Author: Wünderlich, D.
Paper Title Page
WEPAB141 Preliminary Simulation of CERN’s Linac4 H− Source Beam Formation 2947
 
  • A. Vnuchenko, J. Lettry
    CERN, Geneva, Switzerland
  • U. Fantz, S. Mochalskyy, D. Wünderlich
    MPI/IPP, Garching, Germany
  • T. Minea, A. Revel
    CNRS LPGP Univ Paris Sud, Orsay, France
  
  Linac4 is the new (H−) lin­ear in­jec­tor of CERN’s ac­cel­er­a­tor com­plex. This con­tri­bu­tion de­scribes the mod­el­ling ac­tiv­i­ties re­quired to get in­sight into H− beam for­ma­tion processes and their im­pact on beam prop­er­ties. The sim­u­la­tion re­gion starts from a ho­mo­ge­neous hy­dro­gen plasma, the plasma then ex­pands through the mag­netic fil­ter field. H− ions and elec­trons are elec­tro­sta­t­i­cally ex­tracted through the menis­cus (line of sep­a­ra­tion be­tween the plasma and the ex­tracted beam) and even­tu­ally ac­cel­er­ated. The physics is sim­u­lated via the 3D PIC code ONIX. This code, orig­i­nally ded­i­cated to ITER’s neu­tral in­jec­tor sources, has been mod­i­fied to match sin­gle aper­ture sources. A new type of bound­ary con­di­tion is de­scribed, as well as the field dis­tri­b­u­tion and geom­e­try of the stan­dard IS03 and a ded­i­cated proto-type of CERN’s Linac4 H− source. A plasma elec­trode pro­to­type de­signed to pro­vide metal­lic bound­ary con­di­tions was pro­duced and tested. This plasma elec­trode geom­e­try en­ables Op­ti­cal Emis­sion Spec­troscopy in the re­gion clos­est to menis­cus. A set of plasma pa­ra­me­ters was cho­sen as input char­ac­ter­iz­ing the plasma. Pre­lim­i­nary sim­u­la­tion re­sults of beam for­ma­tion re­gion are pre­sented.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB141  
About • paper received ※ 18 May 2021       paper accepted ※ 02 June 2021       issue date ※ 31 August 2021  
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