Author: Rusack, R.
Paper Title Page
MOCL2 Design of a Novel Cherenkov Detector System for Machine Induced Background Monitoring in the CMS Cavern 33
 
  • S. Orfanelli, A.E. Dabrowski, M. Giunta
    CERN, Geneva, Switzerland
  • M.J. Ambrose, A. Finkel, R. Rusack
    University of Minnesota, Minneapolis, Minnesota, USA
  • D.P. Stickland
    PU, Princeton, New Jersey, USA
  
  A novel de­tec­tor sys­tem has been de­signed for an ef­fi­cient on­line mea­sure­ment of the ma­chine in­duced back­ground in the CMS ex­per­i­men­tal cav­ern. The sup­pres­sion of the CMS cav­ern back­ground orig­i­nat­ing from pp col­li­sion prod­ucts and the 25 ns bunch spac­ing have set the re­quire­ments for the de­tec­tor de­sign. Each de­tec­tor unit will be a ra­di­a­tion hard, cylin­dri­cal Cherenkov ra­di­a­tor op­ti­cally cou­pled to an ul­tra-fast UV-sen­si­tive pho­to­mul­ti­plier tube, pro­vid­ing a prompt, di­rec­tion­ally sen­si­tive mea­sure­ment. Sim­u­la­tion and test beam mea­sure­ments have shown the achiev­abil­ity of the goals that have dri­ven the base­line de­sign. The sys­tem will con­sist of 20 az­imuthally dis­trib­uted de­tec­tors per end, in­stalled at a ra­dius of r ~ 180 cm and a dis­tance 20.6 m away from the CMS in­ter­ac­tion re­gion. The de­tec­tor units will en­able a mea­sure­ment of the trans­verse dis­tri­b­u­tion of the bunch-by-bunch ma­chine in­duced back­ground flux. This will pro­vide im­por­tant feed­back from the CMS on the beam con­di­tions dur­ing the LHC ma­chine setup and com­par­isons to ex­pec­ta­tions based on FLUKA sim­u­la­tions.  
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