| | Current setup: DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50. Overnight, Cf source in shield activating detector, detector baking |
| 0936 | Fill LN2 cold trap full. With tower temperature at 260 mK, stop flasing detector. Temperature quickly drops to 80 mK and then continues dropping more slowly. |
| 0945 | Remove Cf-252 source from fridge. |
| 1009 | Tower down to 32 mK after 33 minutes |
| 1025 | Tower/MC(H35)/MC sensor/Cold Plate = 31.5/26.1/42.5/162 mK, Still = 1.42 K / 0.085 mbar, G1/G2 = 155 mbar, 1K Pot = 1.72 K / 24 mbar, Main bath = 26.9%. |
| | italicized temperatures from Fridge Out 1 cable are still elevated for some reason |
| 1300 | Check pB2 to see if it's flipped to upside down pulses overnight. It's still showing positive pulses. |
| 1302 | Power down DCRCs and install HV box with HV1=DCRC50, HV2=DCRC55. (ebox→cables→gender changer → 3.2MHz Pi filter → HV Box → DCRC |
| 1340 | 150Hz noise noticed after powering up DCRCs. |
| 1355 | Set SQUID settings from 2015/08/14 values and QET biases with values from 2015/08/17. |
| | Raise HV2pB's QET bias by 20uA in order to get good pulses (raise sensor from superconducting into transition region). Strange because the 2015/08/17 QET settings for HV2 already had a 10MHz filter in place when IbIs was taken. |
| 1430 | Commence LHe Transfer (18.4%). |
| 1510 | End LHe transfer (93.0%). |
| 1525 | Seeing very regular spikes on Qi. Frequency of 83Hz. Visible on Qo, but less severe. This phenomenon was seen before on 2015/08/17. Power cycling both DCRCs fixed the issue. |
| 1530 | Power cycle boards. |
| 1550 | Power DCRCs. Zap SQUIDs. Set SQUID/QET settings. 83Hz noise is gone. |
| 1615 | Attach voltage to HV jack and observe leakage current as a function of applied voltage. Trend follows that observed before. |
| 1625 | Place Cf source in shield near detector for overnight activation. |
| 1630 | Fill LN2 cold trap full. |
| 1645 | Set detector to bake overnight. |