, Geneva, Switzerland G. Benedetti, M. Carlà, U. Iriso, Z. Martí ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	The N-BPM method recently developed for the LHC has significantly improved the precision of optics measurements which are based on beam position monitor (BPM) turn-by-turn data. The main improvement is owed to the consideration of correlations for statistical and systematic error sources, as well as increasing the amount of BPM combinations for one measurement. We present how this technique can be applied at light sources like ALBA, and compare the results with other methods.
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MOPJE060	BBA and Coupling Correction at CLIC RTML	emittance, coupling, quadrupole, alignment	442
	Y. Han, L. Ma SDU, Shandong, People's Republic of China A. Latina, D. Schulte CERN, Geneva, Switzerland
	The CLIC Ring To Main Linac (RTML) must transport the electron and the positron bunches through more than 20 km of beamlines with minimal emittance growth. The turnaround loops (TAL) are one of the most critical sections, featuring a lattice designed to minimize emittance growth due to synchrotron radiation emission and chromaticity, while being isochronous to avoid bunch lengthening. With such a design, the impact of static imperfections like element misalignment is particularly critical. In this paper a study of the Beam-Based Alignment (BBA) techniques in the TAL of the CLIC RTML is presented. In order to reduce the emittance growth, the one-to-one and dispersion-free corrections have been tested. The results showed that the emittance growth budgets can be met both in the horizontal and vertical planes. The impact of coupling errors due to magnets rolls on the emittance has also been studied and a coupling correction section has been designed and inserted in the lattice.
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MOPJE063	Orbit Correction in the CERN PS Booster	quadrupole, closed-orbit, alignment, booster	449
	M. McAteer, E. Benedetto, C. Carli, G.P. Di Giovanni, B. Mikulec, R. Tomás CERN, Geneva, Switzerland
	Funding: This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no (PITN-GA-2011-289485-OPAC). Prior to the Long Shutdown of 2013-2014 (LS1), control of the closed orbit in the four rings of the CERN PS Booster (PSB) was achieved by adjusting the alignment of several focusing quadrupoles. After a set of orbit corrector dipoles was installed, a major realignment campaign was undertaken to remove these intentional quadrupole offsets and any other magnet misalignments. This paper summarizes the effects of the magnet realignment on the closed orbit in the PSB and the results of closed orbit correction with corrector dipoles.
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MOPJE067	Applications of PLACET2 to the CTF3 Combiner Ring	simulation, quadrupole, optics, wiggler	462
	D. Pellegrini, R. Corsini, D. Gamba, A. Latina CERN, Geneva, Switzerland
	The CTF3 Combiner Ring (CR) is an isochronous ring that employs RF-injection to combine multiple bunch trains (up to five) into a single one with higher bunch frequency. The length of the CR plays a critical role in obtaining the correct structure of the recombined train. PLACET2: the new recirculating version of the code PLACET is particularly suited to simulate the operational scenario. In order to validate this code, three different case studies have been considered: ring-length variations due to energy detuning, fast-beam decoherence due to uncorrected chromatic effects and vertical instabilities due to bunch-to-bunch wakefield effects. The first two effects have been measured during the last run and the predictions have been validated. The instability has been compared with previous studies. The results are presented and discussed.
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MOPJE068	PLACET2: A Novel Code for Beam Dynamics in Recirculating Machines	linac, simulation, lattice, operation	465
	D. Pellegrini, A. Latina, D. Schulte CERN, Geneva, Switzerland
	Efforts have been taken to enable the simulation of recirculating machines in PLACET. The new version, PLACET2, allows handling multiple interconnected beamlines in order to obtain a realistic model of a machine. Two new elements, injectors and dumps, have been introduced and are active components of any working machine. Trains of bunches are routed through beamlines and tracked simultaneously in a parallel manner. Tracking through time-dependent elements is possible, and care is made to preserve the correct time-structure of the beam in case of beam recombination. This allows straightforward computations of multi-bunch effects arising with high-charge and shortly spaced bunch trains, even with variable train structure. The main features of the code are presented together with its working principles and its key ideas. Two case studies are introduced: LHeC and the CTF3 combiner ring.
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MOPMA011	Evaluation of Power Supply and Alignment Tolerances for the Advanced Photons Source Upgrade	sextupole, quadrupole, power-supply, factory	556
	V. Sajaev ANL, Argonne, Ilinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The hybrid seven-bend-achromat lattice that has been proposed for the Advanced Photon Source upgrade will feature very strong focusing elements and will provide an electron beam with very low emittance. In order to be able to maintain stable operation, very tight tolerances are required for various types of errors. Here we describe evaluation of the effects of various errors including magnet power supplies, alignment, and vibration. Based on this analysis, we determine short- and long-term stability requirements
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MOPMA020	Measurement and Correction of the Fermilab Booster Optics with LOCO	lattice, booster, optics, quadrupole	586
	C.-Y. Tan, V.A. Lebedev, A.K. Triplett Fermilab, Batavia, Illinois, USA M. McAteer CERN, Geneva, Switzerland
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. The optics of the original Booster lacked the ability for full optics correction and it was not until 2009 when new optics corrector packages were installed between gradient magnets that this ability became available. The optics correction method that is chosen is called LOCO (Linear Optics from Closed Orbits) that measures the orbit response from every beam position monitor (BPM) in the ring from every kick of every dipole corrector. The large data set collected allows LOCO to not only calculate the quadrupole and skew quadrupole currents that both reduces beta beatings and corrects coupling, it also finds the dipole kicker strengths, BPM calibrations and their tilts by minimizing the difference between the measured and ideal orbit response of the beam. The corrected optics have been loaded into Booster and it is currently being tested to be eventually used in normal operations.
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MOPMA025	CSR Induced Microbunching Gain Estimation including Transient Effects in Transport and Recirculation Arcs	impedance, lattice, simulation, damping	596
	C.-Y. Tsai Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA D. Douglas, R. Li, C. Tennant JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The coherent synchrotron radiation (CSR) of a high brightness electron beam traversing a series of dipoles, such as transport or recirculation arcs, may result in the microbunching instability (μBI). To accurately quantify the direct consequence of this effect, we further extend our previously developed semi-analytical simulation [C. -Y. Tsai et al., FEL Conference 2014 (THP022)] to include more relevant coherent radiation models than the steady-state free-space CSR impedance, such as the entrance and exit transient effects, which derive from upstream beam entering to and exiting from individual dipoles and propagating across the elements to downstream straight sections. Then we semi-analytically solve the linearized Vlasov equation for the amplification factor. The resultant gain functions and spectra for our example lattices are presented and compared with particle tracking simulation. Some underlying physics with inclusion of these effects are also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA025
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MOPMA039	Secondary Electron Yield Measurement and Electron Cloud Simulation at Fermilab	electron, simulation, proton, vacuum	629
	Y. Ji IIT, Chicago, Illinois, USA L.K. Spentzouris Illinois Institute of Technology, Chicago, Illinois, USA R.M. Zwaska Fermilab, Batavia, Illinois, USA
	Funding: This work was funded by the National Science Foundation under the grant no. 1205811. Fermilab Main Injector is upgrading the accelerator to double the beam intensity from 24·10¹² protons to 48·10¹² protons, which brings the accelerator into a regime where electron cloud effects may limit the accelerator performance. In fact, an instability that could be caused by electron cloud effects has already been observed in the Recycler. Secondary Electron Yield (SEY) is an important property of the vacuum chamber material that has great influence on the process of building up free electrons. The Main Injector of the Fermilab accelerator complex offers the opportunity to measure SEY and conditioning effects in the environment of a running accelerator, since samples of these materials are located at the beampipe wall. The SEY of stainless steel (SS316L) and TiN coated SS316L in the proximity of the proton beam were measured and compared. A series of simulation studies of electron cloud build up were done for the Main Injector and Recycler using the code POSINST. Parametric studies were done to determine the maximum electron density vs. peak SEY at different beam intensities in the Fermilab Main Injector. Threshold simulations of electron cloud density verus SEY were extended from Main Injector to include the Recycler Ring. It was found that the electron cloud density around the beam depends on bunch location within the bunch train.
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MOPMA040	Analysis of Beam Transverse Instabilities at Fermilab	space-charge, coupling, impedance, quadrupole	633
	T. Zolkin University of Chicago, Chicago, Illinois, USA
	The transverse beam dynamics in Fermilab Recycler ring has been analyzed using SCHARGEV Vlasov solver. In the first part of paper we discuss how SCHARGEV analyses collective instabilities for Gaussian bunch with strong space charge in resistive impedance environment. In the second part the bunched beam dynamics is studied depending on head-tail phase and damper gain. An example for Fermilab Recycler is presented.
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MOPMA041	Experimental Observation of Head-Tail Modes for Fermilab Booster	booster, linac, space-charge, betatron	636
	T. Zolkin University of Chicago, Chicago, Illinois, USA A.V. Burov, V.A. Lebedev Fermilab, Batavia, Illinois, USA
	The Fermilab Booster is known to suffer from beam transverse instabilities. An experimental attempt of head-tail modes extraction from the stable beam motion by periodic excitement of betatron motion has been performed. The shapes of head-tail modes have been successfully obtained while eigenfrequencies separation from the betatron tune were too small to be resolved. The qualitative agreement between the theory and an experimental data has been demonstrated. This is an important step towards the understanding of general theory of collective instabilities for strong space charge case, which is a rather typical case for hadron machines.
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MOPMA051	Generation of Modulated Bunch Using a Masked Chicane for Beam-Driven Acceleration Experiments at ASTA	simulation, bunching, space-charge, emittance	666
	Y.-M. Shin, P. Piot Northern Illinois University, DeKalb, Illinois, USA D.R. Broemmelsiek, D.J. Crawford, A.H. Lumpkin Fermilab, Batavia, Illinois, USA A.T. Green Northern Illinois Univerity, Dekalb, Illinois, USA
	Funding: This work was supported by the DOE contract No. DEAC02-07CH11359 to the Fermi Research Alliance LLC. Longitudinal density modulations on electron beams can improve machine performance of beam-driven accelerators and FELs with resonance beam-wave coupling . The sub-ps beam modulation has been studied with a masked chicane * *** by the analytic model and simulations with the beam parameters of the Advanced Superconducting Test Accelerator (ASTA) in Fermilab. With the nominal 50 MeV chicane parameters and 3 ps bunch length, the analytic model showed that a slit-mask with slit period 900 um and aperture width 300 μm generates about 100-um modulation periodicity with 2.4% correlated energy spread. With the designed slit mask and a 3 ps bunch, particle-in-cell simulations (CST-PS), including nonlinear energy distributions, space charge force, and coherent synchrotron radiation (CSR) effect, also result in ~ 100 um of longitudinal modulation. The beam modulation has been extensively examined with three different beam conditions, 0.25, 1 , and 3.2 nC, by extended 3D tracking simulations (Elegant). The modulated bunch generation will be tested by a slit-mask installed at the chicane of the ASTA 50-MeV-injector beamline for beam-driven acceleration experiments. * E. Kallos, Southern California 2008 D. C. Nguyen, B. E. Carlston, NIMA 375, 597 (1996) * P. Muggli, V. Yakimenko, M. Babzien, E. Kallos, and K. P. Kusche, PRL 101, 054801 (2008)
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MOPMN010	Non-linear Magnetic Inserts for the Integrable Optics Test Accelerator	vacuum, alignment, optics, quadrupole	724
	F.H. O'Shea, R.B. Agustsson, Y.C. Chen, E. Spranza RadiaBeam, Santa Monica, California, USA D.W. Martin, J.D. McNevin RadiaBeam Systems, Santa Monica, California, USA
	We present here a status update of the manufacture and magnetic measurements of the non-linear inserts for the Integrable Optics Test Accelerator. RadiaBeam Technologies is designing the 2-meter structure from magnetic field specifications, including pole design, measurement systems and alignment fiducialization. Herein, we will describe the current state of the project.
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MOPMN028	Design of Bunch Compressing System with Suppression of Coherent Synchrotron Radiation for ATF Upgrade	emittance, electron, simulation, linac	760
	Y.C. Jing, M.G. Fedurin, D. Stratakis BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Brookhaven National Laboratory Accelerator Test Facility (BNL ATF) is in the process of upgrading to ATF2 with higher electron beam energy thus expanding its capabilities. For the fully upgraded electron beam (500 MeV), it will be of great interest to compress the bunch to femto-seconds scale while maintaining high peak current (~7,800 amps) for users. A bunch compressor composed of magnetic chicanes can be utilized for this purpose. However, during such strong compression, beam quality can easily be deteriorated by Coherent Synchrotron Radiation (CSR). In this paper, we present our study for a bunch compressor where this CSR effect is compensated through careful manipulation of phase space. We also show a beam with good quality is preserved through the system by presenting a start to end simulation.
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MOPHA041	Laser Wire Based Transverse Emittance Measurement of H⁻ Beam at Spallation Neutron Source	emittance, laser, electron, neutron	879
	Y. Liu, A.V. Aleksandrov, C.D. Long, A.A. Menshov, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. A laser wire based transverse emittance measurement system has been developed at the Spallation Neutron Source (SNS). The system enables a nonintrusive measurement of the transverse emittance in both directions on a 925 MeV/1 MW hydrogen ion (H⁻) beam at the high energy beam transport (HEBT) beam line.
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MOPTY004	Wakefield Monitor Experiments with X-Band Accelerating Structures	wakefield, linac, pick-up, hardware	947
	R.L. Lillestøl, E. Adli, J. Pfingstner University of Oslo, Oslo, Norway R. Corsini, S. Döbert, W. Farabolini, L. Malina, W. Wuensch CERN, Geneva, Switzerland
	The accelerating structures for CLIC must be aligned with a precision of a few um with respect to the beam trajectory in order to mitigate emittance growth due to transverse wake fields. We report on first results from wake field monitor tests in an X-band structure, with a probe beam at the CLIC Test Facility. The monitors are currently installed in the CLIC Two-Beam Module. In order to fully demonstrate the feasibility of using wakefield monitors for CLIC, the precision of the monitors must be verified using a probe beam while simultaneously filling the structure with high power rf used to drive the accelerating mode. We outline plans to perform such a demonstration in the CLIC Test Facility.
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MOPTY064	Compensation Strategies for Ramping Waveform of TPS Booster Synchrotron Main Power Supplies	power-supply, booster, controls, quadrupole	1088
	P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, K.-B. Liu, B.S. Wang, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Booster synchrotron for the Taiwan photon source project which is a 3 GeV synchrotron light source constructed at NSRRC is in commissioning. The booster is designed to ramp electron beams from 150 MeV to 3 GeV in 3 Hz therefore the large main power supplies have features of waveform play with trigger functionalities to enable electron beams ramp from 150 MeV to 3 GeV in 3 Hz. However, due to limited bandwidth of power supplies, different magnet loading will result in quite different phase lag for dipoles and four quadrupoles families. To improve tracking error between quadrupole to dipole readings, several strategies are developed and will be summarized in this report.
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MOPTY069	Control Interface and Functionality of TPS Booster Power Supply	power-supply, booster, controls, quadrupole	1094
	C.Y. Wu, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, D. Lee, C.Y. Liao NSRRC, Hsinchu, Taiwan
	The TPS booster is a synchrotron with injection energy at 150 MeV and extraction energy at 3 GeV in 3 Hz. Booster main power supplies consist of one dipole power supply with maximum current 1200 Ampere and four quadrupole family power supplies with maximum current of 120/150 Ampere. The small power supply for booster corrector and sextupole is a low noise switching power supply with ± 10 Ampere current range. The TPS booster control environment is based on EPICS framework to support rich functionalities including power supply control, waveform management, operation supports, and so on. All power supplies support DC mode and 3 Hz ramping mode operation for TPS booster commissioning and operation. Efforts on control interface and functionality for TPS booster power supply will be summarizes.
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MOPTY075	Vibration Measurement of the Magnets in the Storage Ring of TPS	quadrupole, storage-ring, ground-motion, data-acquisition	1112
	C.H. Huang, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, D. Lee, C.Y. Liao NSRRC, Hsinchu, Taiwan
	Taiwan photon source is a 3rd generation synchrotron light source which is in beam commissioning at NSRRC. Orbit stability within 100 nm range is essential for such a small emittance light source. Technical noise from the vacuum pumps, water flow, etc. will cause the vibration of quadrupoles and deleterious orbit stability. In order to investigate the magnitude of vibration in the magnets of the storage ring, the vibration spectra of the lattice quadruples; the coherence between the magnets, girders and ground will be systematic investigated in this report.
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MOPWI001	First Results From Beam Tests of the CLIC Drive Beam Phase Feedforward Prototype at CTF3	kicker, hardware, optics, operation	1139
	J. Roberts, P. Burrows, G.B. Christian, C. Perry JAI, Oxford, United Kingdom A. Andersson, R. Corsini, P.K. Skowroński CERN, Geneva, Switzerland A. Ghigo, F. Marcellini INFN/LNF, Frascati (Roma), Italy
	Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu-CARD, grant agreement no. 227579. In the CLIC two beam acceleration scheme 100 MV/m normal conducting cavities are fed with RF power extracted from a secondary high power but low energy drive beam. To ensure the efficiency and luminosity performance of CLIC the phase synchronisation between the high energy main beam and the drive beam must be maintained to within 0.2 degrees of 12 GHz. To reduce the drive beam phase jitter to this level a low-latency drive beam phase feedforward correction with bandwidth above 17.5 MHz is required. A prototype of this system has been installed at the CLIC test facility CTF3 to prove its feasibility, in particular the challenges of high bandwidth, high power and low latency hardware. The final commissioning and first results from operation of the complete phase feedforward system are presented here.
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MOPWI002	Bunch Length Measurements using Synchrotron Light Monitor	linac, emittance, synchrotron, injection	1143
	M.M. Ali, M.G. Tiefenback JLab, Newport News, Virginia, USA
	The bunch length is measured at CEBAF using an invasive technique. The technique depends on applying an energy chirp for the electron bunch and imaging it through a dispersive region. The measurements are taken through Arc1 and Arc2 at CEBAF. The fundamental equations, procedure and the latest results are given.
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TUAD1	Magnet Design and Control of Field Quality for TPS Booster and Storage Rings	quadrupole, sextupole, vacuum, multipole	1370
	J.C. Jan, C.H. Chang, C.-T. Chen, H.H. Chen, Y.L. Chu, M.-H. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin, G.-H. Luo, I.C. Sheng, C.S. Yang, Y.T. Yu NSRRC, Hsinchu, Taiwan
	High-quality and very demanding magnets were designed, fabricated, field quality controlled and installed in the Taiwan Photon Source (TPS). The Storage Ring (SR) lattice is based on double-bend achromat structure with 1.6 nm-rad emittance and slight dispersion in straight sections. The fabrication and field measurement of these magnets were completed in Oct. 2013. The first synchrotron light from TPS storage ring, without applying any corrector at 3 GeV, was observed on Dec. 31, 2014. It indicates that the profile precision and field quality of magnets, and girders alignment reach world class standard. The integral multipoles components of the 240 SR quadrupole and 168 SR sextupole magnets conform to strict specifications. The maximum offset of measured mechanical center in magnets is better than 0.01 mm after feet shimming. The magnetic center offset of the magnets is within 0.02 mm inspected by rotating-coil method. The magnets’ field quality of booster’s pure quadrupole and combined-function quadrupole were accepted according to the errors specifications from beam dynamics and also in the beam commissioning. A permeability study of vacuum chamber was implemented during the booster ring hardware testing. The magnetic field of magnets is distorted by the permeability of vacuum chamber. Study of multipole errors due to magnetized vacuum chamber inside the magnet will be discussed.
	Slides TUAD1 [2.698 MB]
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TUBD3	Effects of Accelerating Structures on On-line DFS in the Main Linac of CLIC	wakefield, emittance, linac, simulation	1387
	J. Pfingstner, E. Adli University of Oslo, Oslo, Norway D. Schulte CERN, Geneva, Switzerland
	Long-term ground motion will create significant dispersion in the time-scale of hours in the main linac of CLIC. To preserve the emittance to an acceptable level, a dispersion correction with on-line dispersion-free steering (DFS) is inevitable. For this on-line technique, the dispersion has to be measured using beam energy variations of only about one per mil in order to not disturb the operation of the accelerator. For such small energy variations, the interaction of the particle beam and the accelerating structures creates large enough additional signals components in the measured dispersion to cause the dispersion correction to not work properly anymore. In this paper, the additional signals are described and their effect on the DFS algorithm is analysed. Finally, methods for the mitigation of the deteriorating signal components are presented and studied via simulations.
	Slides TUBD3 [1.697 MB]
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TUPWA002	Layout Options for the AXXS Injector and XFEL	linac, storage-ring, FEL, lattice	1394
	M.J. Boland, Y.E. Tan, D. Zhu SLSA, Clayton, Australia
	A new injector is being planned for the Australian Synchrotron that is designed to feed both an upgraded storage ring and an XFEL. The desire to fit the AXXS project on the same site as the existing light source presents several layout difficulties. Several options are studied and simulations are performed to check the impact each choice has on the beam performance.
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TUPWA006	SIRIUS ACCELERATORS STATUS REPORT	storage-ring, booster, vacuum, quadrupole	1403
	A.R.D. Rodrigues, F.C. Arroyo, O.R. Bagnato, J.F. Citadini, R.H.A. Farias, J.G.R.S. Franco, L. Liu, S.R. Marques, R.T. Neuenschwander, C. Rodrigues, R.M. Seraphim, O.H.V. Silva LNLS, Campinas, Brazil
	Sirius is a 3 GeV synchrotron light source that is being built by the Brazilian Synchrotron Light Laboratory (LNLS). The electron storage ring is based on a modified 5BA cell to achieve a bare lattice emittance of 0.27 nm.rad in a 518 m circumference ring that contains 20 straight sections of alternating 6 and 7 meters in length. The 5BA cell accommodates a thin permanent magnet high field (2 T) dipole in the center of the middle bend producing hard X-ray radiation (εc=12 keV) with a modest contribution to the total energy loss. In this paper we discuss the main achievements and issues for Sirius accelerators. Developments in beamlines are not discussed here.
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TUPWA052	Elettra 2.0 - The Next Machine	lattice, quadrupole, emittance, dynamic-aperture	1532
	E. Karantzoulis Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	A next generation light source (ULS) to replace Elettra, the third generation Italian light source, is presented and discussed
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TUPJE041	Progress on a Compact Accelerator Design for a Compton Light Source	gun, linac, space-charge, solenoid	1706
	K.E. Deitrick, J.R. Delayen, B.R.P. Gamage, G.A. Krafft, T. Satogata ODU, Norfolk, Virginia, USA
	A compact Compton light source using an electron linear accelerator is in design at the Center for Accelerator Science at Old Dominion University and Jefferson Lab. We report on the current design, including beam properties through the entire system based on a full end-to-end simulation, compare current specifications to design goals, and target areas for improvement.
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TUPJE048	Orbit Correction and Stability Studies for Ultra-Low Emittance Storage Rings	photon, emittance, simulation, storage-ring	1728
	M. Böge, M. Aiba, A. Streun PSI, Villigen PSI, Switzerland
	Ultra-low emittance storage rings exhibit extremely strong focusing and sextupolar chromaticity corrections. The therefore mandatory excellent centering of the closed orbit in the small aperture magnets is a challenging task and necessitates a proper beam diagnostics and correction layout. Correction and stability studies for a possible ultra-low emittance upgrade of the Swiss Light Source are presented.
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TUPJE067	Status of the APS Upgrade Project	brightness, photon, lattice, emittance	1791
	S. Henderson ANL, Argonne, Ilinois, USA
	Funding: Work supported by U.S. Dept. of Energy, Office of Science, under Contract No. DE-AC02-06CH11357 A concept for an upgrade to the Advanced Photon Source based on a multi-bend achromat lattice is being developed at Argonne National Laboratory. An MBA upgrade to the APS will reduce the horizontal emittance by a factor of ~50. Coupled with superconducting undulators, the APS-U brightness will be two to three orders of magnitude beyond that which is available today at the APS.
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TUPJE068	Development and Performance of 1.1-m Long Superconducting Undulator at the Advanced Photon Source	undulator, photon, operation, storage-ring	1794
	Y. Ivanyushenkov, C.L. Doose, J.F. Fuerst, E. Gluskin, K.C. Harkay, Q.B. Hasse, M. Kasa, Y. Shiroyanagi, D. Skiadopoulos, E. Trakhtenberg ANL, Argonne, Ilinois, USA
	Funding: Work supported by U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. Development of superconducting undulators continues at the Advanced Photon Source (APS). The second superconducting undulator, SCU1, has been built and installed in the storage ring of the APS. This undulator has a 1.1-m long superconducting magnet and utilizes an improved version of the cryostat of the first superconducting undulator, SCU0. The results of the cold test of the SCU1, and its performance in the APS storage ring are presented in this paper.
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TUPJE071	Alternate Lattice Design for Advanced Photon Source Multi-Bend Achromat Upgrade	lattice, injection, quadrupole, accumulation	1803
	Y. Sun, M. Borland ANL, Argonne, Ilinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. A 67-pm hybrid-seven-bend achromat (H7BA) lattice is proposed for a future Advanced Photon Source (APS) multi-bend-achromat (MBA) upgrade. This lattice requires use of a swap-out (on-axis) injection scheme. Alternate lattice design work has also been performed to achieve better beam dynamics performance than the nominal APS MBA lattice, in order to allow beam accumulation. One of such alternate H7BA lattice designs, which still targets a very low emittance of 76 pm, is discussed in this paper. With these lattices, existing APS injector complex can be employed without the requirement of a very high charge operation. Studies show that an emittance below 76 pm can be achieved with the employment of reverse bends in an alternate lattice. We discuss the predicted performance and requirements for these lattices and compare them to the nominal lattice.
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TUPJE080	First Beam and High-Gradient Cryomodule Commissioning Results of the Advanced Superconducting Test Accelerator at Fermilab	cavity, cryomodule, accelerating-gradient, diagnostics	1831
	D.J. Crawford, C.M. Baffes, D.R. Broemmelsiek, K. Carlson, B.E. Chase, E. Cullerton, J.S. Diamond, N. Eddy, D.R. Edstrom, E.R. Harms, A. Hocker, C.D. Joe, A.L. Klebaner, M.J. Kucera, J.R. Leibfritz, A.H. Lumpkin, J.N. Makara, S. Nagaitsev, O.A. Nezhevenko, D.J. Nicklaus, L.E. Nobrega, P. Piot, P.S. Prieto, J. Reid, J. Ruan, J.K. Santucci, W.M. Soyars, G. Stancari, D. Sun, R.M. Thurman-Keup, A. Valishev, A. Warner, S.J. Wesseln Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. The advanced superconducting test accelerator at Fermilab has accelerated electrons to 20 MeV and, separately, the International Linear Collider (ILC) style 8-cavity cryomodule has achieved the ILC performance milestone of 31.5 MV/m per cavity. When fully completed, the accelerator will consist of a photoinjector, one ILC-type cryomodule, multiple accelerator R&D beamlines, and a downstream beamline to inject 300 MeV electrons into the Integrable Optics Test Accelerator (IOTA). We report on the results of first beam, the achievement of our cryomodule to ILC gradient specifications, and near-term future plans for the facility.
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TUPMA025	X-Band RF Photoinjector for Laser Compton X-Ray and Gamma-Ray Sources	laser, electron, emittance, gun	1891
	R.A. Marsh, G.G. Anderson, S.G. Anderson, C.P.J. Barty, D.J. Gibson LLNL, Livermore, California, USA
	Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Extremely bright narrow bandwidth gamma-ray sources are expanding the application of accelerator technology and light sources in new directions. An X-band test station has been commissioned at LLNL to develop multi-bunch electron beams. This multi-bunch mode will have stringent requirements for the electron bunch properties including low emittance and energy spread, but across multiple bunches. The test station is a unique facility featuring a 200 MV/m 5.59 cell X-band photogun powered by a SLAC XL4 klystron driven by a Scandinova solid-state modulator. This paper focuses on its current status including the generation and initial characterization of first electron beam. Design and installation of the inverse-Compton scattering interaction region and upgrade paths will be discussed along with future applications.
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TUPMA033	A Bunch Compression Method for Free Electron Lasers that Avoids Parasitic Compressions	electron, laser, FEL, acceleration	1907
	S.V. Benson, D. Douglas, C. Tennant, F.G. Wilson JLab, Newport News, Virginia, USA D.C. Nguyen LANL, Los Alamos, New Mexico, USA
	Funding: This work was supported by U.S. DOE Contract No. DE-AC05-84-ER40150, the Air Force Office of Scientific Research, DOE Basic Energy Sciences. Virtually all existing high energy (>few MeV) linac-driven FELs compress the electron bunch length though the use of off-crest acceleration on the rising side of the RF waveform followed by transport through a magnetic chicane. This approach has at least three flaws: 1) it is difficult to correct aberrations- particularly RF curvature, 2) rising side acceleration exacerbates space charge-induced distortion of the longitudinal phase space, and 3) all achromatic "negative compaction" compressors create parasitic compression during the final compression process, increasing the CSR-induced emittance growth. One can avoid these deficiencies by using acceleration on the falling side of the RF waveform and a compressor with M56>0. This approach offers multiple advantages: 1) It is readily achieved in beam lines supporting simple schemes for aberration compensation, 2) Longitudinal space charge (LSC)-induced phase space distortion tends, on the falling side of the RF waveform, to enhance the chirp, and 3) Compressors with M56>0 can be configured to avoid spurious over-compression. We will discuss this bunch compression scheme in detail and give results of a successful beam test in April 2012 using the JLab UV Demo FEL
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TUPMA037	Commissioning of the 123 MeV Injector for 12 GeV CEBAF	cryomodule, optics, operation, injection	1920
	Y.W. Wang, A.S. Hofler, R. Kazimi JLab, Newport News, Virginia, USA
	The injector energy needed to be raised from 67.5 MeV to 123 MeV to meet the energy requirement of the CEBAF 12 GeV upgrade. The ratio of the injector energy to the linac energy must remain 0.11284 at all times. Consequently, the injector was partially upgraded. The early injector, transport and acceleration from 130 keV to 6 MeV, is unchanged, but the downstream boost from 6 MeV to the final 123 MeV energy drove several changes. One of the two original CEBAF 25 MeV type cryomodules in the injector was upgraded to a 100 MeV capable one to provide more energy. Some trim magnets at the end of the injector were upgraded to compensate for the higher energy. The chicane region was expanded, and the full energy injector spectrometer was relocated to make room for the newly added Hall D line. Experience from the 6 GeV era indicated that the stray fields from the higher energy beam transport recombiners near the injection chicane adversely affect the injector orbit, so a study to understand and mitigate stray fields from the transport arc box supplies upgraded for 12 GeV led to shielding modifications for the beamline in the chicane region.
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TUPMA055	Analysis of Possible Beam Losses in the NSLS II Storage Ring	radiation, storage-ring, shielding, electron	1956
	S. Seletskiy, R.P. Fliller, W. Guo, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, W.H. Wahl, F.J. Willeke BNL, Upton, Long Island, New York, USA
