2019/10/28 (Monday)

Previous Day

	Status: IVC pumping over weekend. Mixture cryocleaned 1 time. Beginning 2nd attempt at Run 71 cooldown.
0900	Turbo pump on IVC = 25 nbar. IVC = 1 μbar with turbo valved out for several minutes.
0910	Check warm LN2 Cold Trap 1: 7.1 mbar. Pump out Trap 1.
0925	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.5%
0930	Increase V6 → 12.6% to restart flow
0935	Increase V6 → 12.7% to restart flow
0935	Increase V6 → 12.8% to speed up flow
0950	Pump IVC with leak detector, turbo valved out. IVC = 7.1 pbarL/s.
0950	Increase V6 → 12.9% to speed up flow
1005	Leak check IVC, squirting all joints. No increase in leak signal.
1025	Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 560-740 mbar. Pump mixture to dump. Removed 11.2 mbar.
1120	Check warm LN2 Cold Trap 1: 11.2 mbar. Pump out Trap 1.
1140	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.8% ← no, too high, pressure rises too high, start over.
1145	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.9%
1155	Increase V6 → 13.0% to restart flow
1200	Increase V6 → 13.1% to restart flow
1225	Increase V6 → 13.2% to speed up flow
1235	Increase V6 → 13.3% to speed up flow
1245	Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 560-880 mbar. Pump mixture to dump. Removed 8.8 mbar.
1445	Check warm LN2 Cold Trap 1: 8.8 mbar. Pump out Trap 1.
1505	Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.8%
1510	Increase V6 → 13.0% to restart flow
1520	Increase V6 → 13.1% to restart flow
1530	Increase V6 → 13.2% to restart flow
1551	Increase V6 → 13.3% to restart flow
1645	Stop cleaning through Trap 1 after 100 min. G2 flow pressure was 565-630 mbar. Pump mixture to dump. Removed 7.7 mbar.
1540	Check warm LN2 Cold Trap 1: 7.7 mbar. Pump out Trap 1.

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