Author: Orsatti, F.
Paper Title Page
MOPAB026 RHIC Delayed Abort Experiments 126
 
  • M. Valette, D. Bruno, K.A. Drees, K.M. Hartmann, G. Heppner, K. Mernick, C. Mi, J.-L. Mi, R.J. Michnoff, J. Morris, F. Orsatti, E. Rydout, T. Samms, J. Sandberg, V. Schoefer, C. Schultheiss, T.C. Shrey, C. Theisen
    BNL, Upton, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
For RHIC to op­er­ate at its top en­ergy (100 GeV/n) while pro­tect­ing the fu­ture sPHENIX de­tec­tor, spon­ta­neous and asyn­chro­nous fir­ing of abort kicker mod­ules (pre-fires) have to be avoided. A new trig­ger­ing cir­cuit for the abort kick­ers was im­ple­mented with rel­a­tively slow me­chan­i­cal re­lays in se­ries with the stan­dard fast thyra­tron tubes. The re­lays pre­vents un­wanted pre-fires dur­ing op­er­a­tion, but comes at the ex­pense of a long la­tency - about 7 mil­lisec­onds - be­tween the re­moval of beam per­mit and the ac­tual fir­ing of the abort kick­ers. Pro­tec­tion con­sid­er­a­tions of RHIC’s su­per­con­duct­ing mag­nets for­bid de­lay­ing en­ergy ex­trac­tion from the main dipoles and quadrupoles for too long after a quench. The beam has thus to cir­cu­late in both RHIc rings for a few mil­lisec­onds as the cur­rent in di­pole and quadru­pole cir­cuit is being ex­tracted. We pre­sent the re­sults of de­layed abort ex­per­i­ments con­ducted in July 2018 with the analy­sis of fast orbit and tune mea­sure­ments and dis­cuss the safety im­pli­ca­tions of this im­ple­men­ta­tion for fu­ture RHIC op­er­a­tion.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB026  
About • paper received ※ 19 May 2021       paper accepted ※ 26 May 2021       issue date ※ 23 August 2021  
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