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2013/01/07

1010 Filled LN2 cold trap.
Fed Cricket 4 pellets.
1014 Mixing chamber temperature: 52.5 mK. Success! However, when leaving yesterday for the night to let fridge cool, the resistance range wasn't switched high enough, so we can't see the rate of decrease of the fridge's temperature. It was stuck at 90 mK.
1045 Begin LHe transfer (4.1%).
1135 End LHe transfer (87.5%).
1322 Mixing chamber temperature: 52.6 mK.
Plugged in DCRC33.
1412 Thought switch wasn't working. It wasn't actually connected to the computer, but by the time I realized that I was already using the external PoE. So, board is being powered by external PoE.
Started clock.
1423 External PoE randomly disconnected. Temperature rose 0.7 mK in the meantime (and still creeping up).
Connection seems unstable. Keeps connecting and disconnecting.
1431 Re-connected board. Waiting to see if temperature levels off.
1448 Temperature has increased over 2 mK now, still increasing. Connection is finally stable. I think it takes awhile to reach this point.
1458 Temperature is fluctuating, but not going much higher than 54 mK.
1515 Temperature is stabilizing around 53.8 mK. Connection is still good.
1537 Begin tuning board (54 mK).
1548 Zap SQUIDs twice.
1608 Turning on test signal doesn't work. Not sure why. Board is powered, clock is started, and channels seem to be responding (perhaps a bit fast, but still seem fine).
1642 Filled LN2 cold trap full.
1700 fed Cricket 4 pellets.