2019/06/26 (Wednesday)
| 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. |
|---|---|
| 0847 | Fill LN2 cold trap bath |
| 0925 | Tower/MC/Coldplate = 39.0/29.3/199 mK, Still = 1.38 K / 0.18 mbar / 6mW, G1/G2 = 231.6/217.6 mbar, 1K Pot = 1.62 K / 20 mbar. MB = 30.4% Note that now that we are heating the still, the Tower and MC temperatures are down a little, the Still pressure/temperature and circulation pressures are all higher. Tower temperature has improved by about 1.3 mK, not dramatic. |
| 1242 | Begin LHe transfer @ MB = 25.6% |
| 1321 | End LHe transfer @ MB = 92.2% |
| 1405 | Check phonon channels. DCRC4pC had stronger oscillations than before, probably because Tower is a little colder. Adjust QET bias 490→495 uA |
| 1414 | Start an 88 min series at HV = 180→400V, rate 2.49V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/495)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun randoms, trigger on DCRC1pB/C/D threshold = 7/7/7. Use sequence HVdrift_180V_cal0612_2p49VPM_prebias_10_2_dur_88min_flashDCRC_1_4.msl |
| 1556 | Fill LN2 cold trap bath |
| 1806 | Finished filling main LN2 dewar, restarted LN2 purge for leakage. All channels look ok, let's start another voltage run. Tower = 38.8 mK |
| 1811 | Start an 88 min series at HV = 180→400V, rate 2.49V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/495)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun randoms, trigger on DCRC1pB/C/D threshold = 7/7/7. Use sequence HVdrift_180V_cal0612_2p49VPM_prebias_10_2_dur_88min_flashDCRC_1_4.msl |
| 1812 | Voltage begins to rise, Leakage voltage still very low, less than 0.5 mV |
| 2114 | Start an 88 min series at HV = 180→400V, rate 2.49V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/495)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun randoms, trigger on DCRC1pB/C/D threshold = 7/7/7. Use sequence HVdrift_180V_cal0612_2p49VPM_prebias_10_2_dur_88min_flashDCRC_1_4.msl |