Etude de bruit de fond induit par les muons dans l'expérience ...

tel-00724955, version 1 - 23 Aug 2012
5
98 Analysis of Run 8
rate (event / 8 hr file)
24/11/2007 18/03/2008
98.8 d 98.8 d
rate (event / 8 hr file)
Figure 5.2: Rate of the muon veto per 8-hour file when the veto is closed, see text
for details. The rate is shown over time (left) from 24/11/2007 to 18/03/2008 and
as a histogram (right) with a Gaussian fit. The mean of the Gaussian fit is 0.173 Hz
(calculated rate from data is also 0.173 Hz).
t10µs t (10 10µs (10 µs) µs)
400
300
200
100
0
x10 3
x10
0 400 600 800 1000 1200 1400 1600
3
200
event number
t 10µs (10 µs)
a veto file
continuous timing during a run on s2
a run starts on s2 another run starts on s2
another veto file
event number
Figure 5.3: Timeline of the veto events during Run 8 (left) and zoomed on one
bolometer period (right). Since a bolometer run lasts ∼ 24 hours, there are typically
three 8-hour veto files to cover the same period.