Author: Khole, S.
Paper Title Page
THPAB324 PIP-II 800 MeV Proton Linac Beam Pattern Generator 4426
 
  • H. Maniar, B.E. Chase
    Fermilab, Batavia, Illinois, USA
  • J.E. Dusatko
    SLAC, Menlo Park, California, USA
  • S. Khole
    BARC, Trombay, Mumbai, India
  • D. Sharma
    RRCAT, Indore (M.P.), India
  
  The PIP2 IT Beam Pat­tern Gen­er­a­tor is the sys­tem that syn­chro­nizes beam in­jec­tion and the RF sys­tems be­tween the PIP2 LINAC to the Booster. The RF fre­quen­cies of these two ac­cel­er­a­tor sys­tems are not har­mon­i­cally re­lated. Syn­chro­niza­tion is ac­com­plished by con­trol­ling two MEBT Beam Chop­pers, which se­lect 162.5MHz beam bunches from the LEBT and RFQ to pro­duce an ap­pro­pri­ate re­duced beam bunch pat­tern that en­ables bucket-to-bucket trans­fer to the Booster RF at 46.46MHz (84th har­monic). This chop­ping pat­tern also re­duces the beam cur­rent to an av­er­age of 2mA over the Booster in­jec­tion, match­ing the Linac nom­i­nal beam cur­rent. The BPG also gen­er­ates the RF fre­quency/phase ref­er­ence which the Booster will phase lock to dur­ing in­jec­tion. The BPG is fully pro­gram­ma­ble, al­low­ing for ar­bi­trary beam pat­terns with ad­justable tim­ing pa­ra­me­ters, hav­ing a fine ad­just­ment res­o­lu­tion of 38ps. The lat­ter is ac­com­plished using dig­i­tal sig­nal pro­cess­ing tech­niques. This paper dis­cusses the de­sign of the BPG, its con­struc­tion, test re­sults, and op­er­a­tional ex­pe­ri­ence after being in­te­grated into the PIP2 IT test ac­cel­er­a­tor and con­cludes with a dis­cus­sion of the sys­tem’s per­for­mance and fu­ture plans.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB324  
About • paper received ※ 18 May 2021       paper accepted ※ 01 July 2021       issue date ※ 13 August 2021  
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