GEM performance data graphs
Without a source
- With a source
Shutter Open (Source on - Source off)/Source on vs. discrimination level
The uncertainty is calculated as the following:
u=on v=off
[math]\displaystyle{ Y = U-v/u \,,\,\,\,\,\,\, x = u-v }[/math]
[math]\displaystyle{ dy = y[(dx)^2/x^2 +(du)^2/u^2]^{0.5} }[/math]
[math]\displaystyle{ dx = [(du)^2+ (dv)^2]^{0.5} }[/math]
[math]\displaystyle{ d y = y[(du)^2+(dv)^2/(u^2-v^2)+ (du/u)^2]^{0.5 } }[/math]
Run List1 GEM, Cathode 2.6, 2.9kV
/home/daq/CODA/CODAreader/ROOT_V5.30/V775mV792/evio2nt -fr4685.dat > /dev/null
The voltage of the Cathode is 2.9 kV and of the GEMs is 2.6 kV.
The amplifier is on x6 level fine gain which will amplify the detector signal to 33.5 times (6.56+_ 0+_ V/196 +_ 0.6mV).
| Run # | discrimination level | ortec 474 amplification | Start Date | End Date | Shutter Position | Source | pulse snapshot picture and Comparison notes |
| 4662 | 0.25 | 4 | 17:00 04/04 | 10:00 04/05 | open | off | 
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| 4663 | 1.1 | 4 | 10:00 04/05 | 13:14 04/05 | open | off | 
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| 4664 | 0.9 | 4 | 13:14 04/05 | 16:48 04/05 | open | off | 
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| 4665 | 0.9 | 4 | 17:11 04/05 | 20:21 04/05 | open | on | 
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| 4666 | 1.1 | 4 | 20:26 04/05 | 21:38 04/05 | open | On | 
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| 4668 | 0.25 | 6 | 21:47 04/05 | 7:45 04/06 | open | off | compare ampx4 (blue) and ampx6 (red)  ortec #of counts 1.37M, ADC # of counts 676056
|
| 4670 | 0.25 | 4 | 11:00 04/05 | 11:55 | closed | On | |
| 4671 | 0.25 | 6+ fine level 3 | 12:28:38 04/06 | 12:38 | closed | off | |
| 4672 | 0.25 | 10 | 12:38:28 04/06 | 12:42 | closed | off | |
| 4673 | 0.25 | 6+fine level 5 | 12:42:59 04/06 | 12:47:30 | closed | off | |
| 4674 | 0.25 | 6+fine level 4.5 | 12:48:18 04/06 | 13:01:50 | closed | Off | |
| 4675 | 0.25 | 6+fine level 4.5 | 13:03:35 04/06 | 21:00:55 | closed | Off | 
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| 4676 | 0.25 | 6+fine level 4.5 | 21:06:07 04/06 | 09:27:29 04/07 | open | Off |
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| 4677 | 0.25 | 6+fine level 4.5 | 09:31:03 04/07 | 21:31:07 04/07 | open | on |
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| 4678 | 0.25 | 6+fine level 4.5 | 21:32:10 04/07 | close | on | 
| |
| 4679 | 0.25 | 6+fine level 4.5 | 10:39:19 04/08 | 22:22:21 04/08 | close | off | 
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| 4680 | 0.25 | 6+fine level 4.5 | 22:26:10 04/08 | 10:05:07 04/09 | open | off | 
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| 4681 | 0.25 | 6+fine level 4.5 | 10:08:59 04/09 | 14:26:12 04/09 | open | on | 
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| 4682 | 0.25 | 6+fine level 4.5 | 14:30:43 04/09 | 06:51:39 04/10 | open | off | 
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| 4683 | 0.25 | 6+fine level 4.5 | 06:56:00 04/10 | 16:07:36 04/10 | close | off | 
compare r4683 (red) and r4679 (blue) as both have hsutter is close without source |
| 4684 | 0.25 | 6+fine level 4.5 | 16:10:59 04/10 | 10:46:10 04/11 | close | off | 
compare r4684 (red) and r4683 (blue) as both have hsutter is close without source |
| 4685 | 0.25 | 6+fine level 4.5 | 10:50:52 04/11 | 07:06:55 04/12 | open | off |   r4685 (blue) has the two peaks close in height compared to the other two runs (r4682(red) and r4676(green), which indicates that the source has a new source of charge as result of a decay to one of the short half life alpha emitting daughters.
