Keyword: acceleration
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MOBB1 Status of the Proton Beam Commissioning at the MedAustron Ion Beam Therapy Centre injection, proton, extraction, synchrotron 28
 
  • A. Garonna, M. Kronberger, T.K.D. Kulenkampff, C. Kurfürst, F. Osmić, L.C. Penescu, M.T.F. Pivi, C. Schmitzer, P. Urschütz, A. Wastl
    EBG MedAustron, Wr. Neustadt, Austria
  
  The MedAustron accelerator, located in Wiener Neustadt (Austria), will deliver clinical beams of protons (60-250 MeV) and carbon ions (120-400 MeV/n) to three ion beam therapy irradiation rooms (IR). Clinical beams and proton beams up to 800 MeV will be provided in a fourth IR, dedicated to non-clinical research. A slow-extracted proton beam of maximum clinical energy has been delivered for the first time in IR3 in October 2014, thus providing the technical proof-of-principle of the accelerator chain. The recent related beam commissioning efforts included setting up of the multi-turn injection into the synchrotron at 7 MeV, the acceleration on first harmonic up to 250 MeV, the slow extraction on the third integer resonance with a betatron core and the matching of the High Energy Beam Transfer line. The accelerator optimization phase leading to IR3 medical commissioning of proton beams is ongoing. The main characteristics of the MedAustron accelerator system will be presented, along with the results obtained during the commissioning process.  
slides icon Slides MOBB1 [6.596 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOBB1  
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MOAD1 Development of High Gradient RF System for J-PARC Upgrade cavity, impedance, operation, proton 50
 
  • C. Ohmori, K. Hara, K. Hasegawa, M. Toda, M. Yoshii
    KEK, Ibaraki, Japan
  • M. Nomura, T. Shimada, F. Tamura, M. Yamamoto
    JAEA/J-PARC, Tokai-mura, Japan
  • A. Schnase
    GSI, Darmstadt, Germany
  
  A new 5-cell cavity has been developed for the upgrade of the J-PARC Main Ring. In the cavity, high impedance magnetic alloy - Finemet FT3L, cores are loaded. The cavity was installed and has been used for the 250 kW beam operation. The cavity is operated with the RF voltage of 70 kV which is two times higher voltage than the present cavities. Eight more cavities will be assembled and installed in the next two years to increase the repetition rate of the Main Ring. This paper describes status of cavity operation under the beam loading and status of the mass productions of the cavities.  
slides icon Slides MOAD1 [2.551 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOAD1  
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MOPWA042 Sub-fs Electron Bunch Generation Using Magnetic Compressor at SINBAD electron, simulation, plasma, laser 207
 
  • J. Zhu, R.W. Aßmann, U. Dorda, J. Grebenyuk, B. Marchetti
    DESY, Hamburg, Germany
  
  In order to achieve high quality electron beams by laser-driven plasma acceleration with external injection, sub-fs bunches with a few fs arrival-time jitter are required. SINBAD (Short Innovative Bunches and Accelerators at DESY) is a proposed dedicated accelerator research and development facility at DESY. One of the baseline experiment at SINBAD is ARES (Accelerator Research Experiment at SINBAD), which will provide ultra-short electron bunches of 100 MeV to one or two connected beam lines. We present start-to-end simulation studies of sub-fs bunches generation at ARES using a magnetic compressor with a slit. In addition, the design of a dogleg with tunable R56 for the second beamline is also presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA042  
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MOPJE019 Categorization and Estimation of Possible Deformation in Emittance Exchange based Current Profile Shaping cavity, emittance, wakefield, collective-effects 317
 
  • 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
  
  Funding: This work is partly supported by POSTECH BK21+ program and Argonne National Laboratory
Shaping the current profile is one of the important issues in collinear wakefield acceleration. In the emittance exchange based shaping technique, the shaped current profile seriously depends on the incoming beam and beam line parameters. To design the beam and beam line properly, it is important to estimate the deformation in the shaped current profile. There are several different deformation types whose level depend on deformation parameter. We categorize the possible deformation types and observe the deformation patterns of the current profile depending on its type and the deformation parameter. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE019  
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MOPJE077 Progress on Simulation of Fixed Field Alternating Gradient Accelerators simulation, closed-orbit, betatron, experiment 495
 
  • S.L. Sheehy
    JAI, Oxford, United Kingdom
  • A. Adelmann
    PSI, Villigen PSI, Switzerland
  • M. Haj Tahar, F. Méot
    BNL, Upton, Long Island, New York, USA
  • Y. Ishi, Y. Kuriyama, Y. Mori, M. Sakamoto, T. Uesugi
    Kyoto University, Research Reactor Institute, Osaka, Japan
  • D.J. Kelliher, S. Machida, C.R. Prior, C.T. Rogers
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  Fixed Field Alternating Gradient accelerators have been realised in recent decades thanks partly to computational power, enabling detailed design and simulation prior to construction. We review the specific challenges of these machines and the range of different codes used to model them including ZGOUBI, OPAL and a number of in-house codes from different institutes. The current status of benchmarking between codes is presented and compared to the results of recent characterisation experiments with a 150 MeV FFAG at KURRI in Japan. Finally, we outline plans toward ever more realistic simulations including space charge, material interactions and more detailed models of various components.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE077  
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MOPJE081 Longitudinal Stability in Multi-Harmonic Accelerating Cavities cavity, accelerating-gradient, cathode, controls 506
 
  • R.M. Jones, L.R. Carver
    UMAN, Manchester, United Kingdom
  • J.L. Hirshfield
    Yale University, Physics Department, New Haven, CT, USA
  • Y. Jiang
    Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA
  
  Accelerating cavities that excite multiple modes at integer harmonics of the fundamental frequency can potentially be used to limit the effects of rf breakdown and pulsed surface heating at high accelerating gradients. Understanding the longitudinal stability and the acceptance of such a cavity is important to their development and use. The general Hamiltonian for longitudinal stability in multi harmonic cavities is derived and the particle dynamics are explored.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE081  
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MOPMA035 Current Status of the GPU-accelerated ELEGANT GPU, simulation, collective-effects, lattice 623
 
  • I.V. Pogorelov, J.R. King
    Tech-X, Boulder, Colorado, USA
  • K.M. Amyx
    Sierra Nevada Corporation, Centennial, USA
  • M. Borland, R. Soliday
    ANL, Argonne, Ilinois, USA
  
  Funding: Work supported by the DOE Office of Science, Office of BES grant No. DE-SC0004585, and by Tech-X Corporation. This research used resources of the OLCF, supported under Contract DE-AC05-00OR22725.
Efficient implementation of general-purpose particle tracking on GPUs can bring significant performance benefits to large-scale tracking simulations and direct (tracking-based) accelerator optimization techniques. This presentation is an update on the current status of our work on accelerating Argonne National Lab’s particle accelerator simulation code ELEGANT [*] using CUDA-enabled GPU. We summarize the performance of beamline elements ported to GPU, and discuss optimization techniques for some important collective effects kernels. We also outline briefly our testing and code validation infrastructure within ELEGANT and present the latest results of scaling studies with realistic lattices of the GPU-accelerated version of the code.
* M. Borland, ‘‘elegant: A Flexible SDDS-compliant Code for Accelerator Simulation", APS LS-287, September 2000
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA035  
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MOPMA059 Lorentz boosted frame simulation of Laser wakefield acceleration using hybrid Yee-fft solver in quasi-3d geometry simulation, plasma, laser, wakefield 691
 
