2016/12/13 (Tuesday)
| Setup: DIB1/3/4 → 3.2 MHz filters → cables 1,2,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3) | |
| 0845 | Main bath = 37.2% |
| 0850 | This morning all channels look OK at their standard QET biases except DCRC3pC, at 165 uA it seems unstable, but at 166 uA it's ok. |
| 0905 | Finish microIbIs measurement at 0V. Vbias values are lower than yesterday morning at 0V by 45 mV on average, range 0-88 mV |
| 1054 | Dial HV up to 115 V for prebiasing. Over 5 minutes Vtest falls from around 50 mV to around 25 mV. Breakdown noise evident but pulses still present. |
| 1101 | Dial HV down to 100 V A lot of breakdown noise. Pulses look ok in all channels except DCRC3pC. |
| 1105 | Zap SQUIDs |
| 1110 | Pulse shapes look much better after zap. All channels operating well at standard QET biases (DCRC1pA/B/C/DCRC3pC/D = 182/185/185/165/202 uA). DCRC3pC looks like maybe the least noisy channel, will trigger on that one |
| 1120 | HV = 100.0 V, Vtest = 12.5 V |
| 1122 | Start a sequence 1-hour series of 100V data with Frontend Gain = 5, OG = 2, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 10ADC bin threshold trigger on DCRC3 pC. |
| 1130 | Threshold seems too low, adjust DCRC3pC threshold from 10 to 15 ADCbins |
| 1139 | Threshold seems too low, adjust DCRC3pC threshold from 15 to 18 ADCbins |
| 1153 | Threshold OK but maybe a little higher would be better, adjust DCRC3pC threshold from 18 to 20 ADCbins |
| 1200 | Tower/MC/Coldplate = 33.1/36.0/200 mK, Still = 1.04 K / 110 μbar, G1/G2 = 191/171 mbar, 1K Pot = 1.68 K / 22 mbar. MB = 32.2%. Boil off rate: slow mode! |
| 1417 | Stop data |
| 1420 | Start LHe transfer (27.7%) |
| 1435 | Finish microIbIs at 100V. Vbias values are on average 163 mV higher than at 0V this morning, range 57-224 mV |
| 1435 | HV = 100.0 V, Vtest = 11.5 V |
| 1440 | Dial HV down to 0V |
| 1445 | Vtest was around -70 mV after dial-down, has been decreasing, now down to -5 mV and still falling slowly |
| 1500 | Finish LHe transfer (92.0%) |
| 1500 | Finish microIbIs measurement at 0V. Some of the Vbias values are higher, some lower than at 0V this morning, range from 23 mV higher to -47 mV lower |
| 1505 | All channels are back at their standard QET biases and showing pulses. Driver gains are at 2x, probably would want to increase to 8x for any 0V data taking |
| 1545 | Flash detector for 30 s |
| 1602 | Release MB pressure. |
| 1702 | Fill LN2 cold trap full. |
| 1730 | Bring out 22Na source. |
| 2018 | Set up 22Na coincident trigger, want to run tomorrow from morning till 1pm when the PuBe source comes |
| 2109 | just after zap script DCRC2 seemed to spontaneously turn back to RevC.1 |
| 2125 | Start 60V HV sequence of 10 1-hour series data with 75V, 5min prebias x2 driver gain, Triggering externally on NaI detector with 22Na source, hoping to see coincidences. |