| | Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 →gender changer 3/1/2 → HVConn 1/3/2 → HV 1/2 → DCRC55/DCRC33 |
| 1203 | Start LHe transfer (MB = 25.5%) |
| 1208 | Fill LN2 cold trap |
| 1209 | Tower/MC/Coldplate = 32.5/30.5/192 mK, Still = 1.4 K / 0.110 mbar, G1/G2 = 226/200 mbar, 1K Pot = 1.666 K / 24 mbar. Main Bath = 25.5%. Boil off rate: a bit faster than slow mode (predicted level: 27.8%) |
| 1242 | dialed voltage down to zero |
| 1244 | checked last data series (07170429_1112) and pulses look good still! |
| 1252 | shorted voltage to set zero volts by definition |
| 1253 | begin 1 hr bake |
| 1257 | bake is coming to steady state at MC temperature around 475 mK |
| 1259 | Finish LHe transfer (MB = 92.0%) |
| 1418 | begin dialing up voltage again to 65 V for prebias |
| 1425 | set at 25V (took a while because I first put the black voltage line into the “ground” plug on the power supply, instead of “-”) |
| 1432 | end prebias and set to 50 V nominal |
| 1441 | measured voltage across the test point, seemed to be monotonically increasing, even at the end when it was around 4.0 mV. Using that value I guess the true voltage is 48.24 V, but it troubles me that the value never seemed to settle, and I was over 10 minutes out from setting the 50V nominal voltage |
| 1459 | had to change a bunch of driver offsets to get channels back, they seem to be OK now, try to start a sequence |
| 1500 | base temperature back to around 32.5 mK |
| 1500 | Start 21 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (20/20/5)/(3/5/2), OG = 4/2, QET biases = QET biases = table from Apr 28, with 1000 beginning randoms, no flashing, and a 1500ADC bin threshold trigger on DCRC4 pA (TTL signal) Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold |
| 1505 | data looks good in BatViewer |