2022/11/11 (Friday)
- 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 W side of fridge. NaI scan in progress, not set up for coincidence data |
| Warmed up yesterday for twenty-second 5K pumpout. Turbo pumping IVC overnight. | |
| 1133 | Begin LHe transfer @ MB = 9.4% |
| 1140 | Fill LN2 cold trap bath |
| 1145 | Turbo on IVC = 0.86 nbar. With Turbo valved out for 1 minute IVC = 6.3 nbar. |
| 1145 | Close IVC valves at top of fridge. |
| 1150 | MB = 37.9% |
| 1150 | 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 = 0.39 bar on mechanical gauge. |
| 1150 | Pump out 1K Pot slowly, throttling the flow at the valve at the pump inlet, opening just until the pump gets louder, then waiting, then opening a little more, etc. With pump just a little loud, can see pressure go down at the mechanical gauge. When this is low, open valve a bit more. When P2 gets below 30 mbar open valve all the way. |
| 1155 | 4He pump valve open all the way. |
| 1155 | 1K Pot = 3.12 K / 4.0 mbar. G1 (fridge+dump)=419 mbar. MC = 5.70 K. |
| 1210 | 1K Pot = 2.99 K / 4.0 mbar. G1 (fridge+dump)=372 mbar. MC = 3.26 K. |
| 1223 | End LHe transfer @ MB = 94.6 % |
| 1250 | 1K Pot = 2.52 K / 4.0 mbar. G1 (fridge+dump)=277 mbar. MC = 3.00 K. |
| 1250 | Open 1K Pot needle valve → 15°. 1K Pot → 2.35 K / 6.0 mbar |
| 1255 | Open 1K Pot needle valve → 30°. 1K Pot → 2.21 K / 7.0 mbar |
| 1300 | Open 1K Pot needle valve → 45°. 1K Pot → 2.08 K / 9.5 mbar |
| 1340 | MC/Still/1KPot = 2.14/1.95/1.52. G1(fridge+dump) = 59 mbar and getting flat. |
| 1340 | Close V3 and V9, leaving 59 mbar mixture in dump (G2) |
| 1340 | Turn on 3He pump. G1(condenser) → 74 mbar |
| 1340 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 344 mbar. MC(H35) → 1.64 K. Still → 1.64 K / 80 mbar |
| 1345 | V6 → 13.0%. Condenser(G1) peaks at 332 mbar. MC(H35) → 1.44 K. Still(P1) → 1.49 K / 14 mbar. |
| 1350 | V6 → 13.4%. Condenser(G1) peaks at 232 mbar. MC(H35) → 1.24 K. Still(P1) → 1.20 K / 4.5 mbar. |
| 1355 | V6 → 13.8%. Condenser(G1) doesn't really peak. MC(H35) → 1.07 K. Still(P1) → 1.07 K / 1.4 mbar. |
| MC wiggled between 1.05 and 1.25 K, Al transition | |
| 1410 | V6 → 14.4%. Condenser(G1) peaks at 138 mbar. MC(H35) → 0.43 K. Still(P1) → 1.07 K / 0.7 mbar. |
| 1415 | V6 → 15.0%. Condenser(G1) peaks at 137 mbar. MC(H35) → 0.30 K. Still(P1) → 1.07 K / 0.4 mbar. |
| 1420 | V6 → 100.%. Condenser(G1) peaks at 137 mbar. MC(H35) → 0.15 K. Still(P1) → 1.03 K / 0.095 mbar. |
| 1425 | Open V14 to pull the rest of the mixture out of the dump into circulation. Close and reopen 2 times to keep Still pressure below 120 mbar. On last opening Still peaks at 75 mbar, Condenser peaks at 212 mbar, MC peaks at 145 mK, then all relax again. 1K → 1.56 K / 11 mbar. |
| 1450 | Still = 0.85 mbar. Close V14 |
| 1515 | MC = 29.4 mK |
| 1515 | 1K Pot = 1.52 K / 6.5 mbar, pressure flat. Should open it further. |
| 1515 | Open 1K Pot needle valve → 60°. 1K Pot → 2.08 K / 11.5±0.5 mbar |
| 1545 | MC = 27.8 mK |
| 1635 | MC = 27.4 mK |
| 1635 | Plug in DCRCs 1&3 |
| 1640 | Check phonon channels. Relock and adjust offsets to get all baselines ~ -0.8 V |
| 2040 | MC = 29.1 mK |
| 2040 | Adjust offsets to get all phonon baselines near -0.800 V |
| 2051 | Dial HV up to -108.1V nominal, -106.1 V actual, for 15% prebias (using RootSequencer) |
| 2057 | Dial HV down to -94V nominal, -91.8V actual |
| 2100 | HV = -91.8 V, Vtest = -21.9 mV, Ileak = -24.1 uA, Vdet = -82.2 V (90%). |
| 2110 | Set NaI array trigger window to 4.73 - 5.93 MeV |
| 2113 | (meant to start data series but forgot to enable the logger) |
| 2150 | HV = -91.8 V, Vtest = -21.9 mV, Ileak = -24.1 uA, Vdet = -82.2 V (90%). |
| 2153 | Start -82.2 V PuBe data series 55 min long, SiHV-triggered with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 2249 | Start -82.2 V PuBe data series 634 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 |
| 2255 | DCRC1pA baseline = -0.785 V |