Difference between revisions of "GEM Fall Studies"
From Hall A Wiki
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| 1026 || 3.52 || Scint signal was missing. Forgot to plug it back in after looking at scope. | | 1026 || 3.52 || Scint signal was missing. Forgot to plug it back in after looking at scope. | ||
|- | |- | ||
| − | | 1027 || 3.52 | Event rate = 56/sec | + | | 1027 || 3.52 || Event rate = 56/sec |
|- | |- | ||
| − | | 1028 || 3.52 | No source. Event rate = 10.4 /sec. So maximum GEM efficiency is 81.4%. | + | | 1028 || 3.52 || No source. Event rate = 10.4 /sec. So maximum GEM efficiency is 81.4%. |
|- | |- | ||
| − | | 1029 || 3.52 | | + | | 1029 || 3.52 || |
|- | |- | ||
| − | | 1030 || 3.56 | | + | | 1030 || 3.56 || |
|- | |- | ||
| − | | 1031 || 3.47 | | + | | 1031 || 3.47 || |
|- | |- | ||
| − | | 1032 || 3.47 | Low voltage on preamp = 5.0V | + | | 1032 || 3.47 || Low voltage on preamp = 5.0V |
|- | |- | ||
| − | | 1033 || 3.53 | | + | | 1033 || 3.53 || |
|} | |} | ||
Revision as of 10:52, 28 October 2011
Studies for GEM "pad" readout
- Initial studies (Oct 28, 2011)
- General Setup: 90Sr source with scintillator below the GEM as the trigger. Threshold on the scintillator is 40mV. The GEM is a "pad" readout with one preamp. The gas for GEM is Ar/CO2 at 75/25 mixture.
- DAQ is using the flash ADC with GEM in Chan 1 and Scintillator in Chan 2.
| Run Number | GEM HV | Comment |
|---|---|---|
| 1025 | 3.4kV | Low voltage on preamp = 3.5V |
| 1026 | 3.52 | Scint signal was missing. Forgot to plug it back in after looking at scope. |
| 1027 | 3.52 | Event rate = 56/sec |
| 1028 | 3.52 | No source. Event rate = 10.4 /sec. So maximum GEM efficiency is 81.4%. |
| 1029 | 3.52 | |
| 1030 | 3.56 | |
| 1031 | 3.47 | |
| 1032 | 3.47 | Low voltage on preamp = 5.0V |
| 1033 | 3.53 |