  • P. Yu, A.W. Davidson, V.K. Decyk, W.B. Mori, A. Tableman, F.S. Tsung
    UCLA, Los Angeles, California, USA
  • F. Fiuza, L.O. Silva, J. Vieira
    IPFN, Lisbon, Portugal
  • R.A. Fonseca
    ISCTE - IUL, Lisboa, Portugal
  • W. Lu, X.L. Xu
    TUB, Beijing, People's Republic of China
  
  We present results from a preliminary study on modeling Laser wakefield acceleration (LWFA) with OSIRIS in a Lorentz boosted frame using a quasi-3D algorithm. In the quasi-3D algorithm, the fields and currents are expanded into azimuthal harmonics and only a limited number of harmonics are kept. Field equations in (r,z) space are solved for a desired number of harmonics in φ. To suppress the numerical Cerenkov instability (NCI) that inevitably arises due to the relativistic plasma drift in the simulation, we use a hybrid Yee-FFT solver in which the field equations are solved in (kz, r) space, where \hat{z} is the drifting direction. Preliminary results show that high fidelity LWFA boosted frame simulations can be carried out with no evidence of the NCI. Good agreement is found when comparing LWFA boosted frame simulations in the full 3D geometry against those in the quasi-3D geometry. In addition, we discuss how the moving window can be combined with the hybrid Yee-FFT solver to further speed up the simulation. The results indicate that unprecedented speed ups for LWFA simulations can be achieved when combining the Lorentz boosted frame technique, the quasi-3D algorithm, and a moving window.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA059  
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MOPHA060 Feasibility Study on Measurement and Control of Relative Positioning for Nano-beam Collision laser, controls, alignment, superconducting-magnet 933
 
  • H. Matsunaga, H. Yoshioka
    Takenaka Corporation, Institute of Technology, Chiba, Japan
  • M. Masuzawa, Y. Ohsawa, R. Sugahara, H. Yamaoka
    KEK, Ibaraki, Japan
  
  In the SuperKEKB and future International Linear Collider project, it is required to measure and control an offset of very small beams with a precision of several nanometers at the interaction point. This paper is a feasibility study on measuring and controlling nano-order relative position by using a laser interferometer and a piezoelectric stage. The first part shows that the precision of measurement position about a direction of laser radiation is less than or equal to 1 nanometer in frequency region less than 100Hz. The second part is discussed a measurement of relative displacement between two points which are 10 meter away on substructures located at the interaction point in the SuperKEKB. To compare with difference of accelerometers for reference, a relative displacement measurement with a precision of several nanometers by a laser interferometer became clear. The final part is discussed a relative positioning control by using a Piezo-Stage between two points on active vibration isolation tables. We achieved to control a relative displacement below 2 nanometers in frequency region less than 10Hz.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPHA060  
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MOPTY003 Measurement of Momentum Spread of the Injection Beam with Longitudinal Tomography Method in the J-PARC RCS linac, injection, operation, synchrotron 944
 
  • M. Yoshimoto, H. Harada, H. Hotchi, M. Kinsho, P.K. Saha, F. Tamura, M. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  
  In the J-PARC RCS, the beam tuning toward the design output beam power of 1MW were started after the completing of the beam energy and beam current upgrades in the LINAC. One of the important issues to achieve the 1MW beam operation is the optimization of the injection beam from the LINAC. Due to the longitudinal beam tuning in the LINAC, the momentum spread of the injected beam into the RCS was measured with the longitudinal tomography method. Our longitudinal tomography tool had been developed using the simple algorithm with the Convolution Back-Projection (CBP) method for the beam storage mode of the RCS. Accordingly, we improved this tool to expand into the acceleration mode.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY003  
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MOPTY025 High-current RFQ Design Study on RAON rfq, emittance, cavity, ion 990
 
  • J. Bahng, E.-S. Kim
    Kyungpook National University, Daegu, Republic of Korea
  • B.H. Choi
    IBS, Daejeon, Republic of Korea
  
  Rare isotope Accelerator Of Newness (RAON) heavy ion accelerator has been designed as a facility for a rare isotepe accelerator of the Rare Isotope Science Project (RISP). RAON provides 400 kW CW heavy ion beams from proton to uranium to support researches in various science fields. The RAON system consists of a few ECR ion source, low energy beam transport systems (LEBTs), CW radio frequency quadrupole (RFQ) accelerators, a medium energy beam transport and superconducting linac. We present the design study of the RFQ accelerator from 30 keV/u to 1.5 MeV/u of deuteron beam with meeting a requirement of over 15 mA beam at the target. We optimized the normal conducting CW RFQ accelerator that has a high transmission and a low longitudinal emittance. In this paper, we will present the design result of RFQ beam dynamics studies and its 2D and 3D EM analysis.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY025  
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MOPWI025 Phase and Amplitude Tuning Algorithms for the FRIB Superconducting Cavities cavity, linac, simulation, SRF 1207
 
  • Y. Zhang, P. Chu, Z.Q. He
    FRIB, East Lansing, Michigan, USA
  
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
FRIB driver linac will deliver all heavy ion beams up to uranium with energy above 200 MeV/u, and maximum beam power on target 400 kW for nuclear physics research. Phase and amplitude tuning of the FRIB superconducting cavities – totally about 330 of them, are important to the linac beam commissioning at low power and normal operation at high power. Because relatively low beam energy and high acceleration gradient, beam velocity changes significantly in the cavity RF gaps and the beam bunch cannot preserve perfectly in the further downstream beam diagnostics systems, beam longitudinal tuning algorithms are studied for different FRIB cavities and at different beam energy, which include the acceleration cavities as well as the re-buncher cavities. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI025  
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TUYC3 Scaling Down Synchronous Acceleration: Recent Results, Current Status, and Future Plans of a Subrelativistic Dielectric Laser Acceleration Project electron, laser, experiment, focusing 1325
 
  • J.C. McNeur, P. Hommelhoff, M. Kozak, A. Li, N. Schönenberger, A.D. Tafel
    University of Erlangen-Nuremberg, Erlangen, Germany
  
  This talk will describe the latest results using laser powered dielectric accelerators. Recent experiments in the US (SLAC) and Europe (MPQ) have fabricated dielectric accelerators powered with optical lasers and used them to accelerate electrons with gradients between 25 and 300 MeV/m. The latest results will be reviewed and prospects and applications for the future will be discussed.  
slides icon Slides TUYC3 [21.295 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUYC3  
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TUBB3 Recent Progress of J-PARC RCS Beam Commissioning - Toward Realizing the 1-MW Output Beam Power injection, scattering, operation, quadrupole 1346
 
