Spark probability measurement Spark probability measurement for GEM for CBM for GEM for CBM (Summary of the beam test at CERN SPS, (Summary of the beam test at CERN SPS, October 2011) October 2011) Saikat Biswas, A. Abuhoza, U. Frankenfeld, C. Garabatos, J. Hehner, T. Morhardt, C.J. Schmidt, H.R. Schmidt, J. Wiechula GSI Detector Laboratory RD51 Mini week, 13-15 June 2012, CERN 1
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Saikat Biswas , A . Abuhoza , U . Frankenfeld , C. Garabatos ,
Spark probability measurement for GEM for CBM (Summary of the beam test at CERN SPS, October 2011). Saikat Biswas , A . Abuhoza , U . Frankenfeld , C. Garabatos , J. Hehner , T. Morhardt , C.J. Schmidt , H.R. Schmidt, J. Wiechula GSI Detector Laboratory. - PowerPoint PPT Presentation
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Spark probability measurement for Spark probability measurement for GEM for CBM GEM for CBM (Summary of the beam test at CERN SPS, (Summary of the beam test at CERN SPS, October 2011)October 2011)Saikat Biswas, A. Abuhoza, U. Frankenfeld, C. Garabatos, J. Hehner, T. Morhardt, C.J. Schmidt, H.R. Schmidt, J. Wiechula
GSI Detector Laboratory
RD51 Mini week, 13-15 June 2012, CERN
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Outline of the talkOutline of the talkMotivationTest set-upAnalysis and ResultsSummary and future plan
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GEM for CBM GEM for CBM Triple GEM as a precise tracking
detector in the Muon Chamber (MUCH) under the extreme conditions of the CBM experiment
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ObjectiveObjectiveTo measure the properties of
GEM with shower and in particular Spark probabilities of Double mask and Single mask GEM
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Summary of beam testSummary of beam testDetectors
◦ 2 Double mask GEM
◦ 1 Single mask GEM
Measurement with◦ Pion beam◦ Pion beam with
absorber: Shower
Measured parameters◦ Current◦ Voltage◦ Trigger and GEM
Counts◦ GEM signal
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Voltage distribution in Voltage distribution in GEMGEM
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Details of the set upDetails of the set upGas mixture: Ar/CO2: 70/307 channel HVG210 power supply2 sum-up boards are used for
signal (2×128 6×6 mm2 pads) for DM GEM
4 sum-up boards are used for signal (4×128 4×4 mm2 pads) for SM GEM
PXI LabView based DAQ is used 7
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Set-up for Pion beamSet-up for Pion beam
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Set-up for showerSet-up for shower
Ref. A. Senger 10
Particle production during Particle production during shower from FLUKA simulationshower from FLUKA simulation
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Comparison of shower number Comparison of shower number from measurement and from measurement and simulationsimulation
CurrentCurrent
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Current and GEM counting rate:Current and GEM counting rate:Pion beam 300 kHzPion beam 300 kHz
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Current and GEM counting rate Current and GEM counting rate during Shower: Beam rate300 during Shower: Beam rate300 kHzkHz
Pion beam Pion beam with absorber
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Current as a function of Current as a function of rate for DM GEMrate for DM GEM
Charge Vs. current for DM Charge Vs. current for DM GEMGEM
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Pion beamPion beam with absorber
Slope: -1.38×10-12
Slope: -2.04×10-12
Pion beam Pion beam with absorber
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Current as a function of rate for Current as a function of rate for SM GEMSM GEM
Charge Vs. current for SM Charge Vs. current for SM GEMGEM
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Pion beamPion beam with absorber
Slope: -1.35×10-12
Slope: -1.52×10-12
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EfficiencyEfficiency
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Efficiency during showerEfficiency during shower
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Efficiency as a function of rate Efficiency as a function of rate during showerduring shower
Efficiency for pion beamEfficiency for pion beam
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Efficiency vs. rate for pion Efficiency vs. rate for pion beambeam
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Spark probability Spark probability measurementmeasurement
Methods of Spark detectionAbsence of signal
◦Drop in the counting rate of GEM signals
◦Data from sampling ADCDetection of high current
◦Sudden increase in the Current (Slow)
◦Built in Trip checker in HVG210 Power supply (Fast)