Difference between revisions of "IAC-QDC Measurements"
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=10/04/13= | =10/04/13= | ||
− | Measurement settings, amp. 1x 50 ns differentiation, discriminator 100 mV, so the signal is 100 mV and noise is 30 mV. | + | 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 is lowered to 73 mV to the measure the noise charge on the ADC. | + | discriminator's threshold is lowered to 73 mV to the measure the noise charge on the ADC. |
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|Run Number || Start time || End time || Notes | |Run Number || Start time || End time || Notes | ||
|- | |- | ||
− | |6226 || 16:34:09 || 16:46:44 || shutter close V_GEM= V_cat [[File: | + | |6226 || 16:34:09 || 16:46:44 || shutter close V_GEM= V_cat [[File:6226_equalV_sh_close.png | 100 px]] |
+ | |- | ||
+ | |6227 || 16:52:39 || 16:58:07 || n= 0.00304878 shutter open V_GEM= V_cat discriminator's threshold decreased to 57 mV [[File:6227_equalV_sh_open.png | 100 px]] | ||
+ | |||
+ | |- | ||
+ | |6228 || 17:12:06 || 17:26:24 || shutter open V_GEM=2.8 kV V_cat = 3.4 kV [[File:6228_28_34_sh_open.png | 100 px]] | ||
+ | |- | ||
+ | |6229 || 17:30:25 || 17:48:58|| shutter close V_GEM=2.8 kV V_cat = 3.4 kV [[File:6229_28_34_sh_close.png | 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 | ||
+ | [[File:shutter_open_close_3.4_2.8.png| 100 px]] 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. | ||
+ | |||
+ | |||
+ | |||
+ | {| border="1" cellpadding="4" | ||
+ | |- | ||
+ | |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 [[File:6237_sh_open_140mV.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]] | ||
+ | |- | ||
+ | |6244_close & 6246_open || ||||shutter open and close V_GEM=2.7 V_cat= 3.3 kV [[File:2.7_3.3kV_noise.png| 100 px]] | ||
+ | |- | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |} | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | =10/07/13= | ||
+ | |||
+ | Measurement settings, amp. 2x ,differentiate 50 ns, discriminator's threshold is 107 mV. | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | {| border="1" cellpadding="4" | ||
+ | |- | ||
+ | |Run Number || Start time || End time || Notes | ||
+ | |- | ||
+ | |6293 6294 6295|| || || shutter open and close V_GEM=2.8 V_cat= 3.4 kV [[File:6293_4_sh_open_close.png | 100 px]] lower gas flow. | ||
+ | |||
+ | |- | ||
+ | |6293 6294 6295|| || || shutter open and close V_GEM=2.8 V_cat= 3.1 kV [[File:623-4-5_sh_open_close.png | 100 px]] low gas flow and lower V_cat | ||
+ | |||
+ | |- | ||
+ | |6301c 6302o 6295|| || || shutter open and close V_GEM=2.8 V_cat= 3.1 kV [[File:6301-2_sh_open_close.png | 100 px]] 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. | ||
+ | |||
+ | {| border="1" cellpadding="4" | ||
+ | |- | ||
+ | |Run Number || notes|| running time || image | ||
+ | |- | ||
+ | |6527 || shutter open rate 21 Hz || 25'|| [[File:6527_open.png | 100 px]] | ||
+ | |- | ||
+ | |6528 || shutter close 48 Hz ||time:10' and 23"|| [[File:6528_close.png | 100 px]] | ||
+ | |- | ||
+ | |6529 || shutter close 22 Hz ||time:22' and 6"|| [[File:6529_close.png | 100 px]] | ||
+ | |- | ||
+ | |6529 || shutter close 0.028 Hz V_cat = V_gem||3' 12"|| [[File:6532_close.png | 100 px]] | ||
+ | |||
+ | |||
+ | |} | ||
+ | |||
+ | =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. | ||
+ | |||
+ | |||
+ | {| border="1" cellpadding="4" | ||
+ | |- | ||
+ | |Run Number || notes|| running time || image | ||
+ | |- | ||
+ | |6531 || shutter close 25 Hz ||time:10' and 23"|| [[File:6531_close.png | 100 px]] | ||
+ | |- | ||
+ | |6529 || shutter close 22 Hz ||time:22' and 6"|| [[File:6529_close.png | 100 px]] | ||
+ | |} |
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 | ![]() ![]() |
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.
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
|
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.
10/07/13
Measurement settings, amp. 2x ,differentiate 50 ns, discriminator's threshold is 107 mV.
10/28/13
voltage at 2.7, 3.0 kV.
Discriminator level at 150 mV, filter amp 6 and fine level 6.
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" | ![]() |