  • H. Hotchi
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  
  Via a series of the injector linac upgrades in 2013 and 2014, the J-PARC RCS got all the design parameters. Thus the RCS is now in the final beam commissioning phase aiming for the 1-MW design output beam power. This paper presents the recent progress of the RCS beam commissioning, mainly focusing on our approaches to beam loss issues that appeared on the process of the beam power ramp-up.  
slides icon Slides TUBB3 [2.299 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUBB3  
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TUBD1 Optics Measurement and Correction during Acceleration with Beta-squeeze in RHIC optics, quadrupole, injection, emittance 1380
 
  • C. Liu, A. Marusic, M.G. Minty
    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.
In the past, beam optics correction at RHIC has only taken place at injection and at final energy, with interpolation of corrections partially into the acceleration cycle. Recent measurements of the beam optics during acceleration and squeeze have evidenced significant beta-beats that, if corrected, could minimize undesirable emittance dilutions and maximize the spin polarization of polarized proton beams by avoiding the high-order multipole fields sampled by particles within the bunch. We recently demonstrated successfully beam optics corrections during acceleration at RHIC. We verified conclusively the superior control of the beam realized via these corrections. As a valuable by-product, these corrections have minimized the beta-beat at the profile monitors, so providing more precise measurements of the evolution of the beam emittances during acceleration. 		 
slides icon Slides TUBD1 [1.581 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUBD1  
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TUPJE008 Relocation and Improvement Status of the SCSS Test Accelerator to Provide Dual FEL Drivers at SACLA undulator, linac, electron, laser 1626
 
  • Y. Otake
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  
  To increase user experiment chances at SACLA, Equipping a new beamline and an additional linac as a further FEL driver is effective. For this reason, the SCSS test accelerator as the prototype of SACLA is reused and improved, because of terminating its role. SCSS with an electron beam energy of 250 MeV generated an extreme ultraviolet laser with 50-60 nm. We relocated SCSS into the SACLA undulator hall and improved its performance. Three newly designed C-band accelerator-units for the relocated SCSS accelerator with an acceleration gradient of 47 MeV/m at maximum boost an electron beam energy of up to 420 MeV. By FEL simulation, the EUV-FEL with 30-40 nm and 100 uJ are expected in conditions of the electron energy and 2 modified undulators with 5 m long each. As a further capability, the relocated SCSS accelerator has space to add 9 C-band accelerator units and 2 undulators and the units increase a beam energy of up to 1.4 GeV, as which can generate a soft X-ray FEL. The relocation of the accelerator was finished in the summer of 2014 and its RF conditioning was now started. This paper describes the relocation and improvement status of the modified SCSS accelerator.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE008  
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TUPMA033 A Bunch Compression Method for Free Electron Lasers that Avoids Parasitic Compressions electron, dipole, laser, FEL 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 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPMA033  
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TUPMA036 First e-/Photon Commissioning Results for the GlueX Experiment/Hall D at CEBAF photon, radiation, detector, target 1916
 
  • M.D. McCaughan, J. F. Benesch, Y. Roblin, T. Satogata
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Experimental Hall D, with flagship experiment GlueX, was constructed as part of the 12 GeV CEBAF upgrade. A new magnetically extracted electron beam line was installed to support this hall. Bremsstrahlung photons from retractable radiators, are delivered to the experiment through a series of collimators following a long drift to allow for beam convergence. Coherent Bremsstrahlung generated by interaction with a diamond radiator will achieve a nominal 40% linear polarization and photon energies between 8.5 and 9 GeV from 12.1 GeV electrons, which are then tagged or diverted to a medium power 60kW electron dump. The expected photon flux is 107-108 Hz. This paper discusses the experimental line design, commissioning experience gained since first beam in spring 2014, and the present results of beam commissioning by the experiment. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPMA036  
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TUPTY010 The Luminosity Reduction with Hourglass Effect and Crossing Angle in an e-p Collider luminosity, collider, electron, proton 2016
 
  • Y.M. Peng
    IHEP, Beijing, People's Republic of China
  • Y. Zhang
    JLab, Newport News, Virginia, USA
  
  This paper derived the luminosity reduction caused by crossing angle and hourglass effect in an asymmetric collision. Here, we gave the general expressions of the geometrical reduction factor of luminosity for the asymmetric case caused by crossing angle and hourglass effect, for tri-Gaussian bunches colliding. We also gave it simple expression in some special cases to recover the earlier results, such as the formulas for only hour-glass effect exist and only crossing angle exist. The expressions used in e-p collider are also analysed in detail.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY010  
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TUPWI033 Matching into the Helical Bunch Coalescing Channel for a High Luminosity Muon Collider emittance, simulation, luminosity, collider 2315
 
  • A.V. Sy, Y.S. Derbenev, V.S. Morozov
    JLab, Newport News, Virginia, USA
  • C.M. Ankenbrandt, R.P. Johnson
    Muons, Inc, Illinois, USA
  • D.V. Neuffer, K. Yonehara, C.Y. Yoshikawa
    Fermilab, Batavia, Illinois, USA
  
  Funding: This work was supported in part by U.S. DOE STTR Grant DE-SC0007634. This manuscript has been authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
For high luminosity in a muon collider, muon bunches that have been cooled in the six-dimensional helical cooling channel (HCC) must be merged into a single bunch and further cooled in preparation for acceleration and transport to the collider ring. The helical bunch coalescing channel has been previously simulated [*, **] and provides the most natural match from helical upstream and downstream subsystems. This work focuses on the matching from the exit of the multiple bunch HCC into the start of the helical bunch coalescing channel. The simulated helical matching section simultaneously matches the helical spatial period λ in addition to providing the necessary acceleration for efficient bunch coalescing. Previous studies assumed that the acceleration of muon bunches from p=209.15 MeV/c to 286.816 MeV/c and matching of λ from 0.5 m to 1.0 m could be accomplished with zero particle losses and zero emittance growth in the individual bunches. This study demonstrates nonzero values for both particle loss and emittance growth, and provides considerations for reducing these adverse effects to best preserve high luminosity.
*C. Yoshikawa, et al., “Bunch Coalescing in a Helical Channel,” MAP-doc-4302-v2.
**C. Yoshikawa, et al., “Bunch Coalescing in a Helical Channel,” IPAC12 TUPPD013, New Orleans, Louisiana, USA. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI033  
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WEAD1 Commissioning and Recent Experimental Results at the Argonne Wakefield Accelerator Facility (AWA) wakefield, experiment, electron, laser 2472
 
  • M.E. Conde, D.S. Doran, W. Gai, G. Ha, W. Liu, J.G. Power, J.H. Shao, D. Wang, C. Whiteford, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
  • S.P. Antipov, C.-J. Jing, J.Q. Qiu
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • G. Ha
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  • J.H. Shao, D. Wang
    TUB, Beijing, People's Republic of China
  
