2022/08/21 (Sunday)
- 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 behind lead wall on West side of lead/poly shield. |
| Suspended circulation two days ago and stopped 1K Pot. Pumped out the IVC overnight with fridge >4K. Yesterday started pumping 1K Pot again, didn't open needle valve yet. | |
| 1050 | Open V9 to let mix from dump back into fridge (through cold LN2 Trap 1) |
| 1455 | MC/Coldplate = 157/191 mK, Still = 1.60 K / off-scale mbar / 0 mW, G1/G2 = 24.0/17.8 mbar, 1K Pot = closed / 1.43 K / 2.8±.2 mbar, MB = 40.7 % |
| 1455 | IVC = 19 nbar |
| 1500 | Open up turbo to IVC, turbo on IVC = 2.5 nbar after a minute. |
| 1508 | Begin LHe transfer @ MB = 40.2 % |
| 1513 | Begin LN2 transfer |
| 1520 | 1K Pot = 1.42 K / 3.5±1 mbar, MC = 1.56 K, G1/G2 = 23/20 mbar. |
| 1520 | Open 1K Pot needle valve → 15°. 1K Pot → 1.53 K / 8 mbar. |
| 1530 | Open 1K Pot needle valve → 30°. 1K Pot → 1.56 K / 12 mbar. |
| 1535 | Open 1K Pot needle valve → 45°. 1K Pot → 1.59 K / 19 mbar. |
| 1556 | Ended LHe transfer @ MB = 89.2% |
| 1645 | MC (H35) = 1.56 K, G1(fridge) = 31 mbar. 1K Pot = 45° / 1.60 K / 18±1 mbar. |
| 1645 | Close V3 and V9, leaving 24 mbar (G2) in the dump. 3He pump is on. |
| 1650 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 142 mbar. MC(H35) → 1.5 K, bounces a little, then climbs to 1.52 K. 1K Pot remains stable. Still pressure dips below max a few times. |
| 1700 | V6 → 13.0%. Condenser(G1) peaks at 218 mbar. MC(H35) fall to 1.46 K. Still(P1) → 50 mbar. |
| 1710 | V6 → 13.4%. Condenser(G1) peaks at 288 mbar. MC(H35) → 1.31 K (wiggled a little at 1.4), Still → 1.30 K / 6.5 mbar. |
| 1715 | V6 → 13.8%. Condenser(G1) doesnt really peak, → 200 K. MC(H35) → 0.82 K. Still(P1) → 3.0 mbar. |
| 1735 | V6 → 14.5%. Condenser(G1) peaks at 217 mbar. MC(H35) → 0.66 K. Still → 1.16 K / 1.3 mbar. |
| 1745 | V6 → 15.0%. Condenser(G1) peaks at 210 mbar. MC(H35) → 0.35 K. Still → 1.15 K / 0.75 mbar. |
| 1755 | V6 → 100%. Condenser(G1) peaks at 203 mbar. MC(H35) → 0.14 K. Still → 1.11 K / 0.14 mbar. |
| 1805 | Open V14 to let the remaining mix out of the dump and into circulation. P1(Still) peaks at 1.16 K / 14 mbar then falls again. MC(H35) peaks at 86 mK. Condenser peaks at 212 mbar. |
| 1825 | Still = 0.75 mbar. Close V14. |