2014/02/05

0155	Fill N2 cold trap full.
0425	A quick statistical analysis of the positions of the 356 keV peak from the overnight Q = -4 V, P = 0 V data series is presented in Table 1. Crystal lost neutralisation very quickly, so only first 5 minutes of each data series are considered. Apart from data series 07140204_0350, the Q only mean positions lie within errors. The variance is rather low, so it is probably safe to assume that a 6 second flash is sufficient to restore neutralisation and there is no need to investigate this further.

0155

Fill N2 cold trap full.

0425

A quick statistical analysis of the positions of the 356 keV peak from the overnight Q = -4 V, P = 0 V data series is presented in Table 1. Crystal lost neutralisation very quickly, so only first 5 minutes of each data series are considered. Apart from data series 07140204_0350, the Q only mean positions lie within errors. The variance is rather low, so it is probably safe to assume that a 6 second flash is sufficient to restore neutralisation and there is no need to investigate this further.

Table 1: Positions of 356 keV peak in overnight Q = -4 V, P = 0 V data series.
Data Series	Q Only Mean	Q + P Mean
07140203_2310	0.01152 ± 0.00001	0.01251 ± 0.00001
07140204_0130	0.01151 ± 0.00001	0.01255 ± 0.00002
07140204_0350	0.01161 ± 0.00001	0.01264 ± 0.00001
07140204_0611	0.01152 ± 0.00001	0.01254 ± 0.00001
Mean	0.01154	0.01256
Variance	0.00022	0.00031
Standard Deviation	0.00005	0.00006

0445	Remove Ba-133 source and place final corner of shield in position. Start data acquisition: 2 files at each bias in following order: Q = -12 V, P = 0 V; Q = -12 V, P = -4.8 V; Q = -12 V, P = -12 V; Q = +12 V, P = 0 V; Q = +12 V, P = +4.8 V; Q = +12 V, P = +12 V. Initial flash for four hours, followed by 2-hour cooldown; acquisition/flash/cooldown = 5/0.1/20 minutes.
	Noticed that DAQ configuration file from Run 41 is using old, incorrect biases for 0 V. Corrected this for two files that shall be used tonight and saved in Run 45 folder.
1050	Fill LN2 cold trap full.
1300	DAQ ran into some trouble, spitting out errors. Can't be sure, but suspect this may be due to changing number of events per file while it was running. It appears as though this value is read out in quite a few places, and may have confused it. Use opportunity to remove DCRC31 for re-calibration on bench.
1405	Recalibrate DCRC31. Plug DCRC31 back into DIB 2 and commence data acquisition while crystal exposed to Ba-133 source: four 40-minute long data series at Q = -4 V, P = 0 V. Acquisition length chosen in attempt to ensure crystal is deneutralised before 6-second flahses. Initial flash for 6 hours followed by 2 hours cooldown. Final flash for 6 hours followed by 2 hours cooldown. Acquisition/flash/cooldown = 40/0.1/20 minutes.
2355	Fill N2 cold trap full.