2016/06/01 (Wednesday)

Status:	LN2 in MB, cooling overnight. Both cold traps at room temperature.
0800	MC = 77.4 K, Sorb = 131 K, IVC = 1.9 mbar. Sorb slowly warming, about 3 K in the last 10 hours.
0825	Pump out both LN2 cold traps. Each has around 0.5 mbar.
0835	Put LN2 cold traps into bath
0840	Begin blowing out LN2 from MB into cold trap bath. G3 (bath pressure) rises to 400 mbar relative, adjust He cylinder regulator valve so G3 falls below 350 mbar. Settles at about 300 mbar.
0915	Pump IVC down to 4.6e-2 mbar (He exchange gas)
0915	G3 (main bath) drops to 150 mbar, probably the LN2 removal is almost finished
0925	G3 (main bath) drops again to 115 mbar
0935	Pump out main bath. After about 7 minutes P2 falls below 1 mbar.
0950	Pressurize MB with He gas to 240 mbar relative on G3.
0955	MC = 79.7 K, Sorb = 142 K

Through-Put Test Modifications:

Before Step 6: put LN2 traps into bath and fill with LN2 (e.g. Trap 1)
Step 6: Open V9, V13a, V11a, V8, V3; this lets mixture out of the dump through the cold trap to settle in the lines, so wait for G1 and G2 to stabilize. (Optionally 3He pump can be on so that all mix is pushed out of pump.)
Step 7: At the first sign that G1 and G2 have stabilized, close V8 and V3; open V1 immediately after.

1000	Perform throughput test with the above modifications, so that mixture goes through cold trap before entering fridge.
	Throughput = 45 mbar/minute. G1 reached minimum of 60 mbar with G2 at 615 mbar.
1010	Pump mixture from fridge to dump
1015	Pump Trap 1 contents to dump
1020	Evacuate 1K Pot. There was a lot of gas in it, above the P2 maximum.
1030	Was about to start LHe transfer but we need to wait for the 250L Dewar to fill. MC = 81.8 K, Sorb = 150 K
1300	LHe arrives. MC = 92 K, Sorb = 173 K
1305	Commence LHe transfer (-1.0%).
1309	Commence cryocleaning through cold trap 1.
1335	Sorb peaks at 178 K then starts to decrease
1350	MC peaks at 95.6 K then starts to decrease
1415	MC = 93 K, Sorb = 155 K, IVC = 4.0e-2 mbar
1500	MC = 66 K, Sorb = 59 K, IVC = 1.4e-2 mbar
1535	MC = 50K, Sorb = 7K, IVC = 8.6e-3 mbar. Cease cryocleaning, and pump mixture back to dump.
1545	MB level meter begins to register LHe in bath
1633	Stop pumping to dump with 794 mbar in the dump.
1635	Pump out lines leading up to Cold Trap 1 via P2 lines. Isolate pump, and open V7 and V11A to connect cold trap 1 to P2. Pull Cold Trap 1 out of LN2 bath to warm up.
1640	MC = 19K, Sorb = 5.5K. Open up turbopump to IVC to pump out exchange gas.
1723	End LHe transfer (92.1%).
1735	Release pressure from Main Bath. Since Cold Trap 1 is still sitting out to warm up and Cold Trap 2 had been pumped clean yesterday, I'm not going to fill the LN2 bath.