| | Current setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50. |
| | Overnight: taking Y data, last flash at 7:40. |
| 0845 | Tower/MC(H35)/MC sensor/Cold Plate = 31.0/25.6/41.0/154 mK, Still = 1.29 K / 0.12 mbar, G1/G2 = 140/140 mbar, 1K Pot = 1.73 K / 22 mbar, Main bath = 19.0% |
| 0850 | Remove Y-88 source from fridge, return to safe |
| 0910 | Stop circulation, begin recovering mixture: close V13a, open V9. Now pumping from still to dump. |
| 1010 | Remove top corner pieces of shield, store under wood table. Each corner = 4 lead sheets, 8 poly layers, 1 aluminum base with 2 screws |
| 1020 | Turn off DCRCs. Surge in Still temperature&pressure. Before turning off DCRCs, Still = 1.03 K / 0.036 mbar; after, Still = 0.83 K / 0.030 mbar |
| 1100 | Close large speedivalve to stop pumping on 1K Pot. P1 falls to 0.012 mbar. Close V4a to isolate 1K Pot pump inlet. Divert 1K Pot pump exhaust from recovery to air. |
| 1110 | Open V5 to pump directly from condenser and Trap 1 to dump. Turn on MC heater to 10 mW. MC → 1.4 K |
| 1120 | Turn on Still heater to 10 mW. Still → 5.3 K |
| 1430 | Dump pressure (G2) flat at 810 mbar, MC rises to 8.1 K. |
| 1435 | Finish removing shield from fridge. |
| 1445 | Close still valve and condenser valve for a few minutes to thoroughly pump out Trap 1. |
| 1450 | Close 12a and associated speedivalve to isolate Trap 1. Reopen still and condenser valves. |
| 1455 | Close still and condenser valves. Dump (G2) = 810.2 mbar. P_atm = 29.55 “Hg so Dump = 797.7 mbar. Mixture recovered. |
| 1500 | Add 4.6 mbar He exchange gas to IVC. 1K Pot temperature rises then falls; MC temperature falls to 4 K (since it is now in thermal contact with IVC). |
| 1505 | Close valves to isolate IVC. Then changed my mind - reopened IVC to gauge to monitor pressure. |
| 1510 | Close V6, V1, V5. Only V9 open. Turn off 3He pump. |
| 1515 | Turn off MC heater and Still heater (probably won't help much to boil off the bath) |
| 1515 | Main bath = 10.6% |
| 1640 | Close valves to recovery system. Lower cryostat Dewar (main bath) about 6”. Use clean tent HEPA filter fan to blow on exposed part of fridge to reduce condensation. |
| 1705 | MC = 4.4 K (Cernox), Sorb = 17.5 K, IVC = 7.4 mbar |