IAC-QDC Measurements

09/18/13

Detector voltage is 2.8, 3.4 kV for cathode and GEM. filter Amp. (x4 level 6) is used for amplify the GEM's output, ch#5 is used as an ADC input and ch# 31 in TDC

Run Number	Start time	End time	Notes
6075	12:39:16	13:19:33	shutter open
6077	13:34 :37	14:19:05	shutter close, pmt is connected to ch#11 qdc and ch#27 tdc

10/03/13

Detector voltage is 2.8, 3.4 kV for cathode and GEM. filter Amp. (x2 level 6) is used for amplify the GEM's output, ch#5 is used as an ADC input.

Run Number	Start time	End time	Notes
6220	17:34:47	17:55:48	shutter close N = 0.000793021
6221	17:57:08	18:03:52	shutter close V_GEM= V_cat but still there are two peaks. N= 0.002475248
6222	18:20:48	18:21:04	shutter open V_GEM= V_cat but still there are two peaks.high noise rate 14 kHz

10/04/13

Measurement settings, amp. 1x 50 ns differentiation, discriminator's threshold is 100 mV, so the signal is 100 mV and noise is 30 mV.

discriminator's threshold is lowered to 73 mV to the measure the noise charge on the ADC.

Run Number	Start time	End time	Notes
6226	16:34:09	16:46:44	shutter close V_GEM= V_cat
6227	16:52:39	16:58:07	shutter open V_GEM= V_cat discriminator's threshold decreased to 57 mV
6228	17:12:06	17:26:24	shutter open V_GEM=2.8 kV V_cat = 3.4 kV
6229	17:30:25	17:48:58	shutter close V_GEM=2.8 kV V_cat = 3.4 kV 100 px
6230	17:53:11	17:48:58	shutter close V_GEM=2.8 kV V_cat = 3.4 kV gate changed from 300 ns to 2 us , 0 differentiation overflow
6231	17:53:11	17:48:58	shutter close V_GEM=2.8 kV V_cat = 3.4 kV attenuated 6 dB
6232	18:01:03	17:48:58	shutter close V_GEM=2.8 kV V_cat = 3.4 kV threshold increased from 100 mV to 150 mV
6232	18:06:06	17:48:58	shutter close V_GEM=2.8 kV V_cat = 3.4 kV att. 6dB to 2 dB
6235	18:10:54	18:15:27	shutter close V_GEM=2.8 kV V_cat = 3.4 kV att. 6dB