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2025/04/19 (Saturday)

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  • Lab in-personnel: Himangshu
Status Run 83 in progress
Initial He transfer two days ago. MC got to 4K fast, so kept turbo pumping overnight and let Main Bath empty.
1200 Refilled cold trap 1
1230 Started LHe transfer
1400 Ended LHe transfer
1430 Stopped turbo pumping on the IVC to let it cool below 7K
Switch to H35, MC(H35) = 7.4 K. Still = 17.4 K, 1Kpot = 7.8 K, Coldplate = 2663 ohm
1554 Open 1K Pot needle valve → 15° (half the unit on the needle marks). 1K Pot → 6.8 K / 1 mbar. 1K pot dipped a little bit, no change in Still or MC temp.

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