  Funding: Work supported by the U.S. Department of Energy under contract No. DE-AC02-06CH11357.
The commissioning of the upgraded AWA facility has been recently completed. The L-band electron gun has been fully commissioned and has been successfully operated with its Cesium Telluride photocathode at a gradient of 80 MV/m. Single bunches of up to 100 nC, and bunch trains of up to 32 bunches have been generated. The six new pi-mode accelerating cavities bring the beam energy to 75 MeV. Initial measurements of the beam parameters have been performed. This intense beam has been used to drive high gradient wakefields in several structures. A second beamline provides electron bunches to probe the wakefields generated by the intense drive beam. One of the main goals of the facility is to generate short RF pulses with GW power levels, corresponding to accelerating gradients of hundreds of MV/m and energy gains on the order of 100 MeV per structure. 		 
slides icon Slides WEAD1 [2.091 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEAD1  
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WEPWA018 Re-acceleration of Ultra Cold Muon in J-PARC MLF linac, rfq, proton, experiment 2532
 
  • M. Yoshida, F. Naito
    KEK, Ibaraki, Japan
  • S. Artikova, Y. Kondo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • K. Torikai
    Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
  
  Funding: MEXT KAKENHI Grant Number 6108718
The ultra cold muon beam by two-photon laser resonant ionization of muonium atoms is unique way to obtain very low emittance muon beam. Its muon source is a surface muon from the muon target in MLF where one percent proton beam from J-PARC RCS is reacted. In close collaboration with the Muon Science Es- tablishment (MUSE) at Material and Life science experi- mental Facility (MLF) of the Japan Proton Accelerator Re- search Complex (J-PARC), we are developing the reacceleration system of the ultra cold muon beam. Its optimum accelerating structure is similar to a proton accelerator in low beta part and an electron accelerator in high beta part. Further the muon bunch is only two bunch corresponding to the bunch structure of the J-PARC RCS. Thus we are testing the dielectric transmission line accelerator based on the photoconductive switch as the altenative acceleration method. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA018  
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WEPWA023 Development of Muon LINAC for the Muon g-2/EDM Experiment at J-PARC target, rfq, cavity, experiment 2541
 
  • M. Otani, Y. Fukao, T. Mibe, N. Saito, M. Yoshida
    KEK, Tsukuba, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  
  The muon anomalous magnetic moment (g-2) and electric dipole moment (EDM) are one of the effective paths to beyond Standard Model of elementary particle physics. The E34 experiment aims to measure g-2 with a precision of 0.1 ppm and search EDM with a sensitivity to 10-21 e*cm with high intensity proton driver at J-PARC and a newly developed novel technique of the ultra-cold muon beam. The ultra-cold muons, which are generated from surface muons by the thermal muonium production and laser ionization, are accelerated to 300 MeV/c by muon linear accelerator. The muon LINAC consists of RFQ and following three types of the RF cavities. The muon acceleration to this energy will be the first case in the world. This poster reports about status of the initial acceleration test with RFQ and the development of the RF cavities, especially for the middle beta section.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA023  
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WEPWA038 Mode Transformation in Waveguide with Transversal Boundary Between Vacuum and Partially Dielectric Area vacuum, wakefield, radiation, electron 2581
 
  • A.A. Grigoreva, T.Yu. Alekhina, S.N. Galyamin, A.V. Tyukhtin
    Saint-Petersburg State University, Saint-Petersburg, Russia
  
  We consider the mode transformation in a circular waveguide with a transversal boundary between a vacuum part and a part with a cylindrical dielectric layer and a vacuum channel. It is assumed that an incident mode can be both propagating and evanescent. Analysis is carried out with the using the mode decomposition technique. Numerical algorithm for calculating the mode transformation at an arbitrary channel radius is also developed. Typical dependences for the reflection and transmission coefficients on the channel radius are presented and discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA038  
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WEPWA040 Generation and Radiation of PHz Ring-Like Electron-Pulse Train electron, radiation, cathode, bunching 2587
 
  • F.H. Chao, C.H. Chen, Y.-C. Huang
    NTHU, Hsinchu, Taiwan
  • P.J. Chou
    NSRRC, Hsinchu, Taiwan
  
  In a superradiant FEL, the constructive interference of the radiation fields from a periodic electron-pulse train rapidly increases the radiation power at the harmonics of the pulse frequency with a narrow spectrum bandwidth. To generate radiation in the X-ray spectrum, the corresponding pulse frequency of the pre-bunched electron beam should be few tens or even few hundreds PHz. The repetition rate of electron pulses generated from an ordinary RF photoinjector is usually at 10-100 Hz. Even though a superconducting RF accelerator could further increase the repetition rate of electron pulses to few MHz, it is far below the pulse frequency required for a superradiant XFEL. In this paper, we study a technique to generate a PHz ring-like electron-pulse train from an RF photoinjector with a spatially modulated driver laser and a structured photocathode. Our simulation in PARMELA confirms the feasibility of generating such a structured electron-pulse train from the photoinjector. We present our study on the beam dynamics of the structured electron-pulse train during acceleration and the radiation behavior of it in the far field in comparison with that of an ordinary electron beam.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA040  
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WEPWA048 Design Studies and Commissioning Plans for PARS Experimental Program plasma, wakefield, electron, beam-loading 2612
 
  • Ö. Mete, K. Hanahoe, J. Wright, G.X. Xia
    UMAN, Manchester, United Kingdom
  • M. Dover, M. Wigram, J. Zhang
    University of Manchester, Manchester, United Kingdom
  • J.D.A. Smith
    Tech-X, Boulder, Colorado, USA
  
  Funding: Science and Technology Facilities Council and Cockcroft Institute Core Grant
PARS (Plasma Acceleration Research Station) is an electron beam driven plasma wakefield acceleration test stand proposed for VELA/CLARA facility in Daresbury Laboratory. In order to optimise various operational configurations, 2D numerical studies were performed by using VSIM for a range of parameters such as bunch length, radius, plasma density and positioning of the bunches with respect to each other for the two-beam acceleration scheme. In this paper, some of these numerical studies and considered measurement methods are presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA048  
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WEPWA051 Investigations into Dielectric Laser-Driven Accelerators using the CST and VSIM Simulation Codes electron, laser, simulation, vacuum 2618
 
  • Y. Wei, C.P. Welsch, G.X. Xia
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • K. Hanahoe, K. Hanahoe, O. Mete, G.X. Xia
    UMAN, Manchester, United Kingdom
  • J. Smith
    Tech-X, Boulder, Colorado, USA
  • Y. Wei, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: European Union’s 7th Framework Programme for research, development and demonstration under grant agreement no 289191 and the STFC Cockcroft core grant No.ST/G008248/1.
Dielectric laser-driven accelerators (DLAs) based on gratings structures confine the laser-induced accelerating field in a narrow vacuum channel where the electrons travel and are being accelerated. Recent proof-of-principle experiments have successfully demonstrated acceleration of electrons with accelerating gradients of up to 250 MV/m in such novel structures. This contribution presents detailed numerical studies into the acceleration of relativistic and non-relativistic electrons in double gratings silica structures. The optimization of these structures with regards to maximum acceleration efficiency for different spatial harmonics is discussed. Simulations were carried out using the commercial CST and VSIM simulation codes and results from both codes are shown in comparison. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA051  
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WEPWA053 First Acceleration in a Resonant Optical-Scale Laser-Powered Structure laser, electron, alignment, timing 2624
 
