| 1337 | Matt Fritts body temperature = 97.7 F. |
| 1330 | Matt arrives at lab. |
| 1340 | Turbo on IVC = 45 nbar. This is significantly worse than before the last disassembly/reassembly of the plumbing, so maybe the seals are worse this time. Or maybe the gauge is getting dirty. |
| 1355 | With turbo valved out for a while, IVC = 4.6 ubar. That also seems higher than usual. |
| 1400 | Leak detector on IVC, settling around 200 pbarL/s. Also higher than recently, usual it's around 70. So it definitely seems that it's worse after the last reassembly of E-box and T-pipe. |
| 1405 | Actually the LD has settled to 67 pbarL/s, which is similar to before. This leans more toward dirty gauge, not worsened vacuum. |
| 1415 | Leak checks at top of fridge. Strongest leak seen at T-pipe/elbow KF flange, originally →200 pbarL/s, later →700 pbarL/s. Smaller near elbow. No noticeable leak at other T-pipe flanges |
| 1420 | Start slowly filling IVC with N2 up to 1atm. |
| 1440 | Finish opening E-box and disconnecting striplines |
| 1505 | T-pipe is removed and now connected to Leak Detector with all openings capped (using the same o-rings as at the top of the fridge). |
| 1520 | Leak checks of T-pipe. At first the background was very low, 0.001 pbarL/s (bottomed out), and the elbow-side flange seemed to leak as high as 0.2 pbarL/s but not necessarily repeatable - that's very low anyway. The other flanges seemed to not show signal. Later, for some reason, base was higher - I tried venting and starting over, and redoing the calibration, but still high, up to 12 pbarL/s. At this level no leak was detectable at any of the flanges. |
| 1550 | Cap the LD with a thin wire to produce a leak, ~1000 pbarL/s base, squirting makes it rise 3 orders of magnitude (1e-3 mbarL/s). Cover entire cap and clamp with Q-Compound. Leak checking with Q-compound present produces same magnitude leak and the raised signal persists for a much longer time. What the hell, Q-compound seems worthless… |
| 1625 | Reassemble e-box and begin pumping on IVC with scroll pump. |
| 1635 | T-pipe wasn't sitting correctly, readjusted position let air suddenly into IVC. Let IVC up to 1 atmosphere with N2 again before readjusting and pumping again. |
| 1650 | Reattach T-pipe so it is in a better position, begin pumping on IVC with scroll pump. |
| 1657 | Scroll pump falls to 0.1 mbar. Swapping over to turbo pump. |
| 1702 | Matt leaves lab for the day. |
| 1800 | Matt Fritts body temperature = 98.3 F. |