RD51 Group Saha Institute of Nuclear Physics 14 February, 2014

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Presentation transcript:

RD51 Group Saha Institute of Nuclear Physics 14 February, 2014 Triple GEM Operation RD51 Group Saha Institute of Nuclear Physics 14 February, 2014

Triple-GEM Connection Drift (3mm) Transfer 1 (1mm) Transfer 2 (2mm) Induction (1mm) Cathode GEM1 GEM2 GEM3 Anode 0.1M 0.55M 1.0M 0.5M 0.4375M HV 4 Readout Sectors 0.1M 0.1M 10M 2.2nF 2.2nF 1.0M Filter 10M 10M 10M Divider 07-02-2014 13th RD51 Collaboration Meeting

Voltage Current Tabulation HV (V) I (A) Drift G1T G1B G1 G2T G2B G2 G3T G3B G3 Gain 4750 820 4340 3550 3150 400 2330 1956 374 1141 800 341 2761 4700 811 4290 3510 3110 2300 1933 367 1134 790 344 2565 4650 803 4240 3470 3080 390 2270 1911 359 1121 781 340 2347 4600 794 4190 3430 3040 2250 1890 360 1109 772 337 2105 4550 786 4150 3400 3010 2220 1870 350 1097 764 1844 4500 777 4100 3360 2980 380 2200 1849 351 1085 755 330 1577 4450 768 4050 3320 2945 375 2175 1829 346 1073 747 326 1338 4400 760 4010 3285 2910 2150 1808 342 1061 739 322 1129 4350 751 3965 3250 2880 370 2125 1787 338 1048 730 318 948 4300 742 3920 3210 2840 2100 1767 333 1036 721 315 821

High Voltage Divider Connection

Pulse Height Spectra for 4 Readout Sectors HV = 4450 V Without RC filter 07-02-2014 13th RD51 Collaboration Meeting

Pulse Height Spectra For Different HV With RC filter 07-02-2014 13th RD51 Collaboration Meeting

Gain Variation with High Voltage (before RC filter) Assumed that the voltage divider configurations are same in both the cases ! No idea whether the HV in CMSGEM is before or after the RC filter ! 07-02-2014 13th RD51 Collaboration Meeting

Gain Variation with High Voltage (before RC filter) and Current