Keyword: booster
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MOPGW052 The Study of Single-Bunch Instabilities in the Ramping Process in the HEPS Booster impedance, simulation, lattice, injection 206
 
  • H.S. Xu, Y.M. Peng, N. Wang
    IHEP, Beijing, People’s Republic of China
  
  The booster of High Energy Photon Source (HEPS) is proposed to ramp the beam energy from 500 MeV to 6 GeV, and to deliver the required charge to the storage ring. However, the transverse single-bunch instability may limit the reachable bunch charge in the booster. The study of the transverse single-bunch instability has been carried out for the HEPS booster at both 500 MeV and 6 GeV to double check whether the required single-bunch charge can be achieved. Furthermore, the energy ramping process was recently included in the study. We concentrate in the analyses of the simulation results with the consideration of energy ramping process in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW052  
About • paper received ※ 15 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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MOPGW080 Optics Measurements in the CERN PS Booster Using Turn-by-Turn BPM Data optics, injection, MMI, software 285
 
  • A. Garcia-Tabares, P.K. Skowroński, R. Tomás
    CERN, Geneva, Switzerland
  • A. Garcia-Tabares
    Universidad Complutense Madrid, Madrid, Spain
  
  As part of the LHC Injector Upgrade Project the injection of the CERN PS Booster will be changed to increase intensity and brightness of the delivered beams. The new injection scheme is likely to give rise to beta beating above the required level of 5\% and new measurements are required. Achieving accurate optics measurements in PSB lattice is a challenging task that has involved several improvements in both hardware and software. This paper summarizes all the improvements that have been performed in the optics measurement acquisition system together with a brief summary of the first results obtained.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW080  
About • paper received ※ 11 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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MOPGW092 Design Status of DESY IV – Booster Upgrade for PETRA IV injection, emittance, insertion, linac 331
 
  • H.C. Chao
    DESY, Hamburg, Germany
  
  In PETRA IV project the on-axis injection scheme is preferred since there is no sufficient dynamic aperture for off-axis injection in ultra low emittance storage rings. The challenge is to prepare the injected bunches with the smaller emittance and larger intensity. The current injector complex including the accumulator and booster does not fulfill the requirements and thus will need refurbishments. The injector upgrade option chosen will be composed of an upgraded electron gun, a higher energy LINAC, and the new booster synchrotron DESY IV which has smaller emittance. DESY IV will be located in the existing tunnel of the current booster DESY II. The design of the lattice and some simulation results are addressed in this article.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW092  
About • paper received ※ 18 April 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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MOPMP014 NICA Accelerator Complex at JINR collider, dipole, proton, injection 452
 
  • E. Syresin, O.I. Brovko, A.V. Butenko, E.E. Donets, A.R. Galimov, E.V. Gorbachev, A. Govorov, V. Karpinsky, V. Kekelidze, H.G. Khodzhibagiyan, S.A. Kostromin, A.D. Kovalenko, O.S. Kozlov, I.N. Meshkov, A.V. Philippov, A.O. Sidorin, V. Slepnev, A.V. Smirnov, G.V. Trubnikov, A. Tuzikov, V. Volkov
    JINR, Dubna, Moscow Region, Russia
  
  Status of the project of NICA accelerator complex, which is under construction at JINR (Dubna, Russia), is presented. The main goal of the project is to provide ion beams for experimental studies of hot and dense baryon-ic matter and spin physics. The NICA collider will pro-vide heavy ion collisions in the energy range of √sNN=4/11 GeV at average luminosity of L=1.1027cm−2·s−1 for 197Au79+ nuclei and polarized proton collisions in energy range of √sNN=12/27 GeV at lumi-nosity of L ≥ 1031cm−2·s−1. NICA accelerator complex will consist of two injector chains, 578 MeV/u supercon-ducting (SC) booster synchrotron, the existing SC syn-chrotron (Nuclotron), and the new SC collider that has two storage rings each of 503 m circumference. Con-structing facility is based on Nuclotron-technology of SC magnets with iron yoke. Hollow SC cable cooled by two-phase He-flux used for operation with 10 kA currents and 1Hz cycling rate. Both stochastic and electron cooling methods are used for the beam accumulation and its stability maintenance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP014  
About • paper received ※ 29 April 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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MOPRB027 Progress of HEPS Accelerator System Design storage-ring, cavity, vacuum, lattice 633
 
  • P. He, J.S. Cao, F.S. Chen, J. Chen, H. Dong, D.Y. He, Y. Jiao, W. Kang, C.H. Li, J.Y. Li, F. Long, H.H. Lu, X. Qi, Q. Qin, H. Qu, J.Q. Wang, G. Xu, J.H. Yue, J. Zhang, J.R. Zhang, P. Zhang
    IHEP, Beijing, People’s Republic of China
  
