20min run peak sensing histograms

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Cathode Voltage Effect on the Peak sensing Spectrum

All the measurements have the same GEM voltage 2.87 kV, just cathode voltage changes.

Peak starting 3030v.png

the figure below shows the the spectrum when the cathode at 3.735 kV (865V higher than the top GEM's voltage), which reaches to the maxmum rate that DAQ can measure.

CATH3.370 GEM2.87 7932c 7933.png

Date CATH. Voltage (kV) [math]\Delta[/math] V Shutter source run number Notes
10/23 2.870 0 Open off 7916 3h 45minCATH2.870 GEM2.87 7917c 7916.png
10/23 2.870 0 Closed off 7917 12h 12min
10/23 2.995 125 Open off 7912 CATH2.995 GEM2.87 7913c 7912.png
10/23 2.995 125 Closed off 7913
10/25 3.050 Open off 7920 5minCATH3.050 GEM2.87 7926c 7920.png
10/25 3.050 Closed off 7926 5min
10/25 3.030 Open off 7921 6min CATH3.050 GEM2.87 7925c 7921.png
10/25 3.030 Closed off 7925 5min
10/25 3.000 Open off 7923 CATH3.000 GEM2.87 7924c 7923.png
10/25 3.000 Closed off 7924
10/23 3.120 250 Open off 7899 CATH3.12 GEM2.87 7900c 7899.png
10/23 3.120 250 Closed off 7900
10/23 3.245 (redo) 375 Open off 7904 CATH3.245 GEM2.87 7905c 7904.png
10/23 3.245 375 Closed off 7905
10/23 3.245 375 Open off 7928 21min CATH3.245 GEM2.87 7927c 7928.png
10/23 3.245 375 Closed off 7927
10/23 3.370 500 Open off 7908 (22') CATH3.370 GEM2.87 7909c 7908.png
10/23 3.370 500 Closed off 7909
10/26 3.735 865 Open off 7933 2k Hz 3 min. rate CATH3.370 GEM2.87 7932c 7933.png
10/26 3.735 865 Closed off 7932 0.5-1k Hz 3 min.
10/26 3.585 Open off 7934 1k Hz 123" rate CATH3.370 GEM2.87 7932c 7933.png
10/26 3.585 Closed off 7935 0.5k Hz 118".

GEM-2.87 kV CATH-3.435 kV

Date Shutter source run number Scaler counts (Hz) pedestal Integral in ADC full spectrum (Hz) Integral in ADC spectrum beyond pedestal (Hz) notes
10/16 Open off 7847 150+_7 1429/60 7915/60 5810/60
10/16 Closed off 7846 72+_3 1070/60 4029/60 2817/60
10/16 Open off 7848 137+_16 19 129 111 4runs 7848 62 63 64.png
10/16 Closed off 7862 53+_1 7 47 41
10 /16 Open On 7863 147+_12 30 129 101
10/16 Closed On 7864 67+_4 15 59 45
10/17 Open off 7865 132+_14 28 121 97 4runs 7865 66 68 67.png
10/17 Closed off 7866 95+_7 11 59 49
10 /17 Open On 7868 150+_6 32 128 100
10/17 Closed On 7867 74+_4 13 63 52
10/18 Open off 7872 136+_10 9 124 115 4runs 7872 71 69 70.png
10/18 Closed off 7871 51+_3 4 48 44
10 /18 Open On 7869 140+_10 10 123 115
10/18 Closed On 7870 53+_2 4 49 44
10/19 Open off 7873 124+_14 10 114 104 4runs 7873 74 76 75.png
10/19 Closed off 7874 59+_4 5 54 49
10 /19 Open On 7876 141+_8 10 117 108
10/19 Closed On 7875 60+_4 6 55 50
10/20 Open off 7879 129+_16 8 116 108 4runs 7879 80 82 81.png
10/20 Closed off 7880 49+_2 2 45 42
10 /20 Open On 7882 142+_3 8 108 99
10/20 Closed On 7881 53+_2 5 49 44


Test runs

Date Shutter source run number Notes
10/21 open off 7884 5 min separate pedestal from signal
10/20 Closed off 7885 5 min shows a difference.
10/22 open off 7891 5 min CATH 2930 V CATH2.93 GEM2.87.png
10/22 Closed off 7892 5 min CATH 2930 V


10/22 open off 7893 2 min CATH 3435 V CATH3.435 GEM2.87.png
10/22 Closed off 7894 2 min CATH 2435 V
10/23 open off 7898 5 min CATH 3435 V CATH3.435 GEM2.87 7897c 98.png low shutter close rate
10/23 Closed off 7897 5 min CATH 2435 V
10/23 open off 7902 min CATH 3435 V CATH3.435 GEM2.87 7901c 02.png
10/23 Closed off 7901 2 min CATH 2435 V
10/23 open off 7907 2 min CATH 3435 V CATH3.435 GEM2.87 7906c 07.png
10/23 Closed off 7906 2 min CATH 2435 V
10/23 open off 7911 2 min CATH 3435 V CATH3.435 GEM2.87 7910c 11.png
10/23 Closed off 7910 2 min CATH 2435 V
10/23 open off 7915 2 min CATH 3435 V CATH3.435 GEM2.87 7914c 15.png
10/23 Closed off 7914 2 min CATH 2435 V
10/25 open off 7919 3 min CATH 3435 V CATH3.435 GEM2.87 7918c 19.png
10/25 Closed off 7918 3 min CATH 2435 V
10/26 open off 7929 2 min CATH 3435 V CATH3.435 GEM2.87 7931c 29.png
10/26 Closed off 7931 2 min CATH 2435 V
10/26 open off 7937 2 min CATH 3435 V CATH3.435 GEM2.87 7936c 37.png
10/26 Closed off 7936 2 min CATH 2435 V




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