IPAC2015 - List of Keywords (sextupole)

Paper	Title	Other Keywords	Page
MOPWA016	Increasing the Dynamic and Momentum Apertures of the ThomX Ring by Means of Octupole Correctors	octupole, resonance, multipole, dipole	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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA016
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MOPWA028	Resonance Compensation for High Intensity Bunched Beams	resonance, space-charge, ion, controls	159
	G. Franchetti, S. Aumon, F. Kesting, H. Liebermann, C. Omet, D. Ondreka, R. Singh GSI, Darmstadt, Germany
	Mitigation of periodic resonance crossing induced by space charge is foreseen via classic resonance compensation. The effect of the space charge is, however, not obvious on the effectiveness on the compensation scheme. In this proceeding we report on an experimental campaign performed at SIS18 in an attempt to investigate experimentally the effect of space charge on the resonance compensation. The experimental results and their consequences are discussed through numerical simulations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA028
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MOPWA039	Emittance Reduction Possibilities in the PETRA III Magnet Lattice	optics, emittance, lattice, synchrotron	197
	N. Golubeva, V. Balandin, W. Decking, R. Wanzenberg DESY, Hamburg, Germany
	PETRA III is a third generation light source that has been operated as a user facility since 2010 at DESY. An upgrade for additional beam lines has been carried out, and the recommissioning of the new beam lines is starting in spring 2015. In order to fully exploit the potential of the existing magnet lattice of the PETRA III ring, we present a study of beam optics modifications enabling the reduction of the horizontal emittance without changes of the lattice.
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MOPWA059	Dynamic Aperture Studies for the FCC-ee	lattice, collider, synchrotron, radiation	258
	L.E. Medina Medrano DCI-UG, León, Mexico R. Martin, R. Tomás, F. Zimmermann CERN, Geneva, Switzerland R. Martin Humboldt University Berlin, Berlin, Germany
	Funding: Work supported by the Beam Project (CONACYT, Mexico). Dynamic aperture (DA) studies have been conducted on the latest Future Circular Collider - ee (FCC-ee) lattices as a function of momentum deviation. Two different schemes for the interaction region are used, which are connected to the main arcs: the crab waist approach, developed by BINP, and an update to the CERN design where the use of crab cavities is envisioned. The results presented show an improvement in the performance of both designs.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA059
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MOPWA062	Optimization of the Momentum Bandwidth for Final Focus System in CEPC	factory, luminosity, collider, simulation	269
	S. Bai, T.J. Bian, J. Gao, H. Geng, D. Wang, Y. Wang, M. Xiao IHEP, Beijing, People's Republic of China F. Su Institute of High Energy Physics (IHEP), 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. To achieve such high luminosity, a final focus system in non-local chromaticity correction scheme with very low β functions at the interaction point is designed. The narrow momentum bandwidth is a crucial problem of this kind of design. It is shown that by introducing additional sextupoles the momentum acceptance of the CEPC final focus system can be increased by about a factor of four.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA062
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MOPJE015	Compensations of the DEPU Effects at the SSRF Storage Ring	quadrupole, coupling, injection, dynamic-aperture	307
	M.Z. Zhang, B.C. Jiang, J.H. Tan, S.Q. Tian, M. Zhang, Q.L. Zhang SINAP, Shanghai, People's Republic of China
	A paired APPLE-II type Ellipsoid Polarized Undulator（DEPU）has been installed in the SSRF storage ring which can be mechanically switched between two undulators with difference period length. One of them get notable effects on the optics including CODs, tune, coupling and dynamic aperture. We report in this paper, feed forward tables of correctors, quadrupoles and skew quarupoles are used for the optics correction and sextupole optimization is used for the dynamic aperture recovery.
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MOPJE030	Non-linear Dynamics model for the ESS Linac Simulator	octupole, linac, proton, space-charge	345
	E. Laface ESS, Lund, Sweden
	The ESS Proton Linac will run a beam with 62.5 mA of current. In the first meters of the accelerator, the non- linear space-charge force dominates the dynamics of the beam. The Drift Tube Linac, the Spoke resonators and the elliptical cavities, which are responsible for the 99.8% of the total energy gained by the beam along the accelerator, produce a significant longitudinal non-linear force on the proton beam. In this paper, we introduce a new theory to transport the probability density function of the beam under the effect of non-linear forces. A model based on this theory can be implemented in the ESS Linac Simulator for the fast simulations to be performed during the operations of the proton Linac.
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MOPJE034	Low Emittance Tuning for the CLIC Damping Rings	emittance, quadrupole, lattice, coupling	356
	J. Alabau-Gonzalvo, F. Antoniou, Y. Papaphilippou CERN, Geneva, Switzerland
	A study on the sensitivity of the CLIC Damping Ring lattice to different sources of misalignment is presented. Dipole and quadrupole rolls, quadrupole and sextupole vertical offsets are considered, as well as the impact of a finite BPM resolution. The result of this study defines a low emittance tuning procedure and establishes alignment tolerances to preserve the vertical emittance below the design value (1 pm·rad). Non-linear dynamics studies including dynamic aperture and frequency maps are shown and synchrotron radiation effects are discussed.
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MOPJE074	Optimizing SLS-2 Nonlinearities Using a Multi-Objective Genetic Optimizer	resonance, optics, octupole, injection	486
	M.P. Ehrlichman, M. Aiba, A. Streun PSI, Villigen PSI, Switzerland
