2022/09/27 (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 in storage in PAN443. |
| NaI trigger window: 7.6-11.2 MeV | |
| Tenth 5K pumpout last night. | |
| 1245 | MC/1KPot/Sorb = 5.32/6.52/8.3 K. G1(fridge) = 543 mbar |
| 1245 | Turbo on IVC = 1.4 nbar. With Turbo valved out for 1 minute IVC = 12 nbar. |
| 1245 | Close IVC valves on top of fridge |
| 1250 | 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 = 0.24 bar on mechanical gauge. |
| 1250 | 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). |
| 1255 | Start pumping 1K Pot continuously |
| 1255 | MC/1KPot/Sorb = 5.32/3.44/4.3 K |
| 1315 | MC drops quickly to 3.4 K |
| 1340 | MC/1KPot/Sorb = 3.35/3.08/4.0 K. G1(fridge) = 421 mbar and falling |
| 1400 | MC/1KPot/Sorb = 3.23/2.88/4.0 K. G1(fridge) = 367 mbar. MC, 1KPot, G1 falling linearly. |
| 1450 | MC/1KPot = 2.98/2.54. G1(fridge) = 262 mbar. All still falling. |
| 1505 | 1K Pot = 0° / 2.48 K / 2.2 mbar |
| 1505 | Open 1K Pot needle valve → 15°. 1K Pot → 2.28 K / 5.5 mbar |
| 1505 | MC = 2.89 K. G1(fridge) = 225 mbar |
| 1515 | Open 1K Pot needle valve → 30°. 1K Pot → 1.95 K / 8.0 mbar |
| 1515 | MC = 2.76 K. G1(fridge) = 187 mbar |
| 1520 | Fill LN2 cold trap bath |
| 1520 | Open 1K Pot needle valve → 45°. 1K Pot → 1.69 K / 12 mbar |
| 1602 | Sudden drop in MC from 2.07→1.99 K, looks like it got past the lambda point |
| 1605 | MC = 1.95 K. G1(fridge) = 53 mbar, pretty flat |
| 1610 | 1K Pot = 1.54 K / 7.0 mbar |
| 1610 | Close V3 and V9, leaving 40 mbar mixture in dump (G2) |
| 1610 | Turn on 3He pump. G1(condenser) → 63 mbar. |
| 1610 | Start circulation through Trap 1. V6 → 12.6%. Condenser peaks at 303 mbar. MC(H35) → 1.51 K. Still → 1.55 K / 60 mbar. |
| 1615 | V6 → 13.0%. Condenser(G1) peaks at 250 mbar. MC(H35) → 1.21 K. Still(P1) → 1.25 K / 6.0 mbar. |
| 1620 | 1K Pot = 1.59 K / 12.0 mbar |
| 1620 | V6 → 13.4%. Condenser(G1) peaks at 196 mbar. MC(H35) → 1.09 K. Still(P1) → 1.16 K / 3.8 mbar. |
| 1625 | V6 → 13.8%. Condenser(G1) peaks at 177 mbar. MC(H35) → 0.88 K. Still(P1) → 1.13 K / 2.4 mbar. |
| MC kinked around 1.2 and 1.1 K, Al Tc. | |
| 1635 | V6 → 14.4%. Condenser(G1) peaks at 176 mbar. MC(H35) → 0.36 K. Still(P1) → 1.15 K / 0.95 mbar. |
| 1645 | V6 → 15.0%. Condenser(G1) peaks at 166 mbar. MC(H35) → 0.24 K. Still(P1) → 1.14 K / 0.60 mbar. |
| 1650 | V6 → 100%. Condenser(G1) peaks at 164 mbar. MC(H35) → 0.14 K. Still(P1) → 1.08 K / 0.17 mbar. |
| 1720 | MC = 32.5 mK. Condenser(G1) = 118 mbar. Still = 0.110 mbar. |
| 1720 | Open V14 to pull the rest of the mixture out of the dump into circulation. Still peaks at 140 mbar, Condenser peaks at 193 mbar, MC peaks at 91 mK, then all relax again. 1K Pot unaffected. |
| 1745 | Still = 0.95 mbar. Close V14 |
| 1745 | Plug in DCRCs 1&3 |