Author: Sundal, M.V.
Paper Title Page
MOPGF091 White-Rabbit Based Revolution Frequency Program for the Longitudinal Beam Control of the CERN PS 286
 
  • D. Perrelet, Y. Brischetto, H. Damerau, A.V. Villanueva
    CERN, Geneva, Switzerland
  • D. Oberson
    HEIA-FR, Fribourg, Switzerland
  • M.V. Sundal
    IST, Lisboa, Portugal
  
  The mea­sured bend­ing field of the CERN Pro­ton Syn­chro­tron (PS) is re­ceived in real-time by the lon­gi­tu­di­nal beam con­trol sys­tem and con­verted into the rev­o­lu­tion fre­quency used as set-point for beam phase and ra­dial loops. With the ren­o­va­tion of the bend­ing field mea­sure­ment sys­tem the trans­mis­sion tech­nique is changed from a dif­fer­en­tial se­quence of pulses, the so-called B-train, to a stream of Eth­er­net frames based on the White Rab­bit pro­to­col. The pack­ets con­tain field, its de­riv­a­tive and aux­il­iary in­for­ma­tion. A new fre­quency pro­gram for the con­ver­sion of the bend­ing field into the rev­o­lu­tion fre­quency, de­pend­ing also on pa­ra­me­ters like ra­dius of the ac­cel­er­a­tor and the par­ti­cle type, has been de­vel­oped. In­stead of stor­ing large con­ver­sion ta­bles from field to fre­quency for fixed pa­ra­me­ters, the fre­quen­cies are di­rectly cal­cu­lated in pro­gram­ma­ble logic (FPGA). In order to re­duce de­vel­op­ment time and keep flex­i­bil­ity, the con­ver­sion is processed in real-time in the FPGA using Xil­inx float­ing-point prim­i­tives mapped by a higher level tool Simulink Sys­tem Gen­er­a­tor. Com­mis­sion­ing with beam of the new fre­quency pro­gram in the PS is pro­gress­ing.
Authors: D. Perrelet, Y. Brischetto, H. Damerau, D. Oberson, M. Sundal, A. Villanueva 		 
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