  The 4th generation ring-based light sources, HEPS (High Energy Photon Source) 7BA lattice has been de-veloped at IHEP. This is 6Gev, 200mA machine which has horizontal emittance Ɛh around 60pm.rad to gain the high brilliance photon beam. this compact lattice design bring so many engineering challenges for accelerator magnets, vacuum components, beam diagnotice, etc. This paper will present the noval lattice design and subsystem design progress.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB027  
About • paper received ※ 14 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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MOPRB098 An Increased Extraction Energy Booster Complex for the Jefferson Lab Electron Ion Collider collider, electron, extraction, proton 797
 
  • E.A. Nissen
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The U.S. Government retains a non-exclusive, world-wide license to publish or reproduce this manuscript.
The proposed Jefferson Lab Electron Ion Collider (JLE-IC) envisions an ion complex composed of an ion linac, two booster synchrotrons and a collider ring. The evolving design of the JLEIC booster required an increase in the extraction energy of the booster from 8 to 12.1 GeV kinetic energy, necessitating two machines instead of one. The decision was also made to switch to warm magnets, thus increasing the total radius of the 8 GeV booster. The second booster is now the same size as the collider rings. In this work we present the new designs for JLEIC’s Low Energy Booster (LEB) and High Energy Booster (HEB). 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB098  
About • paper received ※ 14 May 2019       paper accepted ※ 18 May 2019       issue date ※ 21 June 2019  
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MOPTS065 Alternative Design of CEPC LINAC linac, positron, electron, collider 1005
 
  • C. Meng, J. Gao, X.P. Li, G. Pei, J.R. Zhang
    IHEP, Beijing, People’s Republic of China
  
  Circular Electron-Positron Collider (CEPC) is a 100 km ring e+ e− collider for a Higgs factory. The injector is composed of a Linac and a Booster. The baseline design of CEPC Linac is a normal conducting S-band linear accelerator with frequency in 2860 MHz, which can provide electron and positron beam at an energy up to 10 GeV and bunch charge up to 3 nC. To reduce the design difficulty of booster and booster magnet at low energy part, an alternative design of the Linac with C-band accelerating structure at high energy part is proposed and the energy is up to 20 GeV. The compre-hensive consideration of Linac design and damping ring design will be discussed. In this paper, the physics design of this scheme is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS065  
About • paper received ※ 16 May 2019       paper accepted ※ 19 May 2019       issue date ※ 21 June 2019  
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MOPTS087 Transverse Emittance Studies at Extraction of the CERN PS Booster emittance, optics, operation, injection 1058
 
  • F. Antoniou, S.C.P. Albright, F. Asvesta, H. Bartosik, G.P. Di Giovanni, V. Forte, M.A. Fraser, A. Garcia-Tabares, A. Huschauer, B. Mikulec, T. Prebibaj, A. Santamaría García, P.K. Skowroński
    CERN, Meyrin, Switzerland
  • F. Asvesta
    NTUA, Athens, Greece
  • T. Prebibaj
    National Technical University of Athens, Zografou, Greece
  
  Transverse emittance discrepancy in the beam transfer between the Proton Synchrotron Booster (PSB) and the Proton Synchrotron (PS) is observed in operational conditions for the LHC beams at CERN. The ongoing LHC Injectors Upgrade (LIU) project requires a tight budget for beam degradation along the injector chain and therefore the reason for this emittance discrepancy needs to be understood. Systematic measurements have been performed for various beam characteristics (beam intensity, transverse and longitudinal emittance). In this paper, a comparison between the emittance measurements using all available beam instrumentation with different emittance computation algorithms is presented. The results are compared to measurements at PS injection. Furthermore, the impact on the LIU project requirements for the emittance preservation along the LHC Injectors Complex is discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS087  
About • paper received ※ 14 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
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MOPTS119 APS LINAC Interleaving Operation linac, gun, operation, storage-ring 1161
 
  • Y. Sun, K. Belcher, J.C. Dooling, A. Goel, A.L. Hillman, R.T. Keane, A.F. Pietryla, H. Shang, A. Zholents
    ANL, Argonne, Illinois, 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.
Three s-band RF guns are installed at the front end of the Advanced Photon Source (APS) linac: two thermionic cathode guns (RG2 and RG1), and one Photo-Cathode Gun (PCG). During normal operations, RG2 provides electron beams for the storage ring to generate x-rays for APS users. The PCG generates high brightness electron beams that can be accelerated through the APS linac and transported into the Linac Extension Area (LEA) for advanced accelerator technology and beam physics experiments. The alternating acceleration of the RG2 and PCG beam in the linac is possible, as most of the time, RG2 beam is only needed for ~20 seconds every two minutes. This mode of interleaving operation of RG2 and PCG beams through the APS linac requires some modifications/additions to several systems of the linac, including RF, magnets, controls and Access Control Interlock System etc. In this paper we report our interleaving design and present the commissioning results of the two beam interleaving operation. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS119  
About • paper received ※ 14 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
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TUPMP001 Design and Experimental Results of a 1.1kA/800V AC Power Supply for Sirius Booster Dipoles controls, dipole, power-supply, synchrotron 1227
 