	An upgrade to the SLS is currently under development. This upgrade will likely utilize the same hall and same machine circumference, 288 m, of the SLS. Achieving a sufficiently low emittance with such a small circumference requires tight focusing and low dispersion. These conditions make chromaticity correction difficult and minimization of 1st and 2nd order non-linear driving terms does not yield sufficient dynamic aperture and Touschek lifetime. In this proceeding, we discuss the multi-objective genetic optimization method being implemented at SLS to aid the design of a chromaticity correction scheme for SLS2.
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MOPMA011	Evaluation of Power Supply and Alignment Tolerances for the Advanced Photons Source Upgrade	dipole, 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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MOPMA015	Applications of an MPI Enhanced Simulated Annealing Algorithm on nuSTORM and 6D Muon Cooling	lattice, storage-ring, simulation, emittance	568
	A. Liu Fermilab, Batavia, Illinois, USA
	The nuSTORM decay ring is a compact racetrack storage ring with a circumference ∼ 480 m using large aperture (∅=60 cm) magnets. The design goal of the ring is to achieve a momentum acceptance of 3.8±10\% GeV/c and a phase space acceptance of 2000 μm·rad. The design has many challenges because the acceptance will be affected by many nonlinearity terms with large particle emittance and/or large momentum offset. In this paper, we present the application of a meta-heuristic optimization algorithm to the sextupole correction in the ring. The algorithm is capable of finding a balanced compromise among corrections of the nonlinearity terms, and finding the largest acceptance. This technique can be applied to the design of similar storage rings that store beams with wide transverse phase space and momentum spectra. We also present the recent study on the application of this algorithm to a part of the 6D muon cooling channel. The technique and the cooling concept will be applied to design a cooling channel for the extracted muon beam at nuSTORM in the future study.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA015
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MOPMN024	Study of NSLS-II Dynamic Aperture Tolerances with Respect to Field and Orbit Errors	dynamic-aperture, lattice, quadrupole, alignment	751
	J. Choi, T.V. Shaftan, G.M. Wang BNL, Upton, Long Island, New York, USA
	Funding: DOE contract No: DE-AC02- 98CH10886 As the emittance of synchrotron light sources moves towards diffraction limit, magnet tolerances for reaching dynamic aperture for high injection efficiency and long lifetime become more stringent. Once nonlinear families are designed and the machine is built a machine operator may ask to which accuracy the linear optics and orbit should be corrected so to achieve reasonable dynamic aperture. We also studied the relations of the non-linear elements and beta-beat to the dynamic apertures by simulating NSLS-II storage ring lattice and the paper shows the results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMN024
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MOPMN027	Optimization of Dynamic Aperture for Hadron Lattices in eRHIC	lattice, hadron, storage-ring, collider	757
	Y.C. Jing, V. Litvinenko, D. Trbojevic 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. The potential upgrade of the Relativistic Heavy Ion Collider (RHIC) to an electron ion collider (eRHIC) involves numerous extensive changes to the existing collider complex. The expected very high luminosity is planned to be achieved at eRHIC with the help of squeezing the beta function of the hadron ring at the IP to a few cm, causing a large rise of the natural chromaticities and thus bringing with it challenges for the beam long term stability (Dynamic aperture). We present our effort to expand the DA by carefully tuning the nonlinear magnets thus controlling the size of the footprints in tune space and all lower order resonance driving terms. We show a reasonably large DA through particle tracking over millions of turns of beam revolution.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMN027
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MOPMN030	Proton Spin Tracking with Symplectic Integration of Orbit Motion	proton, closed-orbit, resonance, ion	766
	Y. Luo, Y. Dutheil, H. Huang, F. Méot, V.H. Ranjbar 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. Symplectic integration for orbital motion had been adopted in SimTrack which has been extensively used for dynamic aperture calculation with beam-beam interaction for the Relativistic Heavy Ion Collider (RHIC). Recently spin tracking for protons has been implemented on top of the orbit motion in this code. In this article, we will explain the implementation of spin motion using Thomas-BMT equation, and benchmark with other spin tracking codes currently used for RHIC. Possibility and remedy for very-long term particle tracking, such as on the RHIC energy acceleration, is also explored.
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TUAB1	Correction of Nonlinear Coupling Resonances in the SPring-8 Storage Ring	coupling, resonance, injection, octupole	1329
	M. Takao, K. Fukami, Y. Shimosaki, K. Soutome JASRI/SPring-8, Hyogo-ken, Japan
	The correction of the lattice nonlinearity of the storage rings is crucial for the enlargement of the dynamic aperture of the storage rings, which in general leads to the higher injection efficiency and the longer lifetime. At the SPring-8 storage ring, it is realized that the higher order coupling resonances are considerably excited. After the usual correction of the nonlinear dynamics in terms of the normal sextupole magnets, we suppress one of the resonances by using the skew sextupole magnets for the purpose of further improving the dynamic aperture. As a result of the correction by the skew sextupoles, the reckoned improvement of the injection efficiency and the lifetime is achieved. Furthermore, at the SPring-8 storage ring, it is observed that the error magnetic field of a particular insertion device (ID) excites the higher nonlinear coupling resonance of the skew octupoles, which remarkably deteriorates the injection efficiency. In order to correct the coupling resonance, we have installed the octupole magnets at the ID, by which we restore the injection efficiency.
