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2021/08/08 (Sunday)

Previous Day

  • Lab in-personnel: Michael and Giulia
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.
Position of Am source: y = -30.00 mm
1110 Michael arrives in lab.
1122 Fill LN2 cold bath.
1139 Tower/MC/Coldplate = 80.9/33.6/ 191.5 mK, Still = 1.38 K / 0.08 mbar / 0 mW, G1/G2= 273.0/260.9 mbar, 1K Pot = 1.61 K / 20±1 mbar. MB = 36.5%.
1210 Start LHe transfer @ MB = 36.5%
1235 Main Bath level not increasing, actually decreased from 47%-44% on readout. Stopped fill procedure and removed all connections. Tested connectors with LHe from wall to see if gas flowed or was obstructed by ice. Both components let gas flow. Waiting for components to return to room temperature and have no condensation on surfaces.
1236 Nitrogen gas cylinder in back room is empty. Needs reorder.
1250 Flash detector for 10 minutes using DCRC1&3 LEDs.
1300 Start LHe transfer @ MB = 43.7%
1336 End LHe transfer @ MB = 85.1%
1342 Michael and Giulia leave lab

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