| | 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. |
| 0710 | HV = 69.88 V, V_leak = 2.42 mV |
| 0710 | Tower = 21.5 mK |
| 0715 | Dial HV from 70 V down to 0 V using changeHV_70_0.msl |
| 0800 | Flash detector for 30 seconds with DCRC1,3 LEDs |
| 0905 | Tower/MC/Coldplate = 21.6/24.9/152 mK, Still = 1.2 K / 0.100 mbar, G1/G2 = 246/219 mbar, 1K Pot = 1.63 K / 28 mbar, MB = 65.3% |
| 0925 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 0935 | Estimate event rate from random traces. Set PhononWaveformLength on DCRC1 to 131072 which is 52.4288 ms and counted visible pulses in 60 pA traces. Counted 126 pulses in 3.1457 seconds, so event rate is around 40.1 ± 3.6 Hz. |
| 0940 | Dial HV from 70 V down to 0 V using changeHV_70_0.msl |
| 1038 | Bring PuBe source into lab and place it within the cryostat poly shield, lowered into shield in plastic cup at NW corner down to about detector level. |
| | after a few minutes Tower temperature rose from 21.4 to 21.6 mK |
| 1244 | Remove PuBe source from lab and move it to storage container in PAN 443 |
| | during removal the Tower temperature spiked to 31 mK then immediately began cooling to base |
| 1255 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 1310 | HV = 69.91 V, V_leak = 3.04 mV |
| 1310 | Tower = 21.5 mK |
| 1310 | Estimate event rate from random traces. Set PhononWaveformLength on DCRC1 to 131072 which is 52.4288 ms and counted visible pulses in 22 pA traces. Counted 117 pulses in 1.1534 seconds, so event rate is around 101.4 ± 9.4 Hz. |
| 1314 | Start 74-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 |
| | didn't bother to look at baselines, but it turns out they are OK |
| 1320 | HV = 69.92 V, V_leak = 2.85 mV |
| 1405 | HV = 69.91 V, V_leak = 2.59 mV |
| 1430 | HV = 69.92 V, V_leak = 2.60 mV |
| 1430 | Dial HV from 70 V down to 0 V using changeHV_70_0.msl |
| 1440 | Flash detector for 30 seconds with DCRC1,3 LEDs. |
| 1520 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 1530 | HV = 69.92 V, V_leak = 2.85 mV |
| 1530 | Tower = 21.7 mK |
| | We'll try taking a bunch of randoms data. The intent is to see whether the noise peak changes over time after neutralizing the detector. (note that this is also shortly after activation so that may confuse the result a bit - may want to repeat this after the short-lived stuff dies off a bit) |
| 1531 | 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, 1000 initial randoms, 20 Hz randoms. Using SimpleDataLoopNoFlash.msl |
| 1537 | DCRC3pD is railed, adjust D.O. from 0.45 to 0.2 to adjust it. |
| 1630 | Fill LN2 cold trap full |
| | How low can we trigger? We want to avoid the channels that go into oscillations: DCRC1pC and DCRC3pD, and we should avoid the channels with the weird behavior that when we trigger on them we get hardly any high-energy events. So that leaves DCRC1pA and DCRC3pC, both inner-ring segments. DCRC1pA seems to have lower noise, so lets try that one. |
| 1843 | Start 44-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 DCRC1pA threshold 12. |
| 1852 | Adjust DCRC1pB DCRC1pA D.O. from -0.7 to -1.0 in attempt to unrail it |
| 1912 | Oops, meant to adjust DCRC1pB. Return DCRCpA to -0.7. Adjust DCRC1pB D.O. from 0.02 to -0.3 in attempt to unrail it |
| 1915 | Tower = 21.5 mK |
| 1915 | HV = 69.90 V, V_leak = 2.49 mV |
| 1917 | Reduce trigger threshold from 12 to 10… so far looks like it's triggering on strong pulses |
| 1922 | Reduce trigger threshold from 10 to 8. Looks good. |
| 1928 | 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, 1000 initial randoms, trigger on DCRC1pA threshold 8. |
| 2130 | Tower = 21.5 mK |
| 2130 | HV = 69.91 V, V_leak = 2.42 mV |
| 2135 | Dial HV from 70 V down to 0 V using changeHV_70_0.msl |
| 2140 | Flash detector for 30 seconds with DCRC1,3 LEDs |
| 2220 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 2230 | Tower = 21.7 mK |
| 2230 | HV = 69.93 V, V_leak = 2.65 mV |
| | test with randoms again, will see whether noise peak degrades over time |
| 2232 | Start sequence of 7 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, 20 Hz randoms. Using SimpleDataLoopNoFlash.msl |