| | 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. |
| 0910 | Tower = 32.8 mK, Main bath = 31.2% |
| 0910 | HV = 50.02 V, Vtest = 1.5 mV. Vdetector = 49.4 V |
| 0925 | 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 22ADC bin threshold trigger on DCRC2 pD (Side1 pF). 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 |
| 1049 | Tower/MC/Coldplate = 32.9/30.6/189 mK, Still = 1.3 K / 0.110 mbar, G1/G2 = 235/217 mbar, 1K Pot = 1.692 K / 28 mbar. Main Bath = 28.6%. Boil off rate: slow mode (predicted level: 28.6%! ) |
| 1105 | Dial HV down to 0V. Start 30 minute bake on DCRCs 1&2. |
| 1110 | Start LHe transfer (MB = 28.2%) |
| 1201 | Fill LN2 cold trap bath. |
| 1236 | End LHe transfer (MB = 94.2%) |
| 1250 | Dial HV up to 65 V. After 5 minutes dial down to 50 V. |
| 1255 | Checked all 6 channels, all look good. |
| 1436 | 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 22ADC bin threshold trigger on DCRC2 pD (Side1 pF). 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 |
| 1440 | HV = 49.99 V, Vtest = 2.8 mV. so Vdetector = 48.8 V. |
| 1445 | Notice DCRC1pB is railed. Abort series. |
| 1455 | Can't get DCRC1pB back. Try zapping the SQUID on DCRC1pB. |
| 1505 | After zapping, all DCRC1 channels railed, but all could be restored. However pA needs an unusually high driver offset, and pB's pulses look distorted, plus it seems to have some oscillations. |
| 1520 | Power cycle DCRC1. Zap all DCRC1 channels. |
| 1600 | All channels seem to be OK now. |
| 1602 | Start 1 1-hour data series of 1-sided 50V HV coincidence 255data 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 22ADC bin threshold trigger on DCRC2 pD (Side1 pF). 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 |
| 1612 | Looks like too many trigger, DCRC2pD has some wiggly noise. Increase threshold from 22 to 30. |
| 1714 | 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 |
| 1728 | Fill LN2 cold trap full. |