Author: Adhikari, G.D.
Paper Title Page
WEPAB257 Matching of a Space-Charge Dominated Beam into the Undulator of the THz SASE FEL at PITZ 3244
 
  • X. Li, Z. Aboulbanine, G.D. Adhikari, N. Aftab, Z.G. Amirkhanyan, P. Boonpornprasert, M.E. Castro Carballo, N. Chaisueb, G.Z. Georgiev, J. Good, M. Groß, C. Koschitzki, M. Krasilnikov, O. Lishilin, A. Lueangaramwong, D. Melkumyan, R. Niemczyk, A. Oppelt, H.J. Qian, G. Shu, F. Stephan, G. Vashchenko, T. Weilbach
    DESY Zeuthen, Zeuthen, Germany
 
  The Photo In­jec­tor Test fa­cil­ity at DESY in Zeuthen (PITZ) is de­vel­op­ing a THz SASE FEL as a pro­to­type high rep­e­ti­tion rate ac­cel­er­a­tor-based source for the THz-pumped, X-ray-probed ex­per­i­ments at the Eu­ro­pean XFEL. For the gen­er­a­tion of THz pulses of mJ-level en­ergy from SASE, an elec­tron beam with a high charge (up to 4 nC) and high peak cur­rent (~200 A) will be in­jected into an LCLS-I un­du­la­tor, which is cur­rently being in­stalled at the end of the photo-in­jec­tor. The nar­row vac­uum cham­ber (11x5 mm) be­tween the mag­netic poles and the strong ver­ti­cal fo­cus­ing from the un­du­la­tor, as well as the lack of beam di­ag­nos­tics, have made it a chal­lenge to match the space-charge dom­i­nated beam into the un­du­la­tor with­out beam loss dur­ing the fol­low­ing trans­port. In this paper, bound­ary con­di­tions of a matched elec­tron beam will be dis­cussed and the sim­u­la­tion and ex­per­i­men­tal study on our match­ing strat­egy will be pre­sented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB257  
About • paper received ※ 08 May 2021       paper accepted ※ 02 July 2021       issue date ※ 13 August 2021  
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WEPAB274 Numerical Study of Beam Dynamics in PITZ Bunch Compressor 3285
 
  • A. Lueangaramwong, Z. Aboulbanine, G.D. Adhikari, N. Aftab, P. Boonpornprasert, N. Chaisueb, G.Z. Georgiev, J. Good, M. Groß, C. Koschitzki, M. Krasilnikov, X. Li, O. Lishilin, D. Melkumyan, H.J. Qian, G. Shu, F. Stephan, G. Vashchenko, T. Weilbach
    DESY Zeuthen, Zeuthen, Germany
  • H. Shaker
    CLS, Saskatoon, Saskatchewan, Canada
 
  A mag­netic bunch com­pres­sor has been re­cently de­signed for an ac­cel­er­a­tor-based THz source which is under de­vel­op­ment at the Photo In­jec­tor Test fa­cil­ity at DESY in Zeuthen (PITZ). The THz source is as­sumed to be a pro­to­type for an ac­cel­er­a­tor-based THz source for pump-probe ex­per­i­ments at the Eu­ro­pean XFEL. As an elec­tron bunch is com­pressed to achieve higher bunch cur­rents for the THz source, we in­ves­ti­gate the beam dy­nam­ics in the bunch com­pres­sor by nu­mer­i­cal sim­u­la­tions. A start-to-end sim­u­la­tion op­ti­mizer has been de­vel­oped by com­bin­ing the use of ASTRA, IM­PACT-T, and OCELOT to sup­port the de­sign of the THz source pro­to­type. Co­her­ent syn­chro­tron ra­di­a­tion ef­fects de­grade the com­pres­sion per­for­mance for our study cases with bunch charges up to 4 nC and beam en­ergy of 17 MeV at a bend­ing angle of 19 de­grees. Sim­u­la­tion and pre­lim­i­nary beam char­ac­ter­is­tic re­sults will be pre­sented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB274  
About • paper received ※ 11 May 2021       paper accepted ※ 06 July 2021       issue date ※ 23 August 2021  
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