Author: Clemente, G.
Paper Title Page
MOPC21 Layout of the BPM System for p-LINAC at FAIR and the Digital Methods for Beam Position and Phase Monitoring 101
 
  • M.H. Almalki, G. Clemente, P. Forck, L. Groening, W. Kaufmann, P. Kowina, C. Krüger, R. Singh
    GSI, Darmstadt, Germany
  • W. Ackermann
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M.H. Almalki
    IAP, Frankfurt am Main, Germany
  • M.H. Almalki
    KACST, Riyadh, Kingdom of Saudi Arabia
  • B.B. Baricevic, R. Hrovatin, P.L. Lemut, M. Znidarcic
    I-Tech, Solkan, Slovenia
  • C.S. Simon
    CEA/DSM/IRFU, France
  
  The planned Pro­ton LINAC at the FAIR fa­cil­ity will pro­vide a beam cur­rent from 35 to 70 mA ac­cel­er­ated to 70 MeV by novel CH-type DTLs. Four-fold but­ton Beam Po­si­tion Mon­i­tor (BPM) will be in­stalled at 14 lo­ca­tions along the LINAC and some of these BPMs are mounted only about 40 mm up­stream of the CH cav­i­ties. The cou­pling of the RF ac­cel­er­at­ing field to the BPMs in­stalled close to the CH cav­i­ties was nu­mer­i­cally in­ves­ti­gated. For the dig­i­tal sig­nal pro­cess­ing using I/Q de­mod­u­la­tion a 'Lib­era Sin­gle Pass H' is fore­seen. The prop­er­ties of this dig­i­ti­za­tion and pro­cess­ing scheme were char­ac­ter­ized by de­tailed lab-based tests. More­over, the per­for­mance was in­ves­ti­gated by a 80 μA Ne4+ beam at 1.4 MeV / u and com­pared to a time-do­main ap­proach and suc­ces­sive FFT cal­cu­la­tion. In par­tic­u­lar, con­cern­ing the phase de­ter­mi­na­tion sig­nif­i­cant de­vi­a­tions be­tween the meth­ods were ob­served and fur­ther in­ves­ti­ga­tions to un­der­stand the rea­son are on­go­ing.  
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