	Slides TUAB1 [3.275 MB]
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TUAB3	Chromaticity Effects for Space Charge Dominated Beams in the CERN PS Booster	space-charge, resonance, simulation, emittance	1335
	V. Forte Université Blaise Pascal, Clermont-Ferrand, France E. Benedetto, F. Schmidt CERN, Geneva, Switzerland
	In view of the LHC Injectors Upgrade (LIU) project, an extensive campaign is on-going in the CERN PS Booster (PSB) to study collective effects for the future operation with the 160 MeV injection from Linac4. In operation, the machine is running with uncorrected natural chromaticity. This paper focuses on the study of the effects of chromaticity on losses and beam blow-up.
	Slides TUAB3 [4.887 MB]
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TUAD1	Magnet Design and Control of Field Quality for TPS Booster and Storage Rings	quadrupole, dipole, 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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TUPWA013	Linear and Nonlinear Optimizations for the ESRF Upgrade Lattice	lattice, injection, dynamic-aperture, optics	1422
	N. Carmignani, L. Farvacque, S.M. Liuzzo, B. Nash, T.P. Perron, P. Raimondi, R. Versteegen, S.M. White ESRF, Grenoble, France
	The ESRF storage ring will be replaced in 2020 by a new hybrid multi bend achromat lattice with 134 pmrad equilibrium horizontal emittance. To determine the best working point, large scans of tunes and chromaticities have been performed, computing Touschek lifetime and dynamic aperture. From different working points, the multi-objective genetic algorithm NSGA-II has been used to optimize the nonlinear magnets values and some linear optics parameters. The analysis have been carried out on lattices with errors and corrections. The optimizations have produced lattices with longer lifetime and larger dynamic aperture for different working points with positive chromaticities.
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TUPWA069	Simulation Study on Bunch Compression and Decompression for the Compact ERL	simulation, linac, optics, emittance	1591
	N. Nakamura, K. Harada, T. Miyajima, S. Sakanaka, M. Shimada, O. Tanaka KEK, Ibaraki, Japan
	Generation of THz coherent radiation (THz-CSR) is planned for the near future at the Compact Energy Recovery Linac (cERL) in KEK where the beam recirculation and energy recovery were already achieved in February 2014 and an experiment for generation of laser-Compton scattering X-rays (LCS-X) is being prepared to start in February 2015. To achieve a ultra-short bunch less than 100 fs for generation of the THz-CSR up to 5 THz, we have studied bunch compression and decompression in the cERL mainly by using a simulation code ELEGANT. In this study, off-crest acceleration in the main superconducting linac and non-zero R56 optics in the two arc sections are used and sextupole magnets are introduced into the two arc sections for correcting T566 of the arc sections. In this paper, we will present the simulation results and the requirements for the sextupole magnets including their number and layout.
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TUPJE022	Study on Beam Dynamics of a Knot-APPLE Undulator Proposed for SSRF	polarization, undulator, quadrupole, operation	1669
	Q.L. Zhang, B.C. Jiang, S.Q. Tian, Z.T. Zhao, Q.G. Zhou SINAP, Shanghai, People's Republic of China
	A new type of undulator, Knot-APPLE undulator, is proposed for SSRF as a solution to reduce the heat load of on-axis high harmonics without losing its capability of tuning synchrotron polarization. It will be applied for SSRF Photoemission Spectroscopy beamline (PES-beamline) in the near future. Impact of the undulator on the beam dynamics has been studied based on the 3D magnetic field model and kick map analysis. Linear optics can be retained by quadrupole compensation within two adjacent cells. Dynamical aperture (DA) shrinkage has been found in the tracking and optimized with sextupoles. An active correction scheme of current strips is studied to compensate the kick maps, and both the linear and nonlinear effects are suppressed.
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TUPJE063	Hybrid Seven-Bend-Achromat Lattice for the Advanced Photon Source Upgrade	lattice, emittance, multipole, injection	1776
	M. Borland, V. Sajaev, Y. Sun 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. A hybrid seven-bend-achromat lattice has been designed for the APS upgrade. We describe the design goals, constraints, and methodology, including the choice of beam energy. Magnet strength and spacing is compatible with engineering designs for the magnets, diagnostics, and vacuum system. Dynamic acceptance and local momentum acceptance were simulated using realistic errors, then used to assess workable injection methods and predict beam lifetime. Predicted brightness is two to three orders of magnitude higher than the existing APS storage ring. Pointers are provided to other papers in this conference that cover subjects in more detail.
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TUPTY018	Interaction region for crab waist scheme of the Future Electron-Positron Collider (CERN)	quadrupole, luminosity, collider, lattice	2034
	A.V. Bogomyagkov, E.B. Levichev BINP SB RAS, Novosibirsk, Russia
	Funding: Work is supported by the Ministry of Education and Science of the Russian Federation Design study of the accelerator that would fit 80-100~km tunnel called Future Circular Colliders (FCC) includes high-luminosity e⁺e^- collider (FCC-ee) with center-of-mass energy from 90 to 350~GeV to study Higgs boson properties and perform precise measurements at the electroweak scale. Crab waist interaction region provides collisions with luminosity higher than 2×10³⁶~cm^-2sec^-1 at beam energy of 45~GeV. The small values of the beta functions at the interaction point and distant final focus lenses are the reasons for high nonlinear chromaticity limiting energy acceptance of the whole ring. The paper describes interaction region for crab waist collision scheme in the FCC-ee, principles of tuning the chromaticity correction section in order to provide large energy acceptance.
