2022/10/11 (Tuesday)
- 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 source behind lead wall on West side of lead/poly shield. |
| NaI trigger window: 7.6-11.2 MeV | |
| thirteenth 5K pumpout yesterday, turbopumping IVC overnight. | |
| 1100 | MC/1KPot/Sorb = 5.22/6.12/7.8 K. G1(fridge+dump) = 541 mbar |
| 1105 | Turbo on IVC = 1.0 nbar. With Turbo valved out for 1 minute IVC = 10 nbar. |
| 1105 | Close IVC valves on top of fridge |
| 1110 | 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 = 0.25 bar on mechanical gauge. |
| 1110 | 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). |
| 1115 | Start pumping 1K Pot continuously. 1K Pot → 3.22 K / 3.0 mbar |
| 1125 | MC starts falling quickly. Fridge pressure falling. |
| 1140 | MC drops quickly from 4.1 to 3.3 K |
| 1335 | MC/1KPot = 2.46/2.06 K. G1(fridge+dump) = 131 mbar |
| 1340 | 1K Pot = 0° / 2.04 K / 3.0 mbar |
| 1340 | Open 1K Pot needle valve → 15°. 1K Pot → 1.61 K / 6.0 mbar |
| 1345 | Open 1K Pot needle valve → 30°. 1K Pot → 1.56 K / 7.5 mbar |
| 1350 | Open 1K Pot needle valve → 45°. 1K Pot → 1.57 K / 10 mbar |
| 1425 | MC = 1.90 K, it kinked at 2.06 K (lambda point). G1(fridge) = 51 mbar |
| 1510 | 1K Pot = 1.59 K / 11.5±0.5 mbar |
| 1510 | MC = 1.73 K. G1(fridge+dump) = 36 mbar |
| 1515 | Fill LN2 cold trap bath |
| 1515 | Close V3 and V9, leaving 46 mbar mixture in dump (G2) |
| 1515 | Turn on 3He pump. G1(condenser) → 41 mbar. |
| 1520 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 236 mbar. MC(H35) → 1.44 K. Still → 1.48 K / 40 mbar |
| 1535 | V6 → 13.0%. Condenser(G1) peaks at 282 mbar. MC(H35) → 1.37 K. Still(P1) → 1.40 K / 17 mbar. |
| a bit different from usual, MC was stuck around 1.45 K for a while. Falling now. | |
| 1545 | V6 → 13.4%. Condenser(G1) peaks at 179 mbar. MC(H35) → 1.08 K. Still(P1) → 1.14 K / 3.4 mbar. |
| MC kinked between 1.19 and 1.06 K, Al transition | |
| 1555 | V6 → 13.8%. Condenser(G1) peaks at 170 mbar. MC(H35) → 0.80 K. Still(P1) → 1.11 K / 2.0 mbar. |
| 1600 | V6 → 14.6%. Condenser(G1) peaks at 176 mbar. MC(H35) → 0.57 K. Still(P1) → 1.10 K / 1.0 mbar. |
| hmm, that's supposed to be 14.4%. Well whatever. | |
| 1610 | V6 → 15.0%. Condenser(G1) peaks at 167 mbar. MC(H35) → 0.24 K. Still(P1) → 1.14 K / 0.60 mbar. |
| 1615 | V6 → 100%. Condenser(G1) peaks at 157 mbar. MC(H35) → 0.06 K. Still(P1) → 1.09 K / 0.12 mbar. |
| 1635 | MC = 43 mK. Still = 1.09 K / 0.11 mbar. G1/G2 = 126/140 mbar. 1K Pot = 1.59 K / 11±1 mbar. |
| 1635 | Open V14 to pull the rest of the mixture out of the dump into circulation. Still peaks at 28 mbar, Condenser peaks at 173 mbar, MC peaks at 69 mK, then all relax again. 1K Pot unaffected. |
| 1655 | Still = 0.85 mbar. Close V14 |
| 1700 | MC = 31.5 mK. Still = 1.08 K / 0.100 mbar. G1/G2 = 122/134 mbar. 1K Pot = 1.59 K / 11±1 mbar. |
| 1700 | Plug in DCRCs 1&3 and start DAQ programs |