  • C. Rodrigues, G.O. Brunheira, B.E. Limeira, G.M. Rogatto
    LNLS, Campinas, Brazil
  
  Sirius is a 4th generation synchrotron light source de-signed and being built by Brazilian Synchrotron Light Laboratory (LNLS), with first beam scheduled for 2019. Approximately thousand power supplies (PS) will be needed to feed all the magnets, being 57 to operate the booster injector. The two booster dipole PS are the most complex, not only due to their higher current (1.1 kA), voltage (800 V) and power (333 kW) output, but also because the current must follow a quasi-triangular waveform, from a value close to zero to almost the maximum in 320 ms and at a repetition rate of 2 Hz. Due to the high output values, each PS is formed by two sets in parallel of 4 modules in series, what means 8 modules with 550 A / 200 V output. In order to reduce the 2-Hz effect in the grid, each module has two main stages. The input stage has the function to regulate the average voltage in a capacitor bank consuming a constant RMS current from the grid, which value depends on of the PS average output power. The output stage has the function to transfer the energy from the capacitor bank to the load, with the output cur-rent following the reference waveform. This work describes this PS, showing its topology, some aspects of its design and obtained results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP001  
About • paper received ※ 13 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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TUPGW001 Improvements to Injector System Efficiency at the Australian Synchrotron linac, injection, synchrotron, klystron 1378
 
  • M.P. Lafky, M.P. Atkinson, L.N. Hearder
    AS - ANSTO, Clayton, Australia
  • P.J. Giansiracusa
    The University of Melbourne, Melbourne, Victoria, Australia
  
  Funding: Australian Nuclear Science and Technology Organisation
New instrumentation, software, and hardware upgrades have allowed Operations personnel to increase the overall injector system efficiency from 50% to 80% at the Australian Synchrotron. This paper will provide an overview of the methods used to achieve this result. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW001  
About • paper received ※ 15 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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TUPGW003 Sirius Status Update storage-ring, vacuum, alignment, controls 1381
 
  • A.R.D. Rodrigues, F.C. Arroyo, J.F. Citadini, R.H.A. Farias, J.G.R.S. Franco, R. Junqueira Leão, L. Liu, S.R. Marques, R.T. Neuenschwander, C. Rodrigues, F. Rodrigues, R.M. Seraphim, O.H.V. Silva, F.H. de Sá
    LNLS, Campinas, Brazil
  
  Sirius is a 4th generation 3 GeV low emittance electron storage ring that is in its final installation phase at the Brazilian Center for Research in Energy and Materials (CNPEM) campus in Campinas, Brazil. Presently the injector installation is complete, and the storage ring installation is being finalized. Most subsystems are under test and tuning in real working conditions. Six beamlines are also under construction. In this paper we report on the Sirius main subsystems installation status.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW003  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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TUPGW029 The Injection System and the Injector Complex for PETRA IV injection, emittance, kicker, gun 1465
 
  • J.X. Zhang, I.V. Agapov, H. Ehrlichmann, X.N. Gavaldà, M. Hüning, J. Keil, F. Obier, M. Schmitz, R. Wanzenberg
    DESY, Hamburg, Germany
  
  PETRA IV project is to upgrade PETRA III to a synchrotron radiation source with an ultra-low emittance. Due to the small dynamic aperture of the PETRA IV storage ring, a horizontal on-axis injection is prepared. In this paper, the preliminary study of the injection scheme is described. To meet the requirements of the on-axis injection, a plan of a new injector complex, including the Gun, the LINAC and the accumulator is shown in this paper. Several options are discussed in this paper, too.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW029  
About • paper received ※ 14 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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TUPGW046 Progress of Lattice Design and Physics Studies on the High Energy Photon Source lattice, storage-ring, photon, injection 1510
 
  • Y. Jiao, X. Cui, Z. Duan, Y.Y. Guo, P. He, X.Y. Huang, D. Ji, C. Li, J.Y. Li, X.Y. Li, C. Meng, Y.M. Peng, Q. Qin, S.K. Tian, J.Q. Wang, N. Wang, Y. Wei, G. Xu, H.S. Xu, F. Yan, C.H. Yu, Y.L. Zhao
    IHEP, Beijing, People’s Republic of China
  
  The High Energy Photon Source (HEPS) is an ul-tralow-emittance, kilometer-scale storage ring light source to be built in China. In this paper we will introduce the progress of the physics design and related studies of HEPS over the past year, covering issues in storage ring lattice design, injection and injector design, insertion device effects, error study and lattice calibration, collective effects, etc.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW046  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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TUPGW048 Simulation of Injection Efficiency for the High Energy Photon Source injection, storage-ring, kicker, extraction 1514
 
  • Z. Duan, J. Chen, Y.Y. Guo, D. Ji, Y. Jiao, C. Meng, Y.M. Peng, Xu. Xu
    IHEP, Beijing, People’s Republic of China
  
