2022/10/22 (Saturday)
- 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 sixteenth 5K pumpout. | |
| 1018 | Turbo on IVC = 1.0 nbar. With Turbo valved out for 1 minute IVC = 10 nbar. |
| 1019 | Close IVC valves on top of fridge |
| 1029 | Begin LHe transfer @ MB = 6.2% |
| 1042 | MB = 21.5% |
| 1045 | 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 = 0.32 bar on mechanical gauge. |
| 1046 | 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. |
| 1050 | Start pumping 1K Pot continuously |
| 1054 | MB = 63.0% |
| 1055 | MC = 5.92 K, cooling slowly. 1K Pot = 3.16 K / 2.6 mbar |
| 1056 | Open 1K Pot needle valve → 15°. 1K Pot → 2.81 K / 7.5 mbar |
| 1100 | Open 1K Pot needle valve → 30°. 1K Pot → 2.87 K / 7.5 mbar |
| 1105 | Open 1K Pot needle valve → 45°. 1K Pot → 2.78 K / 9.5 mbar |
| 1113 | G1/G2 = 329/319 mbar dropping linearly |
| 1113 | MC/1Kpot = 3.16/2.64K dropping linearly |
| 1121 | Ended LHe transfer @ MB = 94.8% |
| 1145 | Fill LN2 cold trap bath |
| 1245 | G1(fridge) = 45 mbar. MC = 1.84 K. 1K Pot = 1.51 K / 6.5 mbar |
| 1250 | Close V3 and V9, leaving 56 mbar mixture in dump |
| 1250 | Turn on 3He pump. G1(condenser) → 52 mbar |
| 1250 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 232 mbar. MC(H35) → 1.45 K. Still → 1.49 K / 40 mbar |
| 1255 | V6 → 13.0%. Condenser(G1) peaks at 233 mbar. MC(H35) → 1.29 K. Still(P1) → 1.32 K / 9 mbar. |
| 1300 | 1K Pot = 1.56 K / 12 mbar |
| 1300 | V6 → 13.4%. Condenser(G1) peaks at 202 mbar. MC(H35) → 1.14 K. Still(P1) → 1.22 K / 5.0 mbar. |
| 1305 | V6 → 13.8%. Condenser(G1) peaks at 177 mbar. MC(H35) → 1.04 K. Still(P1) → 1.04 K / 1.6 mbar. |
| MC bounced around 1.04-1.19 K (Al transition) | |
| 1310 | V6 → 14.4%. Condenser(G1) peaks at 153 mbar. MC(H35) → 0.81 K. Still(P1) → 1.01 K / 0.9 mbar. |
| 1315 | V6 → 15.0%. Condenser(G1) peaks at 153 mbar. MC(H35) → 0.64 K. Still(P1) → 1.05 K / 0.65 mbar. |
| 1320 | V6 → 100.%. Condenser(G1) peaks at 158 mbar. MC(H35) → 0.30 K. Still(P1) → 1.03 K / 0.17 mbar. |
| 1335 | 1K Pot = 1.56 K / 10.5±0.5 mbar. Good - it was flat at 7.5 mbar for a while but now it looks good. |
| 1345 | MC = 40 mK. Still = 1.08 K / 0.11 mbar. G1/G2 = 111/126 mbar. 1K Pot = 1.56 K / 10.5±0.5 mbar. |
| 1345 | Open V14 to pull the rest of the mixture out of the dump into circulation. Still peaks at 55 mbar, Condenser peaks at 168 mbar, MC peaks at 83 mK, then all relax again. 1K Pot unaffected. |
| 1355 | Plug in DCRCs 1 and 3 |
| 1410 | Still = 0.75 mbar. Close V14 |
| 1550 | MC = 28.2 mK. Still = 1.11 K / 0.110 mbar. G1/G2 = 107/122 mbar. 1K Pot = 1.57 K / 10±1 mbar. |
| 1600 | Check phonon channels. All but DCRC3pA are close to -0.8 V baselines. |
| 1610 | Adjust phonon offsets to get all baselines near -0.80 V |
| 1610 | MC = 29.2 mK, it has risen since messing with the phonon channels |
| 1614 | Dial HV up to -109.25V nominal, -107.1 V actual, for 15% prebias (using RootSequencer) |
| 1620 | Dial HV down to -94V nominal, -91.7V actual |
| 1623 | HV = -91.7 V, Vtest = -21.5 mV, Ileak = -23.6 uA, Vdet = -82.3 V (90%). |
| Note: I'm enabling DCRC4 for consistency in processing and data rate. But the NaI array is not in a fixed range so that data is not relevant in the current data | |
| Since the PuBe source is not in the lab we'll take some more Run68-style background data | |
| 1630 | DCRC1pA baseline = -0.796 V |
| 1630 | Start -82.3 V bg data series 859 good min long, SiHV-triggered with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| 1905 | DCRC1pA baseline = -0.801 V |
| 2145 | HV = -91.8 V, Vtest = -21.6 mV, Ileak = -23.7 uA, Vdet = -82.3 V (90%). Seeing some instability in the bias that I haven't seen before, jumping around a bit between -91.7 and -91.9 V |
| 2145 | DCRC1pA baseline = -0.809 V. It has been going down, maybe the detector is still cooling. |