| 0030 | Start data acquisition with Ba-133 source 6“ below top of mu-metal shield, 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, +/-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. |
| | Phonon pulses look fine. I think timing link is up, but it is a little difficult to tell. No clear signs of noise in the phonon channels, so am guessing that it should be up. Trigger rate around 3-4 Hz during test data series. A little lower than expected - presence of Ba-133 source should have resulted in a higher trigger rate. Having said that, perhaps such a conclusion would be incorrect. Carry on - see what it looks like later today. |
| 0240 | Take advantage of detector flash and cool down to fill N2 cold trap full. |
| | Unplug turbo pump from wall: it may not make a difference, but it won't do any harm. |
| 1010 | Fed Cricket 3 pellets. |
| 1715 | Filled LN2 cold trap. |
| 1735 | Begin LHe transfer (26.1%). |
| 1815 | Cease helium transfer. Helium liquid level 92.1%. |
| 1825 | Fed Cricket 4 pellets. |