  • R.B. Yoder
    Goucher College, Baltimore, Maryland, USA
  • R.J. England, Z. Wu
    SLAC, Menlo Park, California, USA
  • K.S. Hazra, B. Matthews, J.C. McNeur, E.B. Sozer, G. Travish
    UCLA, Los Angeles, USA
  • E.A. Peralta, K. Soong
    Stanford University, Stanford, California, USA
  
  Funding: U.S. DTRA grant HDTRA1-09-1-0043
The Micro-Accelerator Platform (MAP), an optical-scale dielectric laser accelerator (DLA) based on a planar resonant structure that was developed at UCLA, has been tested experimentally. Successful acceleration was observed after a series of experimental runs at SLAC’s NLCTA facility, in which the input laser power was well below the predicted breakdown limit. Though acceleration gradients were modest (<50 MeV/m), these are the first proof-of-principle results for a resonant DLA structure. We present more detailed results and some implications for future work. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA053  
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WEPWA060 Interaction of a Volumetric Metamaterial Structure with an Electron Beam electron, wakefield, radiation, coupling 2640
 
  • X.Y. Lu, M.A. Shapiro, R.J. Temkin
    MIT/PSFC, Cambridge, Massachusetts, USA
  
  Funding: The U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0010075 and the Air Force Office of Scientific Research under MURI Grant Number FA550-12-1-0489.
A volumetric metallic metamaterial structure with a cubic unit cell is introduced. The unit cells can naturally fill all of space without additional substrates or waveguides. The structure can support a negative longitudinal electric mode that can couple to an electron beam. The dispersion characteristics of the unit cell are modeled by the effective medium theory with spatial dispersion. The theory also predicts the correct resonant frequencies of the emitted radiation excited by an electron beam traversing the structure. In the wakefield simulations, a backward radiation pattern is observed. The proposed metamaterial can be applied to beam diagnostics and wakefield acceleration. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA060  
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WEPWA070 Considerations for an Efficient Terahertz-driven Electron Gun electron, gun, laser, controls 2664
 
  • F. Lemery, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • P. Piot
    Fermilab, Batavia, Illinois, USA
  
  We investigate a dispersion-controlled-acceleration scheme of low-energy electrons to mitigate phase slipping using a tapered dielectric lined waveguide (DLW). Our approach matches the velocity of an electron being accelerated in a slab-symmetric structure in a constant electric field. We also present first experimental results of a THz pulse propagating in a slab-symmetric DLW.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA070  
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WEPWA071 A Compact X-Ray Source Based on a Low-Energy Beam-Driven Wakefield Accelerator electron, wakefield, laser, bunching 2667
 
  • F. Lemery, D. Mihalcea, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • K. Chouffani
    IAC, Pocatello, Idaho, USA
  • P. Piot
    Fermilab, Batavia, Illinois, USA
  
  Accelerator-based X-ray sources have led to many scientific breakthroughs. Yet, their limited availability in large national laboratory settings due to the required infrastructure is a major limitation to their disseminations to a larger user community. In this contribution we explore the use of a low-energy electron beam produced out of a photoinjector coupled to a dielectric structure to produce a higher energy (~10-20 MeV) beam via a beam-driven acceleration scheme. The accelerated beam can then be used to produce X-ray via inverse Compton scattering. This paper discusses the concept and presents start-to-end simulations of the proposed setup.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA071  
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WEPWA072 Feasibility of Continuously Focused TeV/m Channeling Acceleration with CNT-Channel plasma, electron, wakefield, simulation 2670
 
  • Y.-M. Shin
    Northern Illinois University, DeKalb, Illinois, USA
  • A.H. Lumpkin, V.D. Shiltsev, R.M. Thurman-Keup
    Fermilab, Batavia, Illinois, USA
  
  Funding: This work was supported by the DOE contract No. DEAC02-07CH11359 to the Fermi Research Alliance LLC.
Atomic channels in crystals are known to consist of 10 – 100 V/Å potential barriers capable of guiding and collimating a high energy beam and continuously focused acceleration with exceptionally high gradients (TeV/m)*,**,***. However, channels in natural crystals are only angstrom-size and physically vulnerable to high energy interactions. Carbon-based nano-crystals such as carbon-nanotubes (CNTs) and graphenes have a large degree of dimensional flexibility and thermo-mechanical strength, which could be suitable for channeling acceleration of MW beams. Nano-channels of the synthetic crystals can accept a few orders of magnitude larger phase-space volume of channeled particles with much higher thermal tolerance than natural crystals****. Our particle-in-cell simulations with 100 um long effective CNT model indicated that a beam-driven self-acceleration produces 1 – 2 % net energy gain in the quasi-linear regime (off-resonance beam-plasma coupling, np = 1000 nb) with ASTA 50 MeV injector beam parameters. This paper presents current status of CNT-channeling acceleration experiment planned at the Advanced Superconducting Test Accelerator (ASTA) in Fermilab.
* T. Tajima, PRL 59, 1440 (1987)
** P. Chen and R. Noble, slac-pub-4187
*** Y. M. Shin, APL 105, 114106 (2014)
**** Y.M. Shin, D. A. Still, and V. Shiltsev, Phys. Plasmas 20, 123106 (2013) 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA072  
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WEPJE012 Design and Optimisation of Dielectric Laser Deflecting Structures laser, electron, undulator, simulation 2698
 
  • K.P. Wootton, R.J. England, I.V. Makasyuk, Z. Wu
    SLAC, Menlo Park, California, USA
  • R.L. Byer, E.A. Peralta
    Stanford University, Stanford, California, USA
  • A.D. Tafel
    Friedrich-Alexander Universität Erlangen-Nuernberg, University Erlangen-Nuernberg LFTE, Erlangen, Germany
  
  Funding: This work was supported by the U.S. Department of Energy under Grants DE-AC02-76SF00515, and DE-FG02-13ER41970.
Recent experimental demonstrations of dielectric laser-driven accelerator structures offer a path to the miniaturisation of accelerators. In order to accelerate particles to higher energies using a staged sequence of accelerating structures, integrating compatible micrometre-scale transverse deflecting structures into these accelerators is necessary. Using simulations, the present work outlines the design and optimisation of a fused-silica laser-driven grating deflecting structure for relativistic electron beams. Implications for device fabrication and experiments are outlined. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPJE012  
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WEPJE013 A New Accelerating Mode in a Silicon Woodpile Structure and Its High-efficiency Power Coupler Design laser, coupling, simulation, electron 2702
 
