Author: Belohrad, D.
Paper Title Page
TUPC155 Optimisation of the LHC Beam Current Transformers for Accurate Luminosity Determination 1395
 
  • J-J. Gras, D. Belohrad, M. Ludwig, P. Odier
    CERN, Geneva, Switzerland
  • C. Barschel
    RWTH, Aachen, Germany
  
  Dur­ing the 2010 and 2011 LHC runs a se­ries of ded­i­cat­ed fills were used for lu­mi­nos­i­ty cal­i­bra­tion mea­sure­ments at each of the LHC ex­per­i­ments. A major con­tri­bu­tion to the final pre­ci­sion of these lu­mi­nos­i­ty cal­i­bra­tion cam­paigns orig­i­nat­ed from the ab­so­lute ac­cu­ra­cy of the bunch cur­rent pop­u­la­tion es­ti­ma­tion. The im­por­tance of these mea­sure­ments for the LHC physics com­mu­ni­ty trig­gered a large and fruit­ful col­lab­o­ra­tion be­tween the CERN Beam In­stru­men­ta­tion Group and the LHC Ex­per­i­ments to push the LHC Beam Cur­rent Trans­form­ers per­for­mance to their limit. This paper will re­port on the avail­able in­stru­ments for beam cur­rent mea­sure­ments, the method­ol­o­gy used to im­prove them and the re­sults ob­tained.