| 0000 | Through charge breakdown measurements, we have established that we can bias the detector between +/-4 V & -/+2.5 V. These really are right at the limits of charge breakdown, so it may be wise to decrease this by at least 0.5 V. We know that we can see the Ba-133 peak at -/+2 V, but we can only hold neutralisation in the bulk for 5 minutes. However, we have little idea of the performance in the bulk region at +/-3 V. It may be worthwhile investigating this before we commit to a bias. |
| | Start data acquistion, triggering on charge channels with 0.1 ms trigger delay and 0.4096 ms trace length. OR charge trigger threshold 40 ADC bins for all charge channels, and coincidence time set to 10 μs. Flash for one hour, followed by cool down for 2 hours. Then take ten 30-minute data series at +/-3 V bias. Flash all LEDs for 6 seconds between data series with usual settings, and wait 20 minutes for cryostat to cool. Finish with a 20 minute flash and 2-hour cool down. |
| | Phonon pulses in test data series look fine. Trigger rate is around 10 Hz. |
| 1000 | Fed Cricket 3 pellets. |
| 1350 | Break in data taking, filled LN2 cold trap. |
| 1605 | Started the LHe transfer at 28.6% |
| 1640 | Finished LHe Transfer (91.2%) |
| 1830 | Fed Cricket 4 pellets. |
| 2310 | IbIs curve for phonon channel B3 is rather weird. I have a feeling that the SQUID hasn't been tuned correctly. All other curves look fine. |