	The NSLS-II accelerators are installed within radiation shielding walls that are designed to attenuate the radiation generated from an assumed beam loss power to a level of <0.5mrem/h at the outer surface of the bulk shield walls. Any operational losses greater than specified level are expected to be addressed by installing supplemental shielding near the loss point in order to attenuate the radiation outside the shield wall to the design level. In this paper we report the analysis of the electron beam mis-steering in the NSLS-II storage ring for the determination of supplementary shielding.
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TUPHA010	Design of the NSLS-II Top Off Safety System	storage-ring, interlocks, injection, operation	1986
	R.P. Fliller, L. Doom, G. Ganetis, C. Hetzel, P.K. Job, Y. Li, T.V. Shaftan, S.K. Sharma, O. Singh, G.M. Wang, Z. Xia BNL, Upton, Long Island, New York, USA
	The NSLS-II accelerators finished commissioning in the fall of 2014, with beamline commissioning underway. Part of the design for the NSLS-II is to operate in top off mode. The Top Off Safety System (TOSS) is presently under design. In this report we discuss the Top Off Safety System design and implementation, along with the necessary tracking results and radiological calculations.
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TUPTY001	Interaction Region for a 100 TeV Proton-Proton Collider	shielding, quadrupole, interaction-region, radiation	1996
	R. Martin, R. Tomás CERN, Geneva, Switzerland B. Dalena CEA/IRFU, Gif-sur-Yvette, France
	As part of its post-LHC high energy physics program, CERN is conducting a study for a new proton-proton collider, FCC-hh, running at center-of-mass energies of up to 100 TeV, pushing the energy frontier of fundamental physics to a new limit. At a circumference of 80-100 km, this machine is planned to use the same tunnel as FCC-ee, a proposed 90-350 GeV high luminosity electron-positron collider. This paper presents the design progress and technical challenges for the interaction region of FCC-hh.
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TUPTY012	Orbit Correction in CEPC	quadrupole, closed-orbit, factory, target	2022
	S. Bai, J. Gao, H. Geng IHEP, Beijing, People's Republic of China
	With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 10³⁴ cm^-2s^-1) is becoming more popular in the accelerator world. The CEPC project in China is one of them. To reduce the cost, pretzel scheme was considered in CEPC orbit design. The presence of every kind of errors and misalignments will destroy the pretzel orbit. In this paper, we correct the distorted pretzel orbit in the CEPC main ring using the dipole correctors and beam position monitors. The pretzel orbit was recovered and the maximum corrector strengths are got.
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TUPTY022	Alternative Optics Design of the CLIC Damping Rings with Variable Dipole Bends and High-field Wigglers	emittance, wiggler, damping, optics	2046
	P.S. Papadopoulou, F. Antoniou, Y. Papaphilippou CERN, Geneva, Switzerland
	The CLIC Damping Rings baseline design aims to reach an ultra-low horizontal normalised emittance of 500nm-rad at 2.86GeV, based on the combined effect of TME arc cells and high-field super-conducting damping wigglers, while keeping the ring as compact as possible. In this paper, an alternative design is described, based on TME cells with longitudinally variable bends and an optimized Nb3Sn high-field wiggler. The impact of these changes on ring optics parameters and the associated optimisation steps are detailed taking account the dominant effect of intrabeam scattering.
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TUPTY046	Impact of Beam Losses in the LHC Collimation Regions	collimation, simulation, proton, coupling	2116
	E. Skordis, R. Bruce, F. Cerutti, A. Ferrari, P.D. Hermes, A. Lechner, A. Mereghetti, P.G. Ortega, S. Redaelli, V. Vlachoudis CERN, Geneva, Switzerland
	The upgrade of the LHC energy and brightness, from the 2015 restart at close to design energy until the HL-LHC era with considerable hardware development and layout renewal, poses tight challenges in terms of machine protection. The collimation insertions and especially the one dedicated to betatron cleaning (IR7), where most of the beam halo is intercepted to spare from losses the cold sectors of the ring, will be subject to a significant increase of radiation load, whose leakage to the nearby dispersion suppressors must be kept sustainable. The past LHC run, while displaying a remarkable performance of the collimation system, offered the opportunity for a demanding benchmarking of the complex simulation chain describing the beam losses and the macroscopic effects of the induced particle showers, this way strengthening the confidence in the reliability of its predictions. This paper discusses the adopted calculation strategy and its evolution options, showing the accuracy achieved with respect to Beam Loss Monitor measurements in controlled loss scenarios. Expectations at design energy, including lifetime considerations concerning critical elements, will also be presented.
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TUPTY084	Update on the MEIC Electron Collider Ring Design	electron, collider, quadrupole, optics	2236
	F. Lin, Y.S. Derbenev, L. Harwood, A. Hutton, V.S. Morozov, F.C. Pilat, Y. Zhang JLab, Newport News, Virginia, USA Y. Cai, Y. Nosochkov, M.K. Sullivan, M.-H. Wang, U. Wienands SLAC, Menlo Park, California, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work also supported by the U.S. DOE Contract No. DE-AC02-76SF00515. The electron collider ring of the Medium-energy Electron-Ion Collider (MEIC) at Jefferson Lab is designed to accumulate and store a high-current polarized electron beam for collisions with an ion beam. We consider a design of the electron collider ring based on reusing PEP-II components, such as magnets, power supplies, vacuum system, etc. This has the potential to significantly reduce the cost and engineering effort needed to bring the project to fruition. This paper reports on an electron ring optics design considering the balance of PEP-II hardware parameters (such as dipole sagitta, magnet field strengths and acceptable synchrotron radiation power) and electron beam quality in terms of equilibrium emittances.
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TUPWI014	Design of a Superconducting Gantry for Protons	quadrupole, proton, lattice, target	2268
	C. Bonțoiu, I. Martel, J. Sanchez-Segovia University of Huelva, Huelva, Spain R. Berjillos, J.P.B. Perez TTI, Santander, Spain
	The last decade brought much interest in proton therapy within the medical and accelerator communities. Using normal conducting technology, the high-energy beams required can be handled only with large and heavy magnets which causes prohibitive costs. While lattice design work on a superconducting gantry has been carried out for a decade there is yet no practical implementation. The University of Huelva in collaboration with the Andalusian Foundation for Health Research (FABIS) is currently involved in developing and assembling a prototype for a compact superconducting proton gantry. Magnet design and performance is described along with beam dynamics results for the main gantry arcs and for the final spot scanning system using realistic magnetic field maps thoroughly.
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TUPWI016	Gantry 3: Further Development of the PSI PROSCAN Proton Therapy Facility	controls, proton, cyclotron, coupling	2275
	A. Koschik PSI, Villigen, Villigen, Switzerland C. Bula, J.P. Duppich, A. Gerbershagen, M. Grossmann, J.M. Schippers, J. Welte PSI, Villigen, Switzerland
	PSI and its Center for Proton Therapy (CPT) is extending its research capabilities in the field of proton therapy and pencil beam scanning technology. Gantry 3 will be an additional treatment room at the PROSCAN facility at PSI, Villigen, Switzerland. It will feature a 360 degree scanning Gantry delivered by Varian Medical Systems. The Gantry design is based on Varian technology, which will be combined with advanced PSI active scanning technology. The further development of fast energy switching as well as precise spot and continuous line scanning irradiation modes are main research topics at the PROSCAN facility. A major challenge with Gantry 3 is the link of the existing PSI PROSCAN system with the Varian PROBEAM system, while retaining the system integrity and high performance level. Additionally, Gantry 3 will be installed and commissioned while keeping the other treatment rooms (Gantry 1, Gantry 2, Optis 2) in full operation. The current development and project status is presented.
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TUPWI031	Status of the MEIC Ion Collider Ring Design	ion, electron, collider, optics	2307
	V.S. Morozov, Y.S. Derbenev, L. Harwood, A. Hutton, F. Lin, F.C. Pilat, Y. Zhang JLab, Newport News, Virginia, USA Y. Cai, Y. Nosochkov, M.K. Sullivan, M.-H. Wang, U. Wienands SLAC, Menlo Park, California, USA J. Gerity, T.L. Mann, P.M. McIntyre, N. Pogue, A. Sattarov Texas A&M University, College Station, Texas, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported in part by the US DOE Contract No. DE-AC02-76SF00515. We present an update on the design of the ion collider ring of the Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab. The design is based on the use of super-ferric magnets. It provides the necessary momentum range of 8 to 100 GeV/c for protons and ions, matches the electron collider ring design using PEP-II components, fits readily on the JLab site, offers a straightforward path for a future full-energy upgrade by replacing the magnets with higher-field ones in the same tunnel, and is more cost effective than using presently available current-dominated super-conducting magnets. We describe complete ion collider optics including an independently-designed modular detector region.
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TUPWI045	Consequences of Bounds on Longitudinal Emittance Growth for the Design of Recirculating Linear Accelerators	linac, emittance, quadrupole, collider	2350
	J.S. Berg BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Recirculating linear accelerators (RLAs) are a cost-effective method for the acceleration of muons for a muon collider in energy ranges from a couple GeV to a few 10s of GeV. Muon beams generally have longitudinal emittances that are large for the RF frequency that is used, and it is important to limit the growth of that longitudinal emittance. This has particular consequences for the arc design of the RLAs. I estimate the longitudinal emittance growth in an RLA arising from the RF nonlinearity. Given an emittance growth limitation and other design parameters, one can then compute the maximum momentum compaction in the arcs. I describe how to obtain an approximate arc design satisfying these requirements based on the deisgn in Bogacz (2005). Longitudinal dynamics also determine the energy spread in the beam, and this has consequences on the transverse phase advance in the linac. This in turn has consequences for the arc design due to the need to match beta functions. I combine these considerations to discuss design parameters for the acceleration of muons for a collider in an RLA from 5 to 63 GeV. Bogacz, S. A. 2005. Low energy stages - 'dogbone' muon RLA. Nucl. Phys. B (Proc. Supp.) 149:309-312.
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TUPWI054	9-D Polarized Proton Transport in the MEIC "Figure-8" Collider Ring - First Steps	lattice, polarization, quadrupole, collider	2375
	F. Méot BNL, Upton, Long Island, New York, USA V.S. Morozov JLab, Newport News, Virginia, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Spin tracking studies in the MEIC figure-8 collider ion ring are presented, based on a preliminary design of the lattice. They provide numerical illustrations of some of the aspects of the figure-8 concept, including spin-rotator based spin control, and lay out the path towards complete spin tracking simulations.
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WEXB1	Coherent Synchrotron Radiation in Energy Recovery Linacs	FEL, electron, experiment, linac	2387
	C.C. Hall, S. Biedron, A.L. Edelen, S.V. Milton CSU, Fort Collins, Colorado, USA S.V. Benson, D. Douglas, R. Li, C. Tennant JLab, Newport News, Virginia, USA B.E. Carlsten LANL, Los Alamos, New Mexico, USA
	Collective beam effects, including coherent synchrotron radiation (CSR), have been studied on free-electron lasers (FELs). Here we will discuss a particular case of the CSR effects, that in energy-recovery linacs (ERLs). Special consideration is given to these machines because of their high average beam power and the architecture of the machine for energy recovery forces extreme bends. A recent study conducted on the JLab IR FEL looked at how CSR impacts both average energy and the energy spectrum of the beam. Such studies are important, both broadly, to the understanding of CSR and more specifically for a number of proposed ERL projects. A few proposed examples include the MEIC bunched beam cooler ERL design and ERL FELs for potential lithography purposes that would operate in the EUV range.
	Slides WEXB1 [16.383 MB]
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WEAB2	Beam and Spin Dynamics for Storage Ring Based EDM Search	simulation, storage-ring, resonance, experiment	2454
	A. Lehrach FZJ, Jülich, Germany
	Funding: On behalf of the JEDI collaboration and JARA-FAME (Jülich Aachen Research Alliance) Permanent EDMs (electric dipole moment) of fundamental particles violate both time invariance T and parity P. Assuming the CPT theorem this implies CP violation. The Standard Model (SM) predicts non-vanishing EDMs, their magnitudes, however, are expected to be unobservably small with current techniques. Hence, the discovery of a non-zero EDM would be a signal for “new physics”. As a first step towards EDM searches of charged particles in storage rings, R&D work at the Cooler Synchrotron COSY is pursued. On a longer time scale, the design and construction of a dedicated storage ring will be carried out. Spin-tracking simulations are absolutely crucial to explore the feasibility of the planned storage ring EDM experiments and to investigate systematic limitations. For a detailed study during the storage and buildup of the EDM signal, one needs to track a large sample of particles for billions of turns. Benchmarking experiments are performed at the Cooler Synchrotron COSY to check and to further improve the simulation tools and prototype accelerator components are tested. Finally, the layout of a dedicated storage ring has to be optimized by a full simulation of spin motion.
	Slides WEAB2 [1.459 MB]
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WEBB2	First Considerations on Beam Optics and Lattice Design for the Future Hadron-Hadron Collider FCC-hh	quadrupole, optics, injection, collider	2466
	B. Dalena CEA/IRFU, Gif-sur-Yvette, France R. Alemany-Fernández, B.J. Holzer, D. Schulte CERN, Geneva, Switzerland A. Chancé, J. Payet CEA, Gif-sur-Yvette, France
	The main emphasis of the Future Circular Collider study is the design of a 100~TeV proton-proton collider in a new tunnel of about 100 km circumference. This paper presents the first optics design of the future hadron collider (FCC-hh). The basic layout follows a quasi-circular geometry ‘‘quasi racetrack'' with 8 arcs and 8 straight sections, four of which designed as interaction points. Assuming 16~T dipole magnets, a first version of the ring geometry and magnet lattice is presented, including the optics of the foreseen high luminosity regions and of the other straight sections dedicated to the installation of injection/extraction lines, beam dump etc., and an arc structure with optimized dipole fill factor to reach the target center-of-mass energy of 100~TeV.
	Slides WEBB2 [4.622 MB]
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WEPWA013	A Transport Beamline Solution for Laser-Driven Proton Beams	laser, proton, simulation, quadrupole	2515
	A. Tramontana, G. Candiano, G.A.P. Cirrone, M. Costa, G. Cuttone, G. Gallo, R. Leanza, R. Manna, V. Marchese, G. Milluzzo, G. Petringa, D. Rizzo, F. Romano, S. Salamone, F. Schillaci, V. Scuderi INFN/LNS, Catania, Italy M. Maggiore INFN/LNL, Legnaro (PD), Italy V. Scuderi ELI-BEAMS, Prague, Czech Republic
	Laser-target interaction represents a very promising field in several potential applications, from nuclear physics to medicine. On the other hand optically accelerated particle beams are characterized by some extreme features, often not suitable for several applications, as an high peak current, a poor shot-to-shot reproducibility and a wide energy and angular distribution. Therefore many efforts are currently ongoing for the development of specific beam transport devices in order to obtain controlled and reproducible output beams. In this framework, this work want to report about a transport beamline solution dedicated to laser-driven beams and made of two main sections: a quadrupole-focusing device and an energy selector system. A test beam-line consisting of prototypes has been realised at INFN-LNS (National Institute of Physics-South National Laboratories, Ct, I) and partially tested with conventional accelerated proton beams. Moreover, some of these prototypes have been already tested with laser-driven beams.\ Several simulations have been also performed using the Geant4 Monte Carlo toolkit, in order to best exploit the beamline potentiality. Preliminary simulations of a transported beamline to select 5 MeV and 24 MeV proton beams are here reported.
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WEPWA034	High-charge-short-bunch Operation Possibility at Argonne Wakefield Accelerator Facility	emittance, linac, wakefield, simulation	2572
	G. Ha, M.-H. Cho, W. Namkung POSTECH, Pohang, Kyungbuk, Republic of Korea W. Gai, G. Ha, K.-J. Kim, J.G. Power ANL, Argonne, Illinois, USA
	Originally the drive beam line at Argonne Wakefield Accelerator (AWA) Facility was designed to generate the high charge bunch train. However, we recently installed the double dog-leg type emittance exchange beam line which have two identical dog-leg structures. With this beam line, it is possible to compress the bunch by introducing the chicane or using single dog-leg. Simulation studies have been carried out to confirm the minimum bunch length for each charge and the emittance growth by the coherent synchrotron radiation. We present GPT simulation results to show high-charge-short-bunch operation possibility at AWA facility.
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WEPWA035	Initial EEX-based Bunch Shaping Experiment Results at the Argonne Wakefield Accelerator Facility	experiment, simulation, cavity, emittance	2575
	G. Ha, M.-H. Cho, W. Namkung POSTECH, Pohang, Kyungbuk, Republic of Korea M.E. Conde, D.S. Doran, W. Gai, G. Ha, C.-J. Jing, K.-J. Kim, W. Liu, J.G. Power, Y.-E. Sun, C. Whiteford, E.E. Wisniewski, A. Zholents ANL, Argonne, Illinois, USA C.-J. Jing Euclid TechLabs, LLC, Solon, Ohio, USA P. Piot Fermilab, Batavia, Illinois, USA
	Funding: This work is partly supported by POSTECH BK²¹⁺ and Argonne National Laboratory A program is under development at Argonne National Laboratory to use an emittance exchange (EEX) beamline to perform longitudinal bunch shaping (LBS). The double dog-leg EEX beamline was recently installed at the Argonne Wakefield Accelerator (AWA) and the goals of the proof-of-principle experiment are to demonstrate LBS and characterize its deformations from the ideal shape due to higher-order and collective effects. The LBS beamline at the AWA consists of insert-able transverse masks mounted on an actuator and four quadrupoles (to manipulate the transverse phase space) before the EEX beamline, which consists of two identical dog-legs and a deflecting cavity. The mask and input beam parameters are varied during the experiment to explore the shaping capability and clarify the deformation sources and their mitigation. Progress on the commissioning of the LBS beamline, initial experimental data and benchmarks to GPT simulations will be presented.
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WEPWA039	The AWAKE Electron Primary Beam Line	electron, proton, plasma, wakefield	2584
	J.S. Schmidt, J. Bauche, B. Biskup, C. Bracco, E. Bravin, S. Döbert, M.A. Fraser, B. Goddard, E. Gschwendtner, L.K. Jensen, O.R. Jones, S. Mazzoni, M. Meddahi, A.V. Petrenko, F.M. Velotti, A.S. Vorozhtsov CERN, Geneva, Switzerland U. Dorda DESY, Hamburg, Germany L. Merminga, V.A. Verzilov TRIUMF, Vancouver, Canada P. Muggli MPI, Muenchen, Germany
	The AWAKE project at CERN is planned to study proton driven plasma wakefield acceleration. The proton beam from the SPS will be used in order to drive wakefields in a 10 m long Rb plasma cell. In the first phase of this experiment, scheduled in 2016, the self-modulation of the proton beam in the plasma will be studied in detail, while in the second phase an external electron beam will be injected into the plasma wakefield to probe the acceleration process. The installation of AWAKE in the former CNGS experimental area and the required optics flexibility define the tight boundary conditions to be fulfilled by the electron beam line design. The transport of low energy (10-20 MeV) bunches of 1.25·10⁹ electrons and the synchronous copropagation with much higher intensity proton bunches (3E11) determines several technological and operational challenges for the magnets and the beam diagnostics. The current status of the electron line layout and the associated equipments are presented in this paper.
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WEPWA045	Development of a Spectrometer for Proton Driven Plasma Wakefield Accelerated Electrons at AWAKE	plasma, electron, proton, simulation	2601
	L.C. Deacon, S. Jolly, F. Keeble, M. Wing UCL, London, United Kingdom B. Biskup Czech Technical University, Prague 6, Czech Republic B. Biskup, E. Bravin, A.V. Petrenko CERN, Geneva, Switzerland M. Wing DESY, Hamburg, Germany M. Wing University of Hamburg, Hamburg, Germany
	The AWAKE experiment is to be constructed at the CERN Neutrinos to Gran Sasso facility (CNGS). This will be the first experiment to demonstrate proton-driven plasma wakefield acceleration. The 400 GeV proton beam from the CERN SPS will excite a wakefield in a plasma cell several metres in length. To observe the plasma wakefield, electrons of 10–20 MeV will be injected into the wakefield following the head of the proton beam. Simulations indicate that electrons will be accelerated to GeV energies by the plasma wakefield. The AWAKE spectrometer is intended to measure both the peak energy and energy spread of these accelerated electrons. Improvements to the baseline design are presented, with an alternative dipole magnet and quadrupole focussing, with the resulting energy resolution calculated for various scenarios. The signal to background ratio due to the interaction of the SPS protons with upstream beam line components is calculated, and CCD camera location, shielding and light transport are considered.
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WEPJE006	Dielectric Wakefield Accelerator Experiments at ATF	wakefield, experiment, electron, controls	2681
	D.Y. Shchegolkov, E.I. Simakov LANL, Los Alamos, New Mexico, USA S.P. Antipov Euclid TechLabs, LLC, Solon, Ohio, USA M.G. Fedurin BNL, Upton, Long Island, New York, USA
	Funding: This work is supported by the U.S. Department of Energy through the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory. Dielectric wakefield acceleration (DWA) presents us with means to achieve the accelerating gradient high above the limits of conventional accelerators. In a typical DWA scheme a higher energy lower charge main bunch is accelerated in the wakefield produced by a preceding lower energy higher charge drive bunch inside of a hollow metal-encapsulated dielectric tube. To make use of as much energy of the drive bunch as possible, it is highly important that all parts of it decelerate uniformly. Close to uniform drive bunch deceleration can be achieved if its current is properly shaped.* At Accelerator Test Facility (ATF) at BNL we shaped the current of a chirped electron beam with an adjustable mask placed inside of the highly dispersive region in the magnetic dogleg. We passed the shaped beam current through a quartz tube and observed the beam particles’ energy modulation at the tube’s output with a spectrometer. By tuning the mask we were able to control the beam energy modulation and thus the wakefield profile in the tube. * B. Jiang, C. Jing, P. Schoessow, J. Power, and W. Gai, PRSTAB 15, 011301 (2012).
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WEPJE007	Simulation Studies of BBU Suppression Methods and Acceptable Tolerances in Dielectric Wakefield Accelerators	wakefield, quadrupole, lattice, simulation	2685
	D.Y. Shchegolkov, E.I. Simakov LANL, Los Alamos, New Mexico, USA A. Zholents ANL, Argonne, Illinois, USA
	Funding: This work is supported by the U.S. Department of Energy through the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory. The advantage of dielectric wakefield accelerators (DWAs) is the ability to achieve accelerating gradients well above the limits of conventional accelerators. However DWAs will also produce high transverse wakefields if the beam propagates off-center, which grow even faster than the accelerating gradient when the width of the beam channel is decreased.* It is highly important to suppress single beam breakup (BBU) instability in order for the beam to propagate long enough so that a reasonable amount of energy (e.g., 80%) from the drive bunch is extracted. In addition bending of the dielectric channel has a similar effect to off-center steering of the beam with the required tolerances on the channel straightness typically in a few micron range. For both rectangular and circular dielectric lined waveguides we use a FODO lattice with a tapered strength for suppression of BBU. We impose initial energy chirp on the drive beam to make use of the BNS damping. We change rectangular waveguide orientation by 90 degrees with a small step to make use of the quadrupole wakefield focusing. These and other techniques and tolerance requirements are discussed and simulation results are presented in this presentation. * C. Li, W. Gai, C. Jing, J.G. Power, C.X. Tang, and A. Zholents, High gradient limits due to single bunch beam breakup in a collinear dielectric wakefield accelerator, PRSTAB 17, 091302 (2014).
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WEPMA003	Vacuum System Design for the Sirius Storage Ring	vacuum, radiation, storage-ring, synchrotron	2744
	R.M. Seraphim, O.R. Bagnato, R.O. Ferraz, H.G. Filho, G.R. Gomes, M. Nardin, R.F. Oliveira, B.M. Ramos, A.R.D. Rodrigues, M.B. Silva, T.M. da Rocha LNLS, Campinas, Brazil
	Sirius is a 3 GeV 4th-generation light source under construction by the Brazilian Synchrotron Light Laboratory (LNLS). Sirius will have a low emittance storage ring, 0.28 nm-rad, based on 20 cells of a highly compact lattice – 5-bend achromat (5BA). This lattice concept leaves very little space for components and therefore requires narrow vacuum chambers with tight mechanical tolerances. Most of the storage ring vacuum chambers will be made of OFS copper and have a circular cross section with inner diameter of 24 mm and a wall thickness of 1 mm. The unused synchrotron radiation will be distributed along the water cooled walls of the chambers. Due to the small conductance of the chambers, the vacuum pumping will be based on distributed concept and then non-evaporable getter (NEG) coating will be extensively used, with more than 95% of the chambers being coated. In this paper, we present an overview of the storage ring vacuum system and the main vacuum chambers fabrication developments.
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WEPMA015	Water-cooled Thin Walled Beam Pipes of the Fast Ramping Storage Ring ELSA	radiation, synchrotron, electron, synchrotron-radiation	2780
	P. Hänisch, W. Hillert, B. Neff ELSA, Bonn, Germany
	At the Electron Stretcher Facility ELSA of Bonn University thin walled beam pipes are in use to reduce eddy current loss to a minimum. The operation of the accelerator places high demands on the beam pipes like static stress because of the inner vacuum and additional one-sided thermal stress caused by synchrotron radiation. A first generation of thin walled beam pipes had been developed and manufactured during the construction of the stretcher ring in 1985. These pipes were successfully in operating stage the following ten years. The beam pipes had a wall thickness of 0.3mm, a length of 3m, and a bending radius of ca. 10.5m. Special pipes with a sideway branch for synchrotron radiation experiments have been manufactured in the same assembly dimension. In the course of an intensity upgrade, a second generation of beam pipes has been developed in 1995. To reduce the thermal stress caused by the synchrotron radiation an internal water cooling was mounted. In this contribution the design and manufacturing principles of the thin walled beam pipes with water cooling are presented.
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WEPMA019	Status of the Super-FRS Magnet Devlopment for Fair	quadrupole, status, cryogenics, octupole	2792
	H. Müller, E.S. Fischer, H. Leibrock, P. Schnizer, M. Winkler GSI, Darmstadt, Germany J.-E. Munoz-Garcia, L. Quettier CEA/IRFU, Gif-sur-Yvette, France L. Serio CERN, Geneva, Switzerland
	The Super FRS is a two-stage in flight separator to be built next to the site of GSI, Darmstadt, Germany as part of FAIR (Facility for Anti-proton and Ion Research). Its purpose is to create and separate rare isotope beams and to enable the mass measurement also for very short lived nuclei. Due to its three branches a wide variety of experiments can be carried out in frame of the NUSTAR collaboration. Due to the large acceptance needed, the magnets of the Super-FRS have to have a large aperture and therefore only a superconducting solution is feasible. A superferric design with superconducting coils was chosen in which the magnetic field is shaped by an iron yoke. We will present the actual design status of the dipole- and multipole magnets as well as the status of the development of the dedicated test facility at CERN.
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WEPMA020	SIS100 Dipole Field Harmonics and Dynamic Aperture Calculations	multipole, quadrupole, simulation, synchrotron	2795
	C. Omet, E.S. Fischer, G. Franchetti, V. Kornilov, A. Mierau, C. Roux, P. Schnizer, D. Schäfer, S. Sorge, P.J. Spiller, K. Sugita GSI, Darmstadt, Germany
	During the acceptance test of the First of Series (FoS) SIS100 super-ferric dipole, detailed field measurements have been done. The harmonic coefficients have been extracted from these and dynamic aperture simulations have been done which are presented here. Furthermore, geometric precision measurement tools for the magnet have been developed to track down the field errors to geometric errors. Finally, mitigation actions have been taken to reduce these errors during manufacturing to ensure the design beam survival rate in SIS100.
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WEPMA023	Advanced Multipoles and Appropriated Measurement Tools for Field Characterization of SIS100 Magnets	multipole, vacuum, superconducting-magnet, ion	2805
	P. Schnizer, E.S. Fischer, A. Gottsmann, F. Kaether, A. Mierau, H.G. Weiss GSI, Darmstadt, Germany B. Schnizer TUG/ITP, Graz, Austria
	The heavy ion synchrotron SIS100 utilises fast ramped superconducting magnets. Describing and measuring these magnets requires advanced multipoles next to well adapted measurement techniques. We cover briefly the required theory adapted to the measurements, show which designs were available and which decisions had to be taken for measuring curved superconducting magnets. The series of SIS100 dipole magnets is going to be produced. These magnets will be measured at GSI. We present the foreseen field measurement procedure, outline the currently ongoing tests and give our calibration strategy.
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WEPMA034	Bakeout Concept for the HESR at FAIR	vacuum, ion, heavy-ion, controls	2832
	H. Jagdfeld, N. Bongers, P. Chaumet, F.M. Esser, F. Jordan, F. Klehr, G. Langenberg, U. Pabst, L. Semke FZJ, Jülich, Germany
	Forschungszentrum Jülich has taken the leadership of a consortium being responsible for the design of the High-Energy Storage Ring (HESR) going to be part of the FAIR project at GSI. The HESR is designed for antiprotons but can be used for heavy ion experiments as well. Therefore the vacuum is expected to be 10^-11 mbar or better. To achieve this also in the curved sections where 44 bent dipole magnets with a length of around 4.5 m will be installed, NEG coated dipole chambers will be used to reach the needed pumping speed and capacity. For activation of the NEG-material a bakeout system must be installed. The bakeout concept including the layout of the control system and the systematization of the heater packages for all components of the vacuum system are presented. Also the special design of the heater jackets inside the dipole will be shown where the geometrical parameters are very critical and space is very limited. The results of the simulation of temperature distribution in the dipole iron are compared to temperature measurements carried out at a testbench with different layouts of the heater jackets. The final design of the dipole heater jackets will be illustrated.
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WEPMA040	Magnet Studies for the Accelerator FLUTE at KIT	experiment, linac, multipole, simulation	2849
	S. Hillenbrand, A. Bernhard, A.-S. Müller, M.J. Nasse, R. Rossmanith, R. Ruprecht, M. Sauter, S. Schott, M. Schuh, S. Schulz, M. Weber, P. Wesolowski, C. Widmann KIT, Karlsruhe, Germany
	At KIT we are currently constructing the compact linear accelerator FLUTE (Ferninfrarot Linac Und Test Experiment). This 41 MeV machine is aimed at accelerator physics and synchrotron radiation research, using ultra-short electron bunches. The electrons are generated at a photo-cathode using picosecond long UV laser pulses. A magnetic chicane is used to compress the bunches longitudinally to a few femtoseconds. This contribution describes both the magnet design, in particular the optimization of the chicane dipoles based on finite element method (FEM) simulations, as well as the implementation of a magnet measurement system.
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WEPMA049	Development of the Ceramic Chamber Integrated Pulsed Magnet Fitting for a Narrow Gap	power-supply, vacuum, storage-ring, kicker	2879
	C. Mitsuda, T. Honiden, N. Kumagai, S. Sasaki JASRI/SPring-8, Hyogo-ken, Japan T. Nakanishi SES, Hyogo-pref., Japan A. Sasagawa KYOCERA Corporation, Higashiomi-city, Shiga, Japan
	We are pushing forward the development of a pulsed magnet that has a combined structure of magnet coils with a ceramic vacuum chamber, aiming to realize a small gap. The structure we are developing is that single turn air-coils are implanted along the longitudinal axis in the cylindrical ceramic chamber wall with thickness of 5mm. The ceramic wall works for separating the vacuum from the atmosphere, as well as holding the coil structures mechanically and the electrical insulation of coils. By this structure, magnet pole edges can be set close to the inside diameter of the chamber. The small gap increases magnetic field strength, which is for shorter length, and, as a result, the small magnet size reduces the inductance, which is for shorter pulse. We achieved the continuous operation over 200 days, without any failure, of current-excitation with 20 kV, 7.7 kA pulse with 4-μsec width and repetition of 1 Hz, using the dipole type prototype with a bore radius of 30 mm and magnetic length of 0.3m in 2013, while maintaining the vacuum pressure less than 10^-6 Pa. In this conference, we will discuss about the availability and practical utility with the magnetic field output performance.
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WEPMA050	Permanent Dipole Magnet R&D for SPring-8-II	quadrupole, permanent-magnet, shielding, simulation	2883
	T. Taniuchi, T. Aoki, K. Fukami, S. Takano, T. Watanabe JASRI/SPring-8, Hyogo-ken, Japan

