2019/06/25 (Tuesday)
| 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. |
|---|---|
| 0510 | 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 = (490/400/490)/(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 |
| 0850 | Fill LN2 cold trap bath |
| 0924 | Tower/MC/Coldplate = 40.3/30.8/200 mK, Still = 1.28 K / 0.09 mbar, G1/G2 = 152.6/152.5 mbar, 1K Pot = 1.61 K / 20 mbar. MB = 65.1% |
| 0930 | 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 = (490/400/490)/(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 |
| 1307 | Apply 5 mW of heat to Still heater. We'll see if base temperature improves. |
| 1310 | Still pressure: 0.09 → 0.17 mbar. Tower: initially rises 40.4→42.9 mK, then starts falling. Also circulation pressures G1/G2 increased, 150→215 mbar |
| 1315 | Tower = 39.0 mK and falling |
| 1340 | Tower roughly settling at 38.8mK |
| 1350 | Apply 10 mW of heat to Still heater. We'll see if base temperature improves. |
| 1355 | Still pressure: 0.17 → 0.23 mbar. Tower: initially rises 38.8→40.2 mK, then starts falling. Also circulation pressures G1/G2 increased, 215→260 mbar |
| 1445 | Tower roughly settling at 39.5mK. Circulation pressure rose too 300mbar |
| 1450 | Apply 8 mW of heat to Still heater. We'll see if base temperature improves. |
| 1500 | Still pressure: 0.23 → 0.20 mbar. Tower 39.5→40 mK then starts fallin Also circulation pressures G1/G2 decreased, 300→290 mbar |
| 1515 | Tower roughly settling at 39.7mK. Apply 6 mW of heat to Still heater |
| 1520 | Fill LN2 Cold Trap Bath |
| 1600 | Tower is at 39.2mK but looks to be falling still circulation pressures decreased to about 250mbar still pressure seems to be fluctuating between 0.17 and 0.2mbar |