IAC-Peak Sensing Measurements
09/05/13
Detector voltage is 2.8, 3.4 kV for cathode and GEM.
| Run Number | Notes | |
| 5869 | shutter open x | |
| 5872 | shutter close x | |
| 5873 | shutter open x | |
| 5876 | shutter open x | |
| 5877 | shutter close x | |
| 5884 | shutter close 1 | 
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| 5885 | shutter open 1 | 
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| Run Number | Amp level | discriminator level | Notes | |
| 5925 | 50, 4 | 3.6 | shutter close | |
| 5926 | 50, 4 | 3.6 | shutter open | |
| 5927 | 100 | 3.6 | shutter open | |
| 5928 | 200 | 3.6 | shutter open, high amp level | |
| 5929 | 100, 10 | 3.6 | shutter open high amp level | |
| 5930 | 100, 7 | 3.6 | shutter open | |
| 5936 | 100, 7 | 0.1 | shutter open, noise peak channel 74 | |
| 5937 | 100, 7 | 0.1 | shutter open, V_cath = V_GEM,noise peak channel 74 | |
| 5948 | 100, 7 | 1.15 | shutter open, detector is on, no signal overlapping, reached to te signal highest rate, with almost 100% signal to noise ratio. |
The following run has the same setting as the last run, unless there is achange written in the notes.
Charge Calibration
The peak sensing ADC was calibrated using stanford pulse generator, using hte same settings for the spectroscopic amplifier (coarse gain is 100, intergrate is 1, BLR high), the amp. (bipolar) output is delayed then send to the peak sensing ADC ch#7.
| Run Number | +ve sqaure input pulse amplitute (v) +_ 0.02 | CH# | Notes |
| 6078 | 3.10 | 1538 +_ 2 | |
| 6079 | 4.10 | 1405 +_ 3 | |
| 6080 | 1.10 | 1265 +_ 6 | |
| 6082 | 2.10 | 1265 +_ 6 |
Cath_3400 GEM_2800V
| Run Number | start time | end time | time difference | Unix Start time | Unix End time | Unix Time diff | Scaler time | shutter | Notes |
| 5948 | 14:22:14 | 14:36:09 | 00:13:55 | 20:22:14 | 20:36:07 | 00:13:53 | 305,502 | open | scalar time does not match the others |
| 5949 | 15:02:43 | 15:19:59 | 00:17:16 | 21:02:43 | 21:19:56 | 00:17:13 | 377,148 | open | scalar time does not match the others |
| 5950 | 15:20:42 | 15:35:07 | 00:14:25 | 21:20:42 | 21:35:04 | 00:14:22 | open | r5951 and r5952 has the shutter close and integrate 1 | |
| 5951 | 22:41:29 | 22:08:12 | 00:32:47 | close | |||||
| 5952 | 22:12:44 | 22:35:34 | 00:22:50 | close | |||||
| 5953 | 16:37:03 | 15:35:07 | 00:02:04 | 22:37:03 | 22:45:38 | 00:07:35 | close | integrate lower from 1 to 0.5,sthg strange happened, root does not show a picture and the rate increased suddenly to 450 Hz | |
| 5957 | 09:01:07 | 09:25:12 | 00:24:05 | 15:01:07 | 15:25:10 | 00:24:03 | open | integrate 0.5 | |
| 5959 | 09:30:21 | 09:55:15 | 00:24:53 | 15:30:21 | 15:55:12 | 00:24:50 | close | integrate 1 |
Cath_3350 GEM_2750V
| Run Number | start time | end time | time difference | Unix Start time | Unix End time | Unix Time diff | shutter | Notes |
| 5960 | 09:58:42 | 10:30:28 | 00:31:46 | 15:58:42 | 16:30:25 | 00:31 :43 | close | |
| 5961 | 10:30:49 | 11:11:50 | 41'01" | 16:30:49 | 17:11:47 | 40' 58" | close | |
| 5962 | 11:13:03 | 11:28:21 | 15'18" | 17:13:03 | 17:28:18 | 15' 15" | close | |
| 5963 | 11:32:44 | 11:58:39 | 25' 55" | 17:32:43 | 17:58:37 | 25' 52" | open | |
| 5964 | 11:59:17 | 12:21:59 | 22' 42" | 17:59:17 | 18:21:56 | 22' 39" | open | |
| 5965 | 12:22:24 | 12:42:38 | 20'14" | 18:22:24 | 18:42:36 | 20' 12" | open |
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Cath_3300 GEM_2700V
| Run Number | start time | end time | shutter | Notes |
| 5967 | 19:22:05 | 19:48:42 | open | scaler not counting Hz pulse (run 5976 was counting) |
| 5968 | 19:49:04 | 20:15:44 | open | |
| 5969 | 20:15:44 | 20:47:18 | open | |
| 5978 | 11:33:33 | 11:48:05 | close | |
| 5979 | 11:48:27 | 11:59:49 | close | |
| 5980 | 12:00:17 | 12:31:03 | close |
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Cath_3250 GEM_2650V
| Run Number | start time | end time | shutter | Notes |
| 5972 | 20:52:15 | 21:15:18 | open | |
| 5973 | 06:43:29 | 07:29:57 | open | |
| 5974 | 07:30:49 | 08:17:48 | open | |
| 5975 | 08:23:58 | 09:30:48 | close | |
| 5976 | 09:33:58 | 10:42:48 | close | |
| 5977 | 10:43:11 | 11:31:26 | close |
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Cath_3200 GEM_2600V
| Run Number | start time | end time | shutter | Notes |
| 5983 | 17:42:06 | 22:07:02 | close | |
| 5984 | 17:42:06 | 06:43:46 N | close | very low noise level, 0.000023148 |
| 5985 | 06:44:44 | 12:10:48 | close | |
| 5986 | 12:14:53 | 12:59:45 | open | 0.000371471 |
| 6047 | 18:44:41 | 21:21:49 | open |
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Cath_3150 GEM_2550V
| Run Number | start time | end time | shutter | Notes |
| 5954 | 16:55:52 | 08:44:23 N | close | rate changed from 1.2 Hz to 57 Hz due to increase the noise level overnight only. |
| 5966 | 12:44:21 | 19:15:35 | open |
Plots
| 3.4,2.8 kV | 3.35,2.75 kV | 3.3,2.7 kV | 3.25,2.65 kV | 3.2,2.6 kV |
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Peak sensing is sensitive shows not show any difference between shutter open and shutter close, but it shows the change in rate for each case. The charge is directly proportional to the channel number except for the last case that shows the opposite. Also it shows a change of 40 channels as the voltage drops 50V, except for the last two cases, one shoes a drop of 20 channels and the other shows an increase to channel 500.
The peak resolution increases as the GEM voltage increases, a jump to channel 500 at lowest value of voltage for the GEM, but it still does not improve the peak resolution.
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