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TUPTY081	Design of a 6 TeV Muon Collider	dynamic-aperture, quadrupole, collider, octupole	2226
	M.-H. Wang, Y. Cai, Y. Nosochkov SLAC, Menlo Park, California, USA M.A. Palmer Fermilab, Batavia, Illinois, USA
	Funding: Work supported by the US Department of Energy contract DE-AC02-76SF00515 A design of a muon collider ring with the center of mass energy of 6 TeV is presented. The ring circumference is about 6.3 km, and the beta functions at collision point are 1 cm in both planes. The ring linear optics, the non-linear chromaticity correction scheme in the Interaction Region (IR), and the additional non-linear field orthogonal knobs are described in detail. The IR magnet specifications are based on the maximum pole tip field of 20 T in dipoles and 15 T in quadrupoles. The results of the beam dynamics optimization for maximum dynamic aperture are presented.
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TUPWI032	Progress on Optimization of the Nonlinear Beam Dynamics in the MEIC Collider Rings	ion, optics, distributed, dynamic-aperture	2311
	Y. Nosochkov, Y. Cai, M.K. Sullivan, M.-H. Wang, U. Wienands SLAC, Menlo Park, California, USA Y.S. Derbenev, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under US DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported by the US DOE Contract DE-AC02-76SF00515. One of the key design features of the Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab is a small beta function at the interaction point (IP) allowing one to achieve a high luminosity of up to 10³⁴ cm^-2s^-1. The required strong beam focusing unavoidably causes large chromatic effects such as chromatic tune spread and beam smear at the IP, which need to be compensated. This paper reports recent progress in our development of a chromaticity correction scheme for the ion ring including optimization of dynamic aperture and momentum acceptance.
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WEPMN007	Research Development of High Precision Installation and Alignment System for HEPS	alignment, quadrupole, multipole, controls	2924
	L. Wu, S.Y. Chen, C. H. Li, H. Qu, H.J. Wang, X.L. Wang IHEP, Beijing, People's Republic of China
	High Energy Photon Source (HEPS) is a proposed 6 GeV third generation light source with high brightness and ultra-low emittance. Because the measurement error of the traditional optical survey method in the girder and magnet installation can’t meet the tight alignment tolerance, the installation and alignment will not only rely on laser tracker and some other optical survey instruments. So HEPS is developing the research of high precision installation and alignment system which is consists of the design of auto-tuning girder based on beam alignment and research of vibrating wire alignment system based on magnetic measurement. This paper introduces the research development of installation and alignment system in storage ring of HEPS.
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WEPMN062	MAX IV 3 GeV Storage Ring Magnet Block Production Series Measurement Results	dipole, storage-ring, 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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WEPTY003	Magnet Designs for the Multi-bend Achromat Lattice at the Advanced Photon Source	dipole, quadrupole, 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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WEPWI034	Effects of Crab Cavities' Multipole Content in an Electron-Ion Collider	dipole, 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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THPF137	Beam Dynamics Effects of High Order Multipoles in Non-Axisymmetric Superconducting RF Cavities	multipole, linac, octupole, lattice	4045
	Z.Q. He, J. Wei, Y. Zhang FRIB, East Lansing, Michigan, USA
	Funding: The work is supported by the U.S. National Science Foundation under Grant No. PHY-11-02511, and the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661. Non-axisymmetric superconducting RF cavities have been widely used in accelerator facilities. Because of the geometry, electric and magnetic multipole components, including steering terms, quadrupole terms, and higher order terms, would arise and have potential effects on beam dynamics. In this paper, we start with a simple linac periodic structure to study the effects of higher order terms. The action is defined as a figure of merit to quantify the effects. After that, we move to a more realistic situation of FRIB linac segment 1 (LS1). Multipole terms of quarter wave resonators (QWRs) are firstly calculated using multipole expansion scheme. Then, the scheme is tested using the FRIB linac lattice with QWRs, and the effects of higher order terms on FRIB LS1 are estimated.
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THPF146	Spin Coherence Time Lengthening of a Polarized Deuteron Beam Using Sextupole FieldsFields	polarization, storage-ring, emittance, electron	4066
	G. Guidoboni UNIFE, Ferrara, Italy
	Funding: Forschungszentrum Jülich is a member of the Helmholtz Association The measurement of a non-zero electric dipole moment (EDM) aligned along the spin of sub-atomic particles would probe new physics beyond the standard model. It has been proposed to search for the EDM of charged particles using a storage ring and a longitudinally polarized beam. The EDM signal would be a rotation of the polarization from the horizontal plane toward the vertical direction as a consequence of the radial electric field always present in the particle frame. This experiment requires ring conditions that can ensure a lifetime of the in-plane polarization (spin coherence time, SCT) up to 1000 s. At the COoler SYnchrotron (COSY) located at the Forschungszentrum Jülich, the JEDI collaboration has begun to examine the effects of emittance and momentum spread on the SCT of a polarized deuteron beam at 0.97 GeV/c. The set of data presented here shows how second-order effects from emittance and momentum spread of the beam affect the lifetime of the horizontal polarization of a bunched beam. It has been observed that sextupole fields can correct for depolarizing sources and increase the spin coherence time up to hundreds of seconds while setting the chromaticities equal to zero.
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Paper