  • Z. Wu, R.J. England, C. Lee, C.-K. Ng, K.P. Wootton
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by U.S. Department of Energy under Grants DE-AC02-76SF00515, DE-FG02-13ER41970 and by DARPA Grant N66001-11-1-4199.
Silicon woodpile photonic crystals provide a base structure that can be used to build a three-dimensional dielectric waveguide system for high-gradient laser-driven acceleration. A new woodpile waveguide design that hosts a phase synchronous, centrally confined accelerating mode with ideal Gaussian transverse profile is proposed. Comparing with previously discovered silicon woodpile accelerating modes, this mode shows advantages in better beam loading and higher achievable acceleration gradient. Several travelling-wave coupler design schemes developed for multi-cell RF cavity accelerators are adapted to the woodpile accelerator coupler design based on this new accelerating mode. A forward-wave-coupled, highly efficient silicon woodpile accelerator is achieved. Simulation shows high efficiency of over 70% of the drive laser power coupled to this fundamental woodpile accelerating mode, with less than 15% backward wave excitation. The estimated acceleration gradient, when the coupler structure is driven at the damage threshold fluence of silicon at its operating 1.506 um wavelength, can reach roughly 185 MV/m. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPJE013  
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WEPJE020 The Two Beam Acceleration Staging Experiment at Argonne Wakefield Accelerator Facility wakefield, experiment, timing, kicker 2714
 
  • C.-J. Jing, S.P. Antipov, A. Kanareykin, J.Q. Qiu
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • M.E. Conde, D.S. Doran, W. Gai, G. Ha, W. Liu, J.G. Power, J.H. Shao, D. Wang, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
  • J. Shi
    TUB, Beijing, People's Republic of China
  
  Funding: DoE SBIR Program
Staging, defined as the accelerated bunch in a wakefield accelerator continues to gain energy from sequential drive bunches, is one of the most critical technologies, yet be demonstrated, required to achieve high energy. Using the Two Beam Acceleration (TBA) beamline at Argonne Wakefield Accelerator facility, we will perform a staging experiment using two X-band TBA units. The experiment is planned to conduct in steps. We report on the most recent progress. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPJE020  
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WEPJE021 Fabrication and Demonstration of a Silicon Buried Grating Accelerator electron, laser, vacuum, simulation 2717
 
  • A.C. Ceballos, R.L. Byer, K.J. Leedle, E.A. Peralta, O. Solgaard, K. Soong
    Stanford University, Stanford, California, USA
  • R.J. England, I.V. Makasyuk, K.P. Wootton, Z. Wu
    SLAC, Menlo Park, California, USA
  • A. Hanuka
    Technion, Haifa, Israel
  • A.D. Tafel
    Friedrich-Alexander Universität Erlangen-Nuernberg, University Erlangen-Nuernberg LFTE, Erlangen, Germany
  
  Funding: Work supported by the U.S. Department of Energy under Grants DE-AC02-76SF00515, DE-FG06-97ER41276.
Using optical electromagnetic fields in dielectric microstructures, we can realize higher-energy accelerator systems in a more compact, low-cost form than the current state-of-the-art. Dielectric, laser-driven accelerators (DLA) have recently been demonstrated using fused silica structures to achieve about an order-of-magnitude increase in accelerating gradient over conventional RF structures.* We leverage higher damage thresholds of silicon over metals and extensive micromachining capability to fabricate structures capable of electron acceleration. Our monolithic structure, the buried grating, consists of a grating formed on either side of a long channel via a deep reactive ion etch (DRIE).** The grating imposes a phase profile on an incoming laser pulse such that an electron experiences a net change in energy over the course of each optical cycle. This results in acceleration (or deceleration) as electrons travel down the channel. We have designed and fabricated such structures and begun testing at the SLAC National Accelerator Laboratory. We report on the progress toward demonstration of acceleration in these structures driven at 2um wavelength.
* E.A. Peralta et al., Nature 503 (2013)
** C.M. Chang and O. Solgaard, Appl. Phys. Lett. 104 (2014) 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPJE021  
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WEPJE024 Progress on the Study of Direct Laser Electron Acceleration in Density-Modulated Plasma Waveguides electron, plasma, laser, simulation 2723
 
  • M.W. Lin, B.W. Morgan
    The Pennsylvania State University, University Park, Pennsylvania, USA
  • S.-H. Chen, C.-Y. Hsieh, Y.-L. Liu
    NCU, Chung Li, Taiwan
  • I. Jovanovic
    Penn State University, University Park, Pennsylvania, USA
  
  Funding: This work is supported by the United States Defense Threat Reduction Agency through contract HDTRA1-11-1-0009 and the Ministry of Science and Technology in Taiwan by Grant No. MOST103-2112-M-008-004.
Direct laser acceleration of electrons can be achieved by utilizing the axial field of a guided, radially polarized laser pulse in a density-modulated plasma waveguide*. When a short fs electron bunch is injected, our particle-in-cell simulations show that the electrostatic field, arising from plasma electrons perturbed by the laser ponderomotive force, increases the transverse divergence of the bunch electrons**. Simulations are performed to study the method in which a precursor electron bunch is introduced prior to the main accelerated bunch. The precursor induces a focusing electrostatic field in the background plasma, which can considerably reduce the transverse expansion of the accelerated electrons. Based on the ignitor-heater scheme, density-modulated plasma waveguides are produced in experiments with high-Z gas targets and used to test the guiding of laser pulses. Supersonic gas jet nozzles for producing gas targets are simulated, designed, and then fabricated via direct digital deposition manufacturing. Surface quality of the nozzles and the produced gas target density profiles are evaluated with computerized tomography and optical interferometry, respectively.
* A. G. York, et al., Phys. Rev. Lett. 100, 195001 (2008).
** M.-W. Lin et al., Phys. Plasmas 21, 093109 (2014)
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPJE024  
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WEPMA031 Timing Jitter Studies for sub-fs Electron Bunch Generation at SINBAD laser, electron, gun, simulation 2826
 
  • J. Zhu, R.W. Aßmann, U. Dorda, J. Grebenyuk, B. Marchetti
    DESY, Hamburg, Germany
  
  Generation of ultra-short electron bunches with a few femtoseconds arrival-time jitter is the major challenge in plasma acceleration with external injection. Meanwhile, peak current stability is also one of the crucial factors for user experiments when the electron bunch is used for free-electron laser (FEL) generation. ARES (Accelerator Research Experiment at SINBAD) will consist of a compact S-band normal-conducting photo-injector providing ultra-short electron bunches of 100 MeV. We present bunch arrival-time jitter studies for two different compression schemes, velocity bunching and magnetic compression with a slit, at ARES with start-to-end simulations. Contributions from various jitter sources are quantified.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA031  
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WEPMA060 The Development of Cavity Frequency Tracking Type RF Control System for SRF-TEM cavity, SRF, LLRF, electron 2914
 
  • N. Higashi
    The University of Tokyo, Graduate School of Science, Tokyo, Japan
  • A. Enomoto, Y. Funahashi, T. Furuya, X.J. Jin, Y. Kamiya, S. Michizono, M. Nishiwaki, H. Sakai, M. Sawabe, K. Ueno, M. Yamamoto
    KEK, Ibaraki, Japan
  • M. Kuriki
    HU/AdSM, Higashi-Hiroshima, Japan
  • S. Yamashita
    ICEPP, Tokyo, Japan
  
