IAC-QDC Measurements

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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 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