Difference between revisions of "IAC-QDC Measurements"
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| − | |6244_close & 6246_open || ||||shutter open and close V_GEM=2.7 V_cat= 3.3 kV [[File:sh_open_close_3.3_2.7.png | 100 px]] | + | |6244_close & 6246_open || ||||shutter open and close V_GEM=2.7 V_cat= 3.3 kV, 6 db att. [[File:sh_open_close_3.3_2.7.png | 100 px]] |
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Revision as of 02:22, 6 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 |  
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| 6077 | 13:34 :37 | 14:19:05 | shutter close, pmt is connected to ch#11 qdc and ch#27 tdc |   
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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 
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| 6221 | 17:57:08 | 18:03:52 | shutter close V_GEM= V_cat but still there are two peaks. N= 0.002475248 
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| 6222 | 18:20:48 | 18:21:04 | shutter open V_GEM= V_cat but still there are two peaks.high noise rate 14 kHz 
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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 
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| 6227 | 16:52:39 | 16:58:07 | n= 0.00304878 shutter open V_GEM= V_cat discriminator's threshold decreased to 57 mV 
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| 6228 | 17:12:06 | 17:26:24 | shutter open V_GEM=2.8 kV V_cat = 3.4 kV 
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| 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
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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 
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| 6244_close & 6246_open | shutter open and close V_GEM=2.7 V_cat= 3.3 kV, 6 db att. 
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