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2021/06/20 (Sunday)

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  • Lab in-personnel: Gabe
Status Run 74 in progress. First cooldown after IVC rebuild. Started circulation last week.
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.
1145 Tower/MC/Coldplate = 175/30.9/179 mK, Still = 1.36 K / 0.080 mbar / 0 mW, G1/G2= 172/173 mbar, 1K Pot = 1.64 K / 24±2 mbar. MB= 64.4%
This is a lower Tower reading than we've seen before. Coldplate and Still are reading high, we've seen this before - both of these thermometers (which share a fridge cable) will show bimodal behavior.
1150 Begin LN2 transfer.
1206 Ended LN2 transfer.

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