2021/03/26 (Friday)

Status	Run 74 in progress. Warming the fridge to fix short and presumed thermal touch. DCRCs off, disconnected. All mixture in dump. 1K Pot isolated. Helium gas in IVC and cryostat vacuum jacket. Fridge open to IGH.
0415	MC(Cernox)/Sorb = 129/250(max) K
0800	Recovery = 427220.28 cuft (8:00:00) / 0.12 cuft/hr.
0800	MC(Cernox) = 150 K. P1(fridge) = 8.5 mbar.

Warmup todo list:

Close Condenser speedivalve, Still gate valve, and all IGH valves
Close main bath recovery valve
Turn off recovery meter camera
Check Cable 3 qI Feedback short to chassis (and note the temperature)
Note that on Sunday the fridge computer will reboot. To restart the LabView VIs follow the fridge computer instructions

1448	Derek enters lab.
1450	Close condenser speedivalve, still valve and all IGH valves.
1459	Recovery = 427220.93 cuft / 0.07 cuft/hr.
1459	Close large orange wall valve and turn off camera.
1500	Unplug cable 3 from diverter board and into breakout box.
1503	MC(Cernox) = 181.9 K, cable 3 qi feedback to chassis < 1 ns. Looks like the short is gone entirely? Weird.
1526	Check warming rate using Newton's law of cooling and predicted dew point on Monday.
	The dew point Monday should be around 277.6 K and around 270.5 K on Tuesday as per this
	~~Calculated time until dew point is about 21 hours, meaning we should hit around 270 by tomorrow afternoon. That seems a bit fast so I may have messed up the calculation somewhere…~~
1532	Recalculated the heating (had an algebra mistake) from now until 277.6 K, the law gives roughly 51.4 hours which is just over two days meaning we should be close to dew point temperature by Sunday afternoon. Still seems fast, but I'm more confident with this number. I'm not going to let more gas into the vacuum jacket today. Will recheck warming rate over the weekend.
1540	Derek leaves lab.