Table of Contents
2010/07/29
Run diary
| 0933 | Stop overnight run 07100728_2249 at file number 75. Save the settings as Preset 3, load Preset 1 and start flashing |
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| Temperature during past 5 hours |
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| IGH at 0936 |
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| 1056 | Fill N2 cold trap full |
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| 1337 | Stop flashing |
| 1513 | We are at a point ready to take data. I saw a lot of noise showing up in the pulses when the heat gun for little blue is running. It's best to take data at night. I'll flash the detector again |
| 1513 flash settings |
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| 1800 | Stop flashing |
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| 1854 | Start and stop the run cause B has a large offset, adjust driver offset |
| 1856 | Start to take 4“ shield run |
| 07100729_1856 settings |
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| 2011 | Start series 07100729_2011 with 8” of neutron shield, DCRC settings same as 07100729_1856 |
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| 2138 | Start series 07100729_2138 with 2“ of polyethylene shield, DCRC settings same as 07100729_1856 |
| 2305 | Start series 07100729_2305 with no polyethylene shield, DCRC settings same as 07100729_1856 |
| 2410 | Stopped series 07100729_2305 |
Analysis
Cuts used:
% position cut cQin = 0.93 <= Qpart & Qpart <=1.07; cDel = (-50 < Xdel & Xdel <50) & (-50 < Ydel & Ydel <50 ); % fitting quality cut cQchi2 = QSOFchisq(detnum,0) < 9000 + Qsum.^2*0.21; % energy cut cE = 5 < Qsum & Qsum < 100; cPt = Pt > 5; cQsum = Qsum >5;
| Plot | Cut |
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| Qpart logstep | cDel & cPt & cQsum |
| Qsum linstep | cQin & cDel & cQchi2 & Pt |
| (Qsum, QSOFchisq) | cDel & cQin |
| (Qi, Qo) | cDel & cPt |
| (Xdel, Qi) | cDel & cQin & cQchi2 & cPt |
| Pt overall calibration | cDel & cQin & cQchi2 & cQsum & cPt |
| (Pt, Qsum) | cDel & cQin & cQchi2 |
| Phonon relative calibration | No cut |
| (Xdel, Ydel) | cQin & cQchi2 & cE(55<Qsum<65)', 'cQin & cQchi2 & cE & cAmDel' |
| (Xpart, Ypart) | 'cc = cDel & cQin & cQchi2 & cE', 'cc = cc & cAmDel' |
| Yield plot (Pt, Y=Qsum/Pt) | cDel & cQin & cQchi2 |
| Neutralization plot (Time, Y) | cAmDel & cQin & cQchi2 & cE(30<Qsum<90) |
| Neutralization plot (Time, Qsum) | cAmDel & cQin & cQchi2 |
Overnight Am-241 run 07100728_2249
Approximately 11 hour run to check neutralisation and obtain background neutron rate.
Polyethylene neutron shielding tests
Neutron rates and fluxes in the following two plots obtained with data taken in 1 hour Cf-252 runs with 0", 2", 4", & 8" of polyethylene shielding. Ambient neutron rate and flux obtained with data from overnight Am-241 run.
1 hour Cf-252 and Am-241 run with 0" polyethylene shield 07100729_2305
1 hour Cf-252 and Am-241 run with 2" polyethylene shield 07100729_2138
1 hour Cf-252 and Am-241 run with 4" polyethylene shield 07100729_1856
1 hour Cf-252 and Am-241 run with 8" polyethylene shield 07100729_2011