Paper

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MOXGB3

LHC Commissioning at Higher Energy

operation, injection, hardware, cryogenics

6

P. Collier, F. Bordry, J. Wenninger
CERN, Geneva, Switzerland

The LHC has just come to the end of its first Long Shutdown (LS1) and preparations are underway to prepare for Run 2 data taking at 13 TeV centre of mass energy. After briefly recalling the major work undertaken during the 2-year long LS1, details will be given of the cool-down and hardware commissioning phase where each individual superconducting circuit is individually qualified for operation at nominal current. For the main dipole circuits this phase was completed with a quench training campaign in order to operate reliably at the required field. In parallel to the training campaign a rigorous cold checkout has been used to qualify the machine as an ensemble and to establish the conditions necessary for beam operation. The details of this phase will be given together with associated dry runs and beam injection tests. Finally, the latest news will be presented concerning the beam commissioning of the machine in preparation for first physics operation, which will hopefully begin in June.

Slides MOXGB3 [8.452 MB]

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MOPWA012

Study of Optimal MBA Lattice Structures for the SOLEIL Upgrade

emittance, lattice, optics, quadrupole

106

R. Nagaoka, P. Brunelle, F.J. Cullinan, X.N. Gavaldà, A. Loulergue, A. Nadji, L.S. Nadolski, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France

Within the context of a future upgrade of the SOLEIL ring, a series of lattice studies has been made with the aim of reducing the current 4 nm-rad horizontal emittance ex by more than an order of magnitude, with a dynamic aperture allowing off-axis injection. As in most upgrades, the important constraint imposed is to keep all the existing straight sections and photon source points. A particularity of SOLEIL are the short straight sections in half of the 16 double-bend cells, created in between the dipoles, which limits the number of dipoles in a MBA cell. In the previous studies, a combination of 5- and 4BA was followed, where with the use of longitudinal gradient bends (LGBs), ex ~440 pm-rad was obtained. The present paper reports on studies extended along the same strategy: In particular, the feasibility and the attainable ex are pursued with a combination of 7- and 6BA, by employing dipoles with transverse gradient and LGBs. In addition, the effectiveness of a few known nonlinear optimization methods, such as the resonance driving term cancellation, interleaved sextupoles with proper phases, and genetic algorithm-based numerical searches shall be explored.

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MOPWA014

New Functionality for Beam Dynamics in Accelerator Toolbox (AT)

lattice, radiation, simulation, emittance

113

B. Nash, N. Carmignani, L. Farvacque, S.M. Liuzzo, T.P. Perron, P. Raimondi, R. Versteegen, S.M. White
ESRF, Grenoble, France

Accelerator Toolbox is a widely used code for beam dynamic simulations based on Matlab. To continue the development of the code in a collaborative manner, a SourceForge project and SVN repository called atcollab has been established. Here we describe the contributions to atcollab from the ESRF beam dynamics group. Additional modules have been developed: general matching (atmatch), improved plotting (atplot), Touschek lifetime computation via the Piwinski formula, nonlinear dynamics computations such as resonance driving terms, improved reporting of lost particles and improvements and additions to the integration routines. One example of the latter includes diffusion due to quantum fluctuations. Modeling of collective effects may now be performed using pass methods representing a variety of impedance models. Finally, routines to replace the full ring with a compact representation have been developed, facilitating studies in which many turns and many particles are required.

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MOPWA016

Increasing the Dynamic and Momentum Apertures of the ThomX Ring by Means of Octupole Correctors

sextupole, octupole, resonance, multipole

121

J.F. Zhang, P. Bambade, A. Faus-Golfe, H. Monard
LAL, Orsay, France
A. Faus-Golfe
IFIC, Valencia, Spain
A. Loulergue
SOLEIL, Gif-sur-Yvette, France

Funding: Work is supported by ANR-10- EQPX-51 and ANR-11-IDEX-0003-02, and also by grants from Region Ile-de-France.
The electron ring of the compact Compton-backscattering X-ray source ThomX which is being built at LAL featured with a small circumference of 18 meters and a low beam energy 50-70 MeV, and its long term single particle dynamics is dominated by the non linear effects in the transverse and longitudinal planes. In this paper, we study the feasibilities to reduce the sextupole resonances and then increase the dynamic aperture and momentum aperture of the ThomX ring, using octupoles correctors.

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MOPWA017

Design Status of the ESSvSB Switchyard

proton, target, quadrupole, emittance

125

E. Bouquerel
IPHC, Strasbourg Cedex 2, France

The feasibility of the distribution of 5 MW proton beam power pulsed at 70 Hz onto a 4-target station for the production of neutrino super beams is discussed. To deflect and focus the beam having a magnetic rigidity of 11.0 Tm onto the targets, different configurations of beam switchyard are proposed and compared. The number of dipoles and quadrupoles composing this system is defined for each scenario. The length, the aperture, the magnetic fields and the field gradients of these optical elements are determined. The code TraceWin is used to simulate and optimize the envelopes of the beam along the beam lines. The transverse emittances at the exit of the system are shown.

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MOPWA019

Status of the Robinson Wiggler Project at the Metrology Light Source

wiggler, radiation, dynamic-aperture, damping

132

T. Goetsch, J. Feikes, M. Ries, G. Wüstefeld
HZB, Berlin, Germany

The beam lifetime in electron storage rings concerns machines running in decay mode as well as machines doing top-up. A standard procedure to increase the lifetime is via bunch lengthening as the lifetime depends on the electron density in the bunch. Bunch lengthening is typically achieved with higher harmonic (Landau) cavities. As noted in *, there are several advantages in using a different approach: it is possible to increase the bunch length by installing a Transverse Gradient (Robinson) Wiggler, which allows to transfer damping between the horizontal and the longitudinal plane. While increasing the bunch length, the horizontal emittance is being reduced yielding advantages regarding the source size depending on the magnet optics. At the Metrology Light Source, a primary source standard used by Germanys national metrology institute (Physikalisch-Technische Bundesanstalt)**, such a scheme is being investigated. The current state of the project including dynamic aperture effects and synchrotron radiation issues of the device is being presented in the following.
* T. Goetsch et al.,WEPRO028 in Proceedings of IPAC2014, Dresden (Germany), 2014
** R. Klein et al., Phys. Rev. ST-AB 11, 110701, 2008

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MOPWA020

Longitudinal Stability Of Short Bunches in Storage Rings with Strong Longitudinal Focusing

impedance, synchrotron, simulation, resonance

135

P. Kuske
HZB, Berlin, Germany

Funding: work supported by the BMBF
In the BESSY VSR project, the variable bunch length storage ring, two high gradient accelerating structures at 1.5 and 1.75 GHz will be phased such that long and short bunches can be stored simultaneously. The longitudinal stability of the short bunches is investigated taking into account the shielded CSR- and a purely inductive impedance. Multi particle tracking studies and numerical solutions of the Vlasov-Fokker-Planck equation show that threshold currents for short bunches do not follow the simple scaling law which was found for long bunches. The inductive impedance can even lower the thresholds for the instability. With an 80 times increased accelerating gradient and reasonable assumptions on the inductive impedance for shorter bunches stable operation can be expected with bunches 1.8 ps long (RMS-value) and 0.8 mA current. According to the calculations and operating in a dedicated low-α mode will produce stable 40 μA bunches with 400 fs length

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MOPWA030

Simulations of Electron Cloud Long Range Wakefields

electron, wakefield, simulation, proton

165

F.B. Petrov, O. Boine-Frankenheim
TEMF, TU Darmstadt, Darmstadt, Germany

Funding: Work supported by the BMBF under Contract No. 05H12RD7
A typical approach to electron cloud simulations is to split the problem in two steps: buildup simulations and instability simulations. In the latter step the cloud distribution is usually refreshed after each full interaction with the bunch. This approach does not consider multibunch effects. We present studies of the long range electron cloud wakefields generated in electron clouds after interaction with relativistic proton bunch trains. Several pipe geometries - relevant to CERN accelerators - with and without external magnetic field are considered. Using simple examples we show that the long range wakefields depend significantly on the secondary emission curve as well as on the pipe geometry. Additivity of electron cloud wakefields is studied as well.

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MOPWA033

Yacs - A New 2.5D FEM Eigenmode Solver for Axisymmetric RF-Structures

cavity, multipole, quadrupole, software

175

B.D. Isbarn, B. Riemann, M. Sommer, T. Weis
DELTA, Dortmund, Germany

Funding: Work supported by the BMBF under contract no. 05K13PEB
Most feasibility studies for modern accelerator concepts, including superconducting multicell RF-cavity-resonators in circular accelerators, depend on computing a large number of eigenmode frequencies and field patterns to obtain typical figures of merit. This task includes computational intensive numerical studies. To obtain the full eigenfrequency spectra most of these studies are performed in 3D, require a great amount of computation resources and thus are limited to a few hundred or thousand eigenmodes. To overcome this issue, some codes make use of the axisymmetric geometry of most of the RF-cavity-resonator structures and solve the problem in 2D. Solving in 2D however reduces the eigenmode spectra to eigenmodes with no azimuthal dependencies (so called monopole-modes). Due to the lack of freely available and easy to use 2.5D eigenmode solvers which are able to solve for the full 3D field in a reduced 2.5 dimensional problem, we developed yet another cavity solver (Yacs), a simple FEM based solver capable of solving for the full 3D eigenmodes of axisymmetric problems while only requiring a fraction of the computation resources required by most modern 3D codes.

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MOPWA035

Two General Orbit Theorems for Efficient Measurements of Beam Optics

closed-orbit, storage-ring, optics, lattice

183

B. Riemann, A. Ferrarotto, P. Hartmann, B.D. Isbarn, S. Koetter, M. Sommer, P. Towalski, T. Weis
DELTA, Dortmund, Germany

Closed-orbit perturbations and oscillating beam solutions in storage rings are closely related. While techniques exist to fit accelerator models to closed-orbit perturbations or to oscillation data, the exploitation of their relation has been limited. In this work, two orbit theorems that allow an efficient computation of optical parameters in storage rings with older hardware are derived for coupled linear beam motion. The monitor theorem is based on an uncoupled case study described by the author in an earlier work and has been generalized as well as simplified in mathematical abstraction to provide a reliable and computationally stable framework for beam optics measurements. It is based on a closed-orbit measurement utilizing 4 dipole correctors (2 for each plane). The corrector theorem allows to obtain parameters of these dipole correctors using two turn-by-turn monitors at almost arbitrary positions in the ring (which do not need to be located in a drift space), so that it is possible to uniquely resolve closed orbits into optical parameters without sophisticated lattice models.

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MOPWA037

Mirror Symmetric Chicane-Type Emittance Exchange Beamline with Two Deflecting Cavities

quadrupole, emittance, focusing, cavity

190

V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany

Among optical systems for transverse-to-longitudinal emittance exchange (EEX) chicane-type beamlines are of keen interest, because they do not alter the beam propagation direction. Several designs of such beamlines involving a single dipole-mode cavity (TDC) are known. In this paper we present a chicane-type EEX beamline utilizing two TDCs instead of one. The advantages of this beamline are that it is mirror symmetric and does not require an additional accelerating mode cavity for compensation of the so-called thick-lens effect, and, in the compact design, it allows better control of the beam focusing in the non-bending plane than known beamlines with one TDC.

