Author: Boehme, C.    [Böhme, C.]
Paper Title Page
MOPAB319 Development of a Fast Betatron Tune and Chromaticity Measurement System for COSY 983
 
  • P.J. Niedermayer, C. Böhme, B. Breitkreutz, V. Kamerdzhiev, A. Lehrach
    FZJ, Jülich, Germany
  • A. Lehrach
    RWTH, Aachen, Germany
 
  A fast tune mea­sure­ment is de­vel­oped for the Cooler Syn­chro­tron COSY at the In­sti­tut für Kern­physik of Forschungszen­trum Jülich. Be­ta­tron os­cil­la­tions of the beam are ex­cited with a band-lim­ited RF sig­nal via a stripline kicker. Res­o­nant trans­verse os­cil­la­tions are then ob­served using ca­pac­i­tive beam po­si­tion mon­i­tors. Based on the bunch-by-bunch beam po­si­tion data the be­ta­tron tune is de­ter­mined. The usage of bunch-by-bunch data is char­ac­ter­is­tic of the new sys­tem. It al­lows for a dis­crete tune mea­sure­ment within a few mil­lisec­onds, as well as con­tin­u­ous tune mon­i­tor­ing dur­ing beam ac­cel­er­a­tion. The high pre­ci­sion tune mea­sure­ment also en­ables de­ter­mi­na­tion of the beam chro­matic­ity. There­fore, the beam mo­men­tum is var­ied by means of the RF fre­quency and the sub­se­quent tune change is de­ter­mined. For rou­tine use dur­ing beam op­er­a­tion and ex­per­i­ments, the de­vel­oped method is in­te­grated into the con­trol sys­tem.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB319  
About • paper received ※ 19 May 2021       paper accepted ※ 16 June 2021       issue date ※ 12 August 2021  
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