2019/05/06 (Monday)

Previous Day

Status	Room temperature, after second blockage. IVC and cryostat vacuum jacket pumped out.
Setup	DIB1/3/4 → 3.2 MHz filters 2/3/1 → cable 3/1/2
0835	Fill LN2 cold trap bath
0840	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.8%
0850	Increase V6 → 13.0% to restart flow
0900	Increase V6 → 13.1% to speed up flow
0925	Increase V6 → 13.2% to speed up flow
0940	Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 570-680 mbar. Pump mixture to dump. Removed 5.9 mbar.
1000	Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 13.3%
1100	Stop cleaning through Trap 2 after 60 min. G2 flow pressure was 570-750 mbar. Pump mixture to dump. Removed 5.2 mbar.
1145	LN2 Trap 1 is warm. Check contents: 7.6-1.7 = 5.9 mbar on G1. Pump out with scroll pump.
1200	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.9%
1205	Increase V6 → 13.0% to restart flow
1210	Increase V6 → 13.1% to speed up flow
1245	Increase V6 → 13.2% to speed up flow
1300	Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 580-800 mbar. Pump mixture to dump. Removed 12.6 mbar.
1310	LN2 Trap 2 is warm. Check contents: 6.9-1.7 = 5.2 mbar on G1. Pump out with scroll pump.
1325	Check fridge pressures: LHe trap/Condenser/Still = 0.4/0.3/0.07 mbar. Pump out with scroll pump.
1350	LN2 Trap 1 is mostly warm. Check contents: 14.7-2.1 = 12.6 mbar on G1. Pump out with scroll pump.
	why so high?? I think we should keep cleaning today, wait until tomorrow to transfer LN2.
1405	Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 12.7%
1410	Increase V6 → 12.9% to restart flow
1420	Increase V6 → 13.0% to speed up flow
1525	Stop cleaning through Trap 2 after 80 min. G2 flow pressure was 570-690 mbar. Pump mixture to dump. Removed 4.6 mbar.
1545	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 13.3%
1705	Stop cleaning through Trap 1 after 80 min. G2 flow pressure was 575-750 mbar. Pump mixture to dump. Removed 4.7 mbar.
1720	LN2 Trap 2 is warm. Check contents: 6.3-1.7 = 4.6 mbar on G1. Pump out with scroll pump.
1730	Open dump to cold LN2 Trap 2 to leave overnight. 3He pump on, v4, v9, v13b, v12b+speedivalve all open. This opens both sides of dump to both sides of trap.

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