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MOPWA044

Quasi-frozen Spin Method for EDM Deuteron Search

storage-ring, proton, simulation, lattice

213

Y. Senichev, A. Lehrach, B. Lorentz, R. Maier
FZJ, Jülich, Germany
S.N. Andrianov, A.N. Ivanov
St. Petersburg State University, St. Petersburg, Russia
M. Berz, E. Valetov
MSU, East Lansing, Michigan, USA
S. Chekmenev
RWTH, Aachen, Germany

To search for EDM using proton storage ring with purely electrostatic elements the concept of frozen spin method has been proposed by BNL. This method is based on two facts: in the equation of the spin precession the magnetic field dependence is entirely eliminated and at “magic” energy the spin precession frequency coincides with the precession frequency of the momentum. In case of deuteron the anomalous magnetic moment is negative (G=-0.142), therefore we have to use the electrical and magnetic field simultaneously keeping the frozen spin direction along the momentum as in the pure electrostatic ring. In this article we suggest the concept of the quasi-frozen spin when the spin oscillates around the momentum direction within the half value of the advanced spin phase each time returning back by special optics. Due to the low value of the anomalous magnetic moment of deuteron an effective contribution to the expected EDM effect is reduced only by a few percent.

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MOPWA045

First Tests of a Beam Transport System from a Laser Wakefield Accelerator to a Transverse Gradient Undulator

electron, quadrupole, undulator, beam-transport

216

C. Widmann, V. Afonso Rodríguez, A. Bernhard, A.-S. Müller, R. Rossmanith, W. Werner
KIT, Karlsruhe, Germany
M. Kaluza, M. Nicolai, M.B. Schwab, A. Sävert
IOQ, Jena, Germany
M. Kaluza, S. Kuschel
HIJ, Jena, Germany

An experimental setup for the generation of monochromatic undulator radiation at the laser wakefield accelerator (LWFA) in Jena using a transverse gradient undulator (TGU) is planned. Proper matching of the betatron functions and the dispersion of the electron beam to the undulator is essential. Therefor a beam transport system with strong focusing magnets and chromatic correction of these magnets is required. As a first step, a linear beam transport system without chromatic correction was assembled at the LWFA. With this setup the electron beam’s dispersion and the beta function of one selected energy are matched to the required parameters at the TGU. This contribution presents the experimental results of these measurements.

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MOPWA065

Uniformization of the Transverse Beam Profile by a New Type Nonlinear Magnet

octupole, target, multipole, simulation

272

G. Gu, W.B. Liu
IHEP, Beijing, People's Republic of China

The uniform particle beam is desirable in many beam applications. One method to get this type of beam distribution is using octupoles, but loss of particles in the halo will be produced by this method. To reduce the beam loss, a new type of magnet is proposed in this paper. The field in the middle region of the new type magnet is similar to the octupole magnet field, but the rate of rise decline quickly in the edge. So that the particle in the edge experience a lower magnet field, and this would result in less particle loss. We also add a mechanical structure on the new type magnet to make it possible to adjust the size of middle region. So that the magnet can adapt to different transverse dimensions of the beam, and this would further reduce particle loss. Some numerical simulations have been done respectively with octuples and the new type of magnet. The simulation results show that the new type of magnet could get the uniform distribution of particle beam with less particle loss. We are processing a magnet now, and an experiment to test the magnet will be arranged on CPHS.

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MOPJE001

Effect on Beam Dynamics From Wakefields in Travelling Wave Structure Excited by Bunch Train

wakefield, simulation, electron, radiation

289

D. Wang, C.-X. Tang
TUB, Beijing, People's Republic of China
W. Gai, C.-J. Jing, J.G. Power
ANL, Argonne, Illinois, USA
J.Q. Qiu
Euclid TechLabs, LLC, Solon, Ohio, USA

Electron bunch train technology is used to excited coherent high power RF radiation in travelling wave (TW) structures. This article concentrates on the analytical expression of wakefields excited by bunch train in TW structures and the effects of wakefields on beam dynamics. We focus on the first monopole mode and the first dipole mode wakefields. The long range wake function has a linear decrease which agrees well with the ABCi simulations. Taking example of the 11.7 GHz wakefields structure at the Argonne Wakefield Accelerator (AWA) facility, with 1.3 GHz interval drive electron bunch train, we have done the beam dynamics simulation with a point to point (P2P) code. Results shows the effects of wakefields on the energy distribution and the transverse instability for each sub-bunch.

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MOPJE051

Effect of Electron Cloud in Quadrupoles on Beam Instability

quadrupole, electron, simulation, emittance

409

G. Iadarola, A.P. Axford, H. Bartosik, K.S.B. Li, G. Rumolo
CERN, Geneva, Switzerland

Both simulations and machine experience at the CERN-SPS and LHC have shown that the electron cloud has a lower build up threshold in quadrupoles than in dipoles and field free regions. As a consequence, while beam induced scrubbing can efficiently suppress the electron cloud in both dipoles and field free regions, a residual electron cloud can still survive in the quadrupoles and potentially degrade the beam quality. To study this effect, a PyECLOUD module for electron tracking in quadrupole fields including effects of secondary emission at the vacuum chamber has been implemented in PyHEADTAIL. With this module, the effect of the electron cloud in quadrupoles on beam stability and beam quality preservation can be assessed, as well as its impact on future LHC and HL-LHC operation.

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MOPJE052

Observations of an Anomalous Octupolar Resonance in the LHC

simulation, resonance, betatron, hadron

412

F.S. Carlier, J.M. Coello de Portugal, A. Langner, E.H. Maclean, T. Persson, R. Tomás, R. Westenberger
CERN, Geneva, Switzerland

While linear LHC dynamics is mostly understood and under control, non-linear beam dynamics will play an increasingly important role in the challenging regimes of future LHC operation. In 2012, turn-by-turn measurements of large betatron excitations of LHC Beam 2 at injection energy were carried out. These measurements revealed an unexpectedly large spectral line in the horizontal motion with frequency Qx+2Qy. Detailed analyses and simulations are presented to unveil the nature of this spectral line.

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MOPJE057

Optics Measurement using the N-BPM Method for the ALBA Synchrotron

optics, quadrupole, betatron, synchrotron

430

A. Langner, J.M. Coello de Portugal, R. Tomás
CERN, Geneva, Switzerland
G. Benedetti, M. Carlà, U. Iriso, Z. Martí
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

The N-BPM method recently developed for the LHC has significantly improved the precision of optics measurements which are based on beam position monitor (BPM) turn-by-turn data. The main improvement is owed to the consideration of correlations for statistical and systematic error sources, as well as increasing the amount of BPM combinations for one measurement. We present how this technique can be applied at light sources like ALBA, and compare the results with other methods.

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MOPJE060

BBA and Coupling Correction at CLIC RTML

emittance, coupling, quadrupole, alignment

442

Y. Han, L. Ma
SDU, Shandong, People's Republic of China
A. Latina, D. Schulte
CERN, Geneva, Switzerland

The CLIC Ring To Main Linac (RTML) must transport the electron and the positron bunches through more than 20 km of beamlines with minimal emittance growth. The turnaround loops (TAL) are one of the most critical sections, featuring a lattice designed to minimize emittance growth due to synchrotron radiation emission and chromaticity, while being isochronous to avoid bunch lengthening. With such a design, the impact of static imperfections like element misalignment is particularly critical. In this paper a study of the Beam-Based Alignment (BBA) techniques in the TAL of the CLIC RTML is presented. In order to reduce the emittance growth, the one-to-one and dispersion-free corrections have been tested. The results showed that the emittance growth budgets can be met both in the horizontal and vertical planes. The impact of coupling errors due to magnets rolls on the emittance has also been studied and a coupling correction section has been designed and inserted in the lattice.

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MOPJE063

Orbit Correction in the CERN PS Booster

quadrupole, closed-orbit, alignment, booster

449

M. McAteer, E. Benedetto, C. Carli, G.P. Di Giovanni, B. Mikulec, R. Tomás
CERN, Geneva, Switzerland

Funding: This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no (PITN-GA-2011-289485-OPAC).
Prior to the Long Shutdown of 2013-2014 (LS1), control of the closed orbit in the four rings of the CERN PS Booster (PSB) was achieved by adjusting the alignment of several focusing quadrupoles. After a set of orbit corrector dipoles was installed, a major realignment campaign was undertaken to remove these intentional quadrupole offsets and any other magnet misalignments. This paper summarizes the effects of the magnet realignment on the closed orbit in the PSB and the results of closed orbit correction with corrector dipoles.

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MOPJE067

Applications of PLACET2 to the CTF3 Combiner Ring

simulation, quadrupole, optics, wiggler

462

D. Pellegrini, R. Corsini, D. Gamba, A. Latina
CERN, Geneva, Switzerland

The CTF3 Combiner Ring (CR) is an isochronous ring that employs RF-injection to combine multiple bunch trains (up to five) into a single one with higher bunch frequency. The length of the CR plays a critical role in obtaining the correct structure of the recombined train. PLACET2: the new recirculating version of the code PLACET is particularly suited to simulate the operational scenario. In order to validate this code, three different case studies have been considered: ring-length variations due to energy detuning, fast-beam decoherence due to uncorrected chromatic effects and vertical instabilities due to bunch-to-bunch wakefield effects. The first two effects have been measured during the last run and the predictions have been validated. The instability has been compared with previous studies. The results are presented and discussed.

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MOPJE068

PLACET2: A Novel Code for Beam Dynamics in Recirculating Machines

linac, simulation, lattice, operation

465

D. Pellegrini, A. Latina, D. Schulte
CERN, Geneva, Switzerland

Efforts have been taken to enable the simulation of recirculating machines in PLACET. The new version, PLACET2, allows handling multiple interconnected beamlines in order to obtain a realistic model of a machine. Two new elements, injectors and dumps, have been introduced and are active components of any working machine. Trains of bunches are routed through beamlines and tracked simultaneously in a parallel manner. Tracking through time-dependent elements is possible, and care is made to preserve the correct time-structure of the beam in case of beam recombination. This allows straightforward computations of multi-bunch effects arising with high-charge and shortly spaced bunch trains, even with variable train structure. The main features of the code are presented together with its working principles and its key ideas. Two case studies are introduced: LHeC and the CTF3 combiner ring.

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MOPMA011

Evaluation of Power Supply and Alignment Tolerances for the Advanced Photons Source Upgrade

sextupole, quadrupole, power-supply, factory

556

V. Sajaev
ANL, Argonne, Ilinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The hybrid seven-bend-achromat lattice that has been proposed for the Advanced Photon Source upgrade will feature very strong focusing elements and will provide an electron beam with very low emittance. In order to be able to maintain stable operation, very tight tolerances are required for various types of errors. Here we describe evaluation of the effects of various errors including magnet power supplies, alignment, and vibration. Based on this analysis, we determine short- and long-term stability requirements

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MOPMA020

Measurement and Correction of the Fermilab Booster Optics with LOCO

lattice, booster, optics, quadrupole

586

C.-Y. Tan, V.A. Lebedev, A.K. Triplett
Fermilab, Batavia, Illinois, USA
M. McAteer
CERN, Geneva, Switzerland

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The optics of the original Booster lacked the ability for full optics correction and it was not until 2009 when new optics corrector packages were installed between gradient magnets that this ability became available. The optics correction method that is chosen is called LOCO (Linear Optics from Closed Orbits) that measures the orbit response from every beam position monitor (BPM) in the ring from every kick of every dipole corrector. The large data set collected allows LOCO to not only calculate the quadrupole and skew quadrupole currents that both reduces beta beatings and corrects coupling, it also finds the dipole kicker strengths, BPM calibrations and their tilts by minimizing the difference between the measured and ideal orbit response of the beam. The corrected optics have been loaded into Booster and it is currently being tested to be eventually used in normal operations.

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MOPMA025

CSR Induced Microbunching Gain Estimation including Transient Effects in Transport and Recirculation Arcs

impedance, lattice, simulation, damping

596

C.-Y. Tsai
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
D. Douglas, R. Li, C. Tennant
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
The coherent synchrotron radiation (CSR) of a high brightness electron beam traversing a series of dipoles, such as transport or recirculation arcs, may result in the microbunching instability (μBI). To accurately quantify the direct consequence of this effect, we further extend our previously developed semi-analytical simulation [C. -Y. Tsai et al., FEL Conference 2014 (THP022)] to include more relevant coherent radiation models than the steady-state free-space CSR impedance, such as the entrance and exit transient effects, which derive from upstream beam entering to and exiting from individual dipoles and propagating across the elements to downstream straight sections. Then we semi-analytically solve the linearized Vlasov equation for the amplification factor. The resultant gain functions and spectra for our example lattices are presented and compared with particle tracking simulation. Some underlying physics with inclusion of these effects are also discussed.

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MOPMA039

Secondary Electron Yield Measurement and Electron Cloud Simulation at Fermilab

electron, simulation, proton, vacuum

629

Y. Ji
IIT, Chicago, Illinois, USA
L.K. Spentzouris
Illinois Institute of Technology, Chicago, Illinois, USA
R.M. Zwaska
Fermilab, Batavia, Illinois, USA

Funding: This work was funded by the National Science Foundation under the grant no. 1205811.
Fermilab Main Injector is upgrading the accelerator to double the beam intensity from 24·10¹² protons to 48·10¹² protons, which brings the accelerator into a regime where electron cloud effects may limit the accelerator performance. In fact, an instability that could be caused by electron cloud effects has already been observed in the Recycler. Secondary Electron Yield (SEY) is an important property of the vacuum chamber material that has great influence on the process of building up free electrons. The Main Injector of the Fermilab accelerator complex offers the opportunity to measure SEY and conditioning effects in the environment of a running accelerator, since samples of these materials are located at the beampipe wall. The SEY of stainless steel (SS316L) and TiN coated SS316L in the proximity of the proton beam were measured and compared. A series of simulation studies of electron cloud build up were done for the Main Injector and Recycler using the code POSINST. Parametric studies were done to determine the maximum electron density vs. peak SEY at different beam intensities in the Fermilab Main Injector. Threshold simulations of electron cloud density verus SEY were extended from Main Injector to include the Recycler Ring. It was found that the electron cloud density around the beam depends on bunch location within the bunch train.

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MOPMA040

Analysis of Beam Transverse Instabilities at Fermilab

space-charge, coupling, impedance, quadrupole

633

T. Zolkin
University of Chicago, Chicago, Illinois, USA

The transverse beam dynamics in Fermilab Recycler ring has been analyzed using SCHARGEV Vlasov solver. In the first part of paper we discuss how SCHARGEV analyses collective instabilities for Gaussian bunch with strong space charge in resistive impedance environment. In the second part the bunched beam dynamics is studied depending on head-tail phase and damper gain. An example for Fermilab Recycler is presented.

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MOPMA041

Experimental Observation of Head-Tail Modes for Fermilab Booster

booster, linac, space-charge, betatron

636

T. Zolkin
University of Chicago, Chicago, Illinois, USA
A.V. Burov, V.A. Lebedev
Fermilab, Batavia, Illinois, USA

The Fermilab Booster is known to suffer from beam transverse instabilities. An experimental attempt of head-tail modes extraction from the stable beam motion by periodic excitement of betatron motion has been performed. The shapes of head-tail modes have been successfully obtained while eigenfrequencies separation from the betatron tune were too small to be resolved. The qualitative agreement between the theory and an experimental data has been demonstrated. This is an important step towards the understanding of general theory of collective instabilities for strong space charge case, which is a rather typical case for hadron machines.

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MOPMA051

Generation of Modulated Bunch Using a Masked Chicane for Beam-Driven Acceleration Experiments at ASTA

simulation, bunching, space-charge, emittance

666

Y.-M. Shin, P. Piot
Northern Illinois University, DeKalb, Illinois, USA
D.R. Broemmelsiek, D.J. Crawford, A.H. Lumpkin
Fermilab, Batavia, Illinois, USA
A.T. Green
Northern Illinois Univerity, Dekalb, Illinois, USA

Funding: This work was supported by the DOE contract No. DEAC02-07CH11359 to the Fermi Research Alliance LLC.
Longitudinal density modulations on electron beams can improve machine performance of beam-driven accelerators and FELs with resonance beam-wave coupling *. The sub-ps beam modulation has been studied with a masked chicane ** *** by the analytic model and simulations with the beam parameters of the Advanced Superconducting Test Accelerator (ASTA) in Fermilab. With the nominal 50 MeV chicane parameters and 3 ps bunch length, the analytic model showed that a slit-mask with slit period 900 um and aperture width 300 μm generates about 100-um modulation periodicity with 2.4% correlated energy spread. With the designed slit mask and a 3 ps bunch, particle-in-cell simulations (CST-PS), including nonlinear energy distributions, space charge force, and coherent synchrotron radiation (CSR) effect, also result in ~ 100 um of longitudinal modulation. The beam modulation has been extensively examined with three different beam conditions, 0.25, 1 , and 3.2 nC, by extended 3D tracking simulations (Elegant). The modulated bunch generation will be tested by a slit-mask installed at the chicane of the ASTA 50-MeV-injector beamline for beam-driven acceleration experiments.
* E. Kallos, Southern California 2008
** D. C. Nguyen, B. E. Carlston, NIMA 375, 597 (1996)
*** P. Muggli, V. Yakimenko, M. Babzien, E. Kallos, and K. P. Kusche, PRL 101, 054801 (2008)

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MOPMN010

Non-linear Magnetic Inserts for the Integrable Optics Test Accelerator

vacuum, alignment, optics, quadrupole

724

F.H. O'Shea, R.B. Agustsson, Y.C. Chen, E. Spranza
RadiaBeam, Santa Monica, California, USA
D.W. Martin, J.D. McNevin
RadiaBeam Systems, Santa Monica, California, USA

We present here a status update of the manufacture and magnetic measurements of the non-linear inserts for the Integrable Optics Test Accelerator. RadiaBeam Technologies is designing the 2-meter structure from magnetic field specifications, including pole design, measurement systems and alignment fiducialization. Herein, we will describe the current state of the project.

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MOPMN028

Design of Bunch Compressing System with Suppression of Coherent Synchrotron Radiation for ATF Upgrade

emittance, electron, simulation, linac

760

Y.C. Jing, M.G. Fedurin, D. Stratakis
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Brookhaven National Laboratory Accelerator Test Facility (BNL ATF) is in the process of upgrading to ATF2 with higher electron beam energy thus expanding its capabilities. For the fully upgraded electron beam (500 MeV), it will be of great interest to compress the bunch to femto-seconds scale while maintaining high peak current (~7,800 amps) for users. A bunch compressor composed of magnetic chicanes can be utilized for this purpose. However, during such strong compression, beam quality can easily be deteriorated by Coherent Synchrotron Radiation (CSR). In this paper, we present our study for a bunch compressor where this CSR effect is compensated through careful manipulation of phase space. We also show a beam with good quality is preserved through the system by presenting a start to end simulation.

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MOPHA041

Laser Wire Based Transverse Emittance Measurement of H⁻ Beam at Spallation Neutron Source

emittance, laser, electron, neutron

879

Y. Liu, A.V. Aleksandrov, C.D. Long, A.A. Menshov, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725.
A laser wire based transverse emittance measurement system has been developed at the Spallation Neutron Source (SNS). The system enables a nonintrusive measurement of the transverse emittance in both directions on a 925 MeV/1 MW hydrogen ion (H⁻) beam at the high energy beam transport (HEBT) beam line.

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MOPTY004

Wakefield Monitor Experiments with X-Band Accelerating Structures

wakefield, linac, pick-up, hardware

947

R.L. Lillestøl, E. Adli, J. Pfingstner
University of Oslo, Oslo, Norway
R. Corsini, S. Döbert, W. Farabolini, L. Malina, W. Wuensch
CERN, Geneva, Switzerland

The accelerating structures for CLIC must be aligned with a precision of a few um with respect to the beam trajectory in order to mitigate emittance growth due to transverse wake fields. We report on first results from wake field monitor tests in an X-band structure, with a probe beam at the CLIC Test Facility. The monitors are currently installed in the CLIC Two-Beam Module. In order to fully demonstrate the feasibility of using wakefield monitors for CLIC, the precision of the monitors must be verified using a probe beam while simultaneously filling the structure with high power rf used to drive the accelerating mode. We outline plans to perform such a demonstration in the CLIC Test Facility.

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MOPTY064

Compensation Strategies for Ramping Waveform of TPS Booster Synchrotron Main Power Supplies

power-supply, booster, controls, quadrupole

1088

P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, K.-B. Liu, B.S. Wang, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Booster synchrotron for the Taiwan photon source project which is a 3 GeV synchrotron light source constructed at NSRRC is in commissioning. The booster is designed to ramp electron beams from 150 MeV to 3 GeV in 3 Hz therefore the large main power supplies have features of waveform play with trigger functionalities to enable electron beams ramp from 150 MeV to 3 GeV in 3 Hz. However, due to limited bandwidth of power supplies, different magnet loading will result in quite different phase lag for dipoles and four quadrupoles families. To improve tracking error between quadrupole to dipole readings, several strategies are developed and will be summarized in this report.

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MOPTY069

Control Interface and Functionality of TPS Booster Power Supply

power-supply, booster, controls, quadrupole

1094

C.Y. Wu, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, D. Lee, C.Y. Liao
NSRRC, Hsinchu, Taiwan

The TPS booster is a synchrotron with injection energy at 150 MeV and extraction energy at 3 GeV in 3 Hz. Booster main power supplies consist of one dipole power supply with maximum current 1200 Ampere and four quadrupole family power supplies with maximum current of 120/150 Ampere. The small power supply for booster corrector and sextupole is a low noise switching power supply with ± 10 Ampere current range. The TPS booster control environment is based on EPICS framework to support rich functionalities including power supply control, waveform management, operation supports, and so on. All power supplies support DC mode and 3 Hz ramping mode operation for TPS booster commissioning and operation. Efforts on control interface and functionality for TPS booster power supply will be summarizes.

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MOPTY075

Vibration Measurement of the Magnets in the Storage Ring of TPS

quadrupole, storage-ring, ground-motion, data-acquisition

1112

C.H. Huang, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, D. Lee, C.Y. Liao
NSRRC, Hsinchu, Taiwan

Taiwan photon source is a 3rd generation synchrotron light source which is in beam commissioning at NSRRC. Orbit stability within 100 nm range is essential for such a small emittance light source. Technical noise from the vacuum pumps, water flow, etc. will cause the vibration of quadrupoles and deleterious orbit stability. In order to investigate the magnitude of vibration in the magnets of the storage ring, the vibration spectra of the lattice quadruples; the coherence between the magnets, girders and ground will be systematic investigated in this report.

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MOPWI001

First Results From Beam Tests of the CLIC Drive Beam Phase Feedforward Prototype at CTF3

kicker, hardware, optics, operation

1139

J. Roberts, P. Burrows, G.B. Christian, C. Perry
JAI, Oxford, United Kingdom
A. Andersson, R. Corsini, P.K. Skowroński
CERN, Geneva, Switzerland
A. Ghigo, F. Marcellini
INFN/LNF, Frascati (Roma), Italy

Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu-CARD, grant agreement no. 227579.
In the CLIC two beam acceleration scheme 100 MV/m normal conducting cavities are fed with RF power extracted from a secondary high power but low energy drive beam. To ensure the efficiency and luminosity performance of CLIC the phase synchronisation between the high energy main beam and the drive beam must be maintained to within 0.2 degrees of 12 GHz. To reduce the drive beam phase jitter to this level a low-latency drive beam phase feedforward correction with bandwidth above 17.5 MHz is required. A prototype of this system has been installed at the CLIC test facility CTF3 to prove its feasibility, in particular the challenges of high bandwidth, high power and low latency hardware. The final commissioning and first results from operation of the complete phase feedforward system are presented here.

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MOPWI002

Bunch Length Measurements using Synchrotron Light Monitor

linac, emittance, synchrotron, injection

1143

M.M. Ali, M.G. Tiefenback
JLab, Newport News, Virginia, USA

The bunch length is measured at CEBAF using an invasive technique. The technique depends on applying an energy chirp for the electron bunch and imaging it through a dispersive region. The measurements are taken through Arc1 and Arc2 at CEBAF. The fundamental equations, procedure and the latest results are given.

