| Status: | Tried circulating yesterday but had difficulties. Left mixture open to fridge overnight with pump off. 1K Pot is on. |
| 0815 | Still/Coldplate/MC(H35)/Tower = 1.8/2.2/1.8/1.9 K, G1/G2 = 45/45 mbar. 1K Pot = 1.7 K / 28 mbar. MB = 39.0%. |
| | Tower much cooler now. This is promising. |
| 0820 | Close V9 leaving 43 mbar of mixture in dump. Start 3He pump. |
| 0825 | Fill LN2 cold trap bath Dewar |
| 0830 | Start circulation: open V6 to 13.0%, circulation pressures start to rise. Still temperature falls a little. |
| 0850 | Opening V6 in steps of a few tenths of a percent. So far circulation pressures have not exceeded 200 mbar. |
| 0855 | V6 = 13.5%. Still = 1.45 K / 1000 mbar (pressure oscillating, occasionally dips into readable range). Coldplate/MC(H35)/Tower = 1.7/1.5/1.6 K, G1/G2 = 115/145 mbar. 1K Pot = 1.7 K / 22 mbar. |
| 0915 | V6 = 14.3%. Still = 1.02 K / 3.0 mbar. Coldplate/MC(H35)/Tower = 0.84/1.1/1.2 K, G1/G2 = 105/115 mbar. 1K Pot = 1.7 K / 26 mbar. |
| 0935 | V6 = 16.0%. Still = 1.03 K / 0.5 mbar. Coldplate/MC(H35)/Tower = 0.30/0.30/0.70 K, G1/G2 = 115/120 mbar. 1K Pot = 1.7 K / 26 mbar. |
| 0955 | V6 = 25.0%. Still = 1.01 K / 0.16 mbar. Coldplate/MC(H35)/Tower = 228/165/648 mK, G1/G2 = 100/105 mbar. 1K Pot = 1.7 K / 28 mbar. |
| 1110 | V6 = 25.0%. Still = 1.01 K / 0.13 mbar. Coldplate/MC(H35)/Tower = 226/167/630 mK, G1/G2 = 100/105 mbar. 1K Pot = 1.7 K / 28 mbar. |
| | Definitely still seems to be some cryo problem. Tower is stuck at around 0.6 K. |
| 1112 | Open V6 to 100%. Still pressure decreases to 0.12mbar. |
| 1117 | Open V14 to let the rest of the mix from the dump into circulation. P1 rises to 36mbar before beginning to drop. G1/G2 have risen to 128/141mbar and have stabilized. Keep V14 open while P2 pumps down back to typical Still pressure levels. |
| 1145 | V6 = 100%, V14 still open. Still = 1.23 K / 0.45 mbar. Coldplate/MC(H35)/Tower = 248/—/620 mK, G1/G2 = 99.0/103 mbar. 1K Pot = 1.68 K / 26 mbar. |
| 1220 | V14 still open. Still = 1.17 K / 0.24 mbar. Coldplate/MC(H35)/Tower = 238/159/611 mK, G1/G2 = 99.0/104 mbar. 1K Pot = 1.68 K / 28 mbar. |
| 1227 | P1 has fallen to 0.22mbar. Will probably eventually fall to typical values, but why wait? Close V14 and let circulation continue as normal. |
| | P1 quickly drops to 0.12mbar as before. |
| 1310 | V14 closed. Still = 1.18 K / 0.11 mbar. Coldplate/MC(H35)/Tower = 238/156/600 mK, G1/G2 = 100/106 mbar. 1K Pot = 1.68 K / 24 mbar. |
| 1450 | Commence LHe transfer (28.2%) |
| 1545 | End LH transfer (93.5%). |
| 1555 | Release main bath pressure. Fill LN2 cold trap. |
| 1625 | Still = 1.14 K / 0.10 mbar. Coldplate/MC(H35)/Tower = 228/149/555 mK, G1/G2 = 95/100 mbar. 1K Pot = 1.62 K / 15 mbar. |