  Funding: Work supported by Natural Science Foundation of China (No.11605212).
A ’high-energy accumulation’ scheme [1] was proposed to deliver the full charge bunches for the swap-out injec- tion of the High Energy Photon Source. In this scheme, the depleted storage ring bunches are recovered via merging with small charge bunches in the booster, before being refilled into the storage ring. In particular, the high charge bunches are transferred twice between the storage ring and the booster, and thus it is essential to maintain a near per- fect transmission efficiency in the whole process. In this paper, major error effects affecting the transmission efficiency are analyzed and their tolerances are summarized, injection simulations indicate a satisfactory transmission efficiency is achievable for the present baseline lattice.
* Z. Duan, et al., "The swap-out injection scheme for the High Energy Photon Source", Proc. IPAC’18, THPMF052 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW048  
About • paper received ※ 15 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
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TUPGW052 STUDY OF THE RAMPING PROCESS FOR HEPS BOOSTER storage-ring, damping, lattice, injection 1521
 
  • Y.M. Peng, J.Y. Li, C. Meng, H.S. Xu
    IHEP, Beijing, People’s Republic of China
  
  The High Energy Photon Source (HEPS) is a 6-GeV, ul-tralow-emittance storage ring light source to be built in Huairou District, Beijing, China. The beam energy ramps from 500 MeV to 6 GeV in 400 ms, during which the RF voltage increases accordingly to keep the momentum acceptance large enough. The booster is designed to operate at 1 Hz repetition frequency. In this paper the energy ramping curve, RF choice, beam parameters changing curves and eddy current effect in HEPS booster will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW052  
About • paper received ※ 14 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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TUPGW091 Lattice Measurements of the APS Injector Rings quadrupole, emittance, lattice, dipole 1619
 
  • V. Sajaev, C. Yao
    ANL, Argonne, Illinois, 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
APS Upgrade will feature an entirely new storage ring but will keep the existing injector complex consisting of the linear accelerator, Particle Accumulator Ring (PAR) and Booster. Due to small dynamic aperture of the APS Upgrade lattice, swap-out injection is adapted when an entire old bunch is replaced with a new bunch. This injection requires Booster to provide high-charge bunches with up to 17 nC in a single bunch. An extensive work is being carried out on characterizing the existing injector rings to ensure future high-charge operation. In this paper, we will present results of the lattice measurement using the response matrix fit. We will show the analysis of the achievable lattice measurement accuracy in the APS Booster and describe fit parameter modifications required to achieve good fit accuracy for the PAR. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW091  
About • paper received ※ 15 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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TUPTS109 Status of AC Dipole Project at Rhic Injectors for Polarized 3He, Update dipole, resonance, vacuum, proton 2177
 
  • K. Hock, C.W. Dawson, H. Huang, J.P. Jamilkowski, F. Méot, P. Oddo, M.C. Paniccia, Y. Tan, N. Tsoupas, J.E. Tuozzolo, K. Zeno
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
An ac dipole will be used for the efficient transport of polarized 3He in the AGS Booster as it is accelerated to |Gγ|=10.5. The ac dipole introduces a coherent vertical beam oscillation which allows preservation of polarization through the two intrinsic resonances Gγ=12-νy and Gγ=6+νy resonances, by full spin flipping. The AGS Booster ac dipole will be tested with protons crossing the Gγ=0+νy intrinsic resonance, which has ac dipole requirements similar to polarized 3He crossing the Gγ=12-νy resonance, providing a convenient proof of principle. This paper gives a status of the project. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS109  
About • paper received ※ 13 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
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TUPTS110 Scanning the AC Dipole Resonance Proximity Parameter in the AGS Booster dipole, resonance, betatron, simulation 2179
 
  • K. Hock, H. Huang, F. Méot, P. Oddo, N. Tsoupas
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
An ac dipole system is installed in the AGS Booster in view of acceleration of polarized helion for RHIC and the eRHIC EIC. The amplitude of the vertical coherent oscillations induced by the ac dipole depends greatly on the resonance proximity parameter, δm, which is the distance between resonance tune and driving tune. Due to the non-zero momentum spread, particles with different momenta will have different value of δm. The rapid acceleration rate of the booster would cause δm to sweep, the amount of which would depend on the energy and the duration of the ac dipole cycle. These effects are simulated using zgoubi, which set a range of δm values suitable for both high spin flip efficiency and minimizing emittance growth, and the results of the simulations are discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS110  
About • paper received ※ 12 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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WEYPLM1 Status of Circular Electron-Positron Collider and Super Proton-Proton Collider collider, injection, luminosity, cavity 2244
 
  • C.H. Yu, S. Bai, X. Cui, J. Gao, H. Geng, D.J. Gong, D. Ji, Y.D. Liu, C. Meng, Q. Qin, J.Y. Tang, D. Wang, N. Wang, Y. Wang, Y. Wei, J.Y. Zhai, Y. Zhang, H.J. Zheng, Y.S. Zhu
    IHEP, Beijing, People’s Republic of China
  