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TUAD1

Magnet Design and Control of Field Quality for TPS Booster and Storage Rings

quadrupole, sextupole, vacuum, multipole

1370

J.C. Jan, C.H. Chang, C.-T. Chen, H.H. Chen, Y.L. Chu, M.-H. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin, G.-H. Luo, I.C. Sheng, C.S. Yang, Y.T. Yu
NSRRC, Hsinchu, Taiwan

High-quality and very demanding magnets were designed, fabricated, field quality controlled and installed in the Taiwan Photon Source (TPS). The Storage Ring (SR) lattice is based on double-bend achromat structure with 1.6 nm-rad emittance and slight dispersion in straight sections. The fabrication and field measurement of these magnets were completed in Oct. 2013. The first synchrotron light from TPS storage ring, without applying any corrector at 3 GeV, was observed on Dec. 31, 2014. It indicates that the profile precision and field quality of magnets, and girders alignment reach world class standard. The integral multipoles components of the 240 SR quadrupole and 168 SR sextupole magnets conform to strict specifications. The maximum offset of measured mechanical center in magnets is better than 0.01 mm after feet shimming. The magnetic center offset of the magnets is within 0.02 mm inspected by rotating-coil method. The magnets’ field quality of booster’s pure quadrupole and combined-function quadrupole were accepted according to the errors specifications from beam dynamics and also in the beam commissioning. A permeability study of vacuum chamber was implemented during the booster ring hardware testing. The magnetic field of magnets is distorted by the permeability of vacuum chamber. Study of multipole errors due to magnetized vacuum chamber inside the magnet will be discussed.

Slides TUAD1 [2.698 MB]

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TUBD3

Effects of Accelerating Structures on On-line DFS in the Main Linac of CLIC

wakefield, emittance, linac, simulation

1387

J. Pfingstner, E. Adli
University of Oslo, Oslo, Norway
D. Schulte
CERN, Geneva, Switzerland

Long-term ground motion will create significant dispersion in the time-scale of hours in the main linac of CLIC. To preserve the emittance to an acceptable level, a dispersion correction with on-line dispersion-free steering (DFS) is inevitable. For this on-line technique, the dispersion has to be measured using beam energy variations of only about one per mil in order to not disturb the operation of the accelerator. For such small energy variations, the interaction of the particle beam and the accelerating structures creates large enough additional signals components in the measured dispersion to cause the dispersion correction to not work properly anymore. In this paper, the additional signals are described and their effect on the DFS algorithm is analysed. Finally, methods for the mitigation of the deteriorating signal components are presented and studied via simulations.

Slides TUBD3 [1.697 MB]

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TUPWA002

Layout Options for the AXXS Injector and XFEL

linac, storage-ring, FEL, lattice

1394

M.J. Boland, Y.E. Tan, D. Zhu
SLSA, Clayton, Australia

A new injector is being planned for the Australian Synchrotron that is designed to feed both an upgraded storage ring and an XFEL. The desire to fit the AXXS project on the same site as the existing light source presents several layout difficulties. Several options are studied and simulations are performed to check the impact each choice has on the beam performance.

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TUPWA006

SIRIUS ACCELERATORS STATUS REPORT

storage-ring, booster, vacuum, quadrupole

1403

A.R.D. Rodrigues, F.C. Arroyo, O.R. Bagnato, J.F. Citadini, R.H.A. Farias, J.G.R.S. Franco, L. Liu, S.R. Marques, R.T. Neuenschwander, C. Rodrigues, R.M. Seraphim, O.H.V. Silva
LNLS, Campinas, Brazil

Sirius is a 3 GeV synchrotron light source that is being built by the Brazilian Synchrotron Light Laboratory (LNLS). The electron storage ring is based on a modified 5BA cell to achieve a bare lattice emittance of 0.27 nm.rad in a 518 m circumference ring that contains 20 straight sections of alternating 6 and 7 meters in length. The 5BA cell accommodates a thin permanent magnet high field (2 T) dipole in the center of the middle bend producing hard X-ray radiation (εc=12 keV) with a modest contribution to the total energy loss. In this paper we discuss the main achievements and issues for Sirius accelerators. Developments in beamlines are not discussed here.

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TUPWA052

Elettra 2.0 - The Next Machine

lattice, quadrupole, emittance, dynamic-aperture

1532

E. Karantzoulis
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

A next generation light source (ULS) to replace Elettra, the third generation Italian light source, is presented and discussed

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TUPJE041

Progress on a Compact Accelerator Design for a Compton Light Source

gun, linac, space-charge, solenoid

1706

K.E. Deitrick, J.R. Delayen, B.R.P. Gamage, G.A. Krafft, T. Satogata
ODU, Norfolk, Virginia, USA

A compact Compton light source using an electron linear accelerator is in design at the Center for Accelerator Science at Old Dominion University and Jefferson Lab. We report on the current design, including beam properties through the entire system based on a full end-to-end simulation, compare current specifications to design goals, and target areas for improvement.

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TUPJE048

Orbit Correction and Stability Studies for Ultra-Low Emittance Storage Rings

photon, emittance, simulation, storage-ring

1728

M. Böge, M. Aiba, A. Streun
PSI, Villigen PSI, Switzerland

Ultra-low emittance storage rings exhibit extremely strong focusing and sextupolar chromaticity corrections. The therefore mandatory excellent centering of the closed orbit in the small aperture magnets is a challenging task and necessitates a proper beam diagnostics and correction layout. Correction and stability studies for a possible ultra-low emittance upgrade of the Swiss Light Source are presented.

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TUPJE067

Status of the APS Upgrade Project

brightness, photon, lattice, emittance

1791

S. Henderson
ANL, Argonne, Ilinois, USA

Funding: Work supported by U.S. Dept. of Energy, Office of Science, under Contract No. DE-AC02-06CH11357
A concept for an upgrade to the Advanced Photon Source based on a multi-bend achromat lattice is being developed at Argonne National Laboratory. An MBA upgrade to the APS will reduce the horizontal emittance by a factor of ~50. Coupled with superconducting undulators, the APS-U brightness will be two to three orders of magnitude beyond that which is available today at the APS.

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TUPJE068

Development and Performance of 1.1-m Long Superconducting Undulator at the Advanced Photon Source

undulator, photon, operation, storage-ring

1794

Y. Ivanyushenkov, C.L. Doose, J.F. Fuerst, E. Gluskin, K.C. Harkay, Q.B. Hasse, M. Kasa, Y. Shiroyanagi, D. Skiadopoulos, E. Trakhtenberg
ANL, Argonne, Ilinois, USA

Funding: Work supported by U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Development of superconducting undulators continues at the Advanced Photon Source (APS). The second superconducting undulator, SCU1, has been built and installed in the storage ring of the APS. This undulator has a 1.1-m long superconducting magnet and utilizes an improved version of the cryostat of the first superconducting undulator, SCU0. The results of the cold test of the SCU1, and its performance in the APS storage ring are presented in this paper.

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TUPJE071

Alternate Lattice Design for Advanced Photon Source Multi-Bend Achromat Upgrade

lattice, injection, quadrupole, accumulation

1803

Y. Sun, M. Borland
ANL, Argonne, Ilinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
A 67-pm hybrid-seven-bend achromat (H7BA) lattice is proposed for a future Advanced Photon Source (APS) multi-bend-achromat (MBA) upgrade. This lattice requires use of a swap-out (on-axis) injection scheme. Alternate lattice design work has also been performed to achieve better beam dynamics performance than the nominal APS MBA lattice, in order to allow beam accumulation. One of such alternate H7BA lattice designs, which still targets a very low emittance of 76 pm, is discussed in this paper. With these lattices, existing APS injector complex can be employed without the requirement of a very high charge operation. Studies show that an emittance below 76 pm can be achieved with the employment of reverse bends in an alternate lattice. We discuss the predicted performance and requirements for these lattices and compare them to the nominal lattice.

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TUPJE080

First Beam and High-Gradient Cryomodule Commissioning Results of the Advanced Superconducting Test Accelerator at Fermilab

cavity, cryomodule, accelerating-gradient, diagnostics

1831

D.J. Crawford, C.M. Baffes, D.R. Broemmelsiek, K. Carlson, B.E. Chase, E. Cullerton, J.S. Diamond, N. Eddy, D.R. Edstrom, E.R. Harms, A. Hocker, C.D. Joe, A.L. Klebaner, M.J. Kucera, J.R. Leibfritz, A.H. Lumpkin, J.N. Makara, S. Nagaitsev, O.A. Nezhevenko, D.J. Nicklaus, L.E. Nobrega, P. Piot, P.S. Prieto, J. Reid, J. Ruan, J.K. Santucci, W.M. Soyars, G. Stancari, D. Sun, R.M. Thurman-Keup, A. Valishev, A. Warner, S.J. Wesseln
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The advanced superconducting test accelerator at Fermilab has accelerated electrons to 20 MeV and, separately, the International Linear Collider (ILC) style 8-cavity cryomodule has achieved the ILC performance milestone of 31.5 MV/m per cavity. When fully completed, the accelerator will consist of a photoinjector, one ILC-type cryomodule, multiple accelerator R&D beamlines, and a downstream beamline to inject 300 MeV electrons into the Integrable Optics Test Accelerator (IOTA). We report on the results of first beam, the achievement of our cryomodule to ILC gradient specifications, and near-term future plans for the facility.

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TUPMA025

X-Band RF Photoinjector for Laser Compton X-Ray and Gamma-Ray Sources

laser, electron, emittance, gun

1891

R.A. Marsh, G.G. Anderson, S.G. Anderson, C.P.J. Barty, D.J. Gibson
LLNL, Livermore, California, USA

Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
Extremely bright narrow bandwidth gamma-ray sources are expanding the application of accelerator technology and light sources in new directions. An X-band test station has been commissioned at LLNL to develop multi-bunch electron beams. This multi-bunch mode will have stringent requirements for the electron bunch properties including low emittance and energy spread, but across multiple bunches. The test station is a unique facility featuring a 200 MV/m 5.59 cell X-band photogun powered by a SLAC XL4 klystron driven by a Scandinova solid-state modulator. This paper focuses on its current status including the generation and initial characterization of first electron beam. Design and installation of the inverse-Compton scattering interaction region and upgrade paths will be discussed along with future applications.

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TUPMA033

A Bunch Compression Method for Free Electron Lasers that Avoids Parasitic Compressions

electron, laser, FEL, acceleration

1907

S.V. Benson, D. Douglas, C. Tennant, F.G. Wilson
JLab, Newport News, Virginia, USA
D.C. Nguyen
LANL, Los Alamos, New Mexico, USA

Funding: This work was supported by U.S. DOE Contract No. DE-AC05-84-ER40150, the Air Force Office of Scientific Research, DOE Basic Energy Sciences.
Virtually all existing high energy (>few MeV) linac-driven FELs compress the electron bunch length though the use of off-crest acceleration on the rising side of the RF waveform followed by transport through a magnetic chicane. This approach has at least three flaws: 1) it is difficult to correct aberrations- particularly RF curvature, 2) rising side acceleration exacerbates space charge-induced distortion of the longitudinal phase space, and 3) all achromatic "negative compaction" compressors create parasitic compression during the final compression process, increasing the CSR-induced emittance growth. One can avoid these deficiencies by using acceleration on the falling side of the RF waveform and a compressor with M56>0. This approach offers multiple advantages: 1) It is readily achieved in beam lines supporting simple schemes for aberration compensation, 2) Longitudinal space charge (LSC)-induced phase space distortion tends, on the falling side of the RF waveform, to enhance the chirp, and 3) Compressors with M56>0 can be configured to avoid spurious over-compression. We will discuss this bunch compression scheme in detail and give results of a successful beam test in April 2012 using the JLab UV Demo FEL

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TUPMA037

Commissioning of the 123 MeV Injector for 12 GeV CEBAF

cryomodule, optics, operation, injection

1920

Y.W. Wang, A.S. Hofler, R. Kazimi
JLab, Newport News, Virginia, USA

The injector energy needed to be raised from 67.5 MeV to 123 MeV to meet the energy requirement of the CEBAF 12 GeV upgrade. The ratio of the injector energy to the linac energy must remain 0.11284 at all times. Consequently, the injector was partially upgraded. The early injector, transport and acceleration from 130 keV to 6 MeV, is unchanged, but the downstream boost from 6 MeV to the final 123 MeV energy drove several changes. One of the two original CEBAF 25 MeV type cryomodules in the injector was upgraded to a 100 MeV capable one to provide more energy. Some trim magnets at the end of the injector were upgraded to compensate for the higher energy. The chicane region was expanded, and the full energy injector spectrometer was relocated to make room for the newly added Hall D line. Experience from the 6 GeV era indicated that the stray fields from the higher energy beam transport recombiners near the injection chicane adversely affect the injector orbit, so a study to understand and mitigate stray fields from the transport arc box supplies upgraded for 12 GeV led to shielding modifications for the beamline in the chicane region.

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TUPMA055

Analysis of Possible Beam Losses in the NSLS II Storage Ring

radiation, storage-ring, shielding, electron

1956

S. Seletskiy, R.P. Fliller, W. Guo, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, W.H. Wahl, F.J. Willeke
BNL, Upton, Long Island, New York, USA

The NSLS-II accelerators are installed within radiation shielding walls that are designed to attenuate the radiation generated from an assumed beam loss power to a level of <0.5mrem/h at the outer surface of the bulk shield walls. Any operational losses greater than specified level are expected to be addressed by installing supplemental shielding near the loss point in order to attenuate the radiation outside the shield wall to the design level. In this paper we report the analysis of the electron beam mis-steering in the NSLS-II storage ring for the determination of supplementary shielding.

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TUPHA010

Design of the NSLS-II Top Off Safety System

storage-ring, interlocks, injection, operation

1986

R.P. Fliller, L. Doom, G. Ganetis, C. Hetzel, P.K. Job, Y. Li, T.V. Shaftan, S.K. Sharma, O. Singh, G.M. Wang, Z. Xia
BNL, Upton, Long Island, New York, USA

The NSLS-II accelerators finished commissioning in the fall of 2014, with beamline commissioning underway. Part of the design for the NSLS-II is to operate in top off mode. The Top Off Safety System (TOSS) is presently under design. In this report we discuss the Top Off Safety System design and implementation, along with the necessary tracking results and radiological calculations.

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TUPTY001

Interaction Region for a 100 TeV Proton-Proton Collider

shielding, quadrupole, interaction-region, radiation

1996

R. Martin, R. Tomás
CERN, Geneva, Switzerland
B. Dalena
CEA/IRFU, Gif-sur-Yvette, France

As part of its post-LHC high energy physics program, CERN is conducting a study for a new proton-proton collider, FCC-hh, running at center-of-mass energies of up to 100 TeV, pushing the energy frontier of fundamental physics to a new limit. At a circumference of 80-100 km, this machine is planned to use the same tunnel as FCC-ee, a proposed 90-350 GeV high luminosity electron-positron collider. This paper presents the design progress and technical challenges for the interaction region of FCC-hh.

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TUPTY012

Orbit Correction in CEPC

quadrupole, closed-orbit, factory, target

2022

S. Bai, J. Gao, H. Geng
IHEP, Beijing, People's Republic of China

With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 10³⁴ cm^-2s^-1) is becoming more popular in the accelerator world. The CEPC project in China is one of them. To reduce the cost, pretzel scheme was considered in CEPC orbit design. The presence of every kind of errors and misalignments will destroy the pretzel orbit. In this paper, we correct the distorted pretzel orbit in the CEPC main ring using the dipole correctors and beam position monitors. The pretzel orbit was recovered and the maximum corrector strengths are got.

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TUPTY022

Alternative Optics Design of the CLIC Damping Rings with Variable Dipole Bends and High-field Wigglers

emittance, wiggler, damping, optics

2046

P.S. Papadopoulou, F. Antoniou, Y. Papaphilippou
CERN, Geneva, Switzerland

The CLIC Damping Rings baseline design aims to reach an ultra-low horizontal normalised emittance of 500nm-rad at 2.86GeV, based on the combined effect of TME arc cells and high-field super-conducting damping wigglers, while keeping the ring as compact as possible. In this paper, an alternative design is described, based on TME cells with longitudinally variable bends and an optimized Nb3Sn high-field wiggler. The impact of these changes on ring optics parameters and the associated optimisation steps are detailed taking account the dominant effect of intrabeam scattering.

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TUPTY046

Impact of Beam Losses in the LHC Collimation Regions

collimation, simulation, proton, coupling

2116

E. Skordis, R. Bruce, F. Cerutti, A. Ferrari, P.D. Hermes, A. Lechner, A. Mereghetti, P.G. Ortega, S. Redaelli, V. Vlachoudis
CERN, Geneva, Switzerland

The upgrade of the LHC energy and brightness, from the 2015 restart at close to design energy until the HL-LHC era with considerable hardware development and layout renewal, poses tight challenges in terms of machine protection. The collimation insertions and especially the one dedicated to betatron cleaning (IR7), where most of the beam halo is intercepted to spare from losses the cold sectors of the ring, will be subject to a significant increase of radiation load, whose leakage to the nearby dispersion suppressors must be kept sustainable. The past LHC run, while displaying a remarkable performance of the collimation system, offered the opportunity for a demanding benchmarking of the complex simulation chain describing the beam losses and the macroscopic effects of the induced particle showers, this way strengthening the confidence in the reliability of its predictions. This paper discusses the adopted calculation strategy and its evolution options, showing the accuracy achieved with respect to Beam Loss Monitor measurements in controlled loss scenarios. Expectations at design energy, including lifetime considerations concerning critical elements, will also be presented.

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TUPTY084

Update on the MEIC Electron Collider Ring Design

electron, collider, quadrupole, optics

2236

F. Lin, Y.S. Derbenev, L. Harwood, A. Hutton, V.S. Morozov, F.C. Pilat, Y. Zhang
JLab, Newport News, Virginia, USA
Y. Cai, Y. Nosochkov, M.K. Sullivan, M.-H. Wang, U. Wienands
SLAC, Menlo Park, California, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work also supported by the U.S. DOE Contract No. DE-AC02-76SF00515.
The electron collider ring of the Medium-energy Electron-Ion Collider (MEIC) at Jefferson Lab is designed to accumulate and store a high-current polarized electron beam for collisions with an ion beam. We consider a design of the electron collider ring based on reusing PEP-II components, such as magnets, power supplies, vacuum system, etc. This has the potential to significantly reduce the cost and engineering effort needed to bring the project to fruition. This paper reports on an electron ring optics design considering the balance of PEP-II hardware parameters (such as dipole sagitta, magnet field strengths and acceptable synchrotron radiation power) and electron beam quality in terms of equilibrium emittances.

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TUPWI014

Design of a Superconducting Gantry for Protons

quadrupole, proton, lattice, target

2268

C. Bonțoiu, I. Martel, J. Sanchez-Segovia
University of Huelva, Huelva, Spain
R. Berjillos, J.P.B. Perez
TTI, Santander, Spain

The last decade brought much interest in proton therapy within the medical and accelerator communities. Using normal conducting technology, the high-energy beams required can be handled only with large and heavy magnets which causes prohibitive costs. While lattice design work on a superconducting gantry has been carried out for a decade there is yet no practical implementation. The University of Huelva in collaboration with the Andalusian Foundation for Health Research (FABIS) is currently involved in developing and assembling a prototype for a compact superconducting proton gantry. Magnet design and performance is described along with beam dynamics results for the main gantry arcs and for the final spot scanning system using realistic magnetic field maps thoroughly.

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TUPWI016

Gantry 3: Further Development of the PSI PROSCAN Proton Therapy Facility

controls, proton, cyclotron, coupling

2275

A. Koschik
PSI, Villigen, Villigen, Switzerland
C. Bula, J.P. Duppich, A. Gerbershagen, M. Grossmann, J.M. Schippers, J. Welte
PSI, Villigen, Switzerland

PSI and its Center for Proton Therapy (CPT) is extending its research capabilities in the field of proton therapy and pencil beam scanning technology. Gantry 3 will be an additional treatment room at the PROSCAN facility at PSI, Villigen, Switzerland. It will feature a 360 degree scanning Gantry delivered by Varian Medical Systems. The Gantry design is based on Varian technology, which will be combined with advanced PSI active scanning technology. The further development of fast energy switching as well as precise spot and continuous line scanning irradiation modes are main research topics at the PROSCAN facility. A major challenge with Gantry 3 is the link of the existing PSI PROSCAN system with the Varian PROBEAM system, while retaining the system integrity and high performance level. Additionally, Gantry 3 will be installed and commissioned while keeping the other treatment rooms (Gantry 1, Gantry 2, Optis 2) in full operation. The current development and project status is presented.

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TUPWI031

Status of the MEIC Ion Collider Ring Design

ion, electron, collider, optics

2307

V.S. Morozov, Y.S. Derbenev, L. Harwood, A. Hutton, F. Lin, F.C. Pilat, Y. Zhang
JLab, Newport News, Virginia, USA
Y. Cai, Y. Nosochkov, M.K. Sullivan, M.-H. Wang, U. Wienands
SLAC, Menlo Park, California, USA
J. Gerity, T.L. Mann, P.M. McIntyre, N. Pogue, A. Sattarov
Texas A&M University, College Station, Texas, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported in part by the US DOE Contract No. DE-AC02-76SF00515.
We present an update on the design of the ion collider ring of the Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab. The design is based on the use of super-ferric magnets. It provides the necessary momentum range of 8 to 100 GeV/c for protons and ions, matches the electron collider ring design using PEP-II components, fits readily on the JLab site, offers a straightforward path for a future full-energy upgrade by replacing the magnets with higher-field ones in the same tunnel, and is more cost effective than using presently available current-dominated super-conducting magnets. We describe complete ion collider optics including an independently-designed modular detector region.

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TUPWI045

Consequences of Bounds on Longitudinal Emittance Growth for the Design of Recirculating Linear Accelerators

linac, emittance, quadrupole, collider

2350

J.S. Berg
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Recirculating linear accelerators (RLAs) are a cost-effective method for the acceleration of muons for a muon collider in energy ranges from a couple GeV to a few 10s of GeV. Muon beams generally have longitudinal emittances that are large for the RF frequency that is used, and it is important to limit the growth of that longitudinal emittance. This has particular consequences for the arc design of the RLAs. I estimate the longitudinal emittance growth in an RLA arising from the RF nonlinearity. Given an emittance growth limitation and other design parameters, one can then compute the maximum momentum compaction in the arcs. I describe how to obtain an approximate arc design satisfying these requirements based on the deisgn in Bogacz (2005)*. Longitudinal dynamics also determine the energy spread in the beam, and this has consequences on the transverse phase advance in the linac. This in turn has consequences for the arc design due to the need to match beta functions. I combine these considerations to discuss design parameters for the acceleration of muons for a collider in an RLA from 5 to 63 GeV.
*Bogacz, S. A. 2005. Low energy stages - 'dogbone' muon RLA. Nucl. Phys. B (Proc. Supp.) 149:309-312.

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TUPWI054

9-D Polarized Proton Transport in the MEIC "Figure-8" Collider Ring - First Steps

lattice, polarization, quadrupole, collider

2375

F. Méot
BNL, Upton, Long Island, New York, USA
V.S. Morozov
JLab, Newport News, Virginia, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Spin tracking studies in the MEIC figure-8 collider ion ring are presented, based on a preliminary design of the lattice. They provide numerical illustrations of some of the aspects of the figure-8 concept, including spin-rotator based spin control, and lay out the path towards complete spin tracking simulations.

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WEXB1

Coherent Synchrotron Radiation in Energy Recovery Linacs

FEL, electron, experiment, linac

2387

C.C. Hall, S. Biedron, A.L. Edelen, S.V. Milton
CSU, Fort Collins, Colorado, USA
S.V. Benson, D. Douglas, R. Li, C. Tennant
JLab, Newport News, Virginia, USA
B.E. Carlsten
LANL, Los Alamos, New Mexico, USA

Collective beam effects, including coherent synchrotron radiation (CSR), have been studied on free-electron lasers (FELs). Here we will discuss a particular case of the CSR effects, that in energy-recovery linacs (ERLs). Special consideration is given to these machines because of their high average beam power and the architecture of the machine for energy recovery forces extreme bends. A recent study conducted on the JLab IR FEL looked at how CSR impacts both average energy and the energy spectrum of the beam. Such studies are important, both broadly, to the understanding of CSR and more specifically for a number of proposed ERL projects. A few proposed examples include the MEIC bunched beam cooler ERL design and ERL FELs for potential lithography purposes that would operate in the EUV range.

Slides WEXB1 [16.383 MB]

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WEAB2

Beam and Spin Dynamics for Storage Ring Based EDM Search

simulation, storage-ring, resonance, experiment

2454

A. Lehrach
FZJ, Jülich, Germany

Funding: On behalf of the JEDI collaboration and JARA-FAME (Jülich Aachen Research Alliance)
Permanent EDMs (electric dipole moment) of fundamental particles violate both time invariance T and parity P. Assuming the CPT theorem this implies CP violation. The Standard Model (SM) predicts non-vanishing EDMs, their magnitudes, however, are expected to be unobservably small with current techniques. Hence, the discovery of a non-zero EDM would be a signal for “new physics”. As a first step towards EDM searches of charged particles in storage rings, R&D work at the Cooler Synchrotron COSY is pursued. On a longer time scale, the design and construction of a dedicated storage ring will be carried out. Spin-tracking simulations are absolutely crucial to explore the feasibility of the planned storage ring EDM experiments and to investigate systematic limitations. For a detailed study during the storage and buildup of the EDM signal, one needs to track a large sample of particles for billions of turns. Benchmarking experiments are performed at the Cooler Synchrotron COSY to check and to further improve the simulation tools and prototype accelerator components are tested. Finally, the layout of a dedicated storage ring has to be optimized by a full simulation of spin motion.

