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2012/11/02

0005 Take advantage of detector flash to fill N2 cold trap full.
1005 Fed Cricket 3 pellets.
1020 Filled LN2 cold trap.
1505 Started LHe transfer at 26.8%
1543 End LHe transfer (90.6%).
1731 Fed Cricket 4 pellets.
2200 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 +/-1.5 V, -/+1.5 V, +/-1 V & -/+1 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.
Pulses from test data set are reasonable. As yesterday, trigger rate varies between 2-3 Hz, which is lower than that at start of previous data acquisitions, but higher than 1 Hz when we had a problem.
2210 Take advantage of detector flash to fill N2 cold trap full.