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2012/10/23

0225 Fill N2 cold trap full.
0320 Change trigger definition to charge channels at threshold of 40 ADC bins. Start data acquisition. Flash for one hour, followed by cool down for 2 hours. Then take 3 hour-long data series at -/+3 V bias, followed by three 60-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.
Rate of data acquisition is around 4-5 Hz in test run, which is about half of that when triggering on phonons. Most of the pulses that are being recorded are of high energy and hence saturate. Hopefully this is due to the poly-lead shield. It could be due to a potential of 0 V across the detector.
1015 Fed Cricket 3 pellets.
1445 Began LHe transfer (3.7%).
1605 End helium transfer. Helium liquid level 84.1%.
2125 Fill N2 cold trap full.