2015/02/27

1015	Fill LN2 cold trap.
1100	Cease pumping on 1K pot, mixing chamber temperature begins rising from ~1.2K. Turn on mixing chamber heater and commence pumping to dump.
1430	Stop pumping on fridge lines by closing gate valve and V6. Current pressures: G1: 1.0mbar, G2: 649mbar, P1: 7ubar.
1440	Restart 1K pot. 1K Pot temperature ~1.7K. Commence condensation procedure. G2 reads 649mbar. Aiming for 300mbar condensing, so G2 should read 349mbar.
1500	Finish condensing. G1 and G2 at ~75mbar. Lower 1K pot temperature from 1.74K to 1.56K. Commence circulation procedure.
1920	Finish recording fridge temperature on mixing chamber thermometer, still thermometer, cold plate thermometer, and RuOx mixing chamber thermometer to document oscillatory behavior. Plots shown in Figures 1-4. NOTE: RuOx mixing chamber thermometer only records resistance, but an increase in the magnitude (i.e. a smaller resistance) corresponds to a lower temperature.

Figure 1: Usual Mixing Chamber Temperature Plot	Figure 2: Still Temperature Plot

Figure 3: Cold Plate Temperature Plot	Figure 4: RuOx Thermometer Mixing Chamber Resistance Plot

1930	Cease circulating and perform single shot test. Small initial decrease, but then fridge temperature rises immediately. Pump rest of mixture to dump. Cease pumping on 1K pot to warm up fridge.
2240	Pressure in P1 6 μbar, G2 pressure 650 mbar. Most of the mixture appears to have been recovered. Close gate valve and condenser line speedivalve. Close valves V1 & V6 on IGH.
2310	Fill N2 cold trap full. Close valve V12A on IGH and nitrogen cold trap 1 speedivalve.