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2013/01/25

0000 Start flashing detector: LEDs 1 & 2 on DIBs 1 & 2 only; usual settings (-0.6 mA current, 100 μs flash on time, 5 ms flash off time).
0020 Fill N2 cold trap full.
0852 Stop flashing detector (temperature was at 168.8 mK).
0855 Filled LN2 cold trap.
1005 Fed Cricket 4 pellets.
1341 Zapped SQUIDs via DCRC32 twice. Started pulser to take Tc measurements and saw there was trapped flux. Stopped pulser and board disconnected and VIs froze. Quit Labview.
Note that the same thing happened yesterday when stopping the pulser on DCRC32.
1439 After zapping the SQUIDs twice again there still seems to be trapped flux.
Switched to DCRC33 to see if the pulser problem occurred there. Test sending a signal down QET A and then stopped it - worked fine.
1545 No amount of zapping seems to be correcting the trapped flux on dib 2. I started the pulser just to be sure and when I stopped it the program froze.
1559 Unplugged cable from both board and switch. Re-started LabVIEW again. Re-powered DCRC32 and now zapping SQUIDs.
1711 Fed Cricket 5 pellets.
2257 Finished taking Tc measurements for Ch.'s A, B, D on Dib 2 with DCRC32. Used 10 mVpp wave at 100 Hz.
Restarted temp.txt and igh.txt files.
2300 Start flashing detector.
2310 Filled LN2 cold trap.
Initial mixing chamber temperature 51.2 mK. Measure Tcs for phonon channels on DIB 2 using 10 mVpp triangle wave at 100 Hz. Measurement for C2 was not taken.
Peak-to-Peak Amplitude [mV] Tc (T increasing) [mK ± 0.2 mK] Tc (T decreasing) [mK ± 0.2 mK]
Channel Output Gain Before Transition After Transition Start Stop Start Stop
A2 1 100 7.7 76.5 78.0 77.2 76.4
B2 1 92 5.4 77.9 78.5 78.3 77.3
D2 1 120 7.9 72.7 73.2 72.8 72.0