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| Status | Run 76 in progress |
| Setup | Cable 2/1/3 → diverter/nothing/nothing → DCRC50(3)/DCRC55(1)/DCRCX(4), NaI trigger signal → DCRC52(6) |
| 1210 | Fill LN2 cold trap bath |
| 1212 | MC/Coldplate = 28.6/139 mK, Still = 1.12 K / 0.120 mbar / 0 mW, G1/G2= 183/176 mbar, 1K Pot = 18° / 1.64 K / 23±2 mbar MB=23.6%. |
Modifying LHe transfer procedure in an effort to improve recovery efficiency:
Starting transfer
When inserting lance into cryostat, leave it high up - lower it just enough so the o-ring seals above the extender. And plug the end as usual.
When inserting flexible piece into transfer Dewar, extend the telescoping end to get it partway into Dewar and leave it high, level with lance
Quickly connect flexible piece to lance - don't wait for plume
Let sit for a few minutes until pressure goes down. Possibly extend telescoping piece further into Dewar.
After a few minutes push the lance all the way down and the flexible piece down to be level with lance.
Ending transfer
Raise flexible piece high up in the transfer Dewar, above liquid level
Raise lance in cryostat, as far as possible before it freezes on o-ring
Wait for a bit to let pressure fall on its own (don't release any pressure)
Continue with end procedure as usual
if possible do this with 2 people, so the flexible part can be removed from the Dewar as quickly as possible.
| 1512 | Begin LHe transfer @ MB = 19.1% |
| 1600 | End LHe transfer @ MB = 96.5% |
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