|
| 4686 | 0.25 | 6+fine level 4.5 | 07:37:34 04/12 | 19:50:55 04/12 | close | off |   comparing three runs together r4686(blue),r4684(red), and r4679 (green). they are all record the charge as the shutter is close. it is noticed that the last run reproduced the expected peak that was observed before in r4679
|
| 4687 | 0.25 | 6+fine level 4.5 | 19:54:17 04/12 | 06:59:28 04/13 | open | off | 
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| 4688 | 0.25 | 6+fine level 4.5 | 07:01:35 04/13 | 10:31:31 04/13 | open | off | 
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| 4689 | 0.25 | 6+fine level 4.5 | 10:33:13 04/13 | 19:09:56 04/13 | close | off |   the new peak (in 4688) was partial blocked by the shutter but the tail is still high compared to 4686.
|
| 4690 | 0.25 | 6+fine level 4.5 | 19:26:44 04/13 | 06:41:16 04/14 | open | off | 
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| 4691 | 0.25 | 6+fine level 4.5 | 21:15:44 04/13 | 09:58:16 04/14 | open | off | 
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| 4692 | 0.25 | 6+fine level 4.5 | 10:05:14 04/15 | 16:34:50 04/15 | open | off |  back to the normal spectrum as the shutter is open
|
| 4693 | 0.25 | 6+fine level 4.5 | 16:41:05 04/15 | 07:29:25 04/15 | close | off | 
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| 4694 | 0.25 | 6+fine level 4.5 | 07:39:30 04/16 | 14:51:29 04/16 | close | off | 
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| 4694 | battery |  |
battery charged collected by the ADC without any electronics used1 | ||||
| 4695 | battery |  |
battery charged collected by the ADC as the battery charge passes through the NIM-modules | ||||
| 4914 | 0.57 | 6+fine level 4.5 | 13:39:25 04/30 | 07:26:42 05/01 | open | off | 
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| 4917 | 0.36 | 6+fine level 4.5 | 10:00:21 05/01 | 14:43:05 05/01 | open | off | 
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| 4918 | 0.36 | 6+fine level 4.5 | 14:53:41 05/01 | 13:56:05 05/01 | open | on | 
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| 4935 | 0.36 | 6+fine level 6 | 16:38:38 05/01 | 07:30:04 05/02 | open | off | 
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| 4936 | 0.36 | 6+fine level 6 | 07:34:01 05/02 | 15:02:30 05/02 | close | off | 
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| 4989 | 0.36 | 6+fine level 6 | 11:47:06 05/03 | 15:40:47 05/03 | close | off |  10Hz
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| 4990 | 0.36 | 6+fine level 6 | 15:44:10 05/03 | 22:36:28 05/03 | open | off |  10Hz
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| 4992 | 0.36 | 6+fine level 6 | 22:57:47 05/03 | 08:51:26 05/04 | close | off |  100Hz clock
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| 5078 | 0.5 | 6+fine level 6 | 20:39:35 05/08 | 06:09:23 05/09 | open | off |  10Hz
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| 5079 | 0.36 | 6+fine level 6 | 06:47:58 05/09 | 14:26:08 05/09 | open | off |  10Hz
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| 5091 | 0.36 | 6+fine level 6 | 16:25:48 05/09 | 21:21:11 05/09 | close | off |  without clock
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| 5092 | 0.36 | 6+fine level 6 | 21:26:23 05/09 | 06:23:34 05/10 | open | off |  10 clock
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| overlayed plots need to be normalized to the running time! | sure |  |
comparing 4691 (light brown),4690(blue),4687 (red),4676 (green),4685 (purple)
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Run List2 GEM,Cathode 2.65,2.95kV
The voltage of the Cathode is 2.95 kV and of the GEMs is 2.65 kV.