Slides WEAB2 [1.459 MB]

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WEBB2

First Considerations on Beam Optics and Lattice Design for the Future Hadron-Hadron Collider FCC-hh

quadrupole, optics, injection, collider

2466

B. Dalena
CEA/IRFU, Gif-sur-Yvette, France
R. Alemany-Fernández, B.J. Holzer, D. Schulte
CERN, Geneva, Switzerland
A. Chancé, J. Payet
CEA, Gif-sur-Yvette, France

The main emphasis of the Future Circular Collider study is the design of a 100~TeV proton-proton collider in a new tunnel of about 100 km circumference. This paper presents the first optics design of the future hadron collider (FCC-hh). The basic layout follows a quasi-circular geometry ‘‘quasi racetrack'' with 8 arcs and 8 straight sections, four of which designed as interaction points. Assuming 16~T dipole magnets, a first version of the ring geometry and magnet lattice is presented, including the optics of the foreseen high luminosity regions and of the other straight sections dedicated to the installation of injection/extraction lines, beam dump etc., and an arc structure with optimized dipole fill factor to reach the target center-of-mass energy of 100~TeV.

Slides WEBB2 [4.622 MB]

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WEPWA013

A Transport Beamline Solution for Laser-Driven Proton Beams

laser, proton, simulation, quadrupole

2515

A. Tramontana, G. Candiano, G.A.P. Cirrone, M. Costa, G. Cuttone, G. Gallo, R. Leanza, R. Manna, V. Marchese, G. Milluzzo, G. Petringa, D. Rizzo, F. Romano, S. Salamone, F. Schillaci, V. Scuderi
INFN/LNS, Catania, Italy
M. Maggiore
INFN/LNL, Legnaro (PD), Italy
V. Scuderi
ELI-BEAMS, Prague, Czech Republic

Laser-target interaction represents a very promising field in several potential applications, from nuclear physics to medicine. On the other hand optically accelerated particle beams are characterized by some extreme features, often not suitable for several applications, as an high peak current, a poor shot-to-shot reproducibility and a wide energy and angular distribution. Therefore many efforts are currently ongoing for the development of specific beam transport devices in order to obtain controlled and reproducible output beams. In this framework, this work want to report about a transport beamline solution dedicated to laser-driven beams and made of two main sections: a quadrupole-focusing device and an energy selector system. A test beam-line consisting of prototypes has been realised at INFN-LNS (National Institute of Physics-South National Laboratories, Ct, I) and partially tested with conventional accelerated proton beams. Moreover, some of these prototypes have been already tested with laser-driven beams.\ Several simulations have been also performed using the Geant4 Monte Carlo toolkit, in order to best exploit the beamline potentiality. Preliminary simulations of a transported beamline to select 5 MeV and 24 MeV proton beams are here reported.

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WEPWA034

High-charge-short-bunch Operation Possibility at Argonne Wakefield Accelerator Facility

emittance, linac, wakefield, simulation

2572

G. Ha, M.-H. Cho, W. Namkung
POSTECH, Pohang, Kyungbuk, Republic of Korea
W. Gai, G. Ha, K.-J. Kim, J.G. Power
ANL, Argonne, Illinois, USA

Originally the drive beam line at Argonne Wakefield Accelerator (AWA) Facility was designed to generate the high charge bunch train. However, we recently installed the double dog-leg type emittance exchange beam line which have two identical dog-leg structures. With this beam line, it is possible to compress the bunch by introducing the chicane or using single dog-leg. Simulation studies have been carried out to confirm the minimum bunch length for each charge and the emittance growth by the coherent synchrotron radiation. We present GPT simulation results to show high-charge-short-bunch operation possibility at AWA facility.

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WEPWA035

Initial EEX-based Bunch Shaping Experiment Results at the Argonne Wakefield Accelerator Facility

experiment, simulation, cavity, emittance

2575

G. Ha, M.-H. Cho, W. Namkung
POSTECH, Pohang, Kyungbuk, Republic of Korea
M.E. Conde, D.S. Doran, W. Gai, G. Ha, C.-J. Jing, K.-J. Kim, W. Liu, J.G. Power, Y.-E. Sun, C. Whiteford, E.E. Wisniewski, A. Zholents
ANL, Argonne, Illinois, USA
C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio, USA
P. Piot
Fermilab, Batavia, Illinois, USA

Funding: This work is partly supported by POSTECH BK²¹⁺ and Argonne National Laboratory
A program is under development at Argonne National Laboratory to use an emittance exchange (EEX) beamline to perform longitudinal bunch shaping (LBS). The double dog-leg EEX beamline was recently installed at the Argonne Wakefield Accelerator (AWA) and the goals of the proof-of-principle experiment are to demonstrate LBS and characterize its deformations from the ideal shape due to higher-order and collective effects. The LBS beamline at the AWA consists of insert-able transverse masks mounted on an actuator and four quadrupoles (to manipulate the transverse phase space) before the EEX beamline, which consists of two identical dog-legs and a deflecting cavity. The mask and input beam parameters are varied during the experiment to explore the shaping capability and clarify the deformation sources and their mitigation. Progress on the commissioning of the LBS beamline, initial experimental data and benchmarks to GPT simulations will be presented.

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WEPWA039

The AWAKE Electron Primary Beam Line

electron, proton, plasma, wakefield

2584

J.S. Schmidt, J. Bauche, B. Biskup, C. Bracco, E. Bravin, S. Döbert, M.A. Fraser, B. Goddard, E. Gschwendtner, L.K. Jensen, O.R. Jones, S. Mazzoni, M. Meddahi, A.V. Petrenko, F.M. Velotti, A.S. Vorozhtsov
CERN, Geneva, Switzerland
U. Dorda
DESY, Hamburg, Germany
L. Merminga, V.A. Verzilov
TRIUMF, Vancouver, Canada
P. Muggli
MPI, Muenchen, Germany

The AWAKE project at CERN is planned to study proton driven plasma wakefield acceleration. The proton beam from the SPS will be used in order to drive wakefields in a 10 m long Rb plasma cell. In the first phase of this experiment, scheduled in 2016, the self-modulation of the proton beam in the plasma will be studied in detail, while in the second phase an external electron beam will be injected into the plasma wakefield to probe the acceleration process. The installation of AWAKE in the former CNGS experimental area and the required optics flexibility define the tight boundary conditions to be fulfilled by the electron beam line design. The transport of low energy (10-20 MeV) bunches of 1.25·10⁹ electrons and the synchronous copropagation with much higher intensity proton bunches (3E11) determines several technological and operational challenges for the magnets and the beam diagnostics. The current status of the electron line layout and the associated equipments are presented in this paper.

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WEPWA045

Development of a Spectrometer for Proton Driven Plasma Wakefield Accelerated Electrons at AWAKE

plasma, electron, proton, simulation

2601

L.C. Deacon, S. Jolly, F. Keeble, M. Wing
UCL, London, United Kingdom
B. Biskup
Czech Technical University, Prague 6, Czech Republic
B. Biskup, E. Bravin, A.V. Petrenko
CERN, Geneva, Switzerland
M. Wing
DESY, Hamburg, Germany
M. Wing
University of Hamburg, Hamburg, Germany

The AWAKE experiment is to be constructed at the CERN Neutrinos to Gran Sasso facility (CNGS). This will be the first experiment to demonstrate proton-driven plasma wakefield acceleration. The 400 GeV proton beam from the CERN SPS will excite a wakefield in a plasma cell several metres in length. To observe the plasma wakefield, electrons of 10–20 MeV will be injected into the wakefield following the head of the proton beam. Simulations indicate that electrons will be accelerated to GeV energies by the plasma wakefield. The AWAKE spectrometer is intended to measure both the peak energy and energy spread of these accelerated electrons. Improvements to the baseline design are presented, with an alternative dipole magnet and quadrupole focussing, with the resulting energy resolution calculated for various scenarios. The signal to background ratio due to the interaction of the SPS protons with upstream beam line components is calculated, and CCD camera location, shielding and light transport are considered.

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WEPJE006

Dielectric Wakefield Accelerator Experiments at ATF

wakefield, experiment, electron, controls

2681

D.Y. Shchegolkov, E.I. Simakov
LANL, Los Alamos, New Mexico, USA
S.P. Antipov
Euclid TechLabs, LLC, Solon, Ohio, USA
M.G. Fedurin
BNL, Upton, Long Island, New York, USA

Funding: This work is supported by the U.S. Department of Energy through the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory.
Dielectric wakefield acceleration (DWA) presents us with means to achieve the accelerating gradient high above the limits of conventional accelerators. In a typical DWA scheme a higher energy lower charge main bunch is accelerated in the wakefield produced by a preceding lower energy higher charge drive bunch inside of a hollow metal-encapsulated dielectric tube. To make use of as much energy of the drive bunch as possible, it is highly important that all parts of it decelerate uniformly. Close to uniform drive bunch deceleration can be achieved if its current is properly shaped.* At Accelerator Test Facility (ATF) at BNL we shaped the current of a chirped electron beam with an adjustable mask placed inside of the highly dispersive region in the magnetic dogleg. We passed the shaped beam current through a quartz tube and observed the beam particles’ energy modulation at the tube’s output with a spectrometer. By tuning the mask we were able to control the beam energy modulation and thus the wakefield profile in the tube.
* B. Jiang, C. Jing, P. Schoessow, J. Power, and W. Gai, PRSTAB 15, 011301 (2012).

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WEPJE007

Simulation Studies of BBU Suppression Methods and Acceptable Tolerances in Dielectric Wakefield Accelerators

wakefield, quadrupole, lattice, simulation

2685

D.Y. Shchegolkov, E.I. Simakov
LANL, Los Alamos, New Mexico, USA
A. Zholents
ANL, Argonne, Illinois, USA

Funding: This work is supported by the U.S. Department of Energy through the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory.
The advantage of dielectric wakefield accelerators (DWAs) is the ability to achieve accelerating gradients well above the limits of conventional accelerators. However DWAs will also produce high transverse wakefields if the beam propagates off-center, which grow even faster than the accelerating gradient when the width of the beam channel is decreased.* It is highly important to suppress single beam breakup (BBU) instability in order for the beam to propagate long enough so that a reasonable amount of energy (e.g., 80%) from the drive bunch is extracted. In addition bending of the dielectric channel has a similar effect to off-center steering of the beam with the required tolerances on the channel straightness typically in a few micron range. For both rectangular and circular dielectric lined waveguides we use a FODO lattice with a tapered strength for suppression of BBU. We impose initial energy chirp on the drive beam to make use of the BNS damping. We change rectangular waveguide orientation by 90 degrees with a small step to make use of the quadrupole wakefield focusing. These and other techniques and tolerance requirements are discussed and simulation results are presented in this presentation.
* C. Li, W. Gai, C. Jing, J.G. Power, C.X. Tang, and A. Zholents, High gradient limits due to single bunch beam breakup in a collinear dielectric wakefield accelerator, PRSTAB 17, 091302 (2014).

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WEPMA003

Vacuum System Design for the Sirius Storage Ring

vacuum, radiation, storage-ring, synchrotron

2744

R.M. Seraphim, O.R. Bagnato, R.O. Ferraz, H.G. Filho, G.R. Gomes, M. Nardin, R.F. Oliveira, B.M. Ramos, A.R.D. Rodrigues, M.B. Silva, T.M. da Rocha
LNLS, Campinas, Brazil

Sirius is a 3 GeV 4th-generation light source under construction by the Brazilian Synchrotron Light Laboratory (LNLS). Sirius will have a low emittance storage ring, 0.28 nm-rad, based on 20 cells of a highly compact lattice – 5-bend achromat (5BA). This lattice concept leaves very little space for components and therefore requires narrow vacuum chambers with tight mechanical tolerances. Most of the storage ring vacuum chambers will be made of OFS copper and have a circular cross section with inner diameter of 24 mm and a wall thickness of 1 mm. The unused synchrotron radiation will be distributed along the water cooled walls of the chambers. Due to the small conductance of the chambers, the vacuum pumping will be based on distributed concept and then non-evaporable getter (NEG) coating will be extensively used, with more than 95% of the chambers being coated. In this paper, we present an overview of the storage ring vacuum system and the main vacuum chambers fabrication developments.

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WEPMA015

Water-cooled Thin Walled Beam Pipes of the Fast Ramping Storage Ring ELSA

radiation, synchrotron, electron, synchrotron-radiation

2780

P. Hänisch, W. Hillert, B. Neff
ELSA, Bonn, Germany

At the Electron Stretcher Facility ELSA of Bonn University thin walled beam pipes are in use to reduce eddy current loss to a minimum. The operation of the accelerator places high demands on the beam pipes like static stress because of the inner vacuum and additional one-sided thermal stress caused by synchrotron radiation. A first generation of thin walled beam pipes had been developed and manufactured during the construction of the stretcher ring in 1985. These pipes were successfully in operating stage the following ten years. The beam pipes had a wall thickness of 0.3mm, a length of 3m, and a bending radius of ca. 10.5m. Special pipes with a sideway branch for synchrotron radiation experiments have been manufactured in the same assembly dimension. In the course of an intensity upgrade, a second generation of beam pipes has been developed in 1995. To reduce the thermal stress caused by the synchrotron radiation an internal water cooling was mounted. In this contribution the design and manufacturing principles of the thin walled beam pipes with water cooling are presented.

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WEPMA019

Status of the Super-FRS Magnet Devlopment for Fair

quadrupole, status, cryogenics, octupole

2792

H. Müller, E.S. Fischer, H. Leibrock, P. Schnizer, M. Winkler
GSI, Darmstadt, Germany
J.-E. Munoz-Garcia, L. Quettier
CEA/IRFU, Gif-sur-Yvette, France
L. Serio
CERN, Geneva, Switzerland

The Super FRS is a two-stage in flight separator to be built next to the site of GSI, Darmstadt, Germany as part of FAIR (Facility for Anti-proton and Ion Research). Its purpose is to create and separate rare isotope beams and to enable the mass measurement also for very short lived nuclei. Due to its three branches a wide variety of experiments can be carried out in frame of the NUSTAR collaboration. Due to the large acceptance needed, the magnets of the Super-FRS have to have a large aperture and therefore only a superconducting solution is feasible. A superferric design with superconducting coils was chosen in which the magnetic field is shaped by an iron yoke. We will present the actual design status of the dipole- and multipole magnets as well as the status of the development of the dedicated test facility at CERN.

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WEPMA020

SIS100 Dipole Field Harmonics and Dynamic Aperture Calculations

multipole, quadrupole, simulation, synchrotron

2795

C. Omet, E.S. Fischer, G. Franchetti, V. Kornilov, A. Mierau, C. Roux, P. Schnizer, D. Schäfer, S. Sorge, P.J. Spiller, K. Sugita
GSI, Darmstadt, Germany

During the acceptance test of the First of Series (FoS) SIS100 super-ferric dipole, detailed field measurements have been done. The harmonic coefficients have been extracted from these and dynamic aperture simulations have been done which are presented here. Furthermore, geometric precision measurement tools for the magnet have been developed to track down the field errors to geometric errors. Finally, mitigation actions have been taken to reduce these errors during manufacturing to ensure the design beam survival rate in SIS100.

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WEPMA023

Advanced Multipoles and Appropriated Measurement Tools for Field Characterization of SIS100 Magnets

multipole, vacuum, superconducting-magnet, ion

2805

P. Schnizer, E.S. Fischer, A. Gottsmann, F. Kaether, A. Mierau, H.G. Weiss
GSI, Darmstadt, Germany
B. Schnizer
TUG/ITP, Graz, Austria

The heavy ion synchrotron SIS100 utilises fast ramped superconducting magnets. Describing and measuring these magnets requires advanced multipoles next to well adapted measurement techniques. We cover briefly the required theory adapted to the measurements, show which designs were available and which decisions had to be taken for measuring curved superconducting magnets. The series of SIS100 dipole magnets is going to be produced. These magnets will be measured at GSI. We present the foreseen field measurement procedure, outline the currently ongoing tests and give our calibration strategy.

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WEPMA034

Bakeout Concept for the HESR at FAIR

vacuum, ion, heavy-ion, controls

2832

H. Jagdfeld, N. Bongers, P. Chaumet, F.M. Esser, F. Jordan, F. Klehr, G. Langenberg, U. Pabst, L. Semke
FZJ, Jülich, Germany

Forschungszentrum Jülich has taken the leadership of a consortium being responsible for the design of the High-Energy Storage Ring (HESR) going to be part of the FAIR project at GSI. The HESR is designed for antiprotons but can be used for heavy ion experiments as well. Therefore the vacuum is expected to be 10^-11 mbar or better. To achieve this also in the curved sections where 44 bent dipole magnets with a length of around 4.5 m will be installed, NEG coated dipole chambers will be used to reach the needed pumping speed and capacity. For activation of the NEG-material a bakeout system must be installed. The bakeout concept including the layout of the control system and the systematization of the heater packages for all components of the vacuum system are presented. Also the special design of the heater jackets inside the dipole will be shown where the geometrical parameters are very critical and space is very limited. The results of the simulation of temperature distribution in the dipole iron are compared to temperature measurements carried out at a testbench with different layouts of the heater jackets. The final design of the dipole heater jackets will be illustrated.

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WEPMA040

Magnet Studies for the Accelerator FLUTE at KIT

experiment, linac, multipole, simulation

2849

S. Hillenbrand, A. Bernhard, A.-S. Müller, M.J. Nasse, R. Rossmanith, R. Ruprecht, M. Sauter, S. Schott, M. Schuh, S. Schulz, M. Weber, P. Wesolowski, C. Widmann
KIT, Karlsruhe, Germany

At KIT we are currently constructing the compact linear accelerator FLUTE (Ferninfrarot Linac Und Test Experiment). This 41 MeV machine is aimed at accelerator physics and synchrotron radiation research, using ultra-short electron bunches. The electrons are generated at a photo-cathode using picosecond long UV laser pulses. A magnetic chicane is used to compress the bunches longitudinally to a few femtoseconds. This contribution describes both the magnet design, in particular the optimization of the chicane dipoles based on finite element method (FEM) simulations, as well as the implementation of a magnet measurement system.

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WEPMA049

Development of the Ceramic Chamber Integrated Pulsed Magnet Fitting for a Narrow Gap

power-supply, vacuum, storage-ring, kicker

2879

C. Mitsuda, T. Honiden, N. Kumagai, S. Sasaki
JASRI/SPring-8, Hyogo-ken, Japan
T. Nakanishi
SES, Hyogo-pref., Japan
A. Sasagawa
KYOCERA Corporation, Higashiomi-city, Shiga, Japan

We are pushing forward the development of a pulsed magnet that has a combined structure of magnet coils with a ceramic vacuum chamber, aiming to realize a small gap. The structure we are developing is that single turn air-coils are implanted along the longitudinal axis in the cylindrical ceramic chamber wall with thickness of 5mm. The ceramic wall works for separating the vacuum from the atmosphere, as well as holding the coil structures mechanically and the electrical insulation of coils. By this structure, magnet pole edges can be set close to the inside diameter of the chamber. The small gap increases magnetic field strength, which is for shorter length, and, as a result, the small magnet size reduces the inductance, which is for shorter pulse. We achieved the continuous operation over 200 days, without any failure, of current-excitation with 20 kV, 7.7 kA pulse with 4-μsec width and repetition of 1 Hz, using the dipole type prototype with a bore radius of 30 mm and magnetic length of 0.3m in 2013, while maintaining the vacuum pressure less than 10^-6 Pa. In this conference, we will discuss about the availability and practical utility with the magnetic field output performance.

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WEPMA050

Permanent Dipole Magnet R&D for SPring-8-II

quadrupole, permanent-magnet, shielding, simulation

2883

T. Taniuchi, T. Aoki, K. Fukami, S. Takano, T. Watanabe
JASRI/SPring-8, Hyogo-ken, Japan

Permanent magnets are promising for future light source machines with its compactness, small power consumption. We have proposed a variable-field permanent dipole magnet and demonstrated its performance*. Following the result, a prototype magnet with a longitudinal field gradient and a magnetic shunt circuit was designed and fabricated. The longitudinal field gradient enables a lower beam emittance and the magnetic shunt circuit improves a temperature stability of the magnetic field strength. Simulation studies and measurement results are presented in this report. The interference of magnetic fields between neighboring magnets was also investigated.
* T. Watanabe et al., Proc. of IPAC 2014.

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WEPMA051

Superconducting Solenoid Package Prototyping for FRIB SRF Linac

solenoid, operation, linac, SRF

2886

K. Hosoyama, K. Akai, S. Yamaguchi
KEK, Ibaraki, Japan
E.E. Burkhardt, K. Saito, Y. Yamazaki
FRIB, East Lansing, Michigan, USA

Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Coopertive Agreement DESC000661.
FRIB is an under constructing machine in USA for nuclear physics, which has intensity front SRF linacs to accelerate ion beam from proton to uranium up to 200 MeV/u. FRIB has large users community, so the machine has to be operated very reliably and stably. Superconducting solenoid and steering dipoles as a package is mounted in the cryomodule nearby SRF cavities to focus beam strongly and space effectively. This produces an issue interacting between the fringe field from the solenoid and the SRF cavity, which makes potential performance degradation on SRF cavity. NbTi superconducting wire is utilized for the solenoid package. The high field design like 9T is very critical operation due to the SC characteristics of the wire. The solenoid package has to be designed very carefully. In this paper will report the prototyping of 25 cm 8T solenoid package for FRIB cryomodule, which includes design, fabrication, and cold test.
* This work has been done under the collaboration between KEK and MSU.

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WEPMA057

Development of HTS magnets

neutron, cyclotron, target, ion

2905

K. Hatanaka, M. Fukuda, K. Kamakura, T. Saito, H. Ueda, Y. Yasuda, T. Yorita
RCNP, Osaka, Japan

We have been developing magnets utilizing high-temperature superconducting (HTS) wires for this decade. We built three model magnets, a mirror coil for an ECR ion source, a set of coils for a scanning magnet and a super-ferric dipole magnet to generate magnetic field of 3 T. They were excited with AC/pulse currents as well as DC currents. Recently we fabricated a cylindrical magnet for a practical use which polarizes ultracold neutrons (UCN). It consists of 10 double pancakes and the field strength at the center is higher than 3.5 T which is required to fully polarize 210 neV neutrons. It was successfully cooled and excited. The magnet was used to polarized UCN generated by the RCNP-KEK superthermal UCN source, One dipole magnet has been manufactured which is used as a switching magnet after the RCNP ring cyclotron and is excited by pulse currents. It becomes possible to deliver beams to two experimental halls by time sharing. Their designs and performances are presented in the talk.

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WEPMN003

The Magnetic Measurement for Low Magnetic Field Stability of Dipole Magnet for CEPC

collimation, positron, collider, electron

2917

Z. Zhang, F.S. Chen, H. Geng, B. Yin
IHEP, Beijing, People's Republic of China

The CEPC (China Electron-Positron Collider) project is in the pre-research stage. When the beam energy of booster is 120 GeV, the magnetic field of deflection magnet is 640 G. In order to save funds for scientific research, we are ready to select the injection energy for 6 GeV, this corresponds to a magnetic field about 32 G. In such a low magnetic field, the effects of earth's magnetic field and ambient temperature variations cannot be ignored. In this paper, first written the collection procedures for magnetic field value and ambient temperature values by Labview software, then used a one-dimensional probe to measure the background magnetic field for three directions (Bx, By, Bz) and the value of the ambient temperature values, the time of data collection for each direction are more than 24 hours (every minute collecting a set of values). Finally, plus the different currents (3A, 6A.. 15A) to the dipole magnet, the time of measured and the data collected by over 24 hours. Based on the results of the analysis of large amounts of data, summarized and analyzed the effect of Earth's magnetic field and ambient temperature for dipole magnet in a low magnetic field.

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WEPMN004

Progress on the CSNS Power Supply System

power-supply, controls, network, proton

2921

X. Qi, H. Geng
IHEP, Beijing, People's Republic of China

The 1.6 GeV proton synchrotron proposed in the CSNS Project is a 25 Hz rapid-cycling synchrotron (RCS) with injection energy of 80 MeV. Beam power is aimed to 100 kW at 1.6 GeV. The power supply system consists of seven subsystems. Those power supplies have three operation modes: DC mode, AC plus DC mode and programmable pulse mode. This paper will introduce the Power supply system status in recent years.
Power Supply, rapid-cycling synchrotron, serial resonant network

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WEPMN026

Development of Non-resonant Perturbing Method for Tuning Traveling Wave Deflecting Structures

simulation, cavity, network, higher-order-mode

2985

J.H. Tan, W. Fang, Q. Gu, Z.T. Zhao
SINAP, Shanghai, People's Republic of China
D.C. Tong
TUB, Beijing, People's Republic of China

For traveling wave accelerating structures, the tuning method assisted by bead pull technique based on non-resonant perturbation field distribution measurement has been widely used. Long periodic traveling wave deflecting structure, which operating at HEM11 mode, is difficult to use non-resonant perturbation method, and a improved method has been developed for measuring and tuning by "cage" type perturbing object at SINAP. The measurements on x-band traveling wave deflecting structure are presented in this paper.