Title

Other Keywords

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MOPWA016

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

octupole, resonance, multipole, dipole

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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MOPWA028

Resonance Compensation for High Intensity Bunched Beams

resonance, space-charge, ion, controls

159

G. Franchetti, S. Aumon, F. Kesting, H. Liebermann, C. Omet, D. Ondreka, R. Singh
GSI, Darmstadt, Germany

Mitigation of periodic resonance crossing induced by space charge is foreseen via classic resonance compensation. The effect of the space charge is, however, not obvious on the effectiveness on the compensation scheme. In this proceeding we report on an experimental campaign performed at SIS18 in an attempt to investigate experimentally the effect of space charge on the resonance compensation. The experimental results and their consequences are discussed through numerical simulations.

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MOPWA039

Emittance Reduction Possibilities in the PETRA III Magnet Lattice

optics, emittance, lattice, synchrotron

197

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

PETRA III is a third generation light source that has been operated as a user facility since 2010 at DESY. An upgrade for additional beam lines has been carried out, and the recommissioning of the new beam lines is starting in spring 2015. In order to fully exploit the potential of the existing magnet lattice of the PETRA III ring, we present a study of beam optics modifications enabling the reduction of the horizontal emittance without changes of the lattice.

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MOPWA059

Dynamic Aperture Studies for the FCC-ee

lattice, collider, synchrotron, radiation

258

L.E. Medina Medrano
DCI-UG, León, Mexico
R. Martin, R. Tomás, F. Zimmermann
CERN, Geneva, Switzerland
R. Martin
Humboldt University Berlin, Berlin, Germany

Funding: Work supported by the Beam Project (CONACYT, Mexico).
Dynamic aperture (DA) studies have been conducted on the latest Future Circular Collider - ee (FCC-ee) lattices as a function of momentum deviation. Two different schemes for the interaction region are used, which are connected to the main arcs: the crab waist approach, developed by BINP, and an update to the CERN design where the use of crab cavities is envisioned. The results presented show an improvement in the performance of both designs.

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MOPWA062

Optimization of the Momentum Bandwidth for Final Focus System in CEPC

factory, luminosity, collider, simulation

269

S. Bai, T.J. Bian, J. Gao, H. Geng, D. Wang, Y. Wang, M. Xiao
IHEP, Beijing, People's Republic of China
F. Su
Institute of High Energy Physics (IHEP), 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. To achieve such high luminosity, a final focus system in non-local chromaticity correction scheme with very low β functions at the interaction point is designed. The narrow momentum bandwidth is a crucial problem of this kind of design. It is shown that by introducing additional sextupoles the momentum acceptance of the CEPC final focus system can be increased by about a factor of four.

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MOPJE015

Compensations of the DEPU Effects at the SSRF Storage Ring

quadrupole, coupling, injection, dynamic-aperture

307

M.Z. Zhang, B.C. Jiang, J.H. Tan, S.Q. Tian, M. Zhang, Q.L. Zhang
SINAP, Shanghai, People's Republic of China

A paired APPLE-II type Ellipsoid Polarized Undulator（DEPU）has been installed in the SSRF storage ring which can be mechanically switched between two undulators with difference period length. One of them get notable effects on the optics including CODs, tune, coupling and dynamic aperture. We report in this paper, feed forward tables of correctors, quadrupoles and skew quarupoles are used for the optics correction and sextupole optimization is used for the dynamic aperture recovery.

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MOPJE030

Non-linear Dynamics model for the ESS Linac Simulator

octupole, linac, proton, space-charge

345

E. Laface
ESS, Lund, Sweden

The ESS Proton Linac will run a beam with 62.5 mA of current. In the first meters of the accelerator, the non- linear space-charge force dominates the dynamics of the beam. The Drift Tube Linac, the Spoke resonators and the elliptical cavities, which are responsible for the 99.8% of the total energy gained by the beam along the accelerator, produce a significant longitudinal non-linear force on the proton beam. In this paper, we introduce a new theory to transport the probability density function of the beam under the effect of non-linear forces. A model based on this theory can be implemented in the ESS Linac Simulator for the fast simulations to be performed during the operations of the proton Linac.

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MOPJE034

Low Emittance Tuning for the CLIC Damping Rings

emittance, quadrupole, lattice, coupling

356

J. Alabau-Gonzalvo, F. Antoniou, Y. Papaphilippou
CERN, Geneva, Switzerland

A study on the sensitivity of the CLIC Damping Ring lattice to different sources of misalignment is presented. Dipole and quadrupole rolls, quadrupole and sextupole vertical offsets are considered, as well as the impact of a finite BPM resolution. The result of this study defines a low emittance tuning procedure and establishes alignment tolerances to preserve the vertical emittance below the design value (1 pm·rad). Non-linear dynamics studies including dynamic aperture and frequency maps are shown and synchrotron radiation effects are discussed.

