simulation results Paola Solevi 04112009 Energy distribution Run 1665 HL on trigger turned off Calibration with 1680 ET and 1681 IT 1 LYSO only selected Small tagger guarantees low energy hit are focused at the centre of the module ID: 779623
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Slide1
Compton Kinematics studies and simulation results
Paola Solevi04/11/2009
Slide2Energy distribution
- Run 1665, HL on trigger turned off.
- Calibration with 1680 (ET) and 1681 (IT).
1 LYSO only selected. Small tagger guarantees low energy hit are focused at the centre of the module.
Slide3General cluster overview with no selection
pp+63
keV
Slide4Cluster selection: amplitude [I]
By requiring only 1 cluster on the same layer of the fired LYSO (1
LYSO selected)
.
Run 01665
Selection for different energy ranges.
Slide5Cluster selection: amplitude [II]
By selecting
all clusters whose
amplitude is larger than a certain threshold
(
thres
= 150
adc
cnts
* E
1
/E
me
).
Run 01665
Selection for different energy ranges.
Slide6Cluster selection: # wls [I]
By requiring only 1 cluster on the same layer of the fired LYSO (1
LYSO selected)
.
Run 01665
Selection for different energy ranges.
Slide7Cluster selection: # wls [II]
By selecting
all clusters whose
amplitude is larger than a certain threshold
(
thres
= 150
adc
cnts
* E
1
/E
me
).
Run 01665
Selection for different energy ranges.
Slide8Cluster selection: # cluster [I]
By selecting
all clusters whose
amplitude is larger than a certain threshold
(
thres
= 150
adc
cnts
* E
1
/E
me
).
Run 01665
Selection for different energy ranges.
Slide9Energy distribution
Investigation of the reconstructed
z
coordinated for different energy ranges.
Run 01665
z
coordinate for 1 LYSO fired, in different energy ranges, using WLS in cluster selected by
N
cluster
=1. The shown distribution are obtained by selecting events on
layer 6
.
The larger is the energy, more WLS are fired and the reconstructed
z
gets continuous.
Increasing energy
Slide10Efficiency study
Investigation of the efficiency of the cluster selection criteria.
Run 01665
Energy
[
keV
]
# events
# clusters
#cluster after selection 1
#
cluster after selection 2
Ratio
I/II
50-100
8843
1608
1590
1592
99.8
100-150
12195
6434
6274
5993
104.7
150-200
13911
11426
10846
9825
110.4
200-250
11221
10658
9679
9097
106.4
250-300
8544
8603
7392
7444
99.3
300-350
8606
8974
7218
7778
92.8
350-400
5281
5582
4069
4645
87.6
400-450
16924
20704
12802
16323
78.4
450-500
51285
65541
36870
49811
74.0
500-550
1657
2128
1008
1471
68.5
Slide11Studying WLS cluster for different WLS thresholds
Run 01665
Dependence on the WLS
thr
of the number of events with no WLS fired.
Different
thresholds have been applied at WLS level: (20), 30, 40, 50 and 60
adc
counts.
Slide12Run 01665
50-100
Cluster selection: amplitude [I]
30
adc
cnt
s
40
adc
cnts
50
adc
cnts
60
adc
cnts
150-150
150-200
200-250
250-300
300-350
350-400
400-450
450-500
500-550
Slide13Run 01665
50-100
Cluster selection: amplitude [II]
30
adc
cnt
s
40
adc
cnts
50
adc
cnts
60
adc
cnts
150-150
150-200
200-250
250-300
300-350
350-400
400-450
450-500
500-550
Ratio bin to bin of cluster selected with and without a threshold applied.
Slide14Run 01665
Dependence on the WLS
thr
of the size of cluster in different energy ranges.
Cluster selection: #
wls
30
adc
cnt
s
40
adc
cnts
50
adc
cnts
60
adc
cnts
50-100
150-150
150-200
200-250
250-300
300-350
350-400
400-450
450-500
500-550
Slide15Run 01665
Dependence on the WLS
thr
of the number of cluster in different energy ranges.
Cluster selection: # cluster
30
adc
cnt
s
40
adc
cnts
50
adc
cnts
60
adc
cnts
50-100
150-150
150-200
200-250
250-300
300-350
350-400
400-450
450-500
500-550
Slide16Run 01665
Study of cluster multiplicity
30
adc
4
0
adc
50
adc
6
0
adc
0 cluster
1
cluster
2 cluster
Slide17“Cleaned up” simulation: LYSO (Lu = 72%) [1]
I cleaned the source code from all changes
done and the agreement with data is eventually good! Now changes have to be re-implemented
by comparing data and simulation step after step.
Small shift due to the calibration.
63
keV
is a bit under-estimated.
Slide18“Cleaned up” simulation: LYSO (Lu = 72%) [2]
Slide19Understanding the intrinsic radioactivity spectrum
Energy in LYSO with energy blurring: only 300, 200 and 63
keV
peaks are visible.
Υ3
Υ3-Kα
Υ2-Kα
Kα
Υ2
Υ1