Revision as of 17:12, 26 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	CATH. Voltage (kV)	[math]\displaystyle{ \Delta }[/math] V	Shutter	source	run number	Notes
10/23	2.870	0	Open	off	7916	3h 45min
10/23	2.870	0	Closed	off	7917	12h 12min
10/23	2.995	125	Open	off	7912
10/23	2.995	125	Closed	off	7913
10/25	3.050		Open	off	7920	5min
10/25	3.050		Closed	off	7926	5min
10/25	3.030		Open	off	7921	6min
10/25	3.030		Closed	off	7925	5min
10/25	3.000		Open	off	7923
10/25	3.000		Closed	off	7924
10/23	3.120	250	Open	off	7899
10/23	3.120	250	Closed	off	7900
10/23	3.245 (redo)	375	Open	off	7904
10/23	3.245	375	Closed	off	7905
10/23	3.245	375	Open	off	7928	21min
10/23	3.245	375	Closed	off	7927
10/23	3.370	500	Open	off	7908 (22')
10/23	3.370	500	Closed	off	7909
10/23	3.735		Open	off	7933	2k Hz 3 min. rate
10/23	3.735		Closed	off	7932	0.5-1k Hz 3 min.

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
10/23	open	off	7907	2 min CATH 3435 V
10/23	Closed	off	7906	2 min CATH 2435 V
10/23	open	off	7911	2 min CATH 3435 V
10/23	Closed	off	7910	2 min CATH 2435 V
10/23	open	off	7915	2 min CATH 3435 V
10/23	Closed	off	7914	2 min CATH 2435 V
10/25	open	off	7919	3 min CATH 3435 V
10/25	Closed	off	7918	3 min CATH 2435 V
10/26	open	off	7929	2 min CATH 3435 V
10/26	Closed	off	7931	2 min CATH 2435 V

GO BACK [1]

@@ Line 52: / Line 52: @@
 |-
 | 10/23||3.370  || 500 || Closed || off || 7909||
+|-
+|10/23|| 3.735  || || Open ||off || 7933 || 2k Hz 3 min. rate [[File:CATH3.370_GEM2.87_7932c_7933.png |100px ]]
+|-
+| 10/23||3.735  ||  || Closed || off || 7932||0.5-1k Hz 3 min.
 |}