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2021/07/17 (Saturday)

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  • Lab in-personnel: Zach and Pramod
Status Run 74 in progress. First cooldown after IVC rebuild.
Tower thermometer is reading high, probably this is a thermometer problem and the actual temperature is much lower. High noise in some of the charge channels.
Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/Source_mover_board+HV_diverter_board → DCRC50(3)/55(1). Kepco 40V supplye → HV BNC. No lead/poly shield. Currently both DCRCs are on.
1300 Tower/MC/Coldplate = 111.3/35.0/191 mK, Still = 1.38 K / 0.075 mbar / 0 mW, G1/G2= 303/273 mbar, 1K Pot = 1.63 K / 20±1 mbar.
1320 Begin LHe transfer @ MB = 27.8 %
1325 Begin LN2 transfer
1350 Paused LN2 transfer, seems to be going slow.
1353 ended the LHe transfer @ MB 84.8%.
1410 Resumed and ended LN2 transfer, while investigating I caused a big ice chunk to fall, I think the transfer tube might also have some ice in it.

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