Keyword: emittance
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MOP033 The Beam Dynamics Updates of the Fermilab PIP-II 800 MeV Superconducting Linac linac, SRF, cavity, optics 123
 
  • A. Saini, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • E. Pozdeyev
    FRIB, East Lansing, Michigan, USA
 
  The Proton Improvement Plan (PIP) -II is a high intensity proton facility being developed to support a neutrino program over the next two decades at Fermilab. At its core is the design and construction of a Continuous Wave compatible superconducting radio frequency linear accelerator that would accelerate an average beam current of 2 mA up to 800 MeV. This paper presents recent updates in the beam dynamics leading to a reliable and robust linac design and simplifying the cryo-module assembly.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-MOP033  
About • paper received ※ 23 June 2019       paper accepted ※ 01 July 2019       issue date ※ 14 August 2019  
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THP063 Inivestigation of the Possibility of High Efficiency L-Band SRF Cavity for Medium-Beta Heavy Ion Multi-Charge-State Beams cavity, linac, cryomodule, heavy-ion 1035
 
  • S.M. Shanab, K. Saito, Y. Yamazaki
    FRIB, East Lansing, Michigan, USA
 
  Funding: This work was supported in part by the U.S. National Science Foundation, under Grant PHY-1102511 and by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
The possibility of L-band SRF elliptical cavity in order to accelerate heavy ion multi-charge-state beams is being investigated for accelerating energy higher than 200 MeV/u. A first simple analytic study was performed and the result showed that the longitudinal acceptance of 1288 MHz is sufficient for heavy-ion multi-charge-state (5 charge states) medium-beta linac. Encouraged this result, detail beam dynamic simulation took place. The cryogenic heat load is also calculated for this linac with taken into consideration cavity doping technology. In this paper, a summary of the beam dynamics and cryogen-ic heat load calculations for 1288 MHz linac for heavy-ion multi-charge-state (5 charge states) medium-beta beams.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-THP063  
About • paper received ※ 24 June 2019       paper accepted ※ 14 August 2019       issue date ※ 14 August 2019  
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THP081 A Cryocooled Normal Conducting and Superconducting Hybrid CW RF Gun cavity, gun, cathode, acceleration 1091
 
  • H.J. Qian, G. Shu, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • S. Barbanotti, B. Petersen, E. Vogel
    DESY, Hamburg, Germany
  • A.A. Gorchakov, M. Gusarova
    MEPhI, Moscow, Russia
 
  Continuous wave (CW) photoinjectors have seen great progress in the last decades, such as DC gun, superconducting RF (SRF) gun and normal conducting (NC) gun. Developments of Free electron lasers and electron microscopy in the CW mode are pushing for further improvements of CW guns towards higher acceleration gradient, higher beam energy and compatibility with high QE cathodes for better beam brightness. Current SC gun gradient is limited by the cathode cell due to the complication of a cathode back plane and a normal conducting cathode plug, and R&D on SC gun improvement is ongoing. A high gradient cryocooled CW NC gun was proposed to house the high QE cathode, and a SC cavity immediately nearby gives further energy acceleration. In this paper, further RF optimization of the NC gun and ASTRA simulations of such a hybrid photoinjector are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-THP081  
About • paper received ※ 25 June 2019       paper accepted ※ 03 July 2019       issue date ※ 14 August 2019  
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THP082 Geometry Dependent Beam Dynamics of a 3.5-cell SRF Gun Cavity at ELBE SRF, cavity, gun, electron 1095
 
  • K. Zhou
    CAEP/IAE, Mianyang, Sichuan, People’s Republic of China
  • A. Arnold, S. Ma, J. Schaber, J. Teichert, R. Xiang
    HZDR, Dresden, Germany
 
  In order to optimize the next generation SRF gun at HZDR ELBE radiation source, the impact on beam dynamics from the SRF cavity geometry needs to be investigated. This paper presents an analysis on the electromagnetic fields and output electron beam qualities, by changing the geometry parameters of a 3.5-cell SRF gun cavity. The simulation results show the higher electric field ratio in the first half cell to the TESLA like cell, the better beam parameters we can obtain, which, however, will also lead to a higher Emax/E0 and Bmax/E0.  
poster icon Poster THP082 [1.935 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-THP082  
About • paper received ※ 22 June 2019       paper accepted ※ 01 July 2019       issue date ※ 14 August 2019  
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THP083 Quadrupole Scan Transverse Emittance Measurements at HZDR ELBE quadrupole, focusing, experiment, electron 1100
 
  • S. Ma, A. Arnold, A.A. Ryzhov, J. Schaber, J. Teichert, R. Xiang, K. Zhou
    HZDR, Dresden, Germany
 
  Two quadrupoles and one screen are used for beam transverse emittance measurements at HZDR ELBE. In this paper, the emittance calculated with two different methods, one with thin-lens approximation and the other one without this approximation, are compared and analized. To analyze the measurement error, quadrupole calibration is need. Two aspects about quadrupole analysis are made. The first one is quadrupole’s effective length and strength and the second one is quadrupole’s converged or diverged ability in reality.  
poster icon Poster THP083 [1.726 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-THP083  
About • paper received ※ 25 June 2019       paper accepted ※ 03 July 2019       issue date ※ 14 August 2019  
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THP103 Reconstruction of the Longitudinal Phase Space for the Superconducting CW HELIAC heavy-ion, cavity, linac, proton 1173
 
  • S. Lauber, K. Aulenbacher, W.A. Barth, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, J. List, M. Miski-Oglu
    HIM, Mainz, Germany
  • K. Aulenbacher, W.A. Barth, C. Burandt, F.D. Dziuba, P. Forck, V. Gettmann, M. Heilmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, T. Sieber, S. Yaramyshev
    GSI, Darmstadt, Germany
  • K. Aulenbacher, F.D. Dziuba, S. Lauber
    IKP, Mainz, Germany
  • H. Podlech, M. Schwarz
    IAP, Frankfurt am Main, Germany
 
  The superconducting (SC) heavy ion HElmholtz LInear ACcelerator (HELIAC) is under development at GSI in Darmstadt in cooperation with Helmholtz Institute Mainz (HIM) and Goethe-University Frankfurt (GUF). A novel design is used for the accelerating cavities, namely SC continuous wave (CW) multigap Crossbar H-Mode cavities. For this a dedicated beam dynamics layout - the EQUidistant mUltigap Structure (EQUUS) - has been carried out a couple of years ago and is under further development. In December 2018 the GSI High Charge State Injector (HLI) delivered heavy ion beam to the already commissioned first of series superconducting RF cavity. Proper 6D-matching to the CH cavity demands sufficient beam characterisation. Slit-grid emittance measurements provided for the transverse phase space determination. By measuring the longitudinal projection of the bunch with a Feschenko Monitor (Beam Shape Monitor), the bunch profile was obtained. With a dedicated algorithm, the full longitudinal phase space at the HLI-exit could be reconstructed from a set of BSM measurements. The basic reconstruction method, all relevant BSM measurements and the resulting phase space reconstruction will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-THP103  
About • paper received ※ 19 June 2019       paper accepted ※ 29 June 2019       issue date ※ 14 August 2019  
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