Radiation background with the CMS RPCs at the LHC

Abstract

The Resistive Plate Chambers (RPCs) are employed in the CMS experiment at the LHC as dedicated trigger system both in the barrel and in the endcap. This note presents results of the radiation background measurements performed with the 2011 and 2012 proton-proton collision data collected by CMS. Emphasis is given to the measurements of the background distribution inside the RPCs. The expected background rates during the future running of the LHC are estimated both from extrapolated measurements and from simulation.

CMS RPC Background -- Studies and Measurements

“…Experimental RPC rates at the present LHC luminosity are obtained from the Link-board counts [6] (data transfer boards from FEB to trigger system) of the present chambers. Extrapolation to a higher luminosity scenario can be done based on the already observed linear dependence between the RPC hit rates and the LHC instantaneous luminosity (see Ref.…”

RPC radiation background simulations for the high luminosity phase in the CMS experiment

“…Background radiation studies play a decisive role in understanding the performance of the detectors and could help to improve the design of the muon system upgrade for the high luminosity phase [1]. CMS uses double-gap RPCs [2] with a 2mm gap formed by two parallel bakelite electrodes with a bulk resistivity of about 10 10 Ω•cm.…”

Simulation studies of the impact of the CMS radiation environment on RPC detectors

“…total runtime and normalized to the strip area. No trigger selection is applied at this stage, resulting in an inclusive measurement of the radiation background rates [4].…”