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2018/04/09 (Monday)

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Status: IVC open. Mixture cleaned twice. Cryostat vacuum jacket pumped out. 3He pump open to cold LN2 Trap 1 overnight (but dump isolated)
0925 Fill LN2 cold trap bath
1000 Pump mixture out of LN2 Trap 1 to dump. Remove Trap 1 from bath to let it warm up.
1035 Check pressure in warm LN2 Trap 2: 12.8 mbar. This trap was exposed to the mixture in the dump Friday night. Pump out with scroll pump.
1320 Check pressure in warm LN2 Trap 1: 6.8 mbar. This trap was exposed to the mixture in the pump from Saturday through this morning. Pump out with scroll pump.
1335 Start cryocleaning mixture through cold LN2 Trap 2, V6 = 12.4%
1340 Increase V6→ 12.7% to restart flow
1355 Increase V6→ 13.0% to restart flow
1415 Remove tower from fridge and put it in cleanroom anteroom.
1445 Stop cryocleaning mixture through trap 2, 70 minutes. Pump mixture to dump.
1600 Start cryocleaning mixture through cold LN2 Trap 1, V6 = 13.0%
1610 Increase V6→ 13.2% to restart flow
1700 Stop cryocleaning mixture through trap 1, 60 minutes. Pump mixture to dump.
Cryocleaning log
date trap duration (minutes) contaminants removed (mbar)
Apr 6 1 70 9.5
Apr 6 2 70 6.6
Apr 6 1 70 11.0
Apr 6-7 2 overnight, no circ, dump exposed to trap 12.8
Apr 7-9 1 overnight, no circ, pump exposed to trap 6.8
Apr 9 2 70 8.9
Apr 9 1 60 9.0

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