| 0505 | Remove Ba-133 source and replace top shielding polyethylene-lead quadrant. Perhaps the presence of the source causes a higher trigger rate than the DAQ can handle. It's unlikely though, as the DAQ hasn't had trouble in the past. However, still worth checking out as the third DCRC may have complicated matters. |
| | 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 four 30-minute data series each at +/-2 V & -/+2 V biases. 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 look fine. Trigger rate is around 3 Hz during test data series. |
| | Take advantage of detector flash to fill N2 cold trap full. |
| 1605 | Fed Cricket 5 pellets. |
| 1616 | Filled LN2 cold trap. |
| 1640 | Began LHe Transfer (26.4%). |
| 1725 | End LHe transfer (91.3%). |
| 2210 | Each data series taken this morning featured one file. Seems as though the problem isn't as simple as the DAQ having problems with a higher trigger rate due to the presence of the Ba-133 source. |
| | Reset DAQ, reset DCRCs (cycle the power). Hopefully, whatever is causing the problem will be flushed out of the system. Restore timing link and start zapping SQUIDs: start with DCRC33 (DIB 1). |