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2011/05/10

0010 Start data series: 07110510_0009; +3 V bias DIB1; -3 V bias DIB2; trace length 1024 bins (ie. 409.6 ns: ¼ of what is normally implemented); Ba-133 source 13” below top of mu-metal shield; 40 ADC bins trigger threshold on Qi channels; charge-only.
0055 Fill N2 cold trap full.
0120 Stop data series 07110510_0009 on file 12.
Start flashing detector.
1515 Stop flashing detector.
1525 Fill N2 cold trap full.
Tower temperature is falling very slowly. Increase still heater power to 2.0 mW to improve circulation.
1835 Start data series: 07110510_1834; -2.5 V bias DIB1; +2.5 V bias DIB2; trace length 1024 bins; Ba-133 source 13“ below top of mu-metal shield; 40 ADC bins trigger threshold on Qi channels; charge-only.
1910 Stop data series 07110510_1834 on file 7.
Start flashing detector.
1950 Stop flashing detector.
2050 Cool detector for 55 minutes until tower temperature drops below 60 mK.
Start data series: 07110510_2046; complements 07110510_1834.
2130 Stop data series 07110510_2046 on file 9.
Start flashing detector.
2210 Stop flashing detector.
2310 Start data series 07110510_2307; complements 07110510_1834 & 07110510_2046.
2340 Stop data series 07110510_2307 on file 7.
Start flashing detector.

Looking for Neutralisation

Figure 1: First data series 07110510_1834.
Figure 2: Second data series 07110510_2046.
Figure 3: Third data series 07110510_2307.