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2024/09/18 (Wednesday)

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  • Lab in-personnel: Himangshu
1400 Fill LN2 cold trap bath
1500 Close VT to stop circulation.
1501 VT is now fully closed by closing V2 as well (Still pressure is rising, Condenser pressure falling). Turn off 3He pump
1503 Close 1K Pot needle valve
1504 Stop DAQ programs and unplug DCRCs 1&3
1505 Open V5, releasing pressure from Condenser side to Still side
– Turn on Still and MC heaters to 20 mW each
1506 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.
1532 MC/1KPot = 3.74/– K. G1(fridge) = 550 mbar.
1532 Open V9 to release pressure into the dump.
1548 MC/1KPot = 3.39/– K and slowly going upwards
1549 Check pressure in IVC: 2.2 ubar. We are not yet in the scale of nbar to see changes. The turbo needs to be started earlier.
1552 Start pumping out IVC with turbo pump.
– Tower = 10.00 K. Turn off MC and Still heaters
Keeping Turbo pumping on the IVC overnight

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