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2013/01/28

0945 Filled LN2 cold trap.
1000 Fed Cricket 4 pellets.
1118 G1 and G2 seem to be running a bit high: 86 and 89 mbar, respectively.
1127 Unplugged switch completely and plugged it back in. Reconnected boards and powered them. Didn't have any trouble with the FET heater.
1143 G1 and G2 are now 91 and 93 mbar respectively. Mixing chamber temperature is 50.6 mK and slowly rising.
1209 Temperature stabilizing at 51.3 mK.
1210 Flashed LEDs on Dib 1 for 10 seconds. Board is still connected.
1212 Flashed LEDs on Dib 2 for 10 seconds. Board is still connected.
1248 FLashed LEDs on Dib 1 and 2 for 10 seconds. Made sure to go about stopping and starting flashing by having to stop and start contro vi several times to see if boards would disconnect. Boards are still connected.
1303 Zap SQUIDs on Dib 3.
1323 Should modify QET bias setting for Dib 3, Ch. B to -70 uA.
1328 Turn on mixing chamber heater to find Dib 3, Ch. B Tc's.
1506 Finish Tc measurement for Dib 3, ch. B.
1720 Begin LHe transfer (28.3%).
1830 End LHe transfer (72.2%).
1835 Fed Cricket 4 pellets.
1716 Flashed detector with both dibs. Same settings as before. Lasted for 10 seconds.
1850 Start taking Ba-133 data with 0.4096 ms trace length, SQUIDs locked but no QET bias applied, OR trigger on all charge channels at 40 ADC bins, -/+3 V bias. DIB 2 is detector 1, DIB 1 is detector 2 & DIB 3 is detector 3.
1900 Tested taking charge data. Seems to be okay. Ba-133 source is out.
2150 Stop taking Ba-133 data.
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).
Measure Tcs for Ch. C on DIB 2 using 100 mVpp triangle wave at 1000 Hz
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
C2 5 169 110 83 - 82.5 -
Measure Tcs for Ch. B on DIB 3 using 10 mVpp triangle wave at 100 Hz
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
B3 1 65 4.5 74.6 75.9 75.7 73.7