2023/03/03 (Friday)
* Lab in-personnel: Zach, Ping, Himangshu
| 1321 | MC(H35) = 5.53 K |
|---|---|
| Begin another cooldown | |
| 1331 | Begin LHe transfer @ MB = 0.9% |
| 1333 | Fill LN2 cold trap dewar |
| 1340 | 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 = 0.23 bar (-23 inHg) on mechanical gauge. |
| 1345 | 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. |
| 1346 | Open 4He pump valve fully |
| 1350 | Turbo on IVC = 1 nbar, after being valved out for a min, IVC = 8.6 nbar, open turbo again and close valves to IVC |
| 1354 | MC(H35) = 5.34 K, cooling slowly. 1K Pot = 3.12 K / 3.4 mbar |
| 1355 | MC temp dropping |
| 1356 | MB = 28.5%, Open 1K Pot needle valve → 15° (half a unit mark). 1K Pot (P2) → 2.73 K / 8.5 mbar |
| 1404 | MC(H35) = 3.31 K, Open 1K Pot needle valve → 30°. 1K Pot → 2.06 K / 18 mbar. |
| 1412 | Open 1K Pot needle valve → 45°. 1K Pot → 1.75 K / 30 mbar. |
| 1415 | MC(H35)/1Kpot = 2.84/1.72 K, MC temp dropping linearly. G1/G2 = 221/230 mbar . 1K Pot(P2) = 29 mbar |
| 1437 | End LHe transfer @ MB = 95.6% |
| 1443 | MC(H35)/1Kpot = 2.11/1.56 K and flat. G1/G2 = 61.5/76.4 mbar . 1K Pot(P2) = 11 mbar. |
| 1445 | Close V3 and V9, leaving 73.5 mbar mixture in dump. Turn on 3He pump. |
| 1447 | Start circulation through Trap 1. V6 → 12.6%. Condenser(G1) peaks at 435 mbar. MC(H35) → 1.54 K. Still → 1.56 K / 28 mbar. |
| 1457 | V6 → 13.0%. Condenser(G1) peaks at 312 mbar. MC(H35) → 1.22 K. Still(P1) → 1.24 K / 5.0 mbar. |
| 1501 | V6 → 13.4%. Condenser(G1) peaks at 285 mbar. MC(H35) → 1.14 K. Still(P1) → 1.17 K / 3.2 mbar. |
| 1505 | V6 → 13.8%. Condenser(G1) peaks at 282 mbar. MC(H35) → 1.04 K. Still(P1) → 1.13 K / 2.0 mbar. |
| 1510 | V6 → 14.4%. Condenser(G1) peaks at 292 mbar. MC(H35) → 0.98 K. Still(P1) → 1.10 K / 1.1 mbar. |
| 1517 | V6 → 15.0%. Condenser(G1) peaks at 306 mbar. MC(H35) → 0.94 K. Still(P1) → 1.09 K / 0.8 mbar. |
| 1522 | V6 → 100.%. Condenser(G1) peaks at 335 mbar. MC(H35) → 0.81 K. Still(P1) → 1.03 K / 0.24 mbar. |
| 1553 | MC(H35) = 41 mK and pretty flat, G1 = 248 mbar and pretty flat. 1K Pot = 1.64 K / 28 mbar. |
| 1553 | Open V14 to pull the rest of the mixture out of the dump into circulation. |
| 1554 | MC(H35) rises to 95 mK, Still maxes out then falls again, Condenser(G1) rises to 364 mbar. 1K Pot unaffected. |
| 1611 | P1 = 1.5 mbar, close V14 (this is a little early but P1 is going down slowly and im impatient) |