| | Setup: DIB1/3/4 → SL 27/19/20 → 3.2 MHz filters → cables 2,1,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3). DCRC4 → HV power supply. PuBe source present. |
| 0840 | Tower/MC/Coldplate = 21.4/24.7/153 mK, Still = 1.4 K / 0.100 mbar, G1/G2 = 245/227 mbar, 1K Pot = 1.61 K / 22 mbar, MB = 32.1% |
| 0840 | Tweak 1K Pot Needle Valve open a little further |
| 0845 | Fill LN2 cold trap bath. Small response, 1K Pot → 1.62 K / 26 mbar |
| 0850 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 0907 | Remove PuBe source from lab and move it to storage container in PAN 443 |
| 0915 | HV = 69.86 V, V_leak = 2.99 mV |
| 0920 | Adjust driver offset on DCRC3pB. Note: 0.1 change in Driver Offset = -0.4 V change in baseline. Other channels look good. |
| 0925 | Estimate event rate from random traces. Set PhononWaveformLength on DCRC1 to 131072 which is 52.4288 ms and counted visible pulses in 66 pA traces. Counted 109 pulses in 3.4603 seconds, so event rate is around 31.5 ± 3 Hz. |
| 0929 | Start 62-minute background data series at HV = 70V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 1000 initial randoms, trigger on DCRC1pB (Side1pB) threshold = 12 |
| 0930 | HV = 69.89 V, V_leak = 2.85 mV |
| 1031 | Stop data series |
| 1034 | Start 62-minute background data series at HV = 70V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 1000 initial randoms, trigger on DCRC3pD (Side1pF) threshold = 14 |
| 1136 | Stop data series |
| 1144 | Start LHe transfer (MB = 27.1%) |
| 1150 | Dial HV from 70 V down to 0 V using changeHV_70_0.msl |
| 1224 | Bring PuBe source back into lab and place behind shield |
| 1405 | Flash detector for 30s. |
| 1503 | Remove PuBe source from lab and move it to storage container in PAN 443 |
| 1512 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 1520 | All 6 channels still have appropriate offsets! |
| 1521 | Start 60-minute background data series at HV = 70V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 1000 initial randoms, trigger on DCRC3pD (Side1pF) threshold = 14 |
| 1522 | HV = 69.85 V, V_leak = 3.09 mV |
| 1542 | HV = 69.85 V, V_leak = 2.81 mV |
| 1619 | HV = 69.85 V, V_leak = 2.64 mV |
| 1621 | Stop data series |
| 1629 | Bring PuBe source back into lab and place behind shield |
| 1631 | Dial HV from 70 V down to 0 V using changeHV_70_0.msl |
| 1700 | Place Gd bottle between NaI detectors on meter stick. |
| 1800 | Fill LN2 cold trap full. |