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2020/07/22 (Wednesday)

Previous Day

  • Lab in-person: Matt
  • Virtual partner: Zach/Derek
1300 Matt Fritts body temperature = 96.8 F
Setup Run 73. DIB 1/3/4 → Stripline 43/48/41 → Cable 3/1/2 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC50(3)-master; DCRC33(2) → HV control. DCRCs on overnight. Lead/poly shield erected (4 lead walls, 2 poly walls).
1230 MB 55.2%
1300 Tower = 61.8 mK, G1/G2= 259/240 mbar, Still = 0.160 mbar / 5 mW, 1K Pot = 1.68 K / 38±2 mbar.
Tower has wavered, fell as low as 60.4 mK at 3am then wandered back up. More steady for the last 4 hours.
1400 Tower/MC/Coldplate = 61.4/31.1/193 mK, Still = 1.50 K / 0.16 mbar / 5 mW, G1/G2= 259/240 mbar, 1K Pot = 1.67 K / 45±3 mbar.
1410 Fill LN2 cold trap bath
1415 Tape plastic sheet over end of E-box, so we can purge it with N2 to reduce HV current leakage
1435 Hook up HV box test resistor to Keithley voltage meter, start reading this out on OmniLogger vi on fridge computer.
1445 Start purging E-box with N2 from the LN2 Dewar vent. Opened the valve just barely enough to feel some gas pressure.
1445 Matt leaves lab
1745 Matt Fritts body temperature = 97.4 F

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