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2021/06/19 (Saturday)

Previous Day

  • Lab in-personnel: Zach and 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.
1400 Tower/MC/Coldplate = 146/32.4/191 mK, Still = 1.38 K / 0.085 mbar / 0 mW, G1/G2= 167/162 mbar, 1K Pot = 1.64 K / 24±2 mbar.
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.
1424 Begin LHe transfer @ MB = 29.5%
1435 Begin LN2 transfer.
1450 Ended LN2 transfer.
1500 Ended LHe transfer @ MB = 90.1%
1515 Zach and Gabe leave the lab.

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