| | 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 |
| | PuBe source in paraffin barrel behind shield (west side) |
| | Took NaI-triggered data overnight @50V, looks good. |
| 1235 | Fill LN2 cold trap bath. |
| 1237 | Tower/MC/Coldplate = 32.9/30.7/198 mK, Still = 1.3 K / 0.110 mbar, G1/G2 = 228/210 mbar, 1K Pot = 1.687 K / 26 mbar. Main Bath = 26.3%. Boil off rate: close to slow mode (predicted level: 28.8%) |
| 1242 | Dial HV down to 0V. Start 30 minute bake on DCRCs 1&2. |
| 1257 | Start LHe transfer (MB = 25.8%) |
| 1411 | End LHe transfer (MB = 93.9%) |
| 1413 | Dial HV up to 65 V. After 5 minutes dial down to 50 V. |
| 1420 | Checked all 6 channels, all look good! |
| 1430 | HV = 50.01 V, Vtest = 2.1 mV. Vdetector = 49.09 V |
| 1434 | Start 19 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/4)/(4/3/2), OG = 4/2, 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. |
| 1436 | Fill LN2 cold trap bath. |