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2024/08/28 (Wednesday)

Previous Day

  • Lab in-personnel: Himangshu, Zach
Status Partial warmed up day before yesterday. Cooldowned yesterday but base temperature is fluctuating. MC(H35) = 84 mK

1230 Doing a partial warmup to diagnoze the issue. It can be a mixture not very clean issue (last contaminants ~ 100 mbar) or VT valve being wobbly issue.
Close VT to stop circulation.
VT is now fully closed, close V2 (Still pressure is rising, currently 1.5 mbar, Condenser pressure falling). Turn off 3He pump
Open V5 to let mixture from Condenser side into Still side.
Close 1K Pot needle valve
Close 1K Pot speedivalve, V4a, 4He pump inlet valve. Turn off 4He pump. Close recovery valve to 4He pump outlet. NOTE: remember to open recovery valve when the pump is turned back on.
1313 Begin LHe transfer @ MB = 33.9%
1355 End LHe transfer @ MB = 91.9%