| | 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) |
| | Took overnight data at HV=60 V. |
| 1435 | Tower/MC/Coldplate = 32.9/35.7/199 mK, Still = 1.06(!) K / 110 μbar, G1/G2 = 190/160 mbar, 1K Pot = 1.68 K / 24 mbar. MB = 58.7%. Boil off rate: a bit faster than slow mode. |
| 1440 | Fill LN2 cold trap bath. |
| 1440 | HV = 59.97 V, Vtest = 3.5 mV. So Vdetector = 58.4 V |
| 1455 | Finish microIbIs at 60V. All channels Vbias values are elevated compared to Dec 6 0V result, rangin from 29-67 mV elevation. “Breakdown noise” waveforms are apparent in all channels (less so in DCRC3pC). I wonder if it has gotten worse since yesterday - should look at noise PSDs during data taking. |
| 1500 | Dial HV down to 0 V |
| 1515 | Finish microIbIs at 0V. All Vbias values are lower than Dec6 0V, ranging 7-20 mV lower. |
| 1515 | Flash detector |
| 1520 | In ODB change DCRC1&3 trace lengths, ChargeWaveFormLength = 131072, PhononWaveFormLength = 65536 (for long-trace noise data). |
| 1529 | Start 60V HV long trace random data with 75V, 1min prebias and 26.2144ms trace length, x2 driver gain, 20Hz in-runrandoms with no starting/ending randoms. Start taking data, after 5 sec, begin increasing bias to 75 V over 90 seconds. After additional 1 minutes, reduce to operating bias of 60V. Take data for another 30 mins. |
| | Tower started at 36 mK and decreased to 33 mK during series |
| 1603 | Stop data |
| 1605 | Dial HV down to zero and flash detector |
| 1625 | Dial HV up to 90V. Breakdown noise evident initially but it seems to go away after a minute. Will leave it prebiased for 5 minutes. |
| 1630 | Dial HV down to 75.0 V. |
| 1635 | HV = 75.0 V, Vtest = 6.6 V so Vdetector = 72.1 V |
| 1635 | Start a sequence of 16 1-hour series of 75V data with Frontend Gain = 5, OG = 2, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 15ADC bin threshold trigger on DCRC3 pD. |
| 1635 | Tower = 33.4 V |
| 1725 | Few noise pulses showing up now, try reducing the threshold a bit. |
| 1725 | Adjust DCRC3pD trigger threshold down to 12 |
| 1740 | Main bath = 54.2% |
| 2119 | Notice DCRC3pC is railed low, adjust its ADCOffset from -.214 to -.514 V |
| 2135 | There seems to be a lag with copying data from /livedata to /byseries, so can't really check whether the channel is unrailed. |