  Superconducting accelerating cavities used in high-energy accelerators can generate high electric fields of several 10 MV/m by supplying radio frequency waves (RF) with frequencies matched with resonant frequencies of the cavities. Generally, frequencies of input RFs are fixed, and resonant frequencies of cavities that are fluctuated by Lorentz force detuning and Microphonics are corrected by feedbacks of cavity frequency tuners and input RF power. Now, we aim to develop the cavity frequency tracking type RF control system where the frequency of input RF is not fixed and consistently modulated to match the varying resonant frequency of the cavity. In KEK (Tsukuba, Japan), we are developing SRF-TEM that is a new type of transmission electron microscope using special-shaped superconducting cavity. By applying our new RF control system to the SRF-TEM, it is expected to obtain stable accelerating fields so that we can acquire good spatial resolution. In this presentation, we will explain the required stabilities of accelerating fields for SRF-TEM and the feasibility of SRF-TEM in the case of applying the cavity frequency tracking type RF control system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA060  
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WEPMN024 Exploration of Multi-fold Symmetry Element-loaded Superconducting Radio Frequency Structure for Reliable Acceleration of Low- & Medium-Beta Ion Species cavity, SRF, RF-structure, ion 2978
 
  • S.C. Huang
    IMP/CAS, Lanzhou, People's Republic of China
  • R.L. Geng
    JLab, Newport News, Virginia, USA
  
  Reliable acceleration of low- to medium-beta proton or heavy ion species is needed for future high current superconducting radio frequency accelerators. Due to the high-Q nature of a superconducting RF resonator, it is sensitive to many factors such as loading variation (from either the accelerated beam or from parasitic field emitted electrons), mechanical vibration, and liquid helium bath pressure fluctuation etc. To increase the stability against those factors, a mechanically strong and stable RF structure is desirable. Guided by this consideration, multi-fold symmetry element-loaded superconducting radio frequency structures, cylindrical tanks with multiple (n>=3) rod-shaped radial elements, are being explored. The top goal of its optimization is to improve mechanical stability. A natural consequence of this structure is a lowered ratio of the peak surface electromagnetic field to the acceleration gradient as compared to the traditional spoke cavity. A disadvantage of this new structure is an increased size for a fixed resonant frequency and optimal beta. This paper describes the optimization of EM design and preliminary mechanical analysis for such structures.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN024  
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WEPHA015 Beam Tests Using a Wide Band RF System Prototype in the CERN PS Booster cavity, HLRF, electronics, booster 3134
 
  • M.M. Paoluzzi, M.E. Angoletta, A. Findlay, M. Haase, M. Jaussi, A.J. Jones, J.C. Molendijk, J. Sanchez-Quesada
    CERN, Geneva, Switzerland
  
  In the framework of the LHC Injectors Upgrade project (LIU) and in view of a complete replacement of the existing CERN PS Booster (PSB) RF systems, a small scale, wide band prototype cavity was installed in 2012 in the machine. Following the encouraging tests done using this limited set up, an almost full scale, RF system prototype has been built and installed in the PSB during the Long Shutdown 1 (LS1). This modular, Finemet® loaded system covers the band 0.5 / 4 MHz corresponding to the h=1 and h=2 frequency ranges. It uses solid-state power stages and includes fast RF feedback for beam loading compensation. New dedicated digital low level electronics have been implemented for all loops required for beam acceleration and interfaces with the general PSB control system. It allows using the new equipment at the fundamental and/or second harmonic of the beam revolution frequency as well as operating it in parallel with the existing RF systems. This paper describes the low level and power sections of the project and reports about the achieved results and experience built up so far.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPHA015  
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WEPTY002 Studies into Electron Beam Generation, Acceleration and Diagnostics within LA³NET laser, network, electron, diagnostics 3256
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  The Laser Applications at Accelerators Network (LA³NET) is receiving funding of up to 4.6 M€ from the European Union within the 7th Framework Programme to carry out R&D into laser-based particle sources, laser acceleration schemes and laser-based beam diagnostics. This international network joins universities, research centres and private companies and has been training 19 early stage researchers at network nodes across Europe since 2011. This contribution presents research outcomes from LA³NET’s main work packages, covering electron beam generation, acceleration and diagnostics. Results from surface studies of photocathodes for photo injector applications in the framework of the CLIC project are presented along with information about expected accelerating gradients in dielectric laser-driven accelerators as identified for non-relativistic and relativistic electron beams using the CST and VSIM simulation codes. Initial results from energy measurements using Compton backscattering at the ANKA Synchrotron at KIT are also presented. In addition, a summary of recent and upcoming international events organized by the LA³NET consortium is also given.
This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289191. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY002  
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WEPTY065 Quadrupole Magnet for a Rapid Cycling Synchrotron quadrupole, dipole, simulation, synchrotron 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. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY065  
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WEPWI046 Demonstration of Coaxial Coupling Scheme at 26 MV/m for 1.3 GHz TESLA-type SRF Cavities cavity, coupling, niobium, SRF 3594
 
  • Y. Xie, A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • T.N. Khabiboulline, A. Lunin, V. Poloubotko, A.M. Rowe, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • J. Rathke
    AES, Medford, New York, USA
  
  Funding: Work sponsored by DOE SBIR Grant DE-SC0002479.
We will report the first successful rf test of a detachable coaxial coupler by Euclid Techlabs and Fermilab SRF development department. The coaxial coupling method has vast advantages compared with ordinary welded-on couplers. It totally eliminates coupler kicks and it is detachable and easy to clean. We reached 26 MV/m (no hard quench limit) with a quarter-wave detachable coaxial coupler. This is also a demonstration of the highest field gradient ever reached with a superconducting joint. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWI046  
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THPF008 U28+ Intensity Record Applying a H2-Gas Stripper Cell operation, target, ion, heavy-ion 3693
 
  • W.A. Barth, A. Adonin, Ch.E. Düllmann, M. Heilmann, R. Hollinger, E. Jäger, J. Khuyagbaatar, J. Krier, H. Vormann, A. Yakushev
    GSI, Darmstadt, Germany
  • P. Scharrer
    HIM, Mainz, Germany
  
  Meeting the FAIR science requirements higher beam intensity has to be achieved in the present GSI-accelerator complex. An advanced upgrade program for the UNILAC aimed to meet the FAIR requirements. Stripping is a key technology for all heavy ion accelerators. For this an extensive research and development program was carried out to optimize for high brilliance heavy ion operation. After upgrade of the supersonic N2-gas jet, implementation of high current foil stripping and preliminary investigation of H2 gas jet operation, recently a newly developed H2 gas cell uses a pulsed gas regime synchronized with arrival of the beam pulse. An obviously enhanced stripper gas density as well as a simultaneously reduced gas load for the pumping system result in an increased stripping efficiency, while the beam emittance remains the same. A new record intensity (7.8 emA) for U28+ beams at 1.4 MeV/u has been achieved applying the pulsed high density H2 stripper target, while the MeVVa ion source with a newly developed extraction system delivered a high intensity U4+ beam. The experimental results will be presented in detail.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF008  
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THPF017 Design Studies for the Proton-Linac RFQ for FAIR rfq, proton, linac, simulation 3718
 
