2022/09/19 (Monday)
- Lab in-personnel: Matt
| Status | Run 76 in progress |
|---|---|
| Setup | Cables 2/3/1 → diverter/nothing/nothing → Side2-readout HV CONN 1/3/2 → HV 1(L)/2(R) → DCRC50(3)/DCRC55(1), DCRC33(2)→HV control, NaI trigger signal → DCRCX(4) Lead/poly shield fully assembled. Boron-filled socks covering NaI detectors. PuBe behind lead wall on West side of lead/poly shield. |
| NaI trigger window: 7.6-11.2 MeV | |
| Eighth 5K pumpout yesterday. Pumping IVC overnight, circulation and 1K Pot suspended. | |
| 0925 | MC/1KPot/Sorb = 5.40/5.78/7.30 K. G1(fridge) = 540 mbar |
| 0925 | Turbo on IVC = 1.4 nbar. With Turbo valved out for 1 minute IVC = 12 nbar. |
| 0925 | Close IVC valves on top of fridge |
| 0930 | Turn on 4He pump. Open Recovery valve to 4He pump. Pump out line to 1K pot (speedivalve closed).Check pressure in 1K Pot (with V4a open, 4He pump inlet valve closed). 1K Pot = 0.24 bar on mechanical gauge. |
| 0930 | Pump out 1K Pot in stages, alternating 1K Pot Speedivalve and V4a, opening V4a in brief spurts to keep 4He pump pressure low (below 5 mbar). |
| 0935 | Start pumping 1K Pot continuously |
| 0940 | MC/1KPot/Sorb = 5.38/3.33/4.20 K. |
| 1005 | MC/1KPot/Sorb = 3.34/3.05/4.00 K. G1(fridge) = 412 mbar |
| 1015 | 1K Pot = 0° / 2.93 K / 2.6 mbar |
| 1015 | Open 1K Pot needle valve → 15°. 1K Pot → 2.65 K / 6.5 mbar |
| 1030 | MC/1KPot = 3.07/2.43 K. G1(fridge) = 285 mbar |
| 1030 | Open 1K Pot needle valve → 30°. 1K Pot → 2.33 K / 8.0 mbar |
| 1040 | MC/1KPot = 2.89/2.12 K. G1(fridge) = 222 mbar |
| 1040 | Open 1K Pot needle valve → 45°. 1K Pot → 1.92 K / 13 mbar |
| 1105 | Connection to cdms1.spa.umn.edu is working again. Restart MIDAS. Looks like LazyLogger is copying leftover raw files from /midasraw/livedata to /midasraw/byseries, finishing up from the DAQ crash a couple days ago. |
| 1110 | MC = 2.18 K. G1(fridge) = 60 mbar. These are both flattening. |
| 1115 | 1K Pot = 1.54 K / 7.5 mbar, kinda low. We'll see how it does when we start circulation |
| 1120 | MC drops relatively quickly from 2.16 to 2.07 K, I guess it pushed through the lambda point. |
| 1155 | MC/1KPot = 1.88/1.59 K. G1(fridge) = 45 mbar, still falling slowly |
| 1155 | 1K Pot = 1.59 K / 13±1 mbar, this looks better. |
| 1230 | MC = 1.78 K. G1(fridge) = 37 mbar |
| 1230 | Close V3 and V9, leaving 35 mbar mixture in dump |
| 1230 | Turn on 3He pump |
| 1235 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 225 mbar. MC(H35) → 1.47 K. Still → 1.52 K / 50 mbar. |
| 1240 | Fill LN2 cold trap bath |
| 1245 | V6 → 13.0%. Condenser(G1) peaks at 240 mbar. MC(H35) → 1.32 K. Still(P1) → 1.35 K / 13 mbar. |
| 1250 | V6 → 13.4%. Condenser(G1) peaks at 230 mbar. MC(H35) → 1.10 K. Still(P1) → 1.20 K / 3.8 mbar. |
| 1300 | V6 → 13.8%. Condenser(G1) peaks at 196 mbar. MC(H35) → 0.55 K. Still(P1) → 1.17 K / 2.02 mbar. |
| 1320 | V6 → 14.4%. Condenser(G1) peaks at 203 mbar. MC(H35) → 0.40 K. Still(P1) → 1.15 K / 0.95 mbar. |
| 1330 | V6 → 15.0%. Condenser(G1) peaks at 199 mbar. MC(H35) → 0.20 K. Still(P1) → 1.17 K / 0.45 mbar. |
| 1345 | V6 → 100%. Condenser(G1) peaks at 192 mbar. MC(H35) → 96 mK. Still(P1) → 1.10 K / 0.13 mbar. |
| 1420 | MC = 30.0 mK. Condenser(G1) = 143 mbar. Still = 0.075 mbar. |
| 1425 | Open V14 to pull the rest of the mixture out of the dump into circulation. MC peaks at 60 mK, Still peaks at 26 mbar, Condenser peaks at 198 mbar, then all relax again. 1K Pot unaffected. |
| 1450 | Still = 0.6 mbar. Close V14 |
| 1510 | MC = 28.0 mK |
| 1515 | Plug in DCRCs 1&3 |
| 1520 | Check phonon channels. They look good. Baselines still near -0.8 V except DCRC3pA - after a relock DCRC3pA is near -0.8 V too. |
| 1605 | MC = 29.1 mK. Seems to have settled here after turning on the DCRCs. |
| 1700 | Enable DCRC2 for HV control. But I forgot to set the ODB for 0V after manually dialing down the HV yesterday when the DAQ was inaccessible. So it jumped to -88V. Set the DCRC2qI back to 11.59 to get the HV back to nominally 0V. We'll let it settle. |
| 1709 | Dial HV up to -109.25V nominal, -107.2V actual, for 15% prebias (using RootSequencer) |
| 1714 | Dial HV down to -95V nominal, -92.9V actual |
| 1717 | HV = -92.9 V, Vtest = -23.4 mV, Ileak = -25.7 uA, Vdet = -82.6 V (89%). A little below 90% at the detector. Let's step it down a bit. |
| 1718 | Dial HV down to -90V nominal, -88.0V actual |
| 1720 | HV = -88 V, Vtest = -17.6 mV, Ileak = -19.3 uA, Vdet = -80.3 V (91%). |
| 1723 | Start -80.3 V PuBe data series 44 min long, SiHV-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| QET baselines seem more elevated than usual. Pulses look OK. | |
| 1730 | MB = 69.0% |
| 1808 | Start -80.6 V PuBe data series 4 good min long, NaI-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20. Start series with the Start Button |
| 1810 | HV = -88 V, Vtest = -16.9 mV, Ileak = -18.6 uA, Vdet = -80.6 V (92%). |
| TowerFE crash just 4 minutes into the data series | |
| 2012 | Start -80.7 V PuBe data series 111 good min long, NaI-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20. Start series with the Start Button |
| 2015 | HV = -88 V, Vtest = -16.5 mV, Ileak = -18.2 uA, Vdet = -80.7 V (92%). |
| Dump 111 is the last non-empty dump. Not sure what happened this time, some kind of crash. |