  Circular electron-positron collider (CEPC) is a dedi-cated project proposed by China to research the Higgs boson. The collider ring provides e+ e− collision at two interaction points (IP). The luminosity for the Higgs mode at the beam energy of 120GeV is 3*1034 cm-2s-1 at each IP while the synchrotron radiation (SR) power per beam is 30MW. Furthermore, CEPC is compatible with W and Z experiments, for which the beam energies are 80 GeV and 45.5 GeV respectively. The luminosity at the Z mode is higher than 1.7*1035 cm-2s-1 per IP. Top-up operation is available during the data taking of high energy physics. Super Proton-Proton Collider (SPPC) is envisioned to be an extremely powerful machine, with centre mass energy of 75 TeV, a nominal luminosity of 1.0*1035 cm-2s-1 per IP, and an integrated luminosity of 30 ab-1 assuming 2 interaction points and ten years of running. The status of CEPC and SPPC will be introduced in detail in this paper.  
slides icon Slides WEYPLM1 [11.814 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEYPLM1  
About • paper received ※ 14 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
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WEPMP019 Physical Design of HEPS Low Energy Transport Line linac, injection, dipole, lattice 2349
 
  • Y.M. Peng, C. Meng, H.S. Xu
    IHEP, Beijing, People’s Republic of China
  
  he High Energy Photon Source (HEPS), a kilometre-scale storage ring based light source, with emittance less than 60 pm.rad, will be constructed in Beijing, China. It con-sists of a 500 MeV linac, a 500 MeV low energy transport line, a full energy booster synchrotron, two 6- GeV transport lines, a 6 GeV ultra-low emittance storage ring, and the beam line experimental stations. The low energy transport line connecting the linac and the booster. Based on the construction layout restrictions, the beam enve-lopes of the linac and the booster should be matched, and the beam produced by the linac is high efficiently trans-mitted to the booster injection point. HEPS low energy transport line has three functional sections, the achromat injection matching section, the optics matching section and the output matching section. In order to correct the error effects on the beam, 8 BPM are set in the low energy transport line. There are also 6 horizontal correctors and 6vertical correctors for beam trajectory correction. This paper will show the detailed design of HEPS low energy transport line.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP019  
About • paper received ※ 14 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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WEPMP039 The New Injection Region of the CERN PS Booster injection, linac, proton, emittance 2414
 
  • W.J.M. Weterings, C. Bracco, L.O. Jorat, M. Meddahi, R. Noulibos, P. Van Trappen
    CERN, Geneva, Switzerland
  
  During the Long Shutdown 2 (LS2) at CERN, the new Linac4 (L4) accelerator will be connected to the PS Booster (PSB) to inject 160 MeV H− beam into the 4 superposed PSB rings. In order to achieve this, we have designed, built and pre-assembled a completely new H− charge-exchange injection chicane system, with a carbon stripping foil unit to convert the negative hydrogen ions into protons by stripping off the electrons. In parallel, we have built and installed a test stand in the L4 transfer line enabling us to gain valuable experience with operation of the stripping foil system and to evaluate different foil types during the L4 reliability runs. This paper describes the final design of the new PSB injection region and reports on the important test results obtained with the stripping foil test stand.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP039  
About • paper received ※ 10 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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WEPMP043 Injection Studies for the Proposed Diamond-II Storage Ring injection, kicker, septum, storage-ring 2430
 
  • I.P.S. Martin, R. Bartolini, H. Ghasem, J.P. Kennedy, B. Singh
    DLS, Oxfordshire, United Kingdom
  
  The baseline design for the Diamond-II storage ring consists of a Modified-Hybrid 6-Bend Achromat, combining the ESRF-EBS low-emittance cell design with the DDBA mid-straight concept*,**. This cell design provides sufficient dynamic aperture to permit an off-axis injection scheme, provided the emittance of the injected beam is sufficiently low. In this paper we present simulations of an injection scheme using the anti-septum concept***, along with the design of an upgrade to the existing booster synchrotron. Alternate injection strategies are also discussed.
*ESRF Technical Design Study, ’The Orange Book’, (2014)
**R. Bartolini et al., PRAB 21, 050701, (2018)
***C. Gough, M. Aiba, Proc. IPAC 2017, Copenhagen, Denmark, paper MOPIK104, (2017)
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP043  
About • paper received ※ 15 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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WEPGW106 Statistical Measurement of Longitudinal Beam Halo in Fermilab Recycler experiment, detector, data-acquisition, scattering 2742
 
  • E. Prebys, T.M. Nguyen
    UCD, Davis, California, USA
  • A.S. Dyshkant, D. Hedin
    Northern Illinois University, DeKalb, Illinois, USA
  • A. Gaponenko
    Fermilab, Batavia, Illinois, USA
  • R.J. Hooper
    Lewis University, Romeoville, Illinois, USA
  • M. Jones
    Purdue University, West Lafayette, Indiana, USA
  