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MOPJE074

Optimizing SLS-2 Nonlinearities Using a Multi-Objective Genetic Optimizer

resonance, optics, octupole, injection

486

M.P. Ehrlichman, M. Aiba, A. Streun
PSI, Villigen PSI, Switzerland

An upgrade to the SLS is currently under development. This upgrade will likely utilize the same hall and same machine circumference, 288 m, of the SLS. Achieving a sufficiently low emittance with such a small circumference requires tight focusing and low dispersion. These conditions make chromaticity correction difficult and minimization of 1st and 2nd order non-linear driving terms does not yield sufficient dynamic aperture and Touschek lifetime. In this proceeding, we discuss the multi-objective genetic optimization method being implemented at SLS to aid the design of a chromaticity correction scheme for SLS2.

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MOPMA011

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

dipole, 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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MOPMA015

Applications of an MPI Enhanced Simulated Annealing Algorithm on nuSTORM and 6D Muon Cooling

lattice, storage-ring, simulation, emittance

568

A. Liu
Fermilab, Batavia, Illinois, USA

The nuSTORM decay ring is a compact racetrack storage ring with a circumference ∼ 480 m using large aperture (∅=60 cm) magnets. The design goal of the ring is to achieve a momentum acceptance of 3.8±10\% GeV/c and a phase space acceptance of 2000 μm·rad. The design has many challenges because the acceptance will be affected by many nonlinearity terms with large particle emittance and/or large momentum offset. In this paper, we present the application of a meta-heuristic optimization algorithm to the sextupole correction in the ring. The algorithm is capable of finding a balanced compromise among corrections of the nonlinearity terms, and finding the largest acceptance. This technique can be applied to the design of similar storage rings that store beams with wide transverse phase space and momentum spectra. We also present the recent study on the application of this algorithm to a part of the 6D muon cooling channel. The technique and the cooling concept will be applied to design a cooling channel for the extracted muon beam at nuSTORM in the future study.

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MOPMN024

Study of NSLS-II Dynamic Aperture Tolerances with Respect to Field and Orbit Errors

dynamic-aperture, lattice, quadrupole, alignment

751

J. Choi, T.V. Shaftan, G.M. Wang
BNL, Upton, Long Island, New York, USA

Funding: DOE contract No: DE-AC02- 98CH10886
As the emittance of synchrotron light sources moves towards diffraction limit, magnet tolerances for reaching dynamic aperture for high injection efficiency and long lifetime become more stringent. Once nonlinear families are designed and the machine is built a machine operator may ask to which accuracy the linear optics and orbit should be corrected so to achieve reasonable dynamic aperture. We also studied the relations of the non-linear elements and beta-beat to the dynamic apertures by simulating NSLS-II storage ring lattice and the paper shows the results.

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MOPMN027

Optimization of Dynamic Aperture for Hadron Lattices in eRHIC

lattice, hadron, storage-ring, collider

757

Y.C. Jing, V. Litvinenko, D. Trbojevic
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.
The potential upgrade of the Relativistic Heavy Ion Collider (RHIC) to an electron ion collider (eRHIC) involves numerous extensive changes to the existing collider complex. The expected very high luminosity is planned to be achieved at eRHIC with the help of squeezing the beta function of the hadron ring at the IP to a few cm, causing a large rise of the natural chromaticities and thus bringing with it challenges for the beam long term stability (Dynamic aperture). We present our effort to expand the DA by carefully tuning the nonlinear magnets thus controlling the size of the footprints in tune space and all lower order resonance driving terms. We show a reasonably large DA through particle tracking over millions of turns of beam revolution.

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MOPMN030

Proton Spin Tracking with Symplectic Integration of Orbit Motion

proton, closed-orbit, resonance, ion

766

Y. Luo, Y. Dutheil, H. Huang, F. Méot, V.H. Ranjbar
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.
Symplectic integration for orbital motion had been adopted in SimTrack which has been extensively used for dynamic aperture calculation with beam-beam interaction for the Relativistic Heavy Ion Collider (RHIC). Recently spin tracking for protons has been implemented on top of the orbit motion in this code. In this article, we will explain the implementation of spin motion using Thomas-BMT equation, and benchmark with other spin tracking codes currently used for RHIC. Possibility and remedy for very-long term particle tracking, such as on the RHIC energy acceleration, is also explored.

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TUAB1

Correction of Nonlinear Coupling Resonances in the SPring-8 Storage Ring

coupling, resonance, injection, octupole

1329

M. Takao, K. Fukami, Y. Shimosaki, K. Soutome
JASRI/SPring-8, Hyogo-ken, Japan

The correction of the lattice nonlinearity of the storage rings is crucial for the enlargement of the dynamic aperture of the storage rings, which in general leads to the higher injection efficiency and the longer lifetime. At the SPring-8 storage ring, it is realized that the higher order coupling resonances are considerably excited. After the usual correction of the nonlinear dynamics in terms of the normal sextupole magnets, we suppress one of the resonances by using the skew sextupole magnets for the purpose of further improving the dynamic aperture. As a result of the correction by the skew sextupoles, the reckoned improvement of the injection efficiency and the lifetime is achieved. Furthermore, at the SPring-8 storage ring, it is observed that the error magnetic field of a particular insertion device (ID) excites the higher nonlinear coupling resonance of the skew octupoles, which remarkably deteriorates the injection efficiency. In order to correct the coupling resonance, we have installed the octupole magnets at the ID, by which we restore the injection efficiency.

