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RPC Detector Performance and Trigger Efficiency Improvement Report for CMS Operation 2011

This report details the stable performance of the RPC detector during CMS operation in 2011, highlighting the absence of RPC DEAD time and showcasing only 2 RPC problems causing downtime. It includes information on HV module recalibration, current drift, active electronic channels, pressure correction plans, and RPC Trigger Efficiency improvements of the RPC Trigger PAC algorithm. The report also mentions the migration of the Online Software to Trigger Supervisor and the increased geometrical acceptance for better efficiency.

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RPC Detector Performance and Trigger Efficiency Improvement Report for CMS Operation 2011

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  1. RPC operation and Hardware Performance • Annual HV module recalibration – all CAEN A3512N HV module offsets recalibrated • No current drift in the Endcap RPC after the lowering of the UXC environmental Temperature • The average RPC chamber current per wheel or disk is lower than 3 µA for high luminosity beams. • Number of RPC operated in Single Gap mode is unchanged in 2011: 6 in the Barrel and 20 in the Endcap • Number of active electronic channels is very stable ~ 98.5% • A dedicated HV scan was performed to identify the working point (WP) of each RPC roll and each HV channel • Additional Pressure correction is foreseen to be implemented next TS in order to compensate the P-variations • Stable and Reliable performance of RPC detector during the CMS operation - No RPC DEAD time during recent CMS operation, only 2 RPC problems have caused a downtime to CMS data taking! Defined plateau region Knee 95% HV scan fit ε(HV) = εmax/(1 + eSlope (HV-HV50%)) WP=knee+150V

  2. RPC Trigger Performance • In 2011 the RPC Trigger Efficiency has improved due to: • New 3/6 RPC PAC trigger algorithm: in the barrel at least 3out of 6 available layers are required to be fired in order a muon candidate to be generated. 4 layers were required in 2010.  efficiency in the barrel increased • Improved geometrical acceptance: The optical links were rearranged to obtain better geometrical coverage in the gap region between RB0 and RB+/- 1 additional increase of the efficiency in the || ~0.3 • The Entire Online Software was migrated from XDAQ to Trigger Supervisor • Front-end Electronics Threshold Configuration from database • HSCP trigger enabled: The PAC is now able to trigger “slow” particles, which reach the muon system in the next BX . It looks for the coincidence of hits in two consecutive BX, the candidate BX is determined by the BPTX trigger veto. OfflinemuonpT>8GeV/c OfflinemuonpT> 7GeV/c L1 RPC Trigger Efficiency including detector geometrical acceptance and hit efficiency vs L1 CSC or DT trigger

  3. RPC Detector Performance Very Stable Performance after RUN 163233 All RPC chambers working at a fixed applied HV: HV barrel = 9350 Volts SF6 problem + HV scan All RPC chambers working at a fixed applied HV: HV endcap = 9550 Volts SF6 problem + HV scan 20 April 2011 Datataken during the HV scan are analysed and used to define the HV settings per individual HV channel. 3 May 2011 20 April 2011

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