  Funding: This work supported by US Department of Energy Contract DE-AC02-07CH11359
The formation of non-Gaussian halo in both the transverse and longitudinal dimensions of beam bunches has been notoriously difficult both the model and to measure. We present a technique to measure the longitudinal halo of 2.5 MHz bunches in the Fermilab Recycler, which have been formed for the g-2 anomalous magnetic moment experiment. While out of time beam is not a particular concern to this experiment, it is a key issue for the subsequent Mu2e rare muon decay experiment, which will use the same bunch formation procedure. Our measurement relies on a statistical technique, in which a small fraction of the beam is scattered from the primary collimation foil in the recycler, and then is detected by a charge telescope consisting of quartz Cherenkov radiators and photomultiplier tubes. By integrating over many revolutions, the time profile of longitudinal halo (out-of-time beam) can be measured down to less than a 10-5 fractional level, relative to in-time beam. These results can then be compared to simulations. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW106  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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WEPGW111 Design of Booster-to-Accumulator Transfer Line for Advanced Light Source Upgrade injection, quadrupole, storage-ring, optics 2756
 
  • C. Sun, Ph. Amstutz, T. Hellert, J.-Y. Jung, S.C. Leemann, J.R. Osborn, M. Placidi, C. Steier, C.A. Swenson, M. Venturini, W. Wan
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the Director Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
For the Advanced Light Source Upgrade, an on-axis swap-out injection is applied to exchange bunch trains between the storage ring and the accumulator ring. To replenish the accumulator ring before the swap-out injection, an electron beam from Linac is first injected into the ALS booster to ramp up the energy, and then transported to the accumulator through the Booster-to-Accumulator (BTA) transfer line. The design of the BTA transfer line is a challenging task as it has to fit within a tight space while accommodating the booster and accumulator rings at different elevations. Moreover, the BTA design needs to meet the optics boundary conditions and ideally minimize the size requirements of vacuum-chamber apertures. In this paper, we will present a design option of the BTA transfer line, which meets both space limitations and beam physics requirements. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW111  
About • paper received ※ 14 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
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WEPRB102 Correction of Crosstalk Effect in the LEReC Booster Cavity cavity, electron, resonance, HOM 3051
 
  • B.P. Xiao, K. Mernick, F. Severino, K.S. Smith, T. Xin, W. Xu
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work is supported by Brookhaven Science Associates, LLC under contract No. DE-AC02-98CH10886 with the US DOE.
The Linac of Low Energy RHIC electron Cooler (LEReC) is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with peak-to-peak dp/p less than 7·10-4. The booster cavity is the major accelerating component in LEReC, which is a 0.4 cell cavity operating at 2 K, with a maximum energy gain of 2.2 MeV. It is modified from the Energy Recovery Linac (ERL) photocathode gun, with fundamental power coupler (FPC), pickup coupler (PU) and higher order mode (HOM) coupler close to each other. The direct coupling between FPC and PU induced crosstalk effect in this cavity. This effect is simulated and measured, and is further corrected using low level RF (LLRF) to meet the energy spread requirement. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB102  
About • paper received ※ 14 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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WEPRB113 Toolbox for Optimization of RF Efficiency for Linacs linac, klystron, RF-structure, software 3074
 
  • J. Ögren, A. Latina, D. Schulte
    CERN, Meyrin, Switzerland
  
  We present a toolbox for optimizing the rf efficiency for linacs and as an example we use it to re-optimize the Compact Linear Collider booster linac. We have implemented a numerical model of a SLED-type pulse compressor that can generate a single or a double pulse. Together with the CERN CLICopti library, an RF structure parameter estimator, we created the toolbox which enables thorough optimizations of linacs in terms of RF efficiency, beam stability, and cost simultaneously, via a simple and concise Octave script. This toolbox was created for the optimization of X-band-based linacs, however it can also be used at lower frequencies, e.g. in the S- and in the C- bands of frequencies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB113  
About • paper received ※ 06 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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WEPTS105 Simulation of Sirius Booster Commissioning MMI, injection, simulation, closed-orbit 3366
 
  • M.B. Alves, L. Liu, F.H. de Sá
    LNLS, Campinas, Brazil
  
  Sirius is the new 3 GeV fourth-generation low emittance light source under construction at the Brazilian Synchrotron Light Laboratory. In order to study strategies forthe commissioning, different scenarios were studied by tracking simulations on lattice models with realistic alignment and magnet excitation errors, taking into account the finite precision of the beam diagnostic devices. We developed a commissioning algorithm that provides an efficient adjustment of the on-axis injection parameters, trajectory and closed orbit corrections and tuning of the RF parameters. With this algorithm it was possible to obtain a stable beam for thousands of turns in all the random machines simulated. The algorithms allows for partially automated commissioning procedures.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS105  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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THYYPLM3 High-Charge Injector for on-Axis Injection Into A High-Performance Storage Ring Light Source injection, synchrotron, storage-ring, emittance 3423
 
