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	n= 0.00304878 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
6236	18:18:51	18:22:37	shutter open V_GEM=2.8 kV V_cat = 3.4 kV att. 6dB for the last two runs the figure does not show any difference scope pics and noise level with the new settings.

10/05/13

Measurement settings, amp. 1x ,intergrate 100 ns, 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
6237	18:51:31	16:46:44	shutter open V_GEM=2.8 V_cat= 3.4 kV
6244_close & 6246_open			shutter open and close V_GEM=2.7 V_cat= 3.3 kV, 6 db att.
6244_close & 6246_open			shutter open and close V_GEM=2.7 V_cat= 3.3 kV

10/07/13

Measurement settings, amp. 2x ,differentiate 50 ns, discriminator's threshold is 107 mV.

Run Number	Start time	End time	Notes
6293 6294 6295			shutter open and close V_GEM=2.8 V_cat= 3.4 kV lower gas flow.
6293 6294 6295			shutter open and close V_GEM=2.8 V_cat= 3.1 kV low gas flow and lower V_cat
6301c 6302o 6295			shutter open and close V_GEM=2.8 V_cat= 3.1 kV lower gas flow and low V_cat X-4 amp. disc, 181 mV

10/28/13

voltage at 2.7, 3.0 kV.

Discriminator level at 150 mV, filter amp 6 and fine level 6.

Run Number	notes	running time	image
6527	shutter open rate 21 Hz	25'
6528	shutter close 48 Hz	time:10' and 23"
6529	shutter close 22 Hz	time:22' and 6"
6529	shutter close 0.028 Hz V_cat = V_gem	3' 12"

10/28/13

voltage at 2.75, 3.05 kV.

Discriminator level at 150 mV, filter amp 6 and fine level 6. att11, 6531 overcharge the QDC.

Run Number	notes	running time	image
6531	shutter close 25 Hz	time:10' and 23"
6529	shutter close 22 Hz	time:22' and 6"