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Cherenkov counters settings
Cherenkov Settings:
Electron runs:
- Discriminator threshold: C1=140 mV, C2=150mV
- Pressure settings- For electron runs:
Energy | C1 pressure | C2 pressure |
|---|---|---|
0.5 GeV | 0.9 bars | 0.95 bars |
1 | 0.9 | 0.95 |
2 | 0.8 | 0.95 |
3 | 0.8 | 0.95 |
4 | 0.5 | 0.6 |
5 | 0.3 | 0.3 |
6 | 0.22 | 0.22 |
7 | 0.18 | 0.18 |
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Proton runs:
- Discriminator threshold: C1= 30 mV, C2 = 30 mV
- Pressure settings For proton runs:
Energy | C1 pressure | C2 pressure |
|---|---|---|
6 - 10 GeV | 2 bars | 2 bars |
Instructions to set Cherenkov counters pressure
Note: at least once a day the cherenkov counters need to be completely evacuated and refilled. This operation takes about half an hour.
The Cherenkov rack is divided in two parts: the upper part for C1, the lower part for C2. All the operations must be performed on both Cs.
How to empty Cherenkov counters:
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- Go back to the general Cherenkov rack and close the main T9 cherenkov lever (horizontal position)
Thresholds