Difference between revisions of "IAC-QDC Measurements"

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|6529 || shutter close  22 Hz ||time:22' and 6"|| [[File:6529_close.png | 100 px]]
 
|6529 || shutter close  22 Hz ||time:22' and 6"|| [[File:6529_close.png | 100 px]]
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|6529 || shutter close  0.028 Hz V_cat = V_gem||3' 12"|| [[File:6532_close.png | 100 px]]
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Latest revision as of 23:19, 28 October 2013

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 6075 tdc gem signal.png 6075 qdc gem signal.png
6077 13:34 :37 14:19:05 shutter close, pmt is connected to ch#11 qdc and ch#27 tdc 6077 qdc gem signal.png 6077 tdc gem signal.png 6077 tdc pmt signal.png


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 6220 adc sh close.png
6221 17:57:08 18:03:52 shutter close V_GEM= V_cat but still there are two peaks. N= 0.002475248 6221 adc sh close.png
6222 18:20:48 18:21:04 shutter open V_GEM= V_cat but still there are two peaks.high noise rate 14 kHz 6222 adc sh open.png




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 6226 equalV sh close.png
6227 16:52:39 16:58:07 n= 0.00304878 shutter open V_GEM= V_cat discriminator's threshold decreased to 57 mV 6227 equalV sh open.png
6228 17:12:06 17:26:24 shutter open V_GEM=2.8 kV V_cat = 3.4 kV 6228 28 34 sh open.png
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

Shutter open close 3.4 2.8.png 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 6237 sh open 140mV.png
6244_close & 6246_open shutter open and close V_GEM=2.7 V_cat= 3.3 kV, 6 db att. Sh open close 3.3 2.7.png
6244_close & 6246_open shutter open and close V_GEM=2.7 V_cat= 3.3 kV 2.7 3.3kV noise.png



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 6293 4 sh open close.png lower gas flow.
6293 6294 6295 shutter open and close V_GEM=2.8 V_cat= 3.1 kV 623-4-5 sh open close.png low gas flow and lower V_cat
6301c 6302o 6295 shutter open and close V_GEM=2.8 V_cat= 3.1 kV 6301-2 sh open close.png 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' 6527 open.png
6528 shutter close 48 Hz time:10' and 23" 6528 close.png
6529 shutter close 22 Hz time:22' and 6" 6529 close.png
6529 shutter close 0.028 Hz V_cat = V_gem 3' 12" 6532 close.png


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" 6531 close.png
6529 shutter close 22 Hz time:22' and 6" 6529 close.png
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