  • M. Vossberg, R. M. Brodhage, M. Kaiser, F. Maimone, W. Vinzenz, S. Yaramyshev
    GSI, Darmstadt, Germany
  
  The planned 27 m long Proton-Linac (P-LINAC) for FAIR (Facility for Antiproton and Ion Research) comprises a RFQ (Radio-Frequency Quadrupole) and 6 CH-cavities to accelerate a 70 mA proton beam up to 70 MeV. The FAIR Proton-Linac starts with a 325.2 MHz, from 95keV to 3 MeV RFQ accelerator. The main RFQ for this Proton-Linac will be a 4-Vane RFQ. RF analytics with varying and constant transverse focusing strengt for the electrode parameters will be used. CST simulations will help to find cavity parameters for the working frequency. This paper presents the main cavity designs concepts and CST simulation results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF017  
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THPF030 Antiproton Acceleration and Deceleration in the HESR antiproton, target, lattice, dipole 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF030  
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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, dipole 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF035  
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THPF036 Compact Cyclotron for 35 MeV Protons and 8 AMeV of H2+ cyclotron, proton, ion, extraction 3776
 
  • A. Calanna, L. Calabretta
    INFN/LNS, Catania, Italy
  • T. Boiesan, R.R. Johnson, L. AC. Piazza, V. Sabaiduc
    BCSI, Vancouver, BC, Canada
  
  The design characteristics and parameters of a compact cyclotron able to accelerate H− ions up to an energy of 35 MeV and H2+ ions up to an energy of 8 AMeV are presented. This cyclotron is a 4 sector machine and its special feature is the possibility to modify the profiles of the sector hills to allow for the acceleration of the two different species. When equipped with two RF cavities and operated in harmonic mode 4, it accelerates the H− beam, which is extracted by stripping. The resulting proton beam is used for the commercial goal of radioisotope production. On the other hand, when equipped with four RF cavities, also operated in harmonic mode 4, it accelerates a high intensity H2+ beam that is of interest for the IsoDAR* experiment. Here, the presented cyclotron takes on the role of a prototype for the central region design of the final IsoDAR* cyclotron (60 A MeV H2+). By increasing the number of cavities, the energy gain per turn as well as the vertical focusing along the first orbit are increased, thereby optimizing the acceptance. Moreover, to minimize space-charge effects, the injection energy of H2+ is raised to 70 keV compared to the H− injection energy of 40 keV.
arXiv:1307.2949 Whitepaper on the DAEδALUS Program. The DAEδALUS Collaboration 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF036  
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THPF045 Simulation Study of Muon Acceleration using RFQ for a New Muon g-2 Experiment at J-PARC rfq, simulation, experiment, emittance 3801
 
  • Y. Kondo, K. Hasegawa
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • T. Mibe, M. Otani, N. Saito
    KEK, Tsukuba, Japan
  
  A new muon g-2 experiment is planning at J-PARC. In this experiment, ultra cold muons will be generated and accelerated using a linear accelerator. As the first accelerating structure, an RFQ will be used. We are planning to use a spare RFQ of the J-PARC linac for the first acceleration test. We present simulation studies of this acceleration test. A design study of a muon dedicated RFQ is also shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF045  
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THPF047 New Series of RFQ Vane Shapes focusing, multipole, quadrupole, rfq 3808
 
  • Y. Iwashita, Y. Fuwa
    Kyoto ICR, Uji, Kyoto, Japan
  
  New series of RFQ vane shapes are under investigation by introducing more terms in addition to the two term potential. Because they can incorporate with the feature of the trapezoidal shape modulation with less multipole components, higher acceleration efficiency is expected. The simulation study will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF047  
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THPF112 A New Beam Injection Scheme for the Fermilab Booster injection, booster, simulation, emittance 3976
 
  • C.M. Bhat
    Fermilab, Batavia, Illinois, USA
  
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy
Here we present an improved beam injection scheme for the Fermilab Booster. The beam is injected on the deceleration part of the standard sinusoidal magnetic ramp and beam capture takes place almost immediately after the injection process, before the beam is fully de-bunched. During the entire capture process we impose in a changing field with changing from negative to zero to positive values. Our simulations clearly showed that this method of beam capture is more efficient to preserve longitudinal beam emittance at the early part of the acceleration cycle and helps to keep the required rf voltage to an optimal value of 15% lower than the current operational values. As a result of the reduced emittance growth at the early part of the Booster cycle we observe reduced required rf power on a typical Booster cycle by ~30%, which is quite important from the point of rf power requirements during the Booster operation. Further, we investigate snap bunch rotation at extraction to provide beam with lower to the MI/RR to improve the proton beam slip-stacking efficiency. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF112  
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THPF129 The MICE Demonstration of Lonization Cooling lattice, emittance, radiation, cavity 4023
 
  • J. Pasternak, C. Hunt, J.-B. Lagrange, K.R. Long
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • V. Blackmore
    Imperial College of Science and Technology, London, United Kingdom
  • N.A. Collomb
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • V.C. Palladino
    INFN-Napoli, Napoli, Italy
  • R. Preece, J.S. Tarrant
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • C.T. Rogers
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • P. Snopok
    Fermilab, Batavia, Illinois, USA
  
  Funding: SFTC, DOE, NSF, INFN, CHIPP and more
Muon beams of low emittance provide the basis for the intense, well-characterised neutrino beams necessary to elucidate the physics of flavour at the Neutrino Factory and to provide lepton-antilepton collisions at energies of up to several TeV at the Muon Collider. The International Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling, the technique by which it is proposed to reduce the phase-space volume occupied by the muon beam at such facilities. In an ionization-cooling channel, the muon beam passes through a material (the absorber) in which it loses energy. The energy lost is then replaced using RF cavities. The combined effect of energy loss and re-acceleration is to reduce the transverse emittance of the beam (transverse cooling). A major revision of the scope of the project was carried out over the summer of 2014. The revised project plan, which has received the formal endorsement of the international MICE Project Board and the international MICE Funding Agency Committee, will deliver a demonstration of ionization cooling by September 2017. In the revised configuration a central lithium-hydride absorber provides the cooling effect. The magnetic lattice is provided by the two superconducting focus coils and acceleration is provided by two 201 MHz single-cavity modules. The phase space of the muons entering and leaving the cooling cell will be measured by two solenoidal spectrometers. All the superconducting magnets for the ionization cooling demonstration are available at the Rutherford Appleton Laboratory and the first single-cavity prototype is under test in the MuCool Test Area at Fermilab. The design of the cooling demonstration experiment will be described together with a summary of the performance of each of its components. The cooling performance of the revised configuration will also be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF129  
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