Slides TUAB1 [3.275 MB]

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TUAB3

Chromaticity Effects for Space Charge Dominated Beams in the CERN PS Booster

space-charge, resonance, simulation, emittance

1335

V. Forte
Université Blaise Pascal, Clermont-Ferrand, France
E. Benedetto, F. Schmidt
CERN, Geneva, Switzerland

In view of the LHC Injectors Upgrade (LIU) project, an extensive campaign is on-going in the CERN PS Booster (PSB) to study collective effects for the future operation with the 160 MeV injection from Linac4. In operation, the machine is running with uncorrected natural chromaticity. This paper focuses on the study of the effects of chromaticity on losses and beam blow-up.

Slides TUAB3 [4.887 MB]

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TUAD1

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

quadrupole, dipole, 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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TUPWA013

Linear and Nonlinear Optimizations for the ESRF Upgrade Lattice

lattice, injection, dynamic-aperture, optics

1422

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

The ESRF storage ring will be replaced in 2020 by a new hybrid multi bend achromat lattice with 134 pmrad equilibrium horizontal emittance. To determine the best working point, large scans of tunes and chromaticities have been performed, computing Touschek lifetime and dynamic aperture. From different working points, the multi-objective genetic algorithm NSGA-II has been used to optimize the nonlinear magnets values and some linear optics parameters. The analysis have been carried out on lattices with errors and corrections. The optimizations have produced lattices with longer lifetime and larger dynamic aperture for different working points with positive chromaticities.

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TUPWA069

Simulation Study on Bunch Compression and Decompression for the Compact ERL

simulation, linac, optics, emittance

1591

N. Nakamura, K. Harada, T. Miyajima, S. Sakanaka, M. Shimada, O. Tanaka
KEK, Ibaraki, Japan

Generation of THz coherent radiation (THz-CSR) is planned for the near future at the Compact Energy Recovery Linac (cERL) in KEK where the beam recirculation and energy recovery were already achieved in February 2014 and an experiment for generation of laser-Compton scattering X-rays (LCS-X) is being prepared to start in February 2015. To achieve a ultra-short bunch less than 100 fs for generation of the THz-CSR up to 5 THz, we have studied bunch compression and decompression in the cERL mainly by using a simulation code ELEGANT. In this study, off-crest acceleration in the main superconducting linac and non-zero R56 optics in the two arc sections are used and sextupole magnets are introduced into the two arc sections for correcting T566 of the arc sections. In this paper, we will present the simulation results and the requirements for the sextupole magnets including their number and layout.

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TUPJE022

Study on Beam Dynamics of a Knot-APPLE Undulator Proposed for SSRF

polarization, undulator, quadrupole, operation

1669

Q.L. Zhang, B.C. Jiang, S.Q. Tian, Z.T. Zhao, Q.G. Zhou
SINAP, Shanghai, People's Republic of China

A new type of undulator, Knot-APPLE undulator, is proposed for SSRF as a solution to reduce the heat load of on-axis high harmonics without losing its capability of tuning synchrotron polarization. It will be applied for SSRF Photoemission Spectroscopy beamline (PES-beamline) in the near future. Impact of the undulator on the beam dynamics has been studied based on the 3D magnetic field model and kick map analysis. Linear optics can be retained by quadrupole compensation within two adjacent cells. Dynamical aperture (DA) shrinkage has been found in the tracking and optimized with sextupoles. An active correction scheme of current strips is studied to compensate the kick maps, and both the linear and nonlinear effects are suppressed.

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TUPJE063

Hybrid Seven-Bend-Achromat Lattice for the Advanced Photon Source Upgrade

lattice, emittance, multipole, injection

1776

M. Borland, V. Sajaev, Y. Sun
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.
A hybrid seven-bend-achromat lattice has been designed for the APS upgrade. We describe the design goals, constraints, and methodology, including the choice of beam energy. Magnet strength and spacing is compatible with engineering designs for the magnets, diagnostics, and vacuum system. Dynamic acceptance and local momentum acceptance were simulated using realistic errors, then used to assess workable injection methods and predict beam lifetime. Predicted brightness is two to three orders of magnitude higher than the existing APS storage ring. Pointers are provided to other papers in this conference that cover subjects in more detail.