| Run # | discrimination level | ortec 474 amplification | Attenuation (dB) | Start Date | End Date | Shutter Position | Source | pulse snapshot picture and Comparison notes |
| 5061 | 0.40 | 6 level 6 | 6 | 12:15:47 05/04 | 18:16:57 05/04 | close | off | 10Hz 
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| 5062 | 0.40 | 6 level 6 | 6 | 18:23:41 05/04 | 16:12:20 05/05 | open | off | 10Hz 
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| 5063 | 0.40 | 6 level 6 | 8 | 16:18:02 05/05 | 22:55:20 05/05 | open | off | 10Hz 
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| 5064 | 0.40 | 6 level 6 | 8 | 22:59:02 05/05 | 07:32:26 05/06 | open | on | 10Hz 
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| 5065 | 0.40 | 6 level 6 | 8 | 07:37:17 05/06 | 12:39:17 05/06 | close | on | 10Hz 
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| 5066 | 0.40 | 6 level 6 | 8 | 02:43:55 05/06 | 17:44:20 05/06 | close | off | 10Hz 
|
| 5198 | 0.96 | 6 level 6 | 8 | 18:12:00 06/03 | 00:05:32 06/04 | open | off | 700Hz 
|
| 5200 | 0.96 | 6 level 6 | 8 | 00:08:49 06/04 | 07:19:28 06/04 | close | off | 10Hz 
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| 5204 | 0.96 | 6 level 6 | 8 | 09:33:45 06/04 | 14:31:49 06/04 | open | off | 10Hz 
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| 5215 | 1.55 | 6 level 6 | 8 | 16:04:59 06/04 | 20:15:59 06/04 | close | off | 10Hz
|
| 5224 | 1.25 | 6 level 6 | 8 | 21:45:45 06/04 | 07:12:49 06/05 | open | off | 10Hz 
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| 5225 | 0.96 | 6 level 6 | 8 | 7:15:51 06/05 | 07:12:49 06/04 | open | off | 10Hz 
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Run List3 GEM,Cathode 2.7,3kV
- Calibration curve
,Measurements
The voltage of the Cathode is 3 kV and of the GEMs is 2.7 kV. Without any attenuation -85 mV was the initial voltage and its equivalent charge is 1.02 nC. According this value the charge below is calculated using
[math]\displaystyle{ Q = Q_0 10^{(L_v/20)} }[/math]
| Run # | discrimination level | ortec 474 amplification | Attenuation (dB) | Start Date | End Date | Shutter Position | Source | pulse snapshot picture and Comparison notes | Channel number | ADC charge (nC) | Detector charge (nC) |
| 5072 | 0.50 | 6 level 6 | 11 | 18:20:09 05/06 | 22:28:25 05/04 | open | off | 10Hz  |
1650 , 3500 | 0.766, 1.506 | 7.7, 15.06 |
| 5073 | 0.50 | 6 level 6 | 11 | 22:31:50 05/06 | 06:09:58 05/07 | open | on | 10Hz 
| |||
| 5074 | 0.50 | 6 level 6 | 11 | 06:16:00 05/07 | 12:39:58 05/07 | close | on | 10Hz 
| |||
| 5075 | 0.50 | 6 level 6 | 11 | 12:45:04 05/07 | 07:58:00 05/08 | close | off | 10Hz 
| |||
| 5076 | 0.50 | 6 level 6 | 11 | 08:00:44 05/08 | 13:06:40 05/08 | open | off | 10Hz 
| |||
| 5077 | 0.50 | 6 level 6 | 11 | 13:09:56 05/08 | 20:27:39 05/08 | close | off | 10Hz 
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Run List 4 GEM,Cathode 2.75,3.05kV
| Run # | discrimination level | ortec 474 amplification | Attenuation (dB) | Start Date | End Date | Shutter Position | Source | pulse snapshot picture and Comparison notes | Channel number | ADC charge (nC) | Detector charge (nC) |
| 5228 | 1.29 | 6 level 6 | 15 | 10:26:45 06/05 | 14:48:25 06/05 | open | off | 10Hz  |
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| 5229 | 1.29 | 6 level 6 | 15 | 14:49:16 06/05 | 19:11:06 06/05 | close | off | 10Hz 
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| 5230 | 1.29 | 6 level 6 | 15 | 19:12:39 06/05 | 04:08:00 06/06 | open | off | 10Hz  |
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| 5235 | 1.29 | 6 level 6 | 15 | 04:10:19 06/06 | 07:35:30 06/06 | close | off | 10Hz 
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| 5236 | 1.29 | 6 level 6 | 15 | 07:36:39 06/06 | 10:04:15 06/06 | open | off | 10Hz  |
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| 5237 | 1.29 | 6 level 6 | 15 | 10:06:54 06/06 | 14:51:54 06/06 | close | off | 10Hz 
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Run List 5 GEM,Cathode 2.8,3.10kV
| Run # | discrimination level | ortec 474 amplification | Attenuation (dB) | Start Date | End Date | Shutter Position | Source | pulse snapshot picture and Comparison notes | Channel number | ADC charge (nC) | Detector charge (nC) |
| 5261 | 1.63 | 6 level 6 | 17 | 17:10:06 06/06 | 21:41:15 06/06 | close | off | 10Hz  |
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| 5262 | 1.63 | 6 level 6 | 17 | 21:43:02 06/06 | 05:53:12 06/07 | open | off | 10Hz  |
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| 5263 | 1.63 | 6 level 6 | 17 | 17:10:06 06/06 | 09:51:53 06/07 | close | off | 10Hz  |
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| 5264 | 1.63 | 6 level 6 | 17 | 09:52:59 06/07 | 14:22:56 06/07 | open | off | 10Hz  |
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| 5265 | 1.63 | 6 level 6 | 17 | 14:24:31 06/07 | 09:51:53 06/07 | close | off | 10Hz  |