2012/02/14

0910	Temperature come back down. I'll take some data in the morning.

0926	Can see oscillations of the 1K pot temperature. Open the bath to air and 1K pot pump to exhaust to decouple the 1K pot from the bath.
	1K pot temperature tends to converge after decoupling the 1K pot pump from the bath. Isolate bath from air. 1K pot seem to be stable.

0935	Tower temperature dropped a little bit, at 80mK now.
0937	Start 0V test run.
	Event rate ~6Hz. Found connection to DCRC33 was lost some time ago.
0943	Checked and fixed trigger thresholds and synchronization.
	Start taking data 07120214_0944_F0001. +1V with Ba source. Tower temperature 80mK.
0947	Some of the pulses on Q1 and Q3 are upward. It doesn't happen on Q2 and Q4. Kind of strange.
0953	1K pot temperature still fluctuates.
1001	Filled LN2 cold trap
1158	Stop the run after 3 series of +1V data. The detector may need some flashing. I'll flash for one hour and then take data again.
1211	Tower temperature went up to 420mK while flashing. Could not get the LEDs on DCRC33 to work. Checked the 15V charge amp power supply is on.
1833	Always see both polarities of pulses on DCRC33 for +1, +3V biases. I suspect the electrodes on DCRC33 are not biased.
	Stop taking data. Cycle power of DCRC33. Now the pulse polarities change with the bias. Cycle the power of DCRC32 too.
	The data taken from this morning may suffer from the faulty mode of DCRC33.
1845	Checked the timing link and trigger thresholds.
1846	Start taking 07120214_1846_F0001. First series of +1V Ba data. Will take +3, +5, +7, +9, +10V data after, 3 series at each bias.
1900	Filled LN2 cold trap.