2022/10/25 (Tuesday)
- Lab in-personnel: Zach
| 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 source in storage in PAN 434. |
| NaI scan data running overnight | |
| Warmed up last night for seventeenth 5K pumpout. | |
| 1048 | Turbo on IVC = 1.0 nbar. With Turbo valved out for 1 minute IVC = 10 nbar. |
| 1049 | Close IVC valves on top of fridge |
| 1056 | Begin LHe transfer @ MB = 1.1% |
| 1100 | Fill LN2 cold trap dewar |
| 1111 | MB = 21.7% |
| 1112 | 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 = 0.33 bar on mechanical gauge. |
| 1116 | Pump out 1K Pot in stages, follow Matt's new procedure of throttling the flow at the valve at the pump itself, opening just until the pump got louder, then waiting, then opening a little more, etc. |
| 1119 | Start pumping 1K Pot continuously |
| 1120 | MB = 55.4% |
| 1120 | MC = 5.83 K, cooling slowly. 1K Pot = 3.20 K / 2.2 mbar |
| 1121 | Open 1K Pot needle valve → 15°. 1K Pot → 2.96 K / 6.0 mbar |
| 1125 | Open 1K Pot needle valve → 30°. 1K Pot → 2.91 K / 7.0 mbar |
| 1129 | Open 1K Pot needle valve → 45°. 1K Pot → 2.82 K / 9.0 mbar |
| 1132 | G1/G2 = 364/346 mbar dropping linearly |
| 1132 | MC/1Kpot = 3.24/2.78K dropping linearly |
| 1145 | Ended LHe transfer @ MB = 91.4% |
| Forgot to use the heat gun for this transfer | |
| 1247 | G1(fridge) = 58 mbar. MC = 2.11 K. 1K Pot = 1.52 K / 7.0 mbar |
| 1248 | Close V3 and V9, leaving 61.2 mbar mixture in dump |
| 1250 | Turn on 3He pump. G1(condenser) → 69 mbar |
| 1250 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 338 mbar. MC(H35) → 1.54 K. Still → 1.58 K / 60 mbar |
| 1300 | V6 → 13.0%. Condenser(G1) peaks at 177 mbar. MC(H35) → 1.21 K. Still(P1) → 1.24 K / 5.5 mbar. |
| 1305 | V6 → 13.4%. Condenser(G1) peaks at 157 mbar. MC(H35) → 1.05 K. Still(P1) → 1.12 K / 2.8 mbar. |
| 1310 | V6 → 13.8%. Condenser(G1) peaks at 156 mbar. MC(H35) → 0.91 K. Still(P1) → 1.07 K / 1.5 mbar. |
| 1315 | V6 → 14.4%. Condenser(G1) peaks at 159 mbar. MC(H35) → 0.74 K. Still(P1) → 1.05 K / 0.9 mbar. |
| 1320 | V6 → 15.0%. Condenser(G1) peaks at 158 mbar. MC(H35) → 0.53 K. Still(P1) → 1.06 K / 0.60 mbar. |
| 1327 | V6 → 100.%. Condenser(G1) peaks at 156 mbar. MC(H35) → 0.21 K. Still(P1) → 1.03 K / 0.16 mbar. |
| 1341 | Plug in DCRCs 1 and 3 |
| 1345 | MC = 50 mK. Still = 1.07 K / 0.10 mbar. G1/G2 = 118/121 mbar. 1K Pot = 1.52 K / 7.0±0.5 mbar. |
| 1346 | Open V14 to pull the rest of the mixture out of the dump into circulation. Still peaks at over 30 mbar, Condenser peaks at 204 mbar, MC peaks at 102 mK, then all relax again. 1K Pot unaffected. |
| 1410 | Still = 0.75 mbar. Close V14 |
| 1445 | Bring PuBe source back into lab. |
| After moving the LN2 dewar the level meter settled at the bottom, it will need to be refilled tomorrow | |
| 1450 | MC = 28.8 mK. Still = 1.10 K / 0.065 mbar. G1/G2 = 114/117 mbar. 1K Pot = 1.56 K / 10±1 mbar. |
| 1735 | Turn on DAQ programs and adjust phonon offsets to get all baselines near -0.80 V |
| 1742 | Dial HV up to -108.1V nominal, -106.0 V actual, for 15% prebias (using RootSequencer) |
| 1745 | Set NaI array trigger window to 7.0 - 11.0 MeV |
| 1749 | Dial HV down to -94V nominal, -91.7V actual |
| 1751 | Start -82.1 V PuBe data series 120 min long, SiHV-triggered with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 1755 | HV = -91.7 V, Vtest = -21.7 mV, Ileak = -23.9 uA, Vdet = -82.1 V (90%). |
| 1755 | DCRC1pA baseline = -0.79 V |
| 1755 | MC = 29.4 mK |
| 1956 | Start -82.1 V PuBe data series 621 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 |
| 2000 | MC = 29.6 mK |
| 2400 | DCRC1pA baseline = -0.784 V |