| | 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 ok |
| 0855 | Tower = 33.1 mK, main bath = 36.1% |
| 0855 | HV = 49.99 V, Vtest = 5.0 mV → Vdetector = 47.8 V |
| 0900 | Fill LN2 cold trap bath. |
| 0909 | Start 1 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/4)/(3/5/2), OG = 4/2, QET biases = table from Apr 28, with 1000 beginning randoms, no flashing, and a 6ADC bin threshold trigger on DCRC1 pA (Side1 pE). 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 |
| 1125 | Dial HV down to 0 V |
| 1135 | Begin 30 minute bake on DCRCs 1&2 |
| 1248 | Start LHe transfer (MB = 30.0%) |
| 1250 | Tower/MC/Coldplate = 33.8/31.3/194 mK, Still = 1.3 K / 0.110 mbar, G1/G2 = 236/221 mbar, 1K Pot = 1.684 K / 28 mbar. Main Bath = 30.0%. Boil off rate: slow mode (predicted level: 30.1%) |
| 1350 | Noticed that on DCRC2pD the oscillatory noise around 10kHz may actually get better when the front-end gain is increased from 2 back to 4 (an older setting). Of course there's more noise above 100kHz at the higher front-end gain but that's not as much of a problem. We'll try running that way. |
| 1440 | Transfer is going very slowly for unknown reasons. But the level is going up at a constant rate. According to this rate it will finish around 15:30, almost 3 hours total. Maybe the transfer stick is partially blocked. |
| 1528 | Finish LHe transfer @ MB = 90.7% |
| 1530 | Dial HV up to 65 V. After 5 minutes dial HV down to 50.00 V. |
| 1545 | HV = 50.00 V, Vtest = 3.0 mV → Vdetector = 48.7 V |
| 1547 | Start 1 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/10)/(4/5/4), OG = 4/2, QET biases = table from Apr 28, with 1000 beginning randoms, no flashing, and a 6ADC bin threshold trigger on DCRC1 pA (Side1 pE). 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 |
| 1650 | HV = 50.00 V, Vtest = 2.0 mV → Vdetector = 49.1 V |
| 1650 | Start 17 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/10)/(4/5/4), OG = 4/2, QET biases = table from Apr 28, with 1000 beginning randoms, no flashing, and a 6ADC 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 |
| 1700 | Fill LN2 cold trap bath |