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2013/09/30

0015 Mixture left in dump 336 mbar; 350 mbar (dump pressure) of mixture in fridge. Open valve V12A on IGH to 100%. Manual condensation procedure complete. Mixing chamber temperature 7.3 K and falling.
0125 Commence helium transfer. Helium liquid level 17.8%.
0210 Cease helium transfer. Helium liquid level 92.1%.
1044 Filled LN2 coldtrap full.
1420 Begin circulation procedure (V6 starts at 12.5%). Mixing chamber temperature at 1.85 K.
1600 End circulation procedure (V6 fully open). Mixing chamber temperature at 80 mK.
1700 Mixing chamber temperature stabilized to 60.8 mK. Reduced 1K Pot temperature to 1.63 K.
1825 Mixing chamber temperature stabilized at 57.1 mK. Begin still heater tests.
Noticed that G2 has stabilized around 73 mbar and G1 has stabilized around 56 mbar, suggesting that the current cold trap in use (cold trap 1) is dirty.
Still Heater Power [mW ± 0.05 mW] H35 Thermometer [mK] Still pressure [μbar] Still Thermometer [kΩ ± 0.01 kΩ] Cold Plate Thermometer [kΩ ± 0.01 kΩ]
0 57.1 ± 0.05 60 ± 2.5 4.62 17.46
1 59.0 ± 0.05 75 ± 2.5 4.56 17.01
2 60.7 ± 0.05 90 ± 2.5 4.51 16.73
3 63.1 ± 0.05 100 ± 5 4.50 16.54
4 64.8 ± 0.05 110 ± 5 4.48 16.39
5 65.7 ± 0.05 130 ± 5 4.44 16.29
2330 Fill N2 cold trap full.