2025/08/03 (Sunday)

^ Status | IVC turbo pumping overnight. leak level dropped to 9e-6 now.|

1200	Refill CT. LHe level check: 41%
1220	Restart He3 pump, continue collecting mixture. V2 and VT open. V1 open, pumping from both side of the fridge.
1230	leak level now at 7.4e-6.
1230	desktop restarted: System Boot Time: 8/3/2025, 2:06:32 AM .
1230	restart temperature monitoring: still = 24.58 K; 1K = 14.17 K; H35 = 17.14 K; Tower = 18.67 K; MC(Cernox) = 20.33 K
1240	will wait until all mix is collected and He leak rate low enough, then inject He exchange gas to cool down again. This time will monitor H35.

1520	Putting the mix back into the line. Leak rate increased on e-7 level. from 5.4e-6 to 5.6 e-6.
1530	valve out LD. See if temperatures change: 1K = 10.9 K, MC(Cernox) = 20.9 K, still = 24.9 K.
1630	temperature is slowly dropping: 1K = 10.55 K, MC(Cernox) = 20.79 K, still = 23.08 K. Could be either because of lack-of-turbo cooling, or mixture leak.
1630	open to LD again. Jump to 6e-5 first, then slowly die down to 5e-5, and slowly to 3e-5.
1635	collecting mix.
1640	1K = 11.83 K (why the jump??), MC = 20.68 K, still = 22.84 K
1645	next I will keep the mix in the dump, and valve out the LD for an hour, and see what happens.
1745	leak rate back to 5.7e-6.
1745	mix back into the dump. Close all GHS valves. stop 3He pump.
1745	temperatures: 1K = 14.55 K, MC(Cernox) = 20.37 K, still = 22.98 K. still temperature stopped decreasing.
1745	Now valve out LD.
1845	1K = 14.78 K, MC(Cernox) = 20.3 K, still = 24.67 K.
1845	open IVC to LD, leak rate: 5e-5, then decreasing slowly to 3e-5. Very similar behaviour compared to when mix is in the line.
1850	slightly open 1K needle valve. No change of leak rate.
1855	introduce He exchange gas. temperatures started dropping.
1925	MC(Cernox) is going down at a rate of 0.9 K / 2 min. Still started with 1K/2 min but is plateaued at 15 K. why??? 1K is also plateauing at 8.6 K
1925	MC(Cernox) = 11.3 K, 1K = 8.7 K, still = 15.6 K.
1932	MC(Cernox) = 9.8 K, start pumping on IVC.