Performance of the gas gain monitoring system of the CMS RPC muon   detector
  The RPC muon detector of the CMS experiment at the LHC (CERN, Geneva, Switzerland) is equipped with a Gas Gain Monitoring (GGM) system. A report on the stability of the system during the 2011-2012 data taking run is given, as well as the observation of an effect which suggests a novel method for the monitoring of gas mixture composition. 
L. Benussi (a, Corresponding author), S. Bianco (a), L. Passamonti   (a), D. Piccolo (a), D. Pierluigi (a), G. Raffone (a), ...
physics.ins-det