2021/11/22 (Monday)

Status	Beginning Run 75.
	1K Pot isolated. MB raised. Cryostat vacuum jacket (CVJ) pumped out.
1135	Check contents of warm LN2 Trap 2: 79.4 mbar! What happened??? Pump out with Scroll Pump.
1150	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.2%
1155	Increase V6 → 12.6% to restart flow
1240	Increase V6 → 12.7% to restart flow
1255	Stop cleaning through Trap 1 after 65 min. G2 flow pressure was 560-730 mbar. Pump mixture to dump. Removed 8.4 mbar.
1330	Check contents of warm LN2 Trap 2 again, see if it has crept up in the last 2 hours. 1.6 mbar. Pump out with Scroll Pump. If this actually is a steady leak, the rate of the leak is roughly consistent with how much it went up over the weekend. Pumping out Trap 2 only takes it down by 0.5 mbar, so it may be more accurate to say only 0.5 mbar leaked in over the last two hours.
1415	Check contents of mostly warm LN2 Trap 1: 8.6 mbar. I'll let is sit for a bit in case it's not fully warm.
1440	LN2 Trap 1 pressure has not increased, if anything it has fallen by about 0.4 mbar. Pump it out with Scroll Pump.
1505	While pumping out Trap 1 it actually looks like 7.4 mbar was removed. I guess we'll conservatively call it 8.4 mbar.
1505	Turn off 3He pump. (No time for another cleaning, I have to go home to attend a meeting.)