2017/12/27 (Wednesday)
| 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. | |
| 1010 | Tower/MC/Coldplate = 21.6/25.5/150 mK, Still = 1.2 K / 0.100 mbar, G1/G2 = 213/172 mbar, 1K Pot = 1.62 K / 26 mbar, MB = 38.3% |
| currently finishing final data series of yesterday's sequence | |
| 1010 | HV = -69.77 V, V_leak = -3.23 V. |
| 1015 | Fill LN2 cold trap bath |
| 1532 | Begin LHe transfer @ MB = 30.1% |
| 1608 | End LHe transfer @ MB = 61.1% (Dewar ran out) |
| We'll do another long sequence, but this time add in-series randoms. The noise characteristics change with time since biasing, so beginning-of-series randoms aren't so good for assessing the noise threshold. | |
| 1645 | Switch HV leads back to positive-bias HV. |
| 1645 | Looks like MIDAS is down for some reason… restart MIDAS. I also changed ODB/Programs/triggerfe2/Start_command to point at triggerfe2_mod.exe, the trigger front-end modified to not throw out the first event in a pileup |
| 1655 | Start sequence of 12 30-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 and 5Hz in-series randoms, trigger on DCRC3pC threshold = 11, flashing then waiting 30min after each series, using modified triggerfe, using sequencer script DataLoop_70V_30min_groundflash_30min |
| First data sequence started at |
|
| 1710 | HV = 69.79 V, V_leak = 3.75 mV (V_leak is higher than usual) |
| 1715 | Fill LN2 cold trap bath |
| 1825 | Oops, Write Data was off in ODB/Logger. Just now turned it on. |
| 1940 | HV = 69.80 V, V_leak = 3.12 mV. Tower = 21.6 mK |