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TUPTY018

Interaction region for crab waist scheme of the Future Electron-Positron Collider (CERN)

quadrupole, luminosity, collider, lattice

2034

A.V. Bogomyagkov, E.B. Levichev
BINP SB RAS, Novosibirsk, Russia

Funding: Work is supported by the Ministry of Education and Science of the Russian Federation
Design study of the accelerator that would fit 80-100~km tunnel called Future Circular Colliders (FCC) includes high-luminosity e⁺e^- collider (FCC-ee) with center-of-mass energy from 90 to 350~GeV to study Higgs boson properties and perform precise measurements at the electroweak scale. Crab waist interaction region provides collisions with luminosity higher than 2×10³⁶~cm^-2sec^-1 at beam energy of 45~GeV. The small values of the beta functions at the interaction point and distant final focus lenses are the reasons for high nonlinear chromaticity limiting energy acceptance of the whole ring. The paper describes interaction region for crab waist collision scheme in the FCC-ee, principles of tuning the chromaticity correction section in order to provide large energy acceptance.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY018

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TUPTY081

Design of a 6 TeV Muon Collider

dynamic-aperture, quadrupole, collider, octupole

2226

M.-H. Wang, Y. Cai, Y. Nosochkov
SLAC, Menlo Park, California, USA
M.A. Palmer
Fermilab, Batavia, Illinois, USA

Funding: Work supported by the US Department of Energy contract DE-AC02-76SF00515
A design of a muon collider ring with the center of mass energy of 6 TeV is presented. The ring circumference is about 6.3 km, and the beta functions at collision point are 1 cm in both planes. The ring linear optics, the non-linear chromaticity correction scheme in the Interaction Region (IR), and the additional non-linear field orthogonal knobs are described in detail. The IR magnet specifications are based on the maximum pole tip field of 20 T in dipoles and 15 T in quadrupoles. The results of the beam dynamics optimization for maximum dynamic aperture are presented.

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TUPWI032

Progress on Optimization of the Nonlinear Beam Dynamics in the MEIC Collider Rings

ion, optics, distributed, dynamic-aperture

2311

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

Funding: Authored by Jefferson Science Associates, LLC under US DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported by the US DOE Contract DE-AC02-76SF00515.
One of the key design features of the Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab is a small beta function at the interaction point (IP) allowing one to achieve a high luminosity of up to 10³⁴ cm^-2s^-1. The required strong beam focusing unavoidably causes large chromatic effects such as chromatic tune spread and beam smear at the IP, which need to be compensated. This paper reports recent progress in our development of a chromaticity correction scheme for the ion ring including optimization of dynamic aperture and momentum acceptance.

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WEPMN007

Research Development of High Precision Installation and Alignment System for HEPS

alignment, quadrupole, multipole, controls

2924

L. Wu, S.Y. Chen, C. H. Li, H. Qu, H.J. Wang, X.L. Wang
IHEP, Beijing, People's Republic of China

High Energy Photon Source (HEPS) is a proposed 6 GeV third generation light source with high brightness and ultra-low emittance. Because the measurement error of the traditional optical survey method in the girder and magnet installation can’t meet the tight alignment tolerance, the installation and alignment will not only rely on laser tracker and some other optical survey instruments. So HEPS is developing the research of high precision installation and alignment system which is consists of the design of auto-tuning girder based on beam alignment and research of vibrating wire alignment system based on magnetic measurement. This paper introduces the research development of installation and alignment system in storage ring of HEPS.

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WEPMN062

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

dipole, storage-ring, 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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WEPTY003

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

dipole, quadrupole, 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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WEPWI034

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

dipole, 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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THPF137

Beam Dynamics Effects of High Order Multipoles in Non-Axisymmetric Superconducting RF Cavities

multipole, linac, octupole, lattice

4045

Z.Q. He, J. Wei, Y. Zhang
FRIB, East Lansing, Michigan, USA

Funding: The work is supported by the U.S. National Science Foundation under Grant No. PHY-11-02511, and the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
Non-axisymmetric superconducting RF cavities have been widely used in accelerator facilities. Because of the geometry, electric and magnetic multipole components, including steering terms, quadrupole terms, and higher order terms, would arise and have potential effects on beam dynamics. In this paper, we start with a simple linac periodic structure to study the effects of higher order terms. The action is defined as a figure of merit to quantify the effects. After that, we move to a more realistic situation of FRIB linac segment 1 (LS1). Multipole terms of quarter wave resonators (QWRs) are firstly calculated using multipole expansion scheme. Then, the scheme is tested using the FRIB linac lattice with QWRs, and the effects of higher order terms on FRIB LS1 are estimated.

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THPF146

Spin Coherence Time Lengthening of a Polarized Deuteron Beam Using Sextupole FieldsFields

polarization, storage-ring, emittance, electron

4066

G. Guidoboni
UNIFE, Ferrara, Italy

Funding: Forschungszentrum Jülich is a member of the Helmholtz Association
The measurement of a non-zero electric dipole moment (EDM) aligned along the spin of sub-atomic particles would probe new physics beyond the standard model. It has been proposed to search for the EDM of charged particles using a storage ring and a longitudinally polarized beam. The EDM signal would be a rotation of the polarization from the horizontal plane toward the vertical direction as a consequence of the radial electric field always present in the particle frame. This experiment requires ring conditions that can ensure a lifetime of the in-plane polarization (spin coherence time, SCT) up to 1000 s. At the COoler SYnchrotron (COSY) located at the Forschungszentrum Jülich, the JEDI collaboration has begun to examine the effects of emittance and momentum spread on the SCT of a polarized deuteron beam at 0.97 GeV/c. The set of data presented here shows how second-order effects from emittance and momentum spread of the beam affect the lifetime of the horizontal polarization of a bunched beam. It has been observed that sextupole fields can correct for depolarizing sources and increase the spin coherence time up to hundreds of seconds while setting the chromaticities equal to zero.

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