2022/09/04 (Sunday)
- 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 behind lead wall on West side of lead/poly shield. |
| NaI trigger window: 7.6-11.2 MeV | |
| fourth 5K pumpout two days ago. Tried to cool to base yesterday but probably started too warm and didn't have 1KPot needle valve open wide enough. Stopped circulation and left 1K pot on overnight. | |
| 1430 | Unplug DCRCs 1&3 |
| 1430 | MC = 2.18 K. Condenser(G1) = 92 mbar. 1K Pot = 1.57 K / 9.5 mbar |
| 1437 | Begin LHe transfer @ MB = 34.6% |
| 1KPot temporarily rises → 1.63 K / 20 mbar, then falls back after a few minutes | |
| 1515 | Open 1K Pot needle valve → 45°. 1K Pot → 1.56 K / 12 mbar |
| 1522 | End LHe transfer @ MB = 86.7% |
| 1610 | MC = 1.73 K. Condenser(G1) = 35 mbar. 1K Pot = 1.59 K / 16 mbar |
| 3He pump is still running and V3 and V9 are still closed. Most of the mix is out of the dump and in the fridge. Ready to start circulation. | |
| 1810 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 300 mbar. Still(P1) → 50 mbar. MC(H35) → 1.52 K. |
| 1820 | V6 → 13.0%. Condenser(G1) peaks at 375 mbar. Still(P1) spikes a few times then falls to 10 mbar. Temporary downswing in 1K Pot. MC(H35) → 1.20 K. |
| 1830 | V6 → 13.4%. Condenser(G1) = 250 mbar (doesn't really peak). Still(P1) → 3 mbar. MC(H35) → 1.00 K. |
| 1840 | V6 → 13.8%. Condenser(G1) peaks at 227 mbar. Still(P1) → 2 mbar. MC(H35) → 0.70 K. |
| 1845 | V6 → 14.4%. Condenser(G1) peaks at 231 mbar. Still(P1) → 1.2 mbar. MC(H35) → 0.40 K. |
| 1850 | V6 → 15.0%. Condenser(G1) peaks at 229 mbar. Still(P1) → 0.6 mbar. MC(H35) → 0.21 K. |
| 1900 | V6 → 100.%. Condenser(G1) peaks at 238 mbar. Still(P1) → 0.2 mbar. MC(H35) → 0.10 K. |
| 1900 | Open V14 to pull remaining mix from dump to circulation. Still → 9.5 mbar then falls again. |
| 1920 | Still = 0.8 mbar. Close V14. MC = 38 mK |
| 2245 | MC = 26.7 mK, Condenser = 158 mbar, Still = 0.11 mbar, 1K Pot = 1.60 K / 16 mbar |