2023/03/06 (Monday)
* Lab in-personnel: Zach, Himangshu
| LN2 cold trap dewar filled | |
| Begin another cooldown | |
| 1453 | Begin LHe transfer @ MB = -0.9% |
| 1457 | Turn on 4He pump. Open Recovery valve to 4He pump. Pump out line to 1K pot (open V4a, close 1K pot speedivalve and slowly open the 4He-pump inlet valve).Close the 4He-pump inlet valve once done. Check pressure in 1K Pot (with V4a open, 4He pump inlet valve closed). 1K Pot = 0.22 bar (-23.5 inHg) on mechanical gauge. |
| 1502 | Pump out 1K Pot slowly, opening the 4He pump valve until it just starts to make noise, then opening it more when it becomes more quiet. |
| 1504 | Open 4He pump valve fully |
| 1505 | Turbo on IVC = 1 nbar, after being valved out for a min, IVC = 10 nbar, open turbo again and close valves to IVC |
| 1508 | MC(H35) = 5.47 K, cooling slowly. 1K Pot = 3.39 K / 1.3 mbar |
| 1510 | Open 1K Pot needle valve → 15° (half a unit mark). 1K Pot (P2) → 3.13 K / 6.0 mbar |
| 1511 | Open 1K Pot needle valve a little more (like 5°). 1K Pot (P2) → 2.83 K / 8.5 mbar |
| 1518 | MC temp dropping |
| 1519 | MC(H35) = 3.26 K, Open 1K Pot needle valve → 30°. 1K Pot → 2.34 K / 16 mbar. |
| 1525 | Open 1K Pot needle valve → 45°. 1K Pot → 1.95 K / 24 mbar. |
| 1528 | MC(H35)/1Kpot = 3.04/1.85 K, MC temp dropping linearly. G1/G2 = 279/262 mbar . 1K Pot(P2) = 22 mbar |
| 1552 | Ended LHe transfer @ MB = 95.9% |
| 1609 | MC(H35)/1Kpot = 2.08/1.54 K and flat. G1/G2 = 56.5/51.7 mbar . 1K Pot(P2) = 9 mbar |
| 1610 | Close V3 and V9, leaving 51.0 mbar mixture in dump. Turn on 3He pump. |
| 1614 | Start circulation through Trap 1. V6 → 12.6%. Condenser(G1) peaks at 442.2 mbar. MC(H35) → 1.48 K. Still → 1.48 K / 16 mbar. |
| 1619 | V6 → 13.0%. Condenser(G1) remains flat at 370 mbar. MC(H35) → 1.23 K. Still(P1) → 1.24 K / 12 mbar. |
| 1622 | V6 → 13.4%. Condenser(G1) remains flat at 346 mbar. MC(H35) → 1.15 K. Still(P1) → 1.13 K / 11 mbar. |
| 1625 | V6 → 13.8%. Condenser(G1) remains flat momentarily at 325 mbar. MC(H35) → 1.03 K. Still(P1) → 1.10 K / 24 mbar. |
| 1628 | V6 → 14.4%. Condenser(G1) momentarily peaks at 316.2 mbar. MC(H35) → 0.99 K. Still(P1) → 1.06 K / 26 mbar. |
| 1634 | V6 → 15.0%. Condenser(G1) peaks at 341.7 mbar but took a while to reach the peak value. MC(H35) → 0.86 K. Still(P1) → 1.11 K / 26 mbar. |
| 1705 | V6 → 100.%. Condenser(G1) peaks at 357 mbar. MC(H35) → 0.61 K. Still(P1) → 1.08 K / 26 mbar. |
| 1731 | MC(H35) = 48 mK. Plug in DCRC3. |
| 1928 | MC(H35) = 33.5 mK and pretty flat, G1 = 258 mbar and pretty flat. 1K Pot = 1.63 K / 24 mbar. |
| 1929 | Open V14 to pull the rest of the mixture out of the dump into circulation. |
| 2150 | P1 = 0.16 mbar (<1), close V14 |