Difference: RPCRandDPlots (18 vs. 19)

Revision 192018-10-31 - AndreaGelmi

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Figure Description
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/twiki/pub/CMSPublic/RPCRandDPlots/current.png RE2/2 Irradiated current scans at different integrated charge. Current remains stable. No HF effects observed. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/current_6p5.png RE2/2 Irradiated and reference current at 6.5 kV (ohmic contribute). Current remains stable. No HF effects observed. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/current_9p6.png RE2/2 Irradiated and reference current at 9.6 kV (gas amplification contribute). Current remains stable. No HF effects observed. Contact : cms-rpc-upgrade-coordinators at cern.ch
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/twiki/pub/CMSPublic/RPCRandDPlots/current.png RE2/2 Irradiated current scans at different integrated charge. Current remains stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/current_6p5.png RE2/2 Irradiated and reference current at 6.5 kV (ohmic contribute). Current remains stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/current_9p6.png RE2/2 Irradiated and reference current at 9.6 kV (gas amplification contribute). Current remains stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
 
/twiki/pub/CMSPublic/RPCRandDPlots/ratioRE2.png RE2/2 Current and rate ratio between irradiated and non-irradiated reference chambers as a function of the integrated charge. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/ratioRE4.png RE4/2 Current and rate ratio between irradiated and non-irradiated reference chambers as a function of the integrated charge. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/T1-MEAN_resistivity_vs_Time.png Average resistivity as a function of the time for the four chambers. Resistivity values corrected for the temperature. 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/dark_current.png RE2/2 Irradiated current scans at different integrated charge. The 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) current at 6.5 kV (ohmic contribute). The current remains almost stable. Contact : cms-rpc-upgrade-coordinators at cern.ch

/twiki/pub/CMSPublic/RPCRandDPlots/darck_wp.png RE2/2 Irradiated (red) and reference (blue) current at 9.6 kV (gas amplification contribute). The current remains almost stable. Contact : cms-rpc-upgrade-coordinators at cern.ch

/twiki/pub/CMSPublic/RPCRandDPlots/noise.png RE2/2 Irradiated (red) and reference noise rate (blue) at 9.6 kV (gas amplification contribute). The noise rate remains almost stable and below 1 Hz/cm2. Contact : cms-rpc-upgrade-coordinators at cern.ch

/twiki/pub/CMSPublic/RPCRandDPlots/ratio-re2.png RE2/2 Current (red) and rate (blue) ratio between irradiated and reference chambers as a function of the integrated charge. The measurements show a decreasing trend at the beginning of the irradiation period, up to ≈ 300 mC/cm2 , when the operating conditions, in terms of gas flow rate and relative gas humidity, were too low with respect to the high gamma background rate. These operating conditions leads to the electrodesí resistivity increase, which caused the observed rate and current decrease. Contact : cms-rpc-upgrade-coordinators at cern.ch

/twiki/pub/CMSPublic/RPCRandDPlots/ratio_current-resistivity.png RE2/2 resistivity variation (blue) and current ratio (red) as a function of the integrated charge. The resistivity is measured running the RPCs filled with pure Argon. The resistivity variation allows to cancel out the dependence on the environmental conditions, and is defined as (Irr-Ref/Irr). The measurements show a decreasing trend at the beginning of the irradiation period, up to around 300 mC/cm 2 , when the operating conditions, in terms of gas flow rate and relative gas humidity, were too low with respect to the high gamma background rate. These operating conditions leads to the electrodesí resistivity increase, which caused the observed rate and current decrease. These plots show also that the resistivity increase is a recoverable effect, in fact the resistivity start to decrease, and the current and rate to increase, when the gas flow and the gas relative humidity have been increased. Contact : cms-rpc-upgrade-coordinators at cern.ch
 
/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
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/twiki/pub/CMSPublic/RPCRandDPlots/eff600.png RE2/2 hit efficiency as a function of the effective HV taken with about 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
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/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
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/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
/twiki/pub/CMSPublic/RPCRandDPlots/darck_wp.png RE2/2 Irradiated (red) and reference (blue) dark current (without background) at 9.6 kV (gas amplification contribute). The dark current remains almost stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/noise.png RE2/2 Irradiated (red) and reference noise rate (without background) (blue) at 9.6 kV (gas amplification contribute). The noise rate remains almost stable and below 1 Hz/cm2. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/ratio-re2.png RE2/2 Current (red) and rate (blue) ratio between irradiated and reference chambers as a function of the integrated charge. The ratio between values of the irradiated and reference chambers is to exclude the dependence on the external parameters. The measurements show a decreasing trend at the beginning of the irradiation period, up to ≈ 300 mC/cm2 , when the operating conditions, in terms of gas flow rate and relative gas humidity, were too low with respect to the high gamma background rate. These operating conditions leads to the electrodesí resistivity increase, which caused the observed rate and current decrease. Contact : cms-rpc-upgrade-coordinators at cern.ch
/twiki/pub/CMSPublic/RPCRandDPlots/ratio_current-resistivity.png RE2/2 resistivity variation (blue) and current ratio (red) as a function of the integrated charge. The resistivity is measured running the RPCs filled with pure Argon. The resistivity variation allows to cancel out the dependence on the environmental conditions, and is defined as (Irr-Ref/Irr). The measurements show a decreasing trend at the beginning of the irradiation period, up to around 300 mC/cm 2 , when the operating conditions, in terms of gas flow rate and relative gas humidity, were too low with respect to the high gamma background rate. These operating conditions leads to the electrodesí resistivity increase, which caused the observed rate and current decrease. These plots show also that the resistivity increase is a recoverable effect, in fact the resistivity start to decrease, and the current and rate to increase, when the gas flow and the gas relative humidity have been increased. Contact : cms-rpc-upgrade-coordinators at cern.ch
 
/twiki/pub/CMSPublic/RPCRandDPlots/current_vs_rate.png Evolution of the density current 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 current remains stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
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/twiki/pub/CMSPublic/RPCRandDPlots/muon_cluster.png Evolution of the muon cluster size at the working point, for RE2/2 irradiated chambers as a function of the gamma rate per unit area. The muon cluster size is defined as the number of fired strips per muon. 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 muon cluster size remains stable. Contact : cms-rpc-upgrade-coordinators at cern.ch
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/twiki/pub/CMSPublic/RPCRandDPlots/gamma_cluster.png Evolution of the gamma cluster size at the working point, for RE2/2 irradiated chambers as a function of the gamma rate per unit area. The muon cluster size is defined as the number of fired strips per gamma. 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 gamma cluster size remains stable.Contact : cms-rpc-upgrade-coordinators at cern.ch
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/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
 
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/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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