2012/12/05
| 0936 | Checked the mixing chamber temperature. Currently at 81.1 mK. However, looking at the temperature history, there was a spike at 0730 that immediately dropped, but the temperature was around 85-88 mK for at least an hour after. There was another increase in temperature at 2130, which coincidentally happened right after I left lab last night. Not sure what these increases in temperature are due to. |
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| 1000 | Filled LN2 cold trap. |
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| 1318 | Begin LHe transfer (8.7%). |
| 1410 | End LHe transfer (93.2%). |
| Time | P1 (mbar) | P2 (mbar) | G1 (mbar) | G2 (mbar) | Mixing Chamber (mK) | Still (kOhms) | Cold Plate (kOhms) | 1 K Pot (K) |
|---|---|---|---|---|---|---|---|---|
| 1505 | 0.055 | 9.5 | 62.2 | 60 | 68.7 | 4.41 | 13.5 | 1.57 |
| 1549 | 0.060 | 30 | 67.8 | 65.2 | 71.3 | 4.37 | 13.7 | 1.68 |
| 1030 | Fed Cricket 3 pellets. |
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| 1624 | Mixing chamber temperature spiked suddenly to 82.5 mK. Decreasing again. This was strange. After making the last adjustment to the 1 K pot temperature, the mixing chamber temperature decreased then increased like expected. As it leveled out, the spike in temperature occurred suddenly. |
| 1715 | Fed Cricket 4 pellets. |
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| Time | P1 (mbar) | P2 (mbar) | G1 (mbar) | G2 (mbar) | Mixing Chamber (mK) | Still (kOhms) | Cold Plate (kOhms) | 1 K Pot (K) |
|---|---|---|---|---|---|---|---|---|
| 1745 | 0.065 | 70 | 73.7 | 72.9 | 72.9 | 4.36 | 13.6 | 1.74 |
| 1803 | Now going to add some power to the still. |
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| Time | Power (uW) | P1 (mbar) | P2 (mbar) | G1 (mbar) | G2 (mbar) | Mixing Chamber (mK) | Still (kOhms) | Cold Plate (kOhms) | 1 K Pot (K) |
|---|---|---|---|---|---|---|---|---|---|
| 1834 | 1 | 0.08 | 65 | 79.5 | 80.7 | 79 | 4.33 | 13.6 | 1.74 |
| 1910 | 2 | 0.09 | 65 | 86.2 | 87.8 | 85 | 4.30 | 13.6 | 1.75 |
| 1943 | 3 | 0.10 | 70 | 92.9 | 94.9 | 89 | 4.28 | 13.6 | 1.75 |
| 1944 | Still is too warm and still pressure has reached 0.1 mbar. Turning off still heater. |
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| 1950 | Filled LN2 cold trap. |