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WEPMN041

Technical Overview of Bunch Compressor System for PAL XFEL

quadrupole, vacuum, diagnostics, electron

3018

H.-G. Lee, Y.-G. Jung, H.-S. Kang, D.E. Kim, K.W. Kim, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh, Y.J. Suh
PAL, Pohang, Kyungbuk, Republic of Korea

Pohang Accelerator Laboratory (PAL) is developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. Bunch compressor (BC) systems are developed to be used for the linear accelerator tunnel. It consists of three hard X-ray line and one soft X-ray line. BC systems are composed of four dipole magnets, three quadrupole magnet, BPM and collimator. The support system is based on an asymmetric four-dipole magnet chicane in which asymmetry can be optimized. This flexibility is achieved by allowing the middle two dipole magnets to move transversely. In this paper, we describe the design of the stages used for precise movement of the bunch compressor magnets and associated diagnostics components.

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WEPMN046

Compassion of Higher Order Modes Damping Techniques for Superconducting 9-Cell Structure

HOM, damping, quadrupole, cavity

3030

Ya.V. Shashkov, A.A. Mitrofanov, N.P. Sobenin
MEPhI, Moscow, Russia
V. Zvyagintsev
TRIUMF, Vancouver, Canada

Funding: Work supported by Ministry of Education and Science grant 3.245.2014/r
Modern types of accelerators, such as Energy recovery linacs, require low values of higher order modes (HOM) Qext. In accelerators with high current HOM could lead to high losses for the modes excitation, beam instability and beam break up. HOM couplers and waveguides are often used in such structures for HOM damping. Unfortunately they could lead to a violation of the axial symmetry of the accelerating field and negatively affect the beam emittance. Also these devices are subject for multipactor discharge and could be difficult in maintaining and fabrication. In this paper we examine several ways of HOM damping with ridged, fluted and corrugated drift tubes which are devoid of the above-mentioned drawbacks. The influence of the parameters of the drift tube on the HOM damping and on the parameters of the fundamental wave were analyzed.
Higher order modes, ERL, SRF

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WEPMN051

Design of a Superconducting Gantry Cryostat

quadrupole, proton, vacuum, cryogenics

3043

C. Bonțoiu, I. Martel, J. Sanchez-Segovia
University of Huelva, Huelva, Spain
R. Berjillos, J.P.B. Perez
TTI, Santander, Spain

The University of Huelva in collaboration with the Andalusian Foundation for Health Research (FABIS) and the TTI Company is currently involved in developing and assembling a prototype for a compact superconducting proton gantry with the goal to generate a business case within the narrow niche of hadron therapy. This article presents the current status of the engineering design for the cryostat and beam steering system. An account for the mechanical deformations due to magnetic forces and weight is also presented.

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WEPMN059

Design Study and Construction of a Transverse Beam Halo Collimation System for ATF2

wakefield, simulation, collimation, background

3062

N. Fuster-Martínez, A. Faus-Golfe
IFIC, Valencia, Spain
P. Bambade, S. Liu, S. Wallon
LAL, Orsay, France
K. Kubo, T. Okugi, T. Tauchi, N. Terunuma
KEK, Ibaraki, Japan
I. Podadera, F. Toral
CIEMAT, Madrid, Spain

Funding: Work supported by IDC-20121074, FPA2013-47883-C2-1-P and ANR-11-IDEX-0003-02
The feasibility and efficiency of a transverse beam halo collimation system for reducing the background in the ATF2 beamline has been studied in simulations. In this paper the design and construction of a retractable transverse beam halo collimator device is presented. The wakefield induced-impact of a realistic mechanical prototype has been studied with CST PS, as well as the wakefield beam dynamics impact by using the tracking code PLACET.

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WEPMN062

MAX IV 3 GeV Storage Ring Magnet Block Production Series Measurement Results

storage-ring, sextupole, synchrotron, octupole

3069

M.A.G. Johansson, L.-J. Lindgren, M. Sjöström, P.F. Tavares
MAX-lab, Lund, Sweden

The magnet design of the MAX IV 3 GeV storage ring replaces the conventional support girder + discrete magnets scheme of previous third-generation synchrotron radiation light sources with a compact (Ø25 mm aperture) integrated design having several consecutive magnet elements precision-machined out of a common solid iron block, with mechanical tolerances of ±0.02 mm over the 2.3–3.4 m block length. The production series of 140 integrated magnet block units, which was totally outsourced to industry, was completed mid-2014, with mechanical/magnetic QA conforming to specifications. This article presents mechanical and magnetic field measurement results of the full production series.

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WEPMN066

Hall Probe Measurements of 80 Unit Cell Magnets for the MAX-IV Storage Ring

storage-ring, quadrupole, synchrotron, alignment

3076

A.A.F. Ahl
Scanditronix Magnet AB, Vislanda, Sweden

80 unit cell magnet segments have been manufactured by Scanditronix Magnet for the 3 GeV storage ring at MAX-IV in Lund, Sweden. All of the magnets have been approved by Max-lab after a large field measuring campaign using both a high precision hall probe bench, as well as a new rotating coil system. Each unit cell magnet consists of one dipole, two quadrupole, three sextupole and one vertical and one horizontal corrector magnets. The hall probe bench was used to measure the dipole magnet (with combined dipole and quadrupole component) as well as the quadrupole magnets. This poster will focus on the hall probe measurements performed on the dipole magnets from the perspective of a manufacturer. E.g. the repeatability of the measurements and the relation between field performance and mechanical tolerances will be analyzed.

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WEPMN071

Enhanced Diagnostic Systems for the Supervision of the Superconducting Circuits of the LHC

operation, diagnostics, hardware, controls

3090

R. Denz, Z. Charifoulline, K. Dahlerup-Petersen, A.P. Siemko, J. Steckert
CERN, Geneva, Switzerland

Being an integral part of the protection system for the superconducting circuits of the LHC, the data acquisition systems used for the circuit supervision underwent a substantial upgrade during the first long shutdown of the LHC. The sampling rates and resolution of most of the acquired signals increased significantly. Newly added measurements channels like for the supervision of the quench heater circuits of the LHC main dipoles allow identifying specific fault states. All LHC main circuits are meanwhile equipped with earth voltage feelers allowing monitoring the electrical insulation strength, especially during the fast discharges. The protection system for the bus-bar splices is now capable to operate in different modes. By this measure, it is possible fulfilling the requirements for different specific tests like the warm bus-bar measurements and current stabilizer continuity measurements (CSCM) without field interventions.

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WEPHA010

The Vacuum System of the Extra-Low Energy Antiproton Decelerator ELENA at CERN

vacuum, antiproton, ion, electron

3119

R. Kersevan
CERN, Geneva, Switzerland

The Extra-Low ENergy Antiproton decelerator (ELENA) project is under way since 2011. In the past 3 years, it has considerably evolved into a detailed design for the ring and the transfer lines. It is a small machine, ~30 m in circumference, with a rather tight specification for the average pressure seen by the anti-proton beams injected by the anti-proton decelerator (AD). The average pressure in ELENA must be limited to 4x10^-12 mbar (H2-equivalent) in order to limit the charge-exchange losses during the rather long deceleration process (several tens of seconds), during which the energy of the beam is reduced and the electron-cooler is used twice in order to decrease the transverse emittance of the anti-proton beam. This paper will discuss the design of the chambers of the injection line, extraction line and the ring. It will also mention the actual status of the vacuum system for the transfer lines to the experiments, LNE, which are under finalisation. The results of detailed 3D simulations made with the test-particle montecarlo code Molflow+ will be discussed, alongside with the choice for the pumping system, mainly distributed NEG-coatings and integrated NEG/ion-pumps.

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WEPHA017

Qualification of the Bypass Continuity of the Main Dipole Magnet Circuits of the LHC

operation, controls, experiment, cryogenics

3141

S. Rowan, B. Auchmann, K. Brodzinski, Z. Charifoulline, B.I. Panev, F. Rodriguez-Mateos, I. Romera, R. Schmidt, A.P. Siemko, J. Steckert, H. Thiesen, A.P. Verweij, G.P. Willering
CERN, Geneva, Switzerland
H. Pfeffer
Fermilab, Batavia, Illinois, USA

The copper-stabilizer continuity measurement (CSCM) was devised in order to attain complete electrical qualification of all busbar joints, lyres, and the magnet bypass connections in the 13~kA circuits of the LHC. A CSCM is carried out at 20 K, i.e., just above the critical temperature, with resistive magnets. The circuit is then subject to an incremental series of controlled powering cycles, ultimately mimicking the decay from nominal current in the event of a magnet quench. A type test to prove the validity of such a procedure was carried out with success in April 2013, leading to the scheduling of a CSCM on all main dipole circuits up to and including 11.1 kA, i.e., the current equivalent of 6.5 TeV operation. This paper details the procedure, with respect to the type test, as well as the results and analyses of the LHC-wide qualification campaign.

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WEPHA037

DESIGN STORAGE RING AND BOOSTER RING POWER SUPPLY CABLING IN TAIWAN PHOTON SOURCE

booster, power-supply, storage-ring, quadrupole

3194

Y.S. Wong, Y.-C. Chien, C.Y. Liu, K.-B. Liu, B.S. Wang
NSRRC, Hsinchu, Taiwan

For this paper is studies the storage ring and booster ring power supply cabling design, Papers can be divided into cabling design, control and instrument area construction (CIA), and testing; design including estimated cable length and arrangement, the CIA construction part site of the cable erection and overcome barriers of space; detection section is high resistance meter and insulation testing. Circumference of booster ring is 496.8 meter and storage ring is 518.4 meter, TPS (Taiwan Photon Source) beam current is 500mA at 3GeV. Booster Ring dipole into BD and BH series 54 magnets, cable size is 250 mm2 and total length of 5000m. Booster Ring and storage ring quadrupole 150 magnets and cable size 250 mm2, total length of 17000m. Storing Ring dipole 48 magnets cable size 325 mm2, total length of 6000m. On the positive and negative voltage cables will produce magnetic interference effects generated through cabling overlapped technology eliminates magnetic interference. Finally, using a high-impedance machine to detect cabling insulation effect. TPS power supply to the energy transfer is to ensure safe and correct magnet.

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WEPHA038

Upgrading the Performance of the Power Supply for the TPS Booster Dipole Magnets

power-supply, booster, controls, injection

3197

C.Y. Liu, Y.-C. Chien, K.-B. Liu, B.S. Wang, Y.S. Wong
NSRRC, Hsinchu, Taiwan

The performance of the power supply for the dipole magnet is important for the TPS booster ring. The output current of the power supply follows the beam current from 150 MeV ramping to 3 GeV. The frequency of the power supply is 3 Hz. The power supply must thus push enormous energy into the dipole magnets at +1000 V and +1000 A, and can handle this job. Because the TPS booster dipole supply is bipolar and the voltage is large, the lodged capacitors have large effects that produce common-mode high-frequency current noise, which drives the power supply beyond specification. The TPS booster ring hence fails to meet the dc and ramping specification. We designed a common-mode filter to solve the high-frequency current noise by absorbing the current noise from the path of the lodged capacitors to the ground pad. The TPS booster dipole supply thus works within the specification when the power supply is in the dc or ramping mode. The beam current from the 150- MeV dc mode for the injection mode can ramp the beam current to 3 GeV. This paper reports the excellent results.

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WEPHA040

Status of AC Power Supplies for TPS Booster Ring

booster, power-supply, controls, lattice

3203

Y.-C. Chien, P.C. Chiu, K.T. Hsu, C.Y. Liu, K.-B. Liu, B.S. Wang, Y.S. Wong, C.Y. Wu
NSRRC, Hsinchu, Taiwan

TPS is a third generation 3 GeV synchrotron light source under commission in Taiwan. The TPS Booster ring is concentric ring design sharing the same tunnel with storage ring. The booster ring power supplies are responsible of accelerating the 150 MeV Linac output energy to 3 GeV before the beam is preserved in the storage ring. The booster ring power supplies are required to operate at 3Hz sinusoidal waveform with 1000 A peak current for the dipole magnet. All power supplies' specifications and output performance are demonstrated here in this paper.

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WEPHA049

Demagnetize Booster Chamber in TPS

booster, vacuum, synchrotron, operation

3225

I.C. Sheng, C.-T. Chen, C.K. Kuan, I.C. Yang
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source (TPS) project starts its booster commissioning starts from August 2014. Few issues have been discovered and fixed. Since the booster aperture is relatively small and number of magnets is barely sufficient. Therefore extreme precise control of booster chamber alignment and the corresponding chamber permeability is as well important. In this paper, we present how the booster chamber is uninstalled, demagnetized and reinstalled within three weeks. This procedure is proven to result in the lowest booster chamber permeability in the world and a good high vacuum booster ring is built in 3 weeks.

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WEPTY003

Magnet Designs for the Multi-bend Achromat Lattice at the Advanced Photon Source

quadrupole, sextupole, lattice, magnet-design

3260

M.S. Jaski, J. Liu
ANL, Argonne, Ilinois, USA
D.J. Harding, V.S. Kashikhin, M.L. Lopes
Fermilab, Batavia, Illinois, USA
A.K. Jain, C.J. Spataro
BNL, Upton, Long Island, New York, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source (APS) is currently investigating replacing the existing two-bend 7 GeV lattice with a 6 GeV seven-bend achromat magnet lattice in order to achieve a low electron beam emittance. This new lattice requires 1320 magnets, of which there are nine types. These include high strength quadrupoles (gradient up to ~97 T/m), sextupoles with second derivative of field up to ~7000 T/m2, longitudinal gradient dipoles with field ratio of up to 5, and transverse gradient dipoles with gradients of ~50 T/m and central field of ~0.6 T. These field requirements and the limited space available pose several design challenges. This paper presents a summary of magnet designs for the various magnet types developed through a collaboration of APS with FNAL and BNL.

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WEPTY009

Preservation of Quality Factor of Half Wave Resonator during Quenching in the Presence of Solenoid Field

solenoid, cavity, cryomodule, niobium

3270

S.H. Kim, D.M. Caldwell, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.W.T. MacDonald, P.N. Ostroumov, T. Reid
ANL, Argonne, Illinois, USA

Funding: This work was supported by the U.S. Department of energy, Offices of High-Energy Physics and Nuclear Physics, under Contract No. DE-AC02-76-CH03000 and DE-AC02-06CH11357.
The Proton Improvement Plan II at FNAL relies upon a 162.5 MHz superconducting half-wave resonator cryomodule to accelerate H⁻ beams from 2.1 to 10 MeV. This cryomodule contains 8 resonators with 8 superconducting solenoid magnets interspersed between them. X-Y steering coils are integrated with a package of the superconducting solenoid magnets. The center of the solenoids is located within ~50 cm of the high surface magnetic field of the half-wave resonators and in this study we assess whether or not magnetic flux generated by this magnet is trapped into the half-wave resonators niobium surface and increases the RF losses to liquid helium. To test this we assembled a solenoid with a 162.5 MHz half-wave resonator spaced as they will be in the cryomodule. We measured the quality factor of the cavity before and after the cavity quenched as a function of field level in the coils. No measurable change in the quality factor was observed. In this paper, we will present details of the measurements and discuss the magnetic field map.

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WEPTY019

Transverse Field Perturbation For PIP-II SRF Cavities

quadrupole, cavity, multipole, linac

3302

P. Berrutti, T.N. Khabiboulline, V.A. Lebedev, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

Funding: Work supported by D.O.E. Contract No. DE-AC02-07CH11359
Proton Improvement Plan II (PIP-II) consists in a plan for upgrading the Fermilab proton accelerator complex to a beam power capability of at least 1 MW delivered to the neutrino production target. A room temperature section accelerates H⁻ ions to 2.1 MeV and creates the desired bunch structure for injection into the superconducting (SC) linac. Five cavity types, operating at three different frequencies 162.5, 325 and 650 MHz, provide acceleration to 800 MeV. This paper presents the studies on transverse field perturbation on particle dynamic for all the superconducting cavities in the linac. The effects studied include quadrupole defocusing for coaxial resonators, and dipole kick due to couplers for elliptical cavities. A multipole expansion has been performed for each of the cavity designs including effects up to octupole.

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WEPTY029

Measurements of Strontium Ferrite Hybrid Permanent Magnet Quadrupoles after Removal for the Fermilab NOvA Upgrade in 2012

permanent-magnet, quadrupole, radiation, injection

3331

O. Kiemschies
Fermilab, Batavia, Illinois, USA

Funding: Fermi National Accelerator Laboratory
During the 2012 NOvA upgrade forty strontium ferrite hybrid permanent magnet quadrupoles from the injection, extraction and electron cooling regions of the Recycler accelerator, which had been measured in 2000 and subsequently installed in the tunnel, were replaced. The basic design of the quadrupoles * and expected decay rate ** are described in design documents. Nine of these magnets, of varying strength were measured in 2014. Measurements were made with a modified rotating coil in a fashion similar to their initial pre-installation measurements in 2000. The 2014 measurements are compared to the 2000 measurements and the expected decay. Many of these quadrupoles, as well as other strontium ferrite hybrid permanent magnets are still in operation in the Recycler and tranfer line, so understanding the rate at which the strength changes is significant to the future operation of the Recycler.
* Hybrid Permanent Quadrupoles for the. 8 GeV Transfer Line at Fermilab. (S.M. Pruss et al.)
** Time Evolution of Fields in Strontium Ferrite Permanent Magnets (J. T. Volk et al.)

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WEPTY033

A Concept for a High-field Helical Solenoid

solenoid, operation, beam-cooling, alignment

3345

S. Krave, N. Andreev, R. Bossert, M.L. Lopes, J.C. Tompkins, R. Wands
Fermilab, Batavia, Illinois, USA
G. Flanagan
Muons, Inc, Illinois, USA
K.E. Melconian
Texas A&M University, College Station, Texas, USA

Funding: Fermi Research Alliance under DOE Contract DE-AC02-07CH11359
Helical cooling channels have been proposed for highly efficient 6D muon cooling to produce the required helical solenoidal, dipole, and gradient field components. The channel is divided into sections, each subsequent section with higher field. Simulations have shown that for the high-field sections the use of Nb3Sn superconductor is needed. A continuous winding method and novel stainless steel collaring system has been developed for use in the high field section of a helical cooling channel. Each collar layer is identical, for ease of fabrication, and assembled by both flipping and rotating the subsequent layers. Mechanical and magnetic simulations were performed using a combination of ANSYS and OPERA. The winding and collaring method has been demonstrated on a four coil prototype using a Nb3Sn Rutherford cable. Details of the mechanical design, magnetic modeling, and winding method are presented.

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WEPTY040

Quench Performance of the First Twin-aperture 11 T Dipole for LHC upgrades

magnet-design, status, collimation, detector

3361

A.V. Zlobin, N. Andreev, G. Apollinari, E.Z. Barzi, G. Chlachidze, A. Nobrega, I. Novitski, S. Stoynev, D. Turrioni
Fermilab, Batavia, Illinois, USA
B. Auchmann, S. Izquierdo Bermudez, M. Karppinen, L. Rossi, F. Savary, D. Smekens
CERN, Geneva, Switzerland

Funding: *Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404
The LHC luminosity upgrade plan foresees installation of additional collimators in Dispersion Suppressor areas around point 7 and interaction regions 1, 2 and 5. The required space for these collimators could be provided by replacing some 15-m long 8.33 T NbTi LHC main dipoles (MB) with shorter 11 T Nb3Sn dipoles (MBH) compatible with the LHC lattice and main systems. FNAL and CERN magnet groups are developing a 5.5-m long twin-aperture dipole prototype with the nominal field of 11 T at the LHC nominal current of 11.85 kA suitable for installation in the LHC. Two of these magnets with a collimator in between will replace one MB dipole. The single-aperture 2-m long dipole demonstrator and two 1-m long dipole models have been assembled and tested at FNAL in 2012-2014. The 1 m long collared coils were then assembled into the first twin-aperture Nb3Sn demonstrator dipole and tested. This paper reports test results of the first twin-aperture Nb3Sn dipole model focusing on magnet training, ramp rate sensitivity and temperature dependence of the magnet quench current. The twin-aperture dipole quench performance is compared with the data for the single-aperture models.

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WEPTY041

DESIGN CONCEPT AND PARAMETERS OF A 15 T Nb3Sn DIPOLE DEMONSTRATOR FOR A 100 TEV HADRON COLLIDER

collider, hadron, controls, magnet-design

3365

A.V. Zlobin, N. Andreev, E.Z. Barzi, V.V. Kashikhin, I. Novitski
Fermilab, Batavia, Illinois, USA

Funding: *Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
Hadron Colliders (HC) are the most powerful discovery tools in modern high energy physics. A 100 TeV HC in a ~100 km tunnel with a nominal operation field of ~15 T is being considered for the post-LHC era. The choice of a 15 T nominal field requires using the Nb3Sn technology. Practical demonstration of this field level in an accelerator-quality magnet and substantial reduction of magnet costs are key conditions for the realization of such a machine. FNAL has started the development of a 15 T Nb3Sn dipole demonstrator for a 100 TeV HC. As a first step in this direction, the existing 11 T dipole magnet, developed for LHC upgrades, will be modified by adding two layers to achieve the nominal field of 15 T in a 60 mm aperture. As the next step, to increase the field margin the innermost 2-layer coil will be replaced with an optimized coil using the conductor grading approach. This paper describes the design concept and parameters of the 15 T Nb3Sn dipole demonstrators. Magnetic, mechanical and quench protection issues are discussed.

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WEPTY059

Alternative Methods for Field Corrections in Helical Solenoids

solenoid, beam-cooling, simulation, emittance

3409

K.E. Melconian
Texas A&M University, College Station, Texas, USA
G. Flanagan, S.A. Kahn
Muons, Inc, Illinois, USA
S. Krave, M.L. Lopes, J.C. Tompkins, K. Yonehara
Fermilab, Batavia, Illinois, USA

Funding: Fermi Research Alliance under DOE Contract DE-AC02-07CH11359
Helical cooling channels have been proposed for highly efficient 6D muon cooling. Helical solenoids produce solenoidal, helical dipole, and helical gradient field components. Previous studies explored the geometric tunability limits on these main field components. In this paper we present two alternative correction schemes, tilting the solenoids and the addition of helical lines, to reduce the required strength of the anti-solenoid and add an additional tuning knob.

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WEPTY061

Progress on the Cryogenic and Current Tests of the MSU Cyclotron Gas Stopper Superconducting Magnet

cyclotron, ion, cryogenics, vacuum

3415

M.A. Green, G. Bollen, S. Chouhan, A.F. Zeller
FRIB, East Lansing, Michigan, USA
J. DeKamp, C. Magsig, D.J. Morrissey, J. Ottarson, S. Schwarz
NSCL, East Lansing, Michigan, USA

Funding: This work reported in this paper was supported in part by an NSF grant PHY-0958726
The Michigan State University (MSU) cyclotron gas stopper magnet is a warm iron superconducting cyclotron dipole. The desired field shape is obtained by the pole iron profile. Each coil of the two halves is in a separate cryostat and connected in series through a warm electrical connection. The entire system is mounted on a high voltage platform, and is cooled using six two-stage 4.2 K pulse tube coolers. This paper presents the progress on the magnet fabrication, cooling, and current testing.

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WEPTY064

Thermal-mechanical Analysis of the FRIB Nuclear Fragment Separator Dipole Magnet

radiation, quadrupole, target, cryogenics

3425

S.A. Kahn, A. Dudas, G. Flanagan
Muons, Inc, Illinois, USA
R.C. Gupta
BNL, Upton, Long Island, New York, USA

Funding: This work was supported by the U.S. Department of Energy under Grant DE-SC-0006273
Dipole magnets in the fragment separator region of the Facility for Rare Isotope Beams (FRIB) are critical elements used to select the desired isotopes. These magnets are subjected to high radiation and heat loads. High temperature superconductors (HTS), which have been shown to be radiation resistant and can operate at 40 K where heat removal is substantially more efficient than 4.5 K where conventional superconductors such as NbTi and Nb3Sn operate, are proposed for the coils. The magnet coils carry large current and will be subjected to large Lorentz forces that must be constrained to avoid distortions of the coils. It is desirable to minimize the use of organic materials in the fabrication of this magnet because of the radiation environment. This paper will describe an approach to support the coils to minimize coil deformation and cryogenic heat loss.