  • K.C. Harkay, I.A. Abid, T.G. Berenc, W. Berg, M. Borland, A.R. Brill, D.J. Bromberek, J.M. Byrd, J.R. Calvey, J. Carvelli, J.C. Dooling, L. Emery, T. Fors, G.I. Fystro, A. Goel, D. Hui, R.T. Keane, R. Laird, F. Lenkszus, R.R. Lindberg, T.J. Madden, B.J. Micklich, L.H. Morrison, S.J. Pasky, V. Sajaev, N. Sereno, H. Shang, T.L. Smith, J.B. Stevens, Y. Sun, G.J. Waldschmidt, J. Wang, U. Wienands, K.P. Wootton, A. Xiao, B.X. Yang, Y. Yang, C. Yao
    ANL, Argonne, Illinois, USA
  • A. Blednykh
    BNL, Upton, Long Island, New York, USA
  • A.H. Lumpkin
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Next-generation, high-performance storage ring light sources based on multibend achromat optics will require on-axis injection because of the extremely small dynamic aperture. Injectors will need to supply full-current bunch replacement in the ring with high single-bunch charge for swap-out. For upgrades of existing light sources, such as the Advanced Photon Source Upgrade (APS-U), it is economical to retain the existing injector infrastructure and make appropriate improvements. The challenges to these improvements include achieving high single-bunch charge in the presence of instabilities, beam loading, charge stability and reliability. In this paper, we discuss the rationale for the injector upgrades chosen for APS-U, as well as backup and potential alternate schemes. To date, we have achieved single-bunch charge from the injectors that doubles the original design value, and have a goal to achieve about three times the original design value. 		 
slides icon Slides THYYPLM3 [1.499 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THYYPLM3  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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THPRB066 Beam Based Measurements of Relative RF Phase cavity, alignment, acceleration, proton 3950
 
  • S.C.P. Albright
    CERN, Geneva, Switzerland
  • M.D. Kuczynski
    LPCT, Vandoeuvre-lès-Nancy Cedex, France
  
  The ferrite loaded RF cavities of the CERN Proton Synchrotron Booster will be replaced with FinemetTM loaded cavities during Long Shutdown 2 2019-2020). To fully realise the potential of the new cavities, the relative RF phases must be aligned along the acceleration ramp, where the revolution frequency changes by nearly a factor of 2. A beam based method of measuring the relative phase between the cavities is desired to give the best possible compensation for the frequency dependent phase shift. In this paper we present an operationally viable method to measure the phase shift as a function of RF frequency. The relative phase of the RF cavities can be aligned to within a few degrees, giving an error on the voltage seen by the beam of less than 1%.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB066  
About • paper received ※ 08 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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THPTS002 Sirius Pre-alignment Results alignment, storage-ring, network, laser 4106
 
  • R. Junqueira Leão, H. Geraissate Paranhos de Oliveira, F. Rodrigues, G.R. Rovigatti de Oliveira, U.R. Sposito
    LNLS, Campinas, Brazil
  
  Sirius is a 4th generation synchrotron light source under final installation and beginning of commissioning phase in Brazil, with a bare emittance of 250 picometer rad. In order to fulfil stability requirements (magnets displacement caused by vibration of 6 nm) imposed to achieve expected performance, the mechanical assembly of supporting structures and magnets were designed without adjustment mechanisms. Yet, the misalignment errors of the magnets are the dominating source of dynamical aperture reduction, leading to a maximum permissible deviation of 40 micrometers between adjacent magnets. To this end, dimensional engineering was applied to conceive an alignment concept for magnets on a same girder based solely on the geometric characteristics of the parts. For the large volume positioning of girders in the storage ring tunnel, the applied methodology followed a strategy optimized to reduce measurement uncertainty, as described in the literature. This paper will present the complete measurement process that led to the alignment of Sirius, from the deployment and survey of reference networks to the final alignment of the machine. To express a consistent and unequivocal alignment result and assess the alignment quality considering the measurement uncertainty, an innovative metric described previously was employed. This work will show that the positioning of supports satisfies the requirement of 80 micrometer between girders. Also, the devices and mechanisms used for assembling will be detailed. Inspection of full girder set performed on a Coordinate measuring machine shows a maximum deviation of 30 micrometers for any pair of magnets on a common support.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS002  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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THPTS006 Upgrade of the Canadian Light Source Booster RF System to Solid State controls, operation, klystron, cavity 4112
 
  • J.M. Patel, D. Bertwistle, J. Stampe
    CLS, Saskatoon, Saskatchewan, Canada
  • A. Bachtior, A. Borisov, N. Pupeter
    CRE, Wuppertal, Germany
  • P. Hartmann
    DELTA, Dortmund, Germany
  
