2013/03/14 · UMN CDMS Wiki archive

1010	Filled LN2 cold trap.
1020	Fed Cricket 4 pellets.
1106	The pressure in G1 and G2 have started rising again, and the mixing chamber temperature is dropping.
1122	Close gate and condenser valves. Then close V13A and open V5. Then open V12B.
1418	Stopped 1K pot and He recovery.
1434	Pulled out He cold trap. As it warmed, began pumping on it. Pulled out LN2 cold traps. Letting them warm a bit, then begin pumping.
1745	Finish 3 rounds of cold trap cleaning.
1800	Fed Cricket 4 pellets.
1836	Close all valves on IGH.
1852	Returned cold traps to baths.
1905	Start 1 K pot and He Recovery
1924	Begin LHe transfer (35.1%).
2015	End LHe transfer (90.9%).
2041	Open gate and condenser valves. Open V1, V13A, and V12A. Open V6 gradually.
2117	Opened V6 all the way.
2135	Filled LN2 cold trap.

Discussion of data
There is a large collection of events in the electron-collecting side towards Qo. Checking the DAQ files, nothing seems to be amiss. Bias was entered for Qi/Qo on both sides of the detector and had opposite polarities for the two sides. The LED value is correct, and the temperature history showed that flashing had occurred. This behavior does not match G101b data from Run 28. The charge pulses on both boards look fine. The Qi trigger threshold for Dib 1 is 30 ADC bin, while the threshold on Dib 2 is 35 ADC bin. Considering that the low statistics corresponds to the side that is positively biased, I am not concerned about the trigger threshold in this scenario.

Discussion of data

There is a large collection of events in the electron-collecting side towards Qo. Checking the DAQ files, nothing seems to be amiss. Bias was entered for Qi/Qo on both sides of the detector and had opposite polarities for the two sides. The LED value is correct, and the temperature history showed that flashing had occurred. This behavior does not match G101b data from Run 28.
The charge pulses on both boards look fine. The Qi trigger threshold for Dib 1 is 30 ADC bin, while the threshold on Dib 2 is 35 ADC bin. Considering that the low statistics corresponds to the side that is positively biased, I am not concerned about the trigger threshold in this scenario.

+/-3 V for Dib 1/2	-/+ 3 V for Dib 1/2

Individual Charge Spectra (only threshold cut → Qi/Qo > 0.25 )

Not all of the low energy peaks trouble me. Just the Qi sides where electrons are being collected.

Charge vs. Time (threshold cut)

The Ba-133 line is faint, but it lasts the whole half hour.

Chi2 vs. Charge (threshold cut)

Qpart (threshold cut)

It is these plots signify the trouble to me. It seems that on the side collecting electrons, we not only get much fewer statistics than the hole-collecting side, but there are predominantly more Qo events.

Qsum (threshold cut)

Alex is working on focusing on on the low energy end of these spectra. However, initial looks suggest that we can't see Pb-210 peaks.

QZpart (threshold cut and limitation on QZpart range)

A quick look at the QZpart plot shows that we don't have a significant shift towards -1.

Qsum1 vs. Qsum2 (threshold cut and limitation on Qsum1 and Qsum2 range)

One of the figures was zoomed in on to have a better look at the 60 keV region.