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2013/03/04

1010 Filled LN2 cold trap.
1015 Stop flashing detector.
1020 Fed Cricket 4 pellets.
1715 Filled LN2 cold trap.
Figure 1: IbIs for Phonon Channel C2 at 73 mK.
Table 1: Dib 2 Tc Measurements
Peak-to-Peak Amplitude [mV] Tc (T increasing) [mK ± 0.2 mK] Tc (T decreasing) [mK ± 0.2 mK]
Channel Side Output Gain Before Transition After Transition Start Stop Start Stop
C2 2 1 150 9 84.5 85.2 85.3 84.0
1959Fed Cricket 4 pellets.
2044 After doing Tc measurements and turning off mixing chamber heater, the temperature lowered to 79.5 mK and started to rise again. Current mixing chamber temperature is 82.4 mK.
Pressures in G1 and G2 have also risen: G1 = 336 mbar, G2 = 308 mbar; They have been rising for at least hour.
P1 = 0.036 mbar; LHe = 6.6%; Perhaps the helium level contributed to this, since the cold trap is partway out of the bath.
2045 Closed V13a, and opened V9. Mixing chamber temperature continued to increase. This suggests that mixing was not occurring in mixing chamber right before this.
2050 Temperature seems to be decreasing slightly. Perhaps there is too much He3.
2100 Temperature is lowering very slowly. Turn on mixing chamber heater and open V5. Also turn off 1K pot.
There's a very strong vibration in the fridge and a lot of pressure in the main bath. The gas meter also showed no recovery. Released some pressure by removing the bung. We'll check on the vibration again later.
2103 Stopped 1K pot.
2304 Removed lead-poly shield.
2344 Lowered main bath.