| Status | Mixture in fridge, turbo pumping on IVC, fridge cooling slowly |
| | Again yesterday before leaving P2 was creeping up, now it is maxed out at 1000 mbar, maybe there is a small leak somewhere? |
| 1224 | MC(Cernox) = 26.5 K, G2/G1 = 521/564 mbar, MB = 1.4 %. |
| 1225 | turbo on IVC = 0.19 ubar, after being valved out for a min IVC = 1.4 ubar |
| 1237 | Begin LHe transfer @ MB = 1.0 % |
| 1240 | Fill LN2 cold trap bath from bomb dewar via 5L dewar |
| 1247 | Pause LHe transfer by lifting up transfer lines above liquid level and turning off heater, Himangshu wants to add exchange gas while the MB level is low, reads -0.9% right now |
| 1256 | Added 30 ubar of He exchange gas. |
| 1259 | MC(Cernox)/Sorb/1K Pot = 14/14/6.99 K, IVC = 22 μbar, G1(fridge) = 549 mbar. G3(MB) = 120 mbar+1atm, MB = -1% |
| 1301 | MC temp hit 10 K, open turbo to IVC. IVC pressure hit 4e-4 mbar after about a minute. |
| 1312 | Resume LHe transfer |
| 1318 | Pump out line leading to 1K Pot with scroll pump (V4a open, 1kpot speedivalve closed). Then switch the line over to the 4He pump. Turn on 4He pump and make sure the pump exhaust is connected to recovery and open valve to recovery lines. |
| 1323 | Check pressure in 1K Pot by opening the 1kpot speedivalve with V4a closed: Mechanical gauge = 0.27 bar. |
| 1324 | Pump out 1K Pot by slowly opening V4a then the manual valve at the 4He pump until it just starts to make noise, once it quiets down somewhat open it up a little more. continue this until the valve is fully open. |
| 1330 | MC(Cernox)/Sorb/MC(H35) = 4.37/4.0/4.35, 1K Pot = 3.13 K / 0.95 mbar. G1 (fridge+dump) = 413 mbar. MB = 57.9% |
| | Leaving mixture in the fridge when starting 1K pot |
| 1333 | Open 1K Pot needle valve → 15° (half unit on the needle marks). 1K Pot → 2.84 K / 4.5 mbar. |
| 1340 | Open 1K Pot needle valve → 30°. 1K Pot → 2.44 K / 11 mbar. |
| | Since cleaning the needle valve and re-inserting it the new marks could yield slight different results from the old marks |
| 1341 | MC(H35) temp starts to decrease quickly, flattens at around 3 K |
| 1346 | MC(Cernox)/Still/MC(H35) = 3.03/2.91/3.06, 1K Pot = 2.37 K / 11 mbar. G1 (fridge+dump) = 307 mbar. |
| 1350 | Open 1K Pot needle valve → 45°. 1K Pot → 1.90 K / 24 mbar. |
| 1356 | Ended LHe transfer @ MB = 94.7 % |
| 1441 | MC(H35)/Still/1KPot = 1.86/1.89/1.60 K / 19 mbar, G1(fridge+dump) = 46.2 mbar |
| 1451 | Close V3 and V9, leaving 44.9 mbar in the dump. Turn on 3He pump. |
| 1456 | Start circulation through Trap 1. V6 → 12.6%. Condenser(G1) peaks at 187.3 mbar. P2 jumps up to 60 mbar, settling down to 50 mbar |
| 1502 | V6 → 13.0%. Condenser(G1) peaks at 88.4 mbar. MC(H35) → 0.88 K. Still(P1) → 1.11 K / 3 mbar. After some time the Condenser peaked even higher. Condenser(G1) peaks at 100 mbar |
| 1520 | V6 → 13.4%. Condenser(G1) peaks at 101.5 mbar. MC(H35) → 0.56 K. Still(P1) → 1.14 K / 2.2 mbar. P2 = 19 mbar |
| 1523 | V6 → 13.8%. Condenser(G1) peaks at 102.7 mbar. MC(H35) → 0.50 K. Still(P1) → 1.13 K / 1.5 mbar. |
| 1528 | V6 → 14.4%. Condenser(G1) peaks at 102.6 mbar. MC(H35) → 0.40 K. Still(P1) → 1.12 K / 0.9 mbar. |
| 1530 | V6 → 15.0%. Condenser(G1) peaks at 101.1 mbar. MC(H35) → 0.30 K. Still(P1) → 1.11 K / 0.65 mbar. |
| 1533 | V6 → 100.%. Condenser(G1) peaks at 101.5 mbar. MC(H35) → 0.24 K. Still(P1) → 1.09 K / 0.32 mbar. |
| 1535 | MC(H35) = 158 mK, Still = 1.06 K /0.180 mbar, 1KPot = 1.602 K / 19 mbar, G1/G2 = 97.3/107.5 mbar |
| 1615 | Tower(U28)/MC(H35)/Coldplate = 101.0/35.4/141 mK, Still(P1) = 1.10 K / 0.11 mbar / 0 mW, G1/G2 = 68.8/76.7 mbar, 1K Pot(P2) = 45° / 1.606 K / 18 mbar, MB = 93.2% |
| 1617 | Open V14 to let the remaining mix out of the dump and into circulation. P1(Still) peaks at 50 mbar then falls again. MC(H35) peaks at 77 mK. Condenser peaks at 95.3 mbar. |
| 1641 | Still (P1) < 1 mbar, close V14 |
| 1720 | Tower(RoX)/Tower(U28)/MC(H35)/Coldplate = 27.2/89.0/30.5/140 mK, Still(P1) = 1.1 K / 0.11 mbar / 0 mW, G1/G2 = 66.0/75.9 mbar, 1K Pot(P2) = 35° / 1.60 K / 18 mbar, MB = 92.3% |