2022/09/08 (Thurdsay)
- Lab in-personnel: Zach, 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 | |
| Pumping out IVC overnight for 5th time. | |
| 1400 | MB = 34.9 % |
| 1401 | MC/1KPot/Sorb = 5.64/>7/9.0 K |
| 1402 | Turbo on IVC = 1.4 nbar. With Turbo valved out for 1 minute IVC = 12 nbar. |
| 1403 | Fill LN2 cold trap dewar |
| 1404 | Close IVC valves on top of fridge |
| 1412 | 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 = 0.22 bar on mechanical gauge. |
| 1420 | 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). |
| 1423 | Start pumping 1K Pot continuously |
| 1428 | MC = 5.59 K, cooling slowly. 1K Pot = 3.30 K / 3.0 mbar, cooling slowly |
| 1430 | Open 1K Pot needle valve → 15°. 1K Pot → 3.07 K / 6.0 mbar |
| 1437 | Open 1K Pot needle valve → 30°. 1K Pot → 2.87 K / 8.5 mbar |
| 1442 | Open 1K Pot needle valve → 45°. 1K Pot → 2.55 K / 14 mbar |
| 1442 | G1/G2 = 397/378 mbar |
| 1551 | Begin LHe transfer @ MB = 33.3% |
| 1605 | Close V3 and V9, leaving 59 mbar mixture in dump |
| 1606 | Turn on 3He pump |
| 1611 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 309 mbar. MC(H35) → 1.54 K. Still → 1.57 K / 50 mbar. |
| 1622 | V6 → 13.0%. Condenser(G1) peaks at 260 mbar. MC(H35) → 1.37 K. Still(P1) → 1.40 K / 19 mbar. |
| 1632 | V6 → 13.4%. Condenser(G1) peaks at 245 mbar. MC(H35) → 1.20 K. Still(P1) → 1.19 K / 4.5 mbar. |
| 1639 | V6 → 13.8%. Condenser(G1) peaks at 209 mbar. MC(H35) → 1.01 K. Still(P1) → 1.07 K / 1.6 mbar. |
| 1648 | Condenser and still went up a bit, now G1 = 211 and Still(P1) → 1.15 K / 1.9 mbar |
| 1650 | V6 → 14.4%. Condenser(G1) peaks at 219 mbar. MC(H35) → 0.66 K. Still(P1) → 1.12 K / 1.1 mbar. |
| 1659 | V6 → 15.0%. Condenser(G1) peaks at 214 mbar. MC(H35) → 0.35 K. Still(P1) → 1.13 K / 0.65 mbar. |
| 1716 | V6 → 100%. Condenser(G1) peaks at 194 mbar. MC(H35) → 0.19 K. Still(P1) → 1.07 K / 0.14 mbar. |
| 1820 | MC = 28.7 mK and pretty flat, Condenser = 144 and pretty flat. 1K Pot = 1.58 K / 14±1 mbar. |
| 1820 | Open V14 to pull the rest of the mixture out of the dump into circulation. |
| MC rises to 80 mK, Still peaks above 50 mbar then falls again, Condenser rises to 232 mbar. 1K Pot unaffected. | |
| as usual we'll wait till Still is below 1 mbar then close V14. | |
| 1855 | Still = 0.5 mbar. close V14 |