2024/08/20 (Tuesday)

Status	Run 81 beginning, initial LHe transfer yesterday, mixture in fridge with 3He pump off

1201	Fill LN2 cold trap bath
1245	MC(Cernox)/Sorb/1K Pot = 4.71/20/4.72 K, G1/G2 = 450/440 mbar, MB = 36%
1249	Turbo on IVC = 86 nbar.

–	Pump out line leading to 1K Pot with scroll pump (V4a open, 1kpot speedivalve closed). Then switch the line over to the 4He pump. Turn on 4He pump and make sure the pump exhaust is connected to recovery and open valve to recovery lines.
–	Check pressure in 1K Pot by opening the 1kpot speedivalve with V4a closed: Mechanical gauge = 0.33 bar.
–	Pump out 1K Pot by slowly opening V4a then the manual valve at the 4He pump until it just starts to make noise, once it quiets down somewhat open it up a little more. continue this until the valve is fully open. Once P2 below 0.1, close V4A and manual valve at the pump . We will open 1K pot on Monday. Doing 2nd day of He transfer only.

1252	Prepare for LHe transfer. Open cmd prompt, goto cd C:\Users\spa-k100lab\Desktop and type python cam_snapshots.py. Make sure that cam_snapshots folder is empty. Get the He dewar.
1314	Begin LHe transfer @ MB = 33.6%
1414	End LHe transfer @ MB = 95.5%
	To stop the camera, press q on the command prompt window. If it doesnot respond, you can do Ctrl+C