Author: Mueller, F.
Paper Title Page
TUPAB071 Beam Line Design and Instrumentation for THz@PITZ - the Proof-of-Principle Experiment on a THz SASE FEL at the PITZ Facility 1528
 
  • T. Weilbach, P. Boonpornprasert, G.Z. Georgiev, G. Koss, M. Krasilnikov, X. Li, A. Lueangaramwong, F. Mueller, A. Oppelt, S. Philipp, F. Stephan, L.V. Vu
    DESY Zeuthen, Zeuthen, Germany
  • H. Shaker
    CLS, Saskatoon, Saskatchewan, Canada
  
  In order to allow THz pump-X-ray probe ex­per­i­ments at full bunch rep­e­ti­tion rate for users at the Eu­ro­pean XFEL, the Photo In­jec­tor Test Fa­cil­ity at DESY in Zeuthen (PITZ) is build­ing a pro­to­type of an ac­cel­er­a­tor-based THz source. The goal is to gen­er­ate THz SASE FEL ra­di­a­tion with a mJ en­ergy level per bunch using an LCLS-I un­du­la­tor dri­ven by the elec­tron beam from PITZ. There­fore, the ex­ist­ing PITZ beam line is ex­tended into a tun­nel annex down­stream of the ex­ist­ing ac­cel­er­a­tor tun­nel. The beam line ex­ten­sion in the PITZ tun­nel con­sists of three quadru­pole mag­nets, a bunch com­pres­sor, a col­li­ma­tion sys­tem and a beam dump. In the sec­ond tun­nel a di­pole mag­net al­lows to serve two beam lines, one of them the THz@​PITZ beam line. It con­sists of one LCLS-I un­du­la­tor for the pro­duc­tion of the THz ra­di­a­tion, a quadru­pole triplet in front of it and a quadru­pole dou­blet be­hind it. For the elec­tron beam di­ag­nos­tic six new screen sta­tions are built, three of them also allow for the ob­ser­va­tion of the THz ra­di­a­tion for mea­sure­ments. In ad­di­tion six BPMs and a new BLM sys­tem for ma­chine pro­tec­tion and FEL gain curve mea­sure­ment will be in­stalled. The progress of this work will be pre­sented.  
poster icon Poster TUPAB071 [1.978 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB071  
About • paper received ※ 18 May 2021       paper accepted ※ 14 June 2021       issue date ※ 13 August 2021  
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THPAB049 Modeling the Magnetic Field of the LCLS-I Undulator for THz@PITZ 3855
 
  • M. Krasilnikov, X. Li, A. Lueangaramwong, F. Mueller, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • A. Brachmann, H.-D. Nuhn
    SLAC, Menlo Park, California, USA
  • M. Tischer, P. Vagin
    DESY, Hamburg, Germany
  
  Funding: This work was supported by the European XFEL research and development program
An ac­cel­er­a­tor-based THz source for pump-probe ex­per­i­ments at the Eu­ro­pean XFEL is under de­vel­op­ment at the Photo In­jec­tor Test Fa­cil­ity at DESY in Zeuthen (PITZ). For the proof-of-prin­ci­ple ex­per­i­ments an LCLS-I un­du­la­tor is planned to be in­stalled down­stream of the PITZ ac­cel­er­a­tor. The fields of the un­du­la­tor mod­ule 26 have been re-mea­sured at DESY in Ham­burg and the re­sults are con­sis­tent with ear­lier SLAC mea­sure­ments. A model for 3D field re­con­struc­tion based on the un­du­la­tor mag­netic mea­sure­ments has been de­vel­oped. It in­cludes also a hor­i­zon­tal gra­di­ent of the ver­ti­cal field. Track­ing of the 17 MeV/c beam has re­vealed that the trans­verse gra­di­ent will lead to a sig­nif­i­cant off-axis tra­jec­tory in the hor­i­zon­tal plane. This off­set has to be cor­rected with a steer­ing coil, the de­sign of which is also pre­sented. The per­for­mance of the THz gen­er­a­tion with the cor­rec­tion coil is dis­cussed as well. 		 
poster icon Poster THPAB049 [1.409 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB049  
About • paper received ※ 12 May 2021       paper accepted ※ 12 July 2021       issue date ※ 02 September 2021  
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