2017/03/15 (Wednesday)
| 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 | |
| 0915 | Tower = 33.2 mK, Main Bath = 33.8%. Boil off rate: faster than slow mode (predicted level: 37.5%). |
| 0920 | Fill LN2 cold trap bath. |
| 1040 | Finish IbIs on DCRC2pD |
| channel | QET bias | prefactor | QETbias*prefactor | Selected QETbias*prefactor | New QET bias |
|---|---|---|---|---|---|
| DCRC1pA/DIB1pA/Side1pE | 127 | 0.2129 | 27.04 | 40 | 130.2 |
| DCRC1pB/DIB1pB/Side1pB | 150 | 0.3514 | 52.71 | 40 | 143.4 |
| DCRC1pC/DIB1pC/Side1pD | 130 | 0.3014 | 39.18 | 40 | 130.4 |
| DCRC2pC/DIB4pC/Side1pC | -150 | 0.1611 | 24.16 | 40 | -156.1 |
| DCRC2pD/DIB4pD/Side1pF | -150 | 0.2929 | 43.93 | 40 | -148.6 |
DCRC2pD was already close to prefactor*QETbias = 40 μA. Another small adjustment brings all 5 channels to 40 μA.
| 1526 | Start LHe transfer at MB=24.9% |
|---|---|
| 1602 | End LHe transfer at MB=70.8% During the transfer we used 2.75 PSI to pressurize the 250L Dewar, which was low, and the recovery rate during transfer was around 8.8 cuft/min. After the LHe ran out (fell below the transfer stick), the recovery meter rate increased to about 14 cuft/min. |
| 1700 | DCRC2 PC and PD railed change their Driver offsets from PC/PD = -0.2/-0.05 to 1.63/1.17 |
| 1704 | Start sequence of 12, 1-hour data series of 1-sided 0V HV data with Frontend Gain = (20/20/20)/(-/4/3), OG = 4/2, QET biases = table above, with 1000 beginning randoms, no flashing, and a 15ADC bin threshold trigger on DCRC1 pA |
| 1710 | Commence 3V background series with HPGe crystal. |
| 1712 | Fill LN2 cold trap. |