| 0845 | MC temperature has crept up since Friday to about 88 K. (Still ~100K.) Probably LN is gone. |
|---|---|
| 0850 | Have been turbopumping IVC since Friday. Pressure 1.2e-5 mbar pumping, 4.6e-4 mbar with turbo pump valved out. |
| 1010 | Added 4.6e-2 mbar He exchange gas to IVC |
| 1015 | Pump out main bath. Pump out 1K pot. |
| 1025 | Fill LN2 cold trap dewar. |
| 1045 | Start LHe transfer (0.0%). |
| 1240 | After end transfer with notion that dewar was empty, find that dewar still contains 53L. Resume transfer (-1.0%). |
| 1244 | Commence cryocleaning through cold trap 2. |
| 1330 | Start pumping out exchange gas from IVC when *still* temperature falls to 20 K. MC = 56 K, Sorb = 7.6 K, 1K Pot = 6.4 K. IVC was at 5.4e-3 mbar. |
| 1330 | Bath level 20.8% |
| 1350 | End LHe transfer (34.2%). |
| 1358 | IVC 1.6e-6 mbar pumping, 7.4e-6 mbar pump valved out. |
| 1504 | Stop cryocleaning mix |
| 1505 | IVC 1.4e-6 mbar pumping, 6.8e-6 mbar pump valved out. |
| 1515 | Dump = 796.3 mbar on G2, Pbar = 30.17 inHg, corrected Pdump = 804.8 mbar |
| 1609 | Letting mixture into fridge lines through both still and condenser lines. 12a left closed but speedivalve open. |
| 1733 | MC = 50.0 K (slowly cooling), Sorb = 19 K, Still = 35 K, Tower = 50.5 K |