Keyword: extraction
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MOP2WB02 Simulation and Measurement Campaigns for Characterization and Performance Improvement of the CERN Heavy Ion Linac3 linac, simulation, rfq, emittance 64
 
  • G. Bellodi, S. Benedetti, D. Küchler, F.J.C. Wenander
    CERN, Geneva, Switzerland
  • V. Toivanen
    GANIL, Caen, France
 
  In the framework of the LHC Injector Upgrade programme (LIU), several activities have been carried out to improve the GTS-LHC ion source and Linac3 performance (Linac3 providing the charged heavy ion beams for CERN exper-iments). A restudy of the beam dynamics and transport through the linac was initiated, through a campaign of systematic machine measurements and parallel beam simulations, generalising techniques developed for beam characterization during Linac4 commissioning. The work here presented will review the most relevant findings and lessons learnt in the process.  
slides icon Slides MOP2WB02 [17.512 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WB02  
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TUA1WD04 High Intensity Proton Stacking at Fermilab: 700 kW Running proton, injection, controls, survey 136
 
  • R. Ainsworth, P. Adamson, B.C. Brown, D. Capista, K.J. Hazelwood, I. Kourbanis, D.K. Morris, M. Xiao, M.-J. Yang
    Fermilab, Batavia, Illinois, USA
 
  As part of the Nova upgrades in 2012, the Recycler was repurposed as proton stacker for the Main Injector with the aim to deliver 700 kW. Since January 2017, this design power has been run routinely. The steps taken to commission the Recycler and run at 700 kW operationally will be discussed as well as plans for future running.  
slides icon Slides TUA1WD04 [62.832 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA1WD04  
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TUP2WA04 Dynamic Vacuum Simulation for the BRing vacuum, simulation, synchrotron, injection 186
 
  • P. Li, Z. Dong, M. Li, J.C. Yang
    IMP/CAS, Lanzhou, People's Republic of China
  • L.H.J. Bozyk
    GSI, Darmstadt, Germany
 
  Funding: Youth Innovation Promotion Association of Chinese Academy of Sciences 2016364, National Natural Science Foundation of China (Project No. 11675235).
Large dynamic vacuum pressure rises of orders of magnitude which caused by the lost heavy ions can seriously limit the ion intensity and beam lifetime of the heavy ion accelerator, especially for the machine that operate the intermediate charge state heavy ion. The High Intensity heavy ion Accelerator Facility (HIAF) which will be built by the IMP will accumulate the intermediate charge state ion 238U35+ to intensity 2*1011 ppp to different terminals. In order to control the dynamic vacuum effects induced by the lose beams and design the collimation system for the BRing of the HIAF, a newly developed simulation program (ColBeam) and GSI's simulation code StrahlSim are both conducted and the dynamic vacuum simulation result is calculated by the StrahlSim. According to the simulation result, 3*1011 ppp particles is the up limit beam intensity can be extracted for the current BRing vacuum system design. Higher beam intensity can be reach to 5*1011 ppp when the NEG coating technology must be implemented for the dipole and quadrupole chamber.
HIAF, Collimation, Dynamic vacuum
 
slides icon Slides TUP2WA04 [9.947 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WA04  
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TUP2WA05 Effect of the Extraction Kickers on the Beam Stability in the CERN SPS impedance, kicker, simulation, cavity 189
 
  • A. Farricker, M.S. Beck, J. Repond, C. Vollinger
    CERN, Geneva, Switzerland
 
  Longitudinal beam instability in the CERN SPS is a major limitation in the ability to achieve the bunch intensities required for the goals of the High-Luminosity LHC project (HL-LHC). One of the major drivers in limiting the intensity of the machine is the broadband contribution to the beam-coupling impedance due to the kicker magnets. The extraction kickers (MKE) discussed in this paper are known to give a significant contribution to the overall longitudinal beam-coupling impedance. We present the results of bench measurements of the MKE's impedance to determine the accuracy of electromagnetic simulation models from which the impedance modelused for beam dynamics simulationsis constructed. In addition, we discuss the feasibility and implementation of beam measurements that can indicate the contribution of the MKE magnets to the longitudinal beam-coupling impedance of the SPS.  
slides icon Slides TUP2WA05 [2.698 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WA05  
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WEA1WA02 Approaching the High-Intensity Frontier Using the Multi-Turn Extraction at the CERN Proton Synchrotron emittance, proton, operation, synchrotron 231
 
  • A. Huschauer, H. Bartosik, S. Cettour-Cave, M. R. Coly, D.G. Cotte, H. Damerau, G.P. Di Giovanni, S.S. Gilardoni, M. Giovannozzi, V. Kain, E. Koukovini-Platia, B. Mikulec, G. Sterbini, F. Tecker
    CERN, Geneva, Switzerland
 
  Complementary to the physics research at the LHC, several fixed target facilities receive beams from the LHC injector complex. In the scope of the fixed target physics program at the Super Proton Synchrotron, high-intensity proton beams from the Proton Synchrotron are extracted using the Multi-Turn Extraction scheme, which is based on particle trapping in stable islands of the horizontal phase space. Considering the number of protons requested by future experimental fixed target facilities, such as the Search for Hidden Particles experiment, the currently operationally delivered beam intensities are insufficient. Therefore, experimental studies have been conducted to optimize the Multi-Turn Extraction technique and to exploit the possible intensity reach. The results of these studies along with the operational performance of high-intensity beams during the 2017 run are presented in this paper. Furthermore, the impact of the hardware changes pursued in the framework of the LHC Injectors Upgrade project on the high-intensity beam properties is briefly mentioned.  
slides icon Slides WEA1WA02 [25.566 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA1WA02  
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WEP2PO017 Study on the Leakage Fields of the Septum and Lambertson Magnets during the Beam Commissioning septum, injection, MMI, neutron 303
 
