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2020/05/19 (Tuesday)

Previous Day

  • Lab in-person: Matt
  • Virtual partner: Zach
0025 Turbo on IVC = 74 nbar.
0205 Turbo on IVC = 63 nbar.
0415 Turbo on IVC = 54 nbar.
0700 Turbo on IVC = 46 nbar.
0955 Camera monitoring Turbo pump fell off its perch.
1408 Matt Fritts body temperature = 97.0 F
1430 Matt arrives in lab
1445 Turbo on IVC = 40 nbar; with turbo valved out for 10 min IVC = 2.2 ubar.
1500 Leak detector on IVC LD = 29 pbar*L/s
1505 Squirted helium near stripline tube, no change in leak rate.
Compare to Feb 17: then, squirting at South side of joint between knurled knobs cause signal to rise from 15 to 45 pbarL/s. With “generous” squirting the signal rose to 200 pbarL/s on Feb 17. Clearly it is much improved.
We will prepare to cryoclean the mixure.
1528 Check IGH pressures G1=45mbar, P1=4.5mbar, pumping them out with scroll pump.
1541 Check pressure in warm LN2 trap 1 = 1.2 mbar, pump out with scroll pump.
1545 Check pressure in warm LN2 trap 2 = 1.7 mbar, pump out with scroll pump.
1600 Cold trap dewar filled partially with LN2.
Surprisingly our LN2 Dewar seems to still have plenty of LN2 in it. We must have filled it right before the hibernation began, but still impressive that it held for 2 months.
1605 Matt leaves lab.
1645 Matt Fritts body temperature = 98.0 F

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