2018/05/23 (Wednesday)

Previous Day

	Status: Replaced 1K pot shaft orings. Cleaning mixture.
0854	IVC pressure = 5.4 mbar
1340	Pump out fridge lines with scroll pump.
1344	Let mixture from 3He pump through cold LN2 Trap 1 into fridge lines, both sides. (Most mixture still in dump.)
1350	Pump out main bath with scroll pump.
1353	Once P2 < 10 mbar, open 1K pot speedivalve. Open 1K pot needle valve 5 full turns.
1356	P2 = 0.4 mbar, close V1A and 1K pot speedivalve.
1401	Open V5A, V2A, vent speedivalve to pump out clear He hose. Close off scroll pump.
1405	Pressurize main bath and 1K pot with helium to 316 mbar above 1 atm on G3.
1406	Close 1K pot needle valve.
1413	Begin LN2 transfer
1420	MC(Cernox) = 291.8 K, IVC = 5.4 mbar, G1 (fridge) = 211 mbar, New level resistor = 2.163 kΩ
1430	MC(Cernox) = 290.2 K, IVC = 4.6 mbar, G1 (fridge) = 208 mbar, New level resistor = 2.269 kΩ
1450	MC(Cernox) = 273.9 K, IVC = 3.4 mbar, G1 (fridge) = 205 mbar, New level resistor = 2.884 kΩ
1505	MC(Cernox) = 249.8 K, IVC = 3.0 mbar, G1 (fridge) = 203 mbar, New level resistor = 2.996 kΩ
1520	MC(Cernox) = 230.2 K, IVC = 2.5 mbar, G1 (fridge) = 202 mbar, New level resistor = 3.005 kΩ
1540	MC(Cernox) = 209.7 K, IVC = 2.5 mbar, G1 (fridge) = 202 mbar, New level resistor = 3.005 kΩ
1600	MC(Cernox) = 199.4 K, IVC = 2.5 mbar, G1 (fridge) = 200 mbar, New level resistor = 3.005 kΩ
1625	MC(Cernox)/Sorb = 176.0/183.9 K, IVC = 2.2 mbar, G1 (fridge) = 199 mbar, New level resistor = 3.004 kΩ
1627	Open LN2 dewar valve open all the way. It was already quite open (~3 turns) though.
1632	Cease LN2 transfer. Started to hear LN2 splash out of the open main bath port.
1634	MC(Cernox)/Sorb = 170.2/175.1 K, IVC = 2.2 mbar, G1 (fridge) = 197 mbar, New level resistor = 2.999 kΩ
1800	Fill LN2 cold trap full

Cryocleaning mixture
0858	Check pressure in warm Trap 1: 28.2 mbar. Pump out with scroll pump
0905	Start cleaning mixture through cold LN2 Trap 2, V6 = 12.9%
0909	Increase V6 to 13.0% to speed up circulation
0912	Increase V6 to 13.1% to speed up circulation
0920	Increase V6 to 13.2% to speed up circulation
0955	Stop cleaning trap 2, 50 min
1012	Start cleaning mixture through cold LN2 Trap 1, V6 = 13.1%
1016	Increase V6 to 13.3% to speed up circulation
1102	Stop cleaning trap 1, 50 min
1115	Check pressure in warm Trap 2: 7.9 mbar. Pump out with scroll pump
1127	Start cleaning mixture through cold LN2 Trap 2, V6 = 13.1%
1129	Increase V6 to 13.2% to speed up circulation
1132	Increase V6 to 13.3% to speed up circulation
1135	Increase V6 to 13.4% to speed up circulation
1217	Stop cleaning trap 2, 50 min
1235	Check pressure in warm Trap 1: 12.2 mbar. Pump out with scroll pump
1332	Check pressure in warm Trap 2: 4.3 mbar. Pump out with scroll pump

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