2019/05/12 (Sunday)

Previous Day

Status	Warm after hitting fridge blockages, 3 times. Cryostat vacuum jacket and IVC both pumped out.
Setup	DIB1/3/4 → 3.2 MHz filters 2/3/1 → cable 3/1/2
	have been watching warm Cold Trap 1 pressure on G1 since Fri, looking for evidence of a leak.
1045	vuk1 seems to have restarted, so there's no plots of the pressures overnight. Start up the fridge vi's.
1050	Trap 1 (G1) = 1.8 mbar up from 1.5 mbar yesterday. Maybe a little leak or just ambient pressure difference?
1106	Pump out trap 1 using 4He pump.
1112	Check trap 2 contents: 1.3-1.0 = 0.3 mbar on G1. Pump out with 4He pump.
1120	Put both traps into LN2 bath. Fill LN2 bath full.
1135	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.4%
1140	Increase V6 → 12.7% to restart flow
1150	Increase V6 → 13.0% to restart flow. G1 decreases by ~3 mbar.
1209	Increase V6 → 13.1% to get G2>G1. G1 decreases by ~3 mbar.
1235	Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 570-640 mbar. Pump mixture to dump. Removed 5.4 mbar.
1258	Stop pumping out trap 1 and remove trap 1 from LN2 bath.
1300	Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 13.1%
1308	Increase V6 → 13.2% to restart flow
1315	Increase V6 → 13.4% to get G2>G1. G1 increases by 45 mbar.
1400	Stop cleaning through Trap 2 after 60 min. G2 flow pressure was 630-680 mbar. Pump mixture to dump. Removed 8.5 mbar.
1420	Stop pumping out trap 2 and remove trap 2 from LN2 bath.
1425	LN2 Trap 1 is mostly warm. Check contents: 7.3-1.9 = 5.4 mbar on G1. Pump out with 4He pump.
1445	Return Trap 1 to LN2 bath.
1450	Set up passive cleaning with both sides of dump and pump contents exposed to Trap 1. With 3He pump on, open V9, V4, V12A+speedi, and V13A.
1452	Top off LN2 cold trap.

Next Day