2021/02/10 (Wednesday)

Status	Run 74 prep. Main bath is up. Need to do more cryocleaning and prepare room-temperature circuit for HV biasing.
1250	Derek enters lab
1328	Remove Trap 1 from bath and put trap 2 in.
1330	Fill LN2 bath.
1335	Start cryo-cleaning through trap 2, V6 = 11%
1339	Just realized we forgot to check the contents of trap 2 before starting the cleaning, whoops. We're committed at this point so might as well finish this one…
1340	Open V6 → 11.4% to restart flow.
1350	Open V6 → 11.6% to restart flow.
1435	Stop cleaning through Trap 2 after 60 min. G2 flow pressure was 560-790 mbar. Pump mixture to dump. Removed 5.0 mbar.
1500	Measure contents of Trap 1 and pump it out.
1517	Begin cleaning through Trap 1, V6 = 11.2%
1522	Open V6 → 11.6% to restart flow.
1532	Flow was stopped or at least suppressed. Tried to open V6 further, pressure shot up to 950 mbar, immediately closed V6 and restarted flow with V6 = 11.6%.
1534	G2 resettled to around 700 and is now falling, going to continue cleaning normally until the hour mark.
1617	Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 590-790 mbar except for the one bump of 950. Pump mixture to dump. Removed 9.7 mbar.
1633	Close all valves and turn off He3 pump.
1635	Derek leaves lab.