Revision as of 18:12, 23 October 2014

Cathode Voltage Effect on the Peak sensing Spectrum

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

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
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
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
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
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
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

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
10/22	Closed	off	7892	5 min CATH 2930 V
10/22	open	off	7893	2 min CATH 3435 V
10/22	Closed	off	7894	2 min CATH 2435 V
10/23	open	off	7898	5 min CATH 3435 V low shutter close rate
10/23	Closed	off	7897	5 min CATH 2435 V
10/23	open	off	7902	min CATH 3435 V
10/23	Closed	off	7901	2 min CATH 2435 V

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@@ Line 8: / Line 8: @@
 | Date || CATH. Volatage (kV)|| Shutter || source || run number || Notes
 |-
-|10/23|| 3.12  || Open ||off || 7899||
+|10/23|| 3.12  || Open ||off || 7899|| [[File:CATH3.12_GEM2.87_7900c_7899.png |100px ]]
 |-
 | 10/16||3.12  ||Closed || off || 7900||
@@ Line 15: / Line 15: @@
 |}
 = GEM-2.87 kV CATH-3.435 kV=