2010/08/17
Run Diary
| 0102 | Start Am-241 run series 07100817_0102 |
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| 0109 | Fill N2 cold trap full |
| 0915 | Stop run 07100817_0102 at file number 44 Event 442239 |
| Series 07100817_0102 settings |
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| 0930 | Fill N2 cold trap full |
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| 1756 | Measure Rn by sending a triangle wave down the QET bias line and channel by channel to avoid DCRC calibration problems |
| Triangle wave IbIs measurement, the resistance values are meaning less due to an unknown factor in bias |
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| All data and matlab fig files can be found at here |
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| 1840 | Measure Tc channel by channel, now I can use HP3325A bias down to 1mV, which was 10mV. The bias current is 1.5uA peak to peak. Sin wave 50 Hz |
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| 2119 | Measured Tc all the channels. The temperature gradient can be controlled to some extent when heating up the tower; there is less control when cooling down the tower. If the Tc need to be measured precisely, the crystal and the thermometer need to be at equilibrium. |
| Tc measurement by send a sin wave channel by channel | ||
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| Channel | Tc (mK ) | Average (mK) |
| A2 | 87, 91.8, 87.8, 90.8, 87.4, 87.5, 92.2, 88 | 89.1 |
| B2 | 104.6, 104.6, 104.6, 104.1, 103, 104.3 | 104.2 |
| C2 | 88.2, 93.9, 88.3, 90.6, 88, 94 | 90.5 |
| D2 | 88.2, 87.8, 88.3 | 88.1 |
| 2130 | There is only 3.8% helium left in the fridge. Since the temperature can not be controlled precisely at the moment and Ic measurement are pretty much waiting for temperature to stabilize, I will not do the Ic measurement this time. Hopefully when temperature is controlled in close loop mode, the temperature waiting time can be reduced. |
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| 2133 | I'll warm up the fridge |
| Close needle valve, isolate 1K pot | |
| Pump mixture out of fridge from both ends and the cold trap | |
| Fill N2 cold trap full | |
| Switch He-4 pump exhaust to 'Exhaust' | |
| Power off DCRC |