On 28/11/2018:
After pulser walkthrough (see eLog entry #67)
Dismounted targets from ladder - see picture 1 and 2 for upstream and downstream sides respectively
Mounted alpha source on ladder - see pictures 3 and 4 for upstream and downstream sides respectively
New target ladder configuration is now:
| Target Position |
Target |
| 1 |
Blank 3mm |
| 2 |
Blank 10mm |
| 3 |
Nothing |
| 4 |
Alpha-Source |
| 5 |
Nothing |
| 6 |
Nothing |
| 7 |
Nothing |
Dismounted thin CH2 target 50 - it was still attached to the collimator.
Remounted far S2 with 0.9um mylar, remounted far iris arm.
In air, pressures (mBar):
- TPU1 > 1000
- TPU2 > 1000
- TPD1 = 170 (above range)
- TPD2 = 73 (above range)
- CHUP = Sensor Off
- CHDW = No Sensor
Far S2 biased to -130.0V, leak I = 1.55uA. Diode biased to -70.1V, leak I = 0.01uA.
Ratemeter ~9200Hz.
Switched off detectors.
12:05 Ecodry 1 and 2 on. Started opening manual valve.
12:20 Manual valve opened fully, T1600 backing valve opened. Started turbos.
12:30 Pressures (mBar):
- TPU1 = 3.0e-5
- TPU2 = 5.1e-6
- TPD1 = 5.1e-6
- TPD2 = 7.5e-6
- CHUP = Sensor Off
- CHDW = No Sensor
Far S2 biased to -130.0V, leak I = 1.52uA. Diode biased to -70.1V, leak I = 0.01uA.
Rate meter ~ 7000Hz. Ladder set to position #4 - alpha source. Rate meter still ~ 7000Hz.
Run # 181128123940
- Run time: 3428s
- Pulser ON, as before
- Alpha-source
- S2 mylar: 0.9um
- DT ~ 22%
- See attached picture 5 for sample Far S2 front strip spectrum
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