GEM performance QDC data graphs
electronics Setup
histogram analysis Shutter Open - Closed in LDS Lab
GEM detector voltage settings:
Discriminator:
Amplification:
Shutter open run 4676 took data for 44480 seconds (12.4 hrs) and Shutter closed run 4675 took data for 28638 seconds (8 hrs)
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| Run 4676 :raw shutter Open ADC spectrum | Run 4675 raw shutter closed ADC spectrum |
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| Run 4676 :NORMALIZED shutter Open ADC spectrum | Run 4675 NORMALIZED shutter closed ADC spectrum |
Assume that the single peak for the Closed shutter spectrum is the result of less charge being liberated by the right most peak of the shutter open spectrum due to the energy lost by the ionizing particle as it travels through the 1mm thick FR4 shutter into the ionization chamber.
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| Run 4676 :raw shutter Open ADC spectrum | Run 4675 raw shutter closed ADC spectrum |
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| Shutter Open - Shutter Closed Difference |
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
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| 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 | 
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| 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.
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| 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
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| 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.
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| 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
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| 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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Data Analysis 1 Amp.set up 6_4.5
For Shutter open bin number 67
| Run Number | Channel Number | Number of Counts | Error (bin width | STD | |
| 4676 | 2960 | 16960 | 45 | ||
| 4680 | 2961 | 11424 | 45 | ||
| 4682 | 2961 | 21595 | 45 |
For shutter close and bin number 57:
| Run Number | Channel Number | Number of Counts | Error (bin width | STD | |
| 4683 | 2516 | 24070 | 45 | ||
| 4679 | 2516 | 15160 | 45 | ||
| 4675 | 2514 | 14200 | 45 |
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 
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| 5198 | 0.96 | 6 level 6 | 8 | 18:12:00 06/03 | 00:05:32 06/04 | open | off | 700Hz 
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| 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
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| 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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which peak is Beta?
Run 5200 has a shift more the other runs, the run represented the charge collected as the shutter is close. Averaging three runs as the shutter is open, then subtracting 5200 are represented by the following figures.
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| Run 4676 :Average of normalized shutter Open ADC spectrum | Run 5200 normalized, shutter closed ADC spectrum |
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| subtracting close from open |
Relative Gain increase
I increased the voltage 50 volts and I had to attenuate 8 db this means that a 50 volt increase in the GEM pre-amplifier resulted in a gain increase of ?.
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
| 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 
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| 5074 | 0.50 | 6 level 6 | 11 | 06:16:00 05/07 | 12:39:58 05/07 | close | on | 10Hz 
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| 5075 | 0.50 | 6 level 6 | 11 | 12:45:04 05/07 | 07:58:00 05/08 | close | off | 10Hz 
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| 5076 | 0.50 | 6 level 6 | 11 | 08:00:44 05/08 | 13:06:40 05/08 | open | off | 10Hz 
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| 5077 | 0.50 | 6 level 6 | 11 | 13:09:56 05/08 | 20:27:39 05/08 | close | off | 10Hz 
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| 5273 | 1.66 | 6 level 6 | 11 | 22:51:57 06/07 | 05:43:14 06/08 | open | off | 10Hz 
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| 5276 | 1.66 | 6 level 6 | 11 | 06:05:48 06/08 | 10:57:48 06/08 | 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 | 17:52:16 06/07 | close | off | 10Hz  |
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| 5266 | 1.63 | 6 level 6 | 17 | 18:02:41 06/07 | 22:23:11 06/07 | open | off | 10Hz  |
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| 5288 | 1.63 | 6 level 6 | 17 | 12:31:44 06/08 | 17:13:18 06/08 | open | on | 10Hz  |
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| 5289 | 1.63 | 6 level 6 | 17 | 17:14:56 06/08 | 21:58:10 06/08 | close | on | 10Hz  |
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| 5290 | 1.63 | 6 level 6 | 17 | 22:01:28 06/08 | 04:09:22 06/09 | open | on | 10Hz  |
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| 5312 | 1.63 | 6 level 6 | 17 | 06:38:52 06/09 | 09:54:10 06/09 | close | on | 10Hz  |
Run List 6 GEM,Cathode 2.8,3.00kV
| 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) |
| 5313 | 1.63 | 6 level 6 | 17 | 10:01:15 06/09 | 12:27:45 06/09 | open | on | 10Hz  |
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| 5314 | 1.63 | 6 level 6 | 17 | 12:31:12 06/09 | 17:14:34 06/09 | close | on | 10Hz  |
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| 5315 | 1.63 | 6 level 6 | 17 | 17:16:41 06/09 | 19:55:41 06/09 | open | on | 10Hz  |
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| 5316 | 1.63 | 6 level 6 | 17 | 19:57:47 06/09 | 00:05:06 06/10 | close | on | 10Hz  |
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| 5317 | 1.63 | 6 level 6 | 17 | 00:07:31 06/10 | 05:26:07 06/10 | open | off | 10Hz  |
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| 5318 | 1.63 | 6 level 6 | 17 | 05:29:18 06/10 | 10:14:35 06/10 | close | off | 10Hz  |
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| 5319 | 1.63 | 6 level 6 | 17 | 10:30:32 06/10 | 14:08:42 06/10 | open | off | 10Hz  |
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| 5320 | 1.63 | 6 level 6 | 17 | 14:11:37 06/10 | 16:56:49 06/10 | close | off | 10Hz  |
Run List 7 GEM,Cathode 2.8,3.2kV
| 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) |
| 5321 | 1.63 | 6 level 6 | 17 | 17:09:10 06/10 | 20:11:35 06/10 | close | off | 10Hz  |
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| 5322 | 1.63 | 6 level 6 | 17 | 20:16:07 06/10 | 22:33:09 06/10 | open | off | 10Hz  |
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| 5323 | 1.63 | 6 level 6 | 17 | 22:38:51 06/10 | 05:43:23 06/11 | open | on | 10Hz  |
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| 5324 | 1.63 | 6 level 6 | 17 | 05:46:57 06/11 | 09:51:05 06/11 | close | on | 10Hz  |
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| 5325 | 1.63 | 6 level 6 | 17 | 09:58:53 06/11 | 10:40:20 06/11 | open | off | 10Hz  |
Run List 8 GEM,Cathode 2.8,3.3kV
| 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) |
| 5326 | 1.63 | 6 level 6 | 17 | 10:43:33 06/11 | 10:40:20 06/11 | open | off | 10Hz  |
Run List 8 GEM,Cathode 2.8,3.4kV
| 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) |
| 5327 | 1.63 | 6 level 6 | 17 | 10:43:33 06/11 | 13:35:20 06/11 | open | off | 10Hz  N= 0.000096339 |
Run List 8 GEM,Cathode 2.8,3.5kV
| 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) |
| 5328 | 1.63 | 6 level 6 | 17 | 13:37:09 06/11 | 13:35:20 06/11 | open | off | 10Hz 90px |
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