  Funding: CFI, NSERC, NRC, CIHR, the Province of Saskatchewan, WD, and the University of Saskatchewan
The Canadian Light Source synchrotron (CLS) had first light in 2004. For the last 14 years of operation we have exclusively used klystrons to provide RF power to our linac, booster, and storage ring. The klystrons represent a single point of failure for the operation of our booster and storage ring. This is especially poignant in the case of our booster ring klystron which is no longer manufactured. We have chosen to move to solid state amplifier (SSA) RF technology for its implicit high redundancy, modularity, ease of maintenance, and efficiency. Herein we review the performance parameters of our upgraded booster RF to a 100 kW 500 MHz transmitter built by Cryoelectra. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS006  
About • paper received ※ 08 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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THPTS018 ILSF Booster Magnets for the New Low Emittance Lattice sextupole, dipole, quadrupole, multipole 4145
 
  • F. Saeidi, S. Dastan, S. Fatehi, J. Rahighi, M. Razazian
    ILSF, Tehran, Iran
  
  Iranian light source facility is a new 3rd generation light source with a booster which is supposed to work at 150 keV injection energy and guide the electrons to a 3GeV ring. It consists of 50 combined dipole magnets in one type, 50 quadrupoles and 15 sextupoles in one family. Using POISSON and OPERA3D codes[1,2], pole and yoke geometry was designed for each magnet and also cooling and electrical calculations have been done. ILSF has attempted to mechanical design and build prototype magnets which are ongoing at this stage too.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS018  
About • paper received ※ 30 April 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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THPTS040 Preliminary Design of Mechanical Supports for the Booster of Heps dipole, quadrupole, alignment, sextupole 4197
 
  • H. Wang, C.H. Li, C. Meng, H. Qu
    IHEP, Beijing, People’s Republic of China
  
  The Booster of High Energy Photon Source (HEPS) is a 454 meters ring with the repeat frequency of 1 Hz. The natural frequency of the magnets and their support as-sembly should be higher than 30 Hz. The alignment re-quirements on quadrupole and sextupole are better than 0.1 mm in x and y direction. This paper will discuss the preliminary design of the mechanical supports in Booster ring, as well as the discussion of finite element analyses results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS040  
About • paper received ※ 30 April 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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THPTS058 New 50 KW SSPA Transmitter for the ALBA Booster operation, ISOL, synchrotron, cavity 4237
 
  • P. Solans, B. Bravo, J.R. Ocampo, F. Pérez, A. Salom
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • J.V. Balboa, I. Fernández, D. Iriarte, J. Lluch, A. Mellado, C. Rosa, F. Sierra, E. Ugarte
    BTESA, Leganés, Spain
  
  ALBA is a 3th generation 3 GeV synchrotron light source located in Barcelona and operating with users since May 2012. The IOT based transmitter for the booster cavity has been replaced by a Solid State Power Amplifier (SSPA) of 50 kW at 500 MHz in August 2018. The new transmitter is made of 96 active devices, which are divided in 12 modules of 8 transistors each one. The modules are combined in groups of four using the Gysel topology and two hybrid combiners are used for the final combining stage. The design allows the transmitter to provide enough power even when multiple transistor fails occur, in the same module or in different ones, and it also presents power supplies redundancy. These modules can be hot swapped, i.e., the module can be replaced by a spare at any time, even when the transmitter is providing power without affecting the operation. After two months of operation, the transmitter fulfills very well the design specifications regarding power, efficiency and gain; and although minor problems have arisen due to infant mortality in some components, the operation of the transmitter has never been affected due to the high redundancy.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS058  
About • paper received ※ 15 May 2019       paper accepted ※ 18 May 2019       issue date ※ 21 June 2019  
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THPTS060 Sirius Digital LLRF LLRF, cavity, controls, FPGA 4244
 
  • A. Salom, F. Pérez
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • R.H.A. Farias, F.K.G. Hoshino, A.P.B. Lima
    LNLS, Campinas, Brazil
  
  Sirius is a Synchrotron Light Source Facility based on a 4th generation low emittance storage ring. The facility is presently under construction in Campinas, Brazil, and comprises a 3 GeV electron storage ring, a full energy booster synchrotron and a 120 MeV linac. The booster RF system is based on a single 5-cell cavity driven by a 50 kW amplifier at 500MHz and is designed to operate at 2 Hz rate. The storage ring RF system will start with 1 normal conducting 7-cell cavity. In the final configuration, the system will comprise 2 superconducting cavities, each one driven by a 240 kW RF amplifier. A digital LLRF system based on ALBA LLRF has been designed and commissioned to control 3 different types of cavities: 2 normal conducting single cell cavities, one multi-cell cavity driven by 2 amplifiers and one superconducting cavity driven by 4 amplifiers. The first LLRF System was installed and commissioned in the Sirius Booster in 2019. The performance of the control loops with beam, together with other utilities of the system like automatic start-up, conditioning, fast interlocks and post-mortem analysis will be presented in this paper, as well as possible upgrades for the future  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS060  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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