| | 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. |
| 0550 | HV = 69.87 V, V_leak = 2.40 mV |
| 0550 | Tower = 21.5 mK |
| 0550 | Dial HV bias down to 0 V using changeHV_70_0.msl |
| 0600 | Flash detector with DCRC1,3 LEDs for 30 s |
| 0700 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 0720 | HV = 69.86 V, V_leak = 2.61 mV |
| 0720 | Tower = 21.5 mK |
| | let's do a short series to unrail DCRC3pB |
| 0723 | Start 17-minute background data series at HV = 70V, Driver Gains = 2x, QET biases = (-500/360/440)/(-480/380/-490) uA, Front-End Gains = 10/5 on DCRC1/3, 1000 initial randoms, trigger on DCRC3pC threshold 13. |
| 0732 | Adjust DCRC3pB D.O. from 0.15 to 0.5 |
| 0740 | Start sequence of 4 60-minute background data series at HV = 70V, Driver Gains = 2x, QET biases = (-500/360/440)/(-480/380/-490) uA, Front-End Gains = 10/5 on DCRC1/3, 1000 initial randoms, trigger on DCRC3pC threshold 13. |
| 1722 | Tower/MC/Coldplate = 21.5/25.2/150 mK, Still = 1.2 K / 0.100 mbar, G1/G2 = 240/220 mbar, 1K Pot = 1.62 K / 26 mbar, MB = 59.1% |
| 1725 | Fill LN2 cold trap bath. |
| 1726 | Dial HV bias down to 0 V using changeHV_70_0.msl |
| 1731 | Flash detector with DCRC1,3 LEDs for 30 s |
| 1835 | Let's take a little data with a channel superconducting to try and get a hold on the Johnson noise at 0V. |
| 1836 | Set DCRC1PA QET bias to 0 and DCRC1 phonon trace length to 32768 (13.1072 ms) |
| 2042 | Start 5 min SC data series at HV=0V, Driver Gains = 2x, QET biases = (0/360/440)/(-480/380/-490) uA, Front-End Gains = 10/5 on DCRC1/3, DCRC1 trace length = 13.1072ms, Trigger on 20Hz randoms |
| 2049 | It may be illuminating to see what the SC noise is at bias as well. If the HV-related noise is really coming in though the TES, then I think SC noise should be the same at 0V and bias. |
| 2051 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 2107 | HV = 69.88 V, V_leak = 2.83 mV |
| 2108 | Start 5 min SC data series at HV=70V, Driver Gains = 2x, QET biases = (0/360/440)/(-480/380/-490) uA, Front-End Gains = 10/5 on DCRC1/3, DCRC1 trace length = 13.1072ms, Trigger on 20Hz randoms |
| 2119 | Hrm, having the trace lengths different on DCRC1,3 may be causing trouble for the processing. Let's redo these with DCRC3 trace lengths long too. |
| 2114 | Start 5 min SC data series at HV=70V, Driver Gains = 2x, QET biases = (0/360/440)/(-480/380/-490) uA, Front-End Gains = 10/5 on DCRC1/3, DCRC1,3 trace length = 13.1072ms, Trigger on 20Hz randoms |
| 2120 | Dial HV bias down to 0 V using changeHV_70_0.msl |
| 2307 | Start 5 min SC data series at HV=0V, Driver Gains = 2x, QET biases = (0/360/440)/(-480/380/-490) uA, Front-End Gains = 10/5 on DCRC1/3, DCRC1,3 trace length = 13.1072ms, Trigger on 20Hz randoms |
| 2330 | Restore DCRC1PA QET bias = -500 uA |