2012/10/30

0005	Give DIB 2 SQUIDs another zap.
0010	Fill N2 cold trap full.
	Pressures in G1 & G2 are 66 mbar & 60 mbar respectively. It doesn't look like blockage in helium trap is getting any worse. Cryostat seems to be performing well under the circumstances.
0025	Start data acquistion, triggering on charge channels with 0.1 ms trigger delay and 0.4096 ms trace length. OR charge trigger threshold 40 ADC bins for all charge channels, and coincidence time set to 10 μs. Flash for one hour, followed by cool down for 2 hours. Then take four 30-minute data series each at +/-2.5 V & -/+2.5 V biases. Flash all LEDs for 6 seconds between data series with usual settings, and wait 20 minutes for cryostat to cool. Finish with a 20 minute flash and 2-hour cool down.
	Rate of data acquisition is very low at around 1 Hz - not sure why. Phonon pulses look alright, although only saturated pulses show up. Timing link appears to be up and running. Reading charge trigger threshold readings from the boards confirms that its level is 40 ADC bins (0x0028). Everything looks correct on DAQDAQ2 vi. Maybe everything is fine.
1000	Filled N2 cold trap.

Relative Phonon Calibration

For side one the channels are labeled as follows: a1=blue, b1=red, c1=green, c2=black, d2=yellow, c3=cyan; (c2 is not present on the second graph) For side 2 the convention is: d1=blue, a2=red, b2=green, a3=yellow, b3=black, d3=cyan. The power is computed using the formula: P=152.6/50*V_out*I_bias (uW), where 152.6 is the coefficient converting ADC bins to uV and 50 is the ratio of resistances. The first four graphs correspond to data series 07121014_0839 (same for all graphs) and the event number is 10507

Side 1	Side 2


Side 1	Side 2


Side 1	Side 2


Side 1	Side 2