2017/12/21 (Thursday)
| 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. | |
| 0525 | Zap SQUIDS on DCRCs 1,3 twice, standard settings |
| 0540 | Flash detector for 30 s with DCRCs 1,3 LEDs |
| 0605 | Dial HV up to 70V with 15% 5min prebias using changeHV_0_70_preBias15_5.msl |
| 0605 | Tower = 22.7 mK |
| quick test series to check offsets | |
| 0613 | Start 57-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, 2000 initial randoms, trigger on DCRC3pD (Side1pF) threshold = 14. |
| 0622 | Adjust DCRC1pA D.O. from -0.15 to 0.0 Adjust DCRC1pB D.O. from -0.2 to 0.0 Adjust DCRC3pC D.O. from -1.1 to -0.7 |
| 0630 | Adjust DCRC1pB D.O. from 0.0 to -0.3 Adjust DCRC3pB D.O. from -0.45 to -0.2 Adjust DCRC3pC D.O. from -0.7 to -0.6 |
| 0634 | Adjust DCRC1pB D.O. from -0.3 to -0.6 |
| 0639 | Adjust DCRC1pB D.O. from -0.6 to -0.9 |
| 0644 | Adjust DCRC1pB D.O. from -0.9 to -1.3 |
| 0651 | Adjust DCRC1pB D.O. from -1.3 to -1.5 |
| 0658 | Adjust DCRC3pB D.O. from -0.2 to -0.1 Adjust DCRC3pC D.O. from -0.6 to -0.5 |
| 0707 | Adjust DCRC3pB D.O. from -0.1 to 0.0 Adjust DCRC3pC D.O. from -0.5 to -0.45 |
| 0712 | Start sequence of 3 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, 2000 initial randoms, trigger on DCRC3pD (Side1pF) threshold = 14. |
| 1000 | Tower/MC/Coldplate = 21.6/25.6/158 mK, Still = 1.2 K / 0.100 mbar, G1/G2 = 232/209 mbar, 1K Pot = 1.62 K / 28 mbar, MB = 33.7% |
| 1005 | Fill LN2 cold trap bath |
| 1005 | HV = 69.91 V, V_leak = 2.45 mV |
| 1040 | Turn off triggerfe2 from MIDAS page. Start triggerfe2_mod.exe from command line |
| 1042 | Start sequence of 3 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, 2000 initial randoms, trigger on DCRC3pD (Side1pF) threshold = 14, using modified triggerfe |
| 1230 | HV = 69.90 V, V_leak = 2.47 mV |
| 1315 | HV = 69.90 V, V_leak = 2.49 mV |
| 1400 | Dial HV down to zero then flash with sequence changeHV_70_0_thenflash.msl |
| 1418 | Begin LHe transfer @ MB = 27.5% |
| 1445 | Change helium gas cylinder |
| 1459 | Finish LHe transfer @ MB = 91.3% |
| 1510 | Dial HV up to 70V with 15% 5min prebias using changeHV_0_70_preBias15_5.msl |
| Gonna take some standard data starting shortly after biasing after flash, to better compare with the warmed-tower data (which looked pretty good in terms of noise peak) | |
| 1525 | HV = 69.90 V, V_leak = 2.83 mV |
| 1525 | Start sequence of 2 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, 2000 initial randoms, trigger on DCRC3pD (Side1pF) threshold = 14, using modified triggerfe |
| 1527 | HV = 69.90 V, V_leak = 2.79 mV |
| 1545 | HV = 69.90 V, V_leak = 2.59 mV |
| 1630 | HV = 69.90 V, V_leak = 2.51 mV |
| 1635 | Fill LN2 cold trap bath crap, the hose busted. Something must have gotten clogged. Will have to deal with it tomorrow. |
| 1810 | Dial HV down to zero then flash with sequence changeHV_70_0_thenflash.msl |
| 1900 | Dial HV up to 70V with 15% 5min prebias using changeHV_0_70_preBias15_5.msl |
| Will take a sequence of short series for a couple hours to further study degradation after setting bias | |
| 1905 | Tower = 21.9 mK |
| 1910 | HV = 69.89 V, V_leak = 2.17 mV |
| 1912 | Start sequence of 12 10-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, using modified triggerfe |
| all channels look a-ok | |
| 1915 | HV = 69.89 V, V_leak = 2.72 mV |
| 1915 | Tower = 21.8 mK |
| 2125 | HV = 69.89 V, V_leak = 2.43 mV |
| 2135 | Dial HV down to zero then flash with sequence changeHV_70_0_thenflash.msl |