Difference between revisions of "GEM Fall Studies"
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(New page: == Studies for GEM "pad" readout== * Run list ** General Setup: 90Sr source with scintillator below the GEM as the trigger. Threshold on the scintillator is 40mV. The GEM is a "pad" readou...) |
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== Studies for GEM "pad" readout== | == 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. The gas for GEM is Ar/CO2 at 75/25 mixture. | + | ** 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. | ** DAQ is using the flash ADC with GEM in Chan 1 and Scintillator in Chan 2. | ||
{| class="wikitable" style=text-align: center" cellspacing = "0" border = "1" | {| class="wikitable" style=text-align: center" cellspacing = "0" border = "1" | ||
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 | Event rate = 56/sec | |
| 1028 | No source. Event rate = 10.4 /sec. So maximum GEM efficiency is 81.4%. | |
| 1029 | ||
| 1030 | ||
| 1031 | ||
| 1032 | Low voltage on preamp = 5.0V | |
| 1033 |