  • M.Y. Huang, S. Wang, S.Y. Xu
    IHEP, Beijing, People's Republic of China
 
  For China Spallation Neutron Source (CSNS), the septum magnets are the key part of the injection system and the lambertson magnet is the key part of the extraction system. If the leakage fields of the septum and lambertson magnets are large enough, the circular beam orbit of Rapid Cycling Synchrotron (RCS) would be affected. In this paper, during the beam commissioning, the leakage fields of the septum and lambertson magnets will be studied and their effects on the circular beam orbit will be given and discussed.  
poster icon Poster WEP2PO017 [0.852 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO017  
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WEP2PO023 Timing Adjustment of Eight Kickers and a Method to Calibrate the Kicker Current Curves During the Beam Commissioning for CSNS kicker, timing, MMI, controls 312
 
  • M.Y. Huang, D.P. Jin, L. Shen, S. Wang, S.Y. Xu, P. Zhu
    IHEP, Beijing, People's Republic of China
 
  The extraction system is a key part of the China Spallation Neutron Source (CSNS) accelerator. It consists of two kinds of magnets: eight kickers and one lambertson. During the beam commissioning, the timing adjustment of eight kickers is a very important problem. In the paper, the methods to adjust the timing of eight kickers will be studied and applied to the beam commissioning. Then, the best method to adjust the timing of eight kickers will be given and used for a long time in the future.  
poster icon Poster WEP2PO023 [1.027 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO023  
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WEP2PO028 Conceptual Design of FLNR JINR Radiation Facility Based on DC130 Cyclotron cyclotron, radiation, vacuum, experiment 324
 
  • N.Yu. Kazarinov, P.Yu. Apel, V. Bashevoy, V. Bekhterev, S.L. Bogomolov, O.N. Borisov, J. Franko, G.G. Gulbekyan, I.A. Ivanenko, I.V. Kalagin, V.I. Mironov, S.V. Mitrofanov, V.A. Semin, V.A. Skuratov, A. Tikhomirov
    JINR, Dubna, Moscow Region, Russia
 
  Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research begins the works under the conceptual design of radiation facility based on the DC130 cyclotron. The facility is intended for SEE testing of microchips, for production of track membranes and for solving of applied physics problems. The DC130 cyclotron will accelerate heavy ions with mass-to-charge ratio A/Z of the range from 5 to 8 up to fixed energies 2 and 4.5 MeV per unit mass. The intensity of the accelerated ions will be about 1 pmcA for lighter ions (A<50) and about 0.1 pmcA for heavier ions (A>50). The injection into cyclotron will be realized from the external DECRIS-SC superconducting ECR ion source. The main magnet and acceleration system of DC130 is based on the U200 cyclotron ones that now is under reconstruction. The conceptual design parameters of various systems of the cyclotron and the set of experimental beam lines are presented in this report.  
poster icon Poster WEP2PO028 [1.955 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO028  
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THA1WD03 Status and Beam Power Ramp-Up Plans of the Slow Extraction Operation at J-Parc Main Ring operation, septum, proton, quadrupole 347
 
  • M. Tomizawa, Y. Arakaki, T. Kimura, S. Murasugi, R. Muto, K. Okamura, Y. Shirakabe, E. Yanaoka
    KEK, Ibaraki, Japan
 
  A 30 GeV proton beam accelerated in the J-PARC Main Ring (MR) is slowly extracted by the third integer resonant extraction and delivered to the hadron experimental hall. Slow extraction from the MR has unique characteristics that can be used to obtain a low beam loss rate. Devices with electrostatic septum (ESSs) and magnetic septa are placed in the long straight section with zero dispersion. The separatrix for the resonance is independent of the momentum at the septa when the horizontal chromaticity is set to zero. The resulting beam has a large step size and small angular spread, enabling a low hit rate of the beam at the first ESS. Under these conditions, a dynamic bump scheme has been applied to reduce the beam loss further. We have attained 50 kW operation at 5.2s cycle in the latest physics run. A suppression of instability during debunch process is also essential as well as low beam loss tunings. In this paper, a current status and future plans toward a higher beam power for the slow extraction are reported. Preliminary results for a 8 GeV slow extraction test for the muon to electron conversion search experiment (COMET) will be also briefly presented.  
slides icon Slides THA1WD03 [9.174 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-THA1WD03  
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THP2WC03 The Choosing of Magnetic Structure of Isochronous Cyclotron DC-130 for Applied Research cyclotron, operation, acceleration, heavy-ion 446
 
  • I.A. Ivanenko, J. Franko, G.G. Gulbekyan, I.V. Kalagin, N.Yu. Kazarinov
    JINR, Dubna, Moscow Region, Russia
 
  At the present time, the activities on creation of the new multipurpose isochronous cyclotron DC130 are carried out at the FLNR, JINR. The cyclotron DC130 is intended for microchip testing, production of track pore membranes and for applied physics. The cyclotron will accelerate the heavy ions with mass-to-charge ratio A/Z from 5 to 8 up to the fixed energies 2 and 4.5 MeV per nucleon. The main magnet and acceleration system of DC130 is based on the U200 cyclotron that now is under reconstruction. At the present paper the method of choosing of main magnet parameters of cyclotron is described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-THP2WC03  
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