2019/06/16 (Sunday)
| Setup | DIB1/3/4 → 3.2 MHz filters 2/3/1 → cable 3/1/2 → gender changer ?/3/2 → HVConn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1) DCRC33(2) → 1kV power supply → HV input Three walls of the lead/poly shield are up. |
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| 0510 | Feed cat breakfast. Birds woke her up. |
| 0513 | Start a 90 min series at HV = 180→400V, rate 2.418V/min with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 6/6/6. Use sequence HVdrift_180V_cal0612_2p418VPM_prebias_10_2_dur_90min_flashDCRC_1_4.msl |
| Around 07:30, fridge computer rebooted - I guess? It was a little strange because I didn't have to log in, but LabVIEW and everything else was off. This was with Remote Desktop. | |
| 0839 | Start a 90 min series at HV = 180→400V, rate 2.418V/min with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 6/6/6. Use sequence HVdrift_180V_cal0612_2p418VPM_prebias_10_2_dur_90min_flashDCRC_1_4.msl |
| 1115 | Start a 90 min series at HV = 180→400V, rate 2.418V/min with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 6/6/6. Use sequence HVdrift_180V_cal0612_2p418VPM_prebias_10_2_dur_90min_flashDCRC_1_4.msl |
| 1328 | Partially fill LN2 cold trap bath. LN2 dewar runs dry. |
| 1330 | Tower/MC/Coldplate = 47.6/33.7/199 mK, Still = 1.3 K / 0.095 mbar, G1/G2 = 150/146 mbar, 1K Pot = 1.63 K / 22 mbar. MB = 26.0% All measurements taken after a recent flash. |
| 1340 | Jiajin has not been responding to keyboard/mouse, though sshing to it works. Restart jiajin. |
| 1355 | Commence LHe transfer. MB=26.0% |
| 1440 | Cease LHe transfer. MB=92.0% |
| 1529 | Start a 90 min series at HV = 180→400V, rate 2.418V/min with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 6/6/6. Use sequence HVdrift_180V_cal0612_2p418VPM_prebias_10_2_dur_90min_flashDCRC_1_4.msl |
| 1838 | Start a 90 min series at HV = 180→400V, rate 2.418V/min with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 6/6/6. Use sequence HVdrift_180V_cal0612_2p418VPM_prebias_10_2_dur_90min_flashDCRC_1_4.msl |
| Note: the HV current leakage of the last two data series is noticeably worse than earlier series. In earlier runs the leakage went 2.5→6 mV; in the next-to-last one it was 3→8 mV, and the last one was 5→11 mV. This is a clear effect of the LN2 running out, so the Ebox purge has stopped. This is not a severe effect on the effective HV - less than a 1% difference. But I'll stop taking data for now rather than let it get worse, we'll wait until we get the purge going again. |