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2011/04/27

1230 Start circulation.
1245 Fill N2 cold trap full.
1345 Start flashing detector. LEDs 1 & 2 on both DIBs; 0.6 mA current, 100 μs on, 2.5 ms off. Tower temperature rises from 80 mK to 850 mK.
1445 Tower temperature has increased to >2 K. Not sure why. Temperature monitor indicates that temperature remained at around 850 mK for some time before rising to this level. Stop flashing detector to see if this fixes things.
1505 Improves the situation slightly, but tower temperature is still too high at 900 mK.
Open needle valve to 1 K pot to allow more helium in. Temperature of 1 K pot rises from 1.45 K to 1.75 K. Tower temperature has now dropped below 300 mK.
1515 Close needle valve such that temperature of 1 K pot falls to 1.6 K. Tower temperature has dropped to 140 mK.
1600 Start LHe transfer.
1610 Tower temperature rose to 103 mK, and then dropped as transfer started. Currently at 77.5 mK and falling pretty rapidly.
1650 Stop LHe transfer. Helium liquid level 93.7%.
Tower temperature 66.3 mK, falling slowly.
1755 Start flashing detector. LEDs 1 & 2 on both DIBs; 0.6 mA current, 100 μs on, 2.5 ms off. Tower temperature rises from 64 mK to 850 mK.
1815 Stop flashing detectors.
2200 Jeter sent 3 versions of the DAQ code today. Both have some issues. Trigger settings Qi 40 ADC bins and Qo 27 ADC bins on both DIBs.
Version 2 collects random triggers, but stops shortly afterwards and spits out a 'Memory is Full' error after a few seconds.
Version 3 does not get this far, and produces an error with the global trigger queue.