2017/04/25 (Tuesday)
| 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 | |
| Stronger 88Y source is out, hanging from a string on the left side (south side) of the fridge by the wall, just above the fridge hoist crank. | |
| 0900 | Tower = 33.0 mK, Main Bath = 30.9% |
| 0905 | Fill LN2 cold trap bath |
| 1108 | Begin LHe transfer @ MB = 27.% |
| 1149 | Cease LHe transfer @ MB = 92.1% |
| 1231 | Let's take some HV data. Here is the most recent comprehensive set of balanced QET biases. They were calculated based on 0V IbIs curves. |
| Most Recent Set of standardized QET biases for HV mode: | |||
|---|---|---|---|
| channel | QET bias | QETbias*prefactor | Date |
| DCRC1pA/DIB1pA/Side1pE | 132.9 | 40 | 04/11 |
| DCRC1pB/DIB1pB/Side1pB | 145.3 | 40 | 04/11 |
| DCRC1pC/DIB1pC/Side1pD | 130.4 | 40 | 04/11 |
| DCRC2pB/DIB3pC/Side1pA | -121.17 | 40 | 04/19 |
| DCRC2pC/DIB4pC/Side1pC | -152.8 | 40 | 04/11 |
| DCRC2pD/DIB4pD/Side1pF | -151.7 | 40 | 04/11 |
| 1233 | Set HV = 65 V |
|---|---|
| 1235 | Set QET biases as per above table. |
| 1249 | Reduce to HV = 50 V |
| 1253 | Start 1, 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 = table above, with 10000 beginning randoms, no flashing, and a 1500ADC bin threshold trigger on DCRC4 pA (TTL signal) Running a single NaI detector with Y-88 suspended 1m from south shield wall. |
| 1724 | Fill LN2 cold trap full. |