2019/11/09 (Saturday)
| Setup | DIB1/2/4 → 3.2 MHz filters → cable 1/2/3 → gender changer 1/2/3 → movable source controller/board with external Feedback resistor/nothing → DCRC55(1)/DCRC33(2)/DCRC50(3) |
|---|---|
| 0935 | Fill LN2 cold trap full. |
| 0945 | Begin LHe transfer MB=28.5% |
| 1040 | Main Bath level was falling for abnormally long time at beginning of transfer, is rising now |
| 1105 | End LHe transfer MB=95.1% |
| 1630 | Start -/+ bias scan of 30 min Bkg data series with S1/S2 = 0/0,-/+4,-/+8,-/+12 V with edited phonon settings, Driver gain = 1, with 1000 initial randoms, followed by 30s flash trigger on DCRC2pA/B/C/D = 8/8/8/8 ADC using sequence qbias_scan_r71_mp_0_4_8_12.msl |
| 1800 | The tower temp rose to 48 mK and 53 mK during the 8V and 12V series for some reason. |
looks like 20 minutes after the 8V series started, there was breakdown in DCRC1 charge. For all of the 12V series there was breakdown in DCRC1 charge.
note: at 0/0 V there were significant charge pulses. So it probably was not really at 0V. (On Nov 12 we realized that MIDAS was messed up and sending the wrong bias to DCRC1 - this could be the first indication of the problem, which may have begun when the DAQ programs were restarted on Nov 7.)