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WEPTY065

Quadrupole Magnet for a Rapid Cycling Synchrotron

quadrupole, simulation, synchrotron, acceleration

3428

H. Witte, J.S. Berg
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Rapid Cycling Synchrotrons (RCS) feature interleaved warm and cold dipole magnets; the field of the warm magnets is used to modulate the average bending field depending on the particle energy. It has been shown that RCS can be an attractive option for fast acceleration of particles, for example muons which decay quickly. In previous studies it was demonstrated that in principle warm dipole magnets can be designed which can provide the required ramp rates, which are equivalent to frequencies of about 1 kHz. To reduce the losses it is beneficial to employ two separate materials for the yoke; it was also shown that by employing an optimized excitation coil geometry the eddy current losses are acceptable. In this paper we show that the same principles can be applied to quadrupole magnets targeting 30 T/m with a repetition rate of 1kHz and good field quality.

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WEPTY067

Thermal and Mechanical Analysis of a Waveguide to Coax Symmetric Coupler for Superconducting Cavities

electron, niobium, simulation, cavity

3434

R.G. Eichhorn, J.A. Robbins, V. Veshcherevich
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

As kicks from fundamental power couplers become a concern for low emittance future accelerators, a design for a symmetric coupler for superconducting accelerating cavities has been started. In this coupler, a rectangular waveguide transforms into a coaxial line inside the beam pipe to feed the cavity. So far the RF design revealed an extremely low transversal kick but concerns about cooling and the thermal stability of the coaxial transition line remained. Our contribution will address this. We will calculate heating, heat transfer and thermal stability of this coupler and evaluate the risk of quenching due to particle losses on the coupler.

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WEPWI004

FPC and Hi-Pass Filter HOM Coupler Design for the RF Dipole Crab Cavity for the LHC HiLumi Upgrade

HOM, cavity, coupling, damping

3492

Z. Li
SLAC, Menlo Park, California, USA
S.U. De Silva, J.R. Delayen, R.G. Olave, H. Park
ODU, Norfolk, Virginia, USA

Funding: Work partially supported by the US DOE through the US LHC Accelerator Research Program (LARP), and by US DOE under contract number DE-AC02-76SF00515.
A 400-MHz compact RF dipole (RFD) crab cavity design was jointly developed by Old Dominion University and SLAC under the support of US LARP program for the LHC HiLumi upgrade. The RFD cavity design is consisted of a rounded-square tank and two ridged deflecting poles, operating with a TE11-like dipole mode, which is the lowest mode of the cavity. A prototype RFD cavity is being manufactured and will be tested on the SPS beam line at CERN. The coaxial fundamental Power Coupler (FPC) of the prototype cavity was re-optimized to minimizing the power heating on the coupler internal antenna. A hi-pass filter HOM damping coupler was developed to achieve the required wakefield damping while maintaining a compact size to fit into the beam line space. In this paper, we will discuss the details of the RF optimization and tolerance analyses of the FPC and HOM couplers.

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WEPWI030

Injector Cavities Fabrication, Vertical Test Performance and Primary Cryomodule Design

cavity, cryomodule, HOM, impedance

3551

H. Wang, G. Cheng, W.A. Clemens, G.K. Davis, K. Macha, R.B. Overton, D. Spell
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
After the electromagnetic design * and the mechanical design ** of a β=0.6, 2-cell elliptical SRF cavity, the cavity has been fabricated. Then both 2-cell and 7-cell cavities have been bench tuned to the target values of frequency, coupling external Q and field flatness. After buffer chemistry polishing (BCP) and high pressure rinses (HPR), Vertical 2K cavity test results have been satisfied the specifications and ready for the string assembly. We will report the cavity performance including Lorenz Force Detuning (LFD) and Higher Order Modes (HOM) damping data. Its integration with cavity tuners to the cryomodule design will be reported.
* H. Wang, etc., Proceeding of IPAC2013, Shanghai, China, WEPWO073.
** G. Cheng, etc., Proceeding of PAC2013, Pasadena, CA, WEPAC47.

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WEPWI034

Effects of Crab Cavities' Multipole Content in an Electron-Ion Collider

sextupole, proton, cavity, multipole

3561

A. Castilla, J.R. Delayen, T. Satogata
ODU, Norfolk, Virginia, USA
A. Castilla, J.R. Delayen, V.S. Morozov, T. Satogata
JLab, Newport News, Virginia, USA
A. Castilla
DCI-UG, León, Mexico

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
The impact on the beam dynamics of the Medium Energy Electron-Ion Colider (MEIC) due to the multipole content of the 750 MHz crab cavity was studied using thin multipole elements for 6D phase space particle tracking in ELEGANT. Target values of the sextupole component for the cavity’s field expansion were used to perform preliminary studies on the proton beam stability when compared to the case of pure dipole content of the rf kicks. Finally, important effects on the beam sizes due to non-linear components of the crab cavities’ fields were identified and some criteria for their future study were proposed.

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WEPWI035

Beam Dynamics Studies of 499 MHz Superconducting RF-Dipole Deflecting Cavity System

cavity, emittance, multipole, superconducting-RF

3564

S.U. De Silva, K.E. Deitrick, J.R. Delayen, H. Park
ODU, Norfolk, Virginia, USA

A 499 MHz deflecting cavity has been designed as a three-way beam spreader to separate an electron beam into 3 beams. The rf tests carried out on the superconducting rf-dipole cavity have demonstrated that a transverse voltage of 4.2 MV can be achieved with a single cavity. This paper discusses the beam dynamics on a deflecting structure operating in continuous-wave mode with a relativistic beam. The study includes the analysis on emittance growth, energy spread, and change in bunch size including effects due to field non-uniformities.

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WEPWI036

Design and Prototyping of a 400 MHz RF-dipole Crabbing Cavity for the LHC High-Luminosity Upgrade

cavity, cryomodule, luminosity, HOM

3568

S.U. De Silva, J.R. Delayen, H. Park
ODU, Norfolk, Virginia, USA
Z. Li
SLAC, Menlo Park, California, USA
T.H. Nicol
Fermilab, Batavia, Illinois, USA

LHC High Luminosity Upgrade is in need of two crabbing systems that deflects the beam in both horizontal and vertical planes. The 400 MHz rf-dipole crabbing cavity system is capable of crabbing the proton beam in both planes. At present we are focusing our efforts on a complete crabbing system in the horizontal plane. Prior to LHC installation the crabbing system will be installed for beam test at SPS. The crabbing system consists of two rf-dipole cavities in the cryomodule. This paper discusses the electromagnetic design and mechanical properties of the rf-dipole crabbing system for SPS beam test.

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WEPWI037

Imperfection and Tolerance Analysis of HOM Couplers for ODU/SLAC 400 MHz Crabbing Cavity

HOM, cavity, impedance, luminosity

3572

S.U. De Silva, J.R. Delayen, H. Park
ODU, Norfolk, Virginia, USA
Z. Li
SLAC, Menlo Park, California, USA
R.G. Olave
Old Dominion University, Norfolk, Virginia, USA

In preparation for the LHC High Luminosity upgrade, a 400 MHz crab cavity has been developed jointly at ODU/SLAC, including two higher order mode couplers designed to dampen the wakefields in order to comply with the impedance budget specified for the LHC system. During fabrication, assembly, and processing of the couplers, a number of imperfections may arise that could modify the higher order mode spectrum and the associated impedance for each mode. We present here a detailed study of the imperfections of the horizontal- and vertical- HOM couplers, and the associated allowed tolerances for manufacture, assembly and processing.

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WEPWI053

HTS/lTS Hybrid High Field Superconducting Magnet Designs for the Proposed 100 TeV Proton Colliders

proton, collider, superconductivity, magnet-design

3609

R.C. Gupta, M. Anerella, A.K. Ghosh, W. Sampson, J. Schmalzle
BNL, Upton, Long Island, New York, USA
J. Kolonko, D. Larson, R.M. Scanlan, R.J. Weggel, E. Willen
Particle Beam Lasers, Inc., Northridge, California, USA
C.M. Rey
e2P, Knoxville, USA

Funding: Work supported by Brookhaven Science Associates, LLC under contract Number DE-SC0012704, with the U.S. Department of Energy and STTR contract DOE Grant Number DE-SC0011348.
Proposed proton-proton colliders with a center-of-mass energy up to 100 TeV in a tunnel of desired size require the dipole magnets to be of very high field–20 teslas in some proposals. This field is beyond the limit of present conventional Low Temperature Superconductors (LTS) and requires using High Temperature Superconductors (HTS). The preliminary magnetic design presented in this paper is an HTS/LTS hybrid design with high strength HTS tape used in higher field regions and less expensive LTS in lower field regions, with a goal of optimizing the performance while reducing the cost. A major concern in the magnets built with the HTS tape is the large field errors associated with the conductor magnetization. The strategy presented here aims to reduce those errors considerably. This paper also presents a proof-of-principle design and program to experimentally evaluate that concept.

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THPF012

Status of the High Energy Beam Transport System for FAIR

vacuum, quadrupole, diagnostics, beam-diagnostic

3705

F. Hagenbuck, L.H.J. Bozyk, S. Damjanovic, A. Krämer, B. Merk, C. Mühle, S. Ratschow, B.R. Schlei, P.J. Spiller, B. Walasek-Höhne, H. Welker, C. Will
GSI, Darmstadt, Germany

The overall layout of the High Energy Beam Transport (HEBT) System of the Facility for Antiproton and Ion Research (FAIR)* did not change since its last presentation in 2008**. All necessitated adaptions as for example due to the introduction of the Modularized Start Version (MSV, module 0-3) of FAIR*** could be smoothly implemented. In the meanwhile the HEBT system is in its realisation phase with the procurement of its main components in progress. In the following adaptions of the system layout not yet covered in ** are summarized and an overview of the technical system design and procurement status are presented.
* FAIR Baseline Technical Report (FBTR), GSI 2006
** S. Ratschow et al., Proc. of EPAC08, THPP104, Genoa, Italy (2008)
***FAIR Green Paper - The Modularized Start Version, October 2009

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THPF015

Status of the FAIR Heavy Ion Synchrotron Project SIS100

quadrupole, cryogenics, ion, injection

3715

P.J. Spiller, U. Blell, L.H.J. Bozyk, J. Ceballos Velasco, T. Eisel, E.S. Fischer, O.K. Kester, H.G. König, H. Kollmus, V. Kornilov, P. Kowina, J.P. Meier, A. Mierau, C. Mühle, C. Omet, D. Ondreka, N. Pyka, H.R. Ramakers, P. Rottländer, C. Roux, P. Schnizer, St. Wilfert
GSI, Darmstadt, Germany

The procurements of major technical components for the heavy ion synchrotron SIS100 are progressing. Especially the production of the long lead items, the main superconducting dipole and quadrupole magnets and the main Rf systems could be started. The system layout for the injection system and the specifications for all injection devices has been completed. In parallel, the Digital Mock-Up (DMU) and design for major extraction components has been developed. Certain technical challenges observed during the acceptance tests of First of Series (FOS) components and risks and their mitigation will be presented.

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THPF022

Design of the 325 MHz 4-Rod RFQ for the FAIR Proton Linac

rfq, simulation, operation, higher-order-mode

3733

B. Koubek, H. Podlech, A. Schempp
IAP, Frankfurt am Main, Germany

Investigations on the 325 MHz 4-rod RFQ prototype for the FAIR proton linac have confirmed the feasibility of a 4-rod RFQ to work at frequencies above 300 MHz. This RFQ will accelerate protons from 95 keV to 3 MeV within a length of 3.3 m and will be powered by a 2.5 MW klystron. The mechanical and rf design of this RFQ are presented in this paper.

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THPF023

Massless Beam Separation System for Intense Ion Beams

septum, shielding, beam-transport, vacuum

3736

O. Payir, M. Droba, O. Meusel, D. Noll, U. Ratzinger, P.P. Schneider, C. Wiesner
IAP, Frankfurt am Main, Germany

The ExB chopper* in the Low Energy Beam Transport (LEBT) section of the accelerator-driven neutron source FRANZ** will form the required pulses with a repetition rate of 257 kHz out of the primary 120 keV, 50 mA DC proton beam. A following beam separation system will extract the deflected beam out of the beamline and minimize the thermal load by beam losses in the vacuum chamber. To further avoid an uncontrolled production of secondary particles, a novel massless septum system is designed for the beam separation. The septum system consists of a static C-magnet with optimized pole shapes, which will extract the beam with minimal losses, and a magnetic shielding tube, which will shield the transmitted pulsed beam from the fringing field of the dipole. The magnetic field and the beam transport properties of the system were numerically investigated. A main deflection field of about 250 mT was achieved, whereas the fringing field was reduced to below 0.3 mT on the beam axis at 60 mm distance from the dipole. With this settings, the beam was numerically transported through the system with minimal emittance growth. Manufacturing of the septum system has started.
* Wiesner, C., et al. "Chopping High-Intensity Ion Beams at FRANZ", WEIOB01, LINAC 2014.
** Meusel, O., et al. "FRANZ–Accelerator Test Bench And Neutron Source", MO3A03, LINAC 2012.

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THPF030

Antiproton Acceleration and Deceleration in the HESR

antiproton, target, lattice, acceleration

3758

B. Lorentz, T. Katayama, A. Lehrach, R. Maier, D. Prasuhn, R. Stassen, H. Stockhorst, R. Tölle
FZJ, Jülich, Germany

The High Energy Storage Ring (HESR) is a part of the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt. The ring is used for hadron physics experiments with a pellet target and the PANDA detector, and will supply antiprotons of momenta from 1.5 GeV/c to 15 GeV/c. To cover the whole energy range a flexible adjustment of transition energy and the corresponding gamma-t value is foreseen. For Injection and Accumulation of Antiprotons delivered from the CR at a momentum of 3.8 GeV/c (gamma=4.2), the HESR optics will be tuned to gamma-t=6.2. For deceleration down to a momentum of 1.5 GeV/c this optic is suitable as well. Stochastic cooling at an intermediate energy is required to avoid beam losses caused by adiabatic growth of the beam during deceleration. For acceleration to 8 GeV/c (gamma=8.6) the optics will be changed after accumulation of the antiproton beam to gamma-t=14.6. For momenta higher than 8 GeV/c the beam will be debunched at 8 GeV/c, optics will be changed to gamma-t=6.2, and after adiabatic rebunching the beam will be accelerated to 15 GeV/c (gamma=16). Simulations show the feasibility of the described procedures with practically no beam losses.

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THPF031

Towards an RF Wien-Filter for EDM Experiments at COSY

resonance, polarization, betatron, storage-ring

3761

S. Mey, R. Gebel
FZJ, Jülich, Germany

Funding: The work is supported within the framework of the Helmholtz Association’s Accelerator Research and Development (ARD) program.
The JEDI Collaboration (Jülich Electric Dipole Moment (EDM) Investigations) is developing tools for the measurement of permanent EDMs of charged, light hadrons in storage rings. The Standard Model predicts unobservably small values for the EDM, but a non-vanishing EDM can be detected by measuring a tiny build-up of vertical polarization in a beforehand horizontally polarized beam. This technique requires a spin tune modulation by an RF Dipole without any excitation of beam oscillations. In the course of 2014, a prototype RF ExB-Dipole has been successfully commissioned and tested. To determine the characteristics of the device, the force of a radial magnetic field is canceled out by a vertical electric one. In this configuration, the dipole fields form a Wien-Filter that directly rotates the particles' polarization vector. We verified that the device can be used to continuously flip the vertical polarization of a 970 MeV(c deuteron beam without exciting any coherent beam oscillations. For a first EDM Experiment, the RF ExB-Dipole in Wien-Filter Mode is going to be rotated by 90° around the beam axis and will be used for systematic investigations of sources for false EDM signals.

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THPF035

Stripping of High Intensity Heavy-Ion Beams in a Pulsed Gas Stripper Device at 1.4 MeV/u

ion, brilliance, emittance, acceleration

3773

P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar
HIM, Mainz, Germany
W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, A. Yakushev
GSI, Darmstadt, Germany
Ch.E. Düllmann
Mainz University, Mainz, Germany

As part of an injector system for FAIR, the GSI UNILAC has to meet high demands in terms of beam brilliance at a low duty factor. To accomplish this goal an extensive upgrade program has started. To increase the beam intensity behind the UNILAC, it is aimed to increase the efficiency of the 1.4 MeV/u gas stripper. A modification of the stripper setup was developed to replace the N2-jet with a pulsed gas injection, synchronized with the transit of the beam pulse. The pulsed gas injection lowers the gas load for the differential pumping system, rendering possible the use of other promising gas targets. In recent measurements the performance of the modified setup was tested using an 238U-beam with various stripper media, including H2, He, and N2. The data provide a systematic basis for an improved understanding of slow heavy ions passing through gaseous media. The stripping performance of the current N2-jet was excelled by using H2 at increased gas densities, enabled by the new pulsed gas cell.

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THPF054

XAL Development for CSNS/RCS Commissioning

quadrupole, framework, simulation, controls

3821

Y.W. An, L. Huang, W.B. Liu, Y.D. Liu, S. Wang, Y. Wei
IHEP, Beijing, People's Republic of China

Funding: Work supported by the National Natural Science Fund Committee, contract 11405189.
As a key component of the China Spallation Neutron Source (CSNS) Project, the Rapid Cycling Synchrotron (RCS) accumulates and accelerates the proton beam from 80MeV to 1.6GeV for extracting and striking the target with a repetition rate of 25Hz. A high level application programming framework code called XAL, based on Java Language with a well-performance online model, initially developed at the Spallation Neutron Source (SNS), has been installed as a part of control system via connection to EPICS for CSNS. Much of the applications have been initially established such as Tune Scan, Tune Monitor, Orbit Response Matrix Measurement, RCS Orbit Display, and Beta Function Measurement for preparing CSNS/RCS commissioning are showed in this paper.

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THPF094

Possible Reuse of the LHC as a 3.3 TeV High Energy Booster for Hadron Injection into the FCC-hh Collider

collider, injection, extraction, insertion

3919

B. Goddard, W. Bartmann, M. Benedikt, W. Herr, M. Lamont, P. Lebrun, M. Meddahi, A. Milanese, M. Solfaroli Camillocci, L.S. Stoel
CERN, Geneva, Switzerland

One option for the injector into a 100 TeV centre-of-mass energy frontier proton collider (FCC-hh) in a new tunnel of 80–100 km circumference is to reuse a suitably modified LHC as 3.3 TeV High Energy Booster (HEB). The changes that would be required to the existing LHC insertions are described, including the types and numbers of new magnets and circuits. The limitations on the maximum LHC ramp rate and minimum cycle time discussed. The key question of the minimum FCC filling time achievable with technically possible upgrades is examined, together with the issues of decommissioning for the elements which would need to be removed from the machine. The potential performance reach of the modified LHC as 3.3 TeV HEB is quantified, and implications for FCC-hh discussed.

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THPF108

EBIS Charge Breeder at ANL and its Integration into ATLAS

ion, beam-transport, simulation, electron

3969

A. Perry, A. Barcikowski, G.L. Cherry, C. Dickerson, B. Mustapha, P.N. Ostroumov
ANL, Argonne, Illinois, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357.
An Electron Beam Ion Source charge breeder (EBIS-CB) has been developed to breed CARIBU radioactive beams at ATLAS and is in the final stages of off-line commissioning. Within the next year, the EBIS-CB will replace the existing ECR charge breeder to increase the intensity and improve the purity of reaccelerated radioactive ion beams. Integration of the new EBIS-CB requires: a. Building a compact fully electrostatic low energy beam transport line (LEBT) from CARIBU to the EBIS-CB that satisfies the spatial constraints and ensures the successful ion seeding into the EBIS trap. b. Modifications to the existing ATLAS LEBT to purify the EBIS beams by q/A selection and accommodate the injection of the charge bred ions into ATLAS. In this paper, we will describe the beam line design and present beam dynamics simulation results.

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THPF118

Fermilab Booster Injection Upgrade to 800 MeV for PIP-II

injection, booster, linac, closed-orbit

3986

D.E. Johnson, V.A. Lebedev, I.L. Rakhno
Fermilab, Batavia, Illinois, USA

Fermilab is proposing to build an 800 MeV superconducting linac which will be used to inject H⁻ ions into the existing Booster synchrotron as part of the proposed PIP-II project. The injection energy of the Booster will be raised from the current 400 MeV to 800 MeV. Transverse phase space painting will be required due to the small linac transverse emittance (emit_ring/emit_linac ~ 10) and low average linac current of 2 mA. The painting is also helpful with reduction of beam distributions resulting in a reduction of space charge effects. The injection will require approximately 300 turns corresponding to a ~ 0.5 ms injection time. A factor of seven increase in injected beam power (relative to present operation) requires an injection waste beam absorber. The paper describes the requirements for the injection insert, itsdesign, and plans for transverse painting.

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THPF121

Out of Time Beam Extinction in the Mu2e Experiment

simulation, experiment, proton, extraction

3996

E. Prebys, S.J. Werkema
Fermilab, Batavia, Illinois, USA

Funding: This project is supported by the US Department of Energy under contract No. De-AC02-07CH11359 .
The Mu2e Experiment at Fermilab will search for the conversion of a muon to an electron in the field of an atomic nucleus with unprecedented sensitivity. The experiment requires a beam consisting of proton bunches approximately 200ns FW long, separated by 1.7 microseconds, with no out-of-time protons at the 10^-10 fractional level. Satisfying this "extinction" requirement is very challenging. Simulations show that the formation of the bunches will result in an extinction of roughly 10^-5. The remaining extinction will be accomplished by a system of resonant magnets and collimators, configured such that only in-time beam is delivered to the experiment.

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THPF133

Textured-Powder BI-2212 Ag Wire Technology Development

interface, hadron, collider, electron

4030

P.M. McIntyre, J.N. Kellams, J.M. Vandergrifft
Texas A&M University, College Station, Texas, USA
K.C. Damborsky
Oxford Instruments, Semiconductor Systems, Carteret, New Jersey, USA
L. Motowidlo
SupraMagnetics, Inc., Plantsville, Connecticut, USA
N. Pogue
PSI, Villigen, Villigen, Switzerland

Progress is reported in developing textured-powder Bi-2212 cores as a new approach to Bi-2212/Ag wire tech-nology. The process builds upon earlier work in which Bi-2212 fine powder can be highly textured in its a-b plane orientation and fabricated into square-cross-section bars. The current work concerns an Enhanced Textured Powder (ETP) process, in which silver nanopowder is homogeneously mixed with the Bi-2212 powder. We report studies of the effect of the addition on the phase dynamics near melt temperature. ETP cores are being prepared for compounding into a billet to fabricate multi-filament wire.

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THPF134

Magnet Design and Synchrotron Damping Considerations for a 100 TeV Hadron Collider

collider, synchrotron, radiation, luminosity

4034

P.M. McIntyre, S. Assadi, J. Gerity, T.L. Mann, A. Sattarov
Texas A&M University, College Station, Texas, USA
D. Chavez
DCI-UG, León, Mexico
N. Pogue
PSI, Villigen, Villigen, Switzerland
M. Tomsic
Hypertech Research, Inc., Columbus, USA

A conceptual design is presented for a 100 TeV hadron collider based upon a 4.5 T NbTi cable-in-conduit dipole technology. It incorporates a side radiation channel to extract synchrotron radiation from the beam channel so that it does not produce limitations from heating on a beam liner or gas load limits on collider performance. Synchrotron damping can be used to support ‘bottom-up’ stacking to sustain maximum luminosity in the collisions.

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THPF135

Optimization of Orbits, SRF Acceleration, and Focusing Lattice for a Strong-Focusing Cyclotron

cavity, cyclotron, SRF, focusing

4038

K.E. Melconian, S. Assadi, J. Gerity, J.N. Kellams, P.M. McIntyre, A. Sattarov
Texas A&M University, College Station, Texas, USA
N. Pogue
PSI, Villigen, Villigen, Switzerland

The strong-focusing cyclotron is a high-current proton/ion accelerator in which superconducting rf cavities are used to provide enough energy gain per turn to fully separate orbits, and arc-shaped beam transport channels are located in the sector dipole aperture to provide strong focusing of all orbits. An optimization method has been devised by which the orbit separations can be adjusted to provide sufficient separation while maintaining isochronicity on all orbits. The transport optics of the FD lattice is also optimized to provide stable transport and to lock the betatron tunes to a favorable value over the full range of acceleration.

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FRXC2

The High Luminosity LHC Project

luminosity, operation, radiation, experiment

4096

O.S. Brüning
CERN, Geneva, Switzerland

This presentation reviews the status of the high luminosity LHC project, and highlights the main challenges from the technology and beam physics point of view. It will mention the outcome of the 2015 Cost and Schedule review for the HL-LHC project and summarizes the status of the high field quadrupole and crab cavity development.

Slides FRXC2 [7.951 MB]

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