2021/02/09 (Tuesday)

Status	Run 74 prep. Main bath is up. Need to do more cryocleaning and prepare room-temperature circuit for HV biasing.
1350	Zach enters lab
1400	Checking the warm traps from the last two cleanings. Unfortunately LN2 Trap 2 was left pumping to dump since the last cleaning, forgot to stop this. So that pumped all the contaminants back to dump. We did close the speedivalve for that pump yesterday, but today with the trap warm no increase in pressure was seen at G1.
1410	Check contents of warm LN2 Trap 1, then pump out with scroll pump.
1411	Put trap 2 in LN2 bath and begin filling dewar.
1440	Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 11.5%
1445	Increase V6 → 11.7% to restart flow
1515	Increase V6 → 11.8% to speed up flow
1540	Stop cleaning through Trap 2 after 60 min. G2 flow pressure was 570-610 mbar. Pump mixture to dump. Removed 0.0 mbar. (because we started a second cleaning without pumping out from this cleaning.)
1613	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 11.4%
1618	Increase V6 → 11.6% to restart flow
1635	Increase V6 → 11.7% to speed up flow
1645	Increase V6 → 11.8% to speed up flow
1805	Stop cleaning through Trap 1 after 105 min. G2 flow pressure was 580-720 mbar. Pump mixture to dump. Removed 6.8 mbar.
1830	This time I remembered to close the valves and turn off the pump.