Difference: RPCRandDPlots (20 vs. 21)

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RPC Longevity @ GIF++

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Plots approved @ GMM 9/4/2018 on indico

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Plots approved: April 2018 updated

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Plots approved: August 2018 TB update

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Figure Description
/twiki/pub/CMSPublic/RPCRandDPlots/eff0.png RE2/2 hit efficiency as a function of the effective HV taken with no irradiation. The efficiency of the RE2/2 chamber is measured during different Test Beams (TB) corresponding to different fractions of the target charge to integrate. No significant variations have been observed in the detector performance. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff600.png RE2/2 hit efficiency as a function of the effective HV taken with a background rate of around 600 Hz/cm2. The efficiency of the RE2/2 chamber is measured during different Test Beams (TB) corresponding to different fractions of the target charge to integrate. An 100V variation of the working point has been observed after having accumulated 45% of the expected integrted charge. The working point increase is due to the bakelite resistivity increase. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff_rescale.png RE2/2 irradiated efficiency as a function of the effective high voltage applied to the gas volume, at different integrated charge values and different background radiation. The effective voltage applied to the gas (HV gas ) is defined as: HV_gas = HV - RI , where the effective voltage applied to the electrodes (HV) is reduced by the voltage drop across the electrodes, which is proportional to the current (I) produced by the ionizing particles and to the bakelite resistance (R). The detector operation regime is invariant with respect to HV_gas , therefore the efficiency as a function of HV_gas does not depends anymore on the background radiation and on the bakelite resistance. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff_aug18.png RE2/2 irradiated efficiency measured at 51% of the expected integrated charge as a function of the effective high voltage, at different background radiation. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff_HVgas_aug18.png RE2/2 irradiated efficiency measured at 51% of the expected integrated charge as a function of the effective high voltage applied to the gas volume, at different background radiation. The effective voltage applied to the gas (HV gas ) is defined as: HV_gas = HV - RI , where the effective voltage applied to the electrodes (HV) is reduced by the voltage drop across the electrodes, which is proportional to the current (I) produced by the ionizing particles and to the bakelite resistance (R). The detector operation regime is invariant with respect to HV_gas , therefore the efficiency as a function of HV_gas does not depends anymore on the background radiation and on the bakelite resistance. Contact : cms-rpc-upgrade-coordinators at cern.ch

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/twiki/pub/CMSPublic/RPCRandDPlots/INT-CHARGE.png Integrated charge versus time, accumulated during the longevity test at GIF++ for RE2/2 (red) and RE4/2 (blue) irradiated chambers. The RE4/2 chamber has been turned on a few months later because of total gas flow limitations. Different slopes account for different irradiation conditions during data taking. Contact : cms-rpc-upgrade-coordinators at cern.ch
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/twiki/pub/CMSPublic/RPCRandDPlots/eff0.png RE2/2 hit efficiency as a function of the effective HV taken with no irradiation. The efficiency of the RE2/2 chamber is measured during different Test Beams (TB) corresponding to different fractions of the target charge to integrate. No significant variations have been observed in the detector performance. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff600.png RE2/2 hit efficiency as a function of the effective HV taken with a background rate of around 600 Hz/cm2. The efficiency of the RE2/2 chamber is measured during different Test Beams (TB) corresponding to different fractions of the target charge to integrate. An 100V variation of the working point has been observed after having accumulated 45% of the expected integrted charge. The working point increase is due to the bakelite resistivity increase. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff_rescale.png RE2/2 irradiated efficiency as a function of the effective high voltage applied to the gas volume, at different integrated charge values and different background radiation. The effective voltage applied to the gas (HV gas ) is defined as: HV_gas = HV - RI , where the effective voltage applied to the electrodes (HV) is reduced by the voltage drop across the electrodes, which is proportional to the current (I) produced by the ionizing particles and to the bakelite resistance (R). The detector operation regime is invariant with respect to HV_gas , therefore the efficiency as a function of HV_gas does not depends anymore on the background radiation and on the bakelite resistance. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff_aug18.png RE2/2 irradiated efficiency measured at 51% of the expected integrated charge as a function of the effective high voltage, at different background radiation. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/eff_HVgas_aug18.png RE2/2 irradiated efficiency measured at 51% of the expected integrated charge as a function of the effective high voltage applied to the gas volume, at different background radiation. The effective voltage applied to the gas (HV gas ) is defined as: HV_gas = HV - RI , where the effective voltage applied to the electrodes (HV) is reduced by the voltage drop across the electrodes, which is proportional to the current (I) produced by the ionizing particles and to the bakelite resistance (R). The detector operation regime is invariant with respect to HV_gas , therefore the efficiency as a function of HV_gas does not depends anymore on the background radiation and on the bakelite resistance. Contact : cms-rpc-upgrade-coordinators at cern.ch
 
/twiki/pub/CMSPublic/RPCRandDPlots/eff_rate.png Evolution of the hit efficiency at the working point, for RE2/2 irradiated chambers as a function of the gamma rate per unit area. The measurements have been repeated after different periods of irradiation (corresponding to 0%, 18%, 31%, 45% and 51% of the total integrated charge expected by the end of HL-LHC), and the efficiency remains stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/dark_current.png RE2/2 Irradiated dark current (without background) curves at different integrated charge. The dark current remains almost stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/dark_stby.png RE2/2 Irradiated (red) and reference (blue) dark current (without background) at 6.5 kV (ohmic contribute). The dark current remains almost stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
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