Author: Trabocchi, S.M.
Paper Title Page
MOPAB350 RF Buncher Cavity for Polarized He-3 Beam at BNL 1090
 
  • T. Kanesue, S.M. Trabocchi
    BNL, Upton, New York, USA
  • A. Murata
    TIT, Tokyo, Japan
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
A 100.625 MHz quar­ter wave res­onator type rf buncher cav­ity was fab­ri­cated for po­lar­ized He-3 spin ro­ta­tor beam line at BNL. This cav­ity will be in­stalled in the ex­ist­ing EBIS-To-Booster beam line to pro­vide ef­fec­tive volt­age of more than 40 kV for 2 MeV/u 3He2+ beam. This cav­ity has a large drift tube inner di­am­e­ter of 80 mm and small gap length of 5 mm. The buncher con­sists of 3 sec­tions, which are a cav­ity main body in­clud­ing drift tube, stem, and inner wall, a lid with a power cou­pler, and a lid with an in­duc­tive tuner. The main body was ma­chined from a bulk cop­per only by CNC ma­chin­ing. The re­sult of low power test agreed well with rf sim­u­la­tion with­out any align­ment. The dif­fer­ence be­tween mea­sured and cal­cu­lated res­o­nant fre­quency was <0.1 %, and mea­sured Q value was 92 % of that in sim­u­la­tion. The cav­ity rf de­sign and test re­sults will be shown.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB350  
About • paper received ※ 26 May 2021       paper accepted ※ 28 May 2021       issue date ※ 12 August 2021  
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