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D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 1
Test beam data Test beam data analysisanalysis
D. Elia, R. Santoro – Bari SPD Group
Alignments, plane rotation for setup #3
Residuals and resolution
Cluster analysis
Efficiency study
Threshold scan studies
What next
Outline:Outline:
D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 2
Data samples
Wide and focussed beam data with setup # 3:
D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 3
Alignments (I)
- 4.850 mm
- 2.358
- 4.850
- 5.130
Wide beam data
zx plane
Files: angle0_thXX_50k.dat
D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 4
Alignments (I)
- 4.850 mm
- 2.358
- 4.850
- 5.130
Useful region for tracking and efficiencyestimation studies
zx plane
Files: angle0_thXX_50k.dat
D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 5
Alignments (II)
- 0.190 mm - 0.567- 0.870
0.560
Wide beam data
zy plane
Files: angle0_thXX_50k.dat
D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 6
Alignments (III)
Focussed beam data
zx plane
zy plane
Files: c0r0_tilt0_pre_vthXXX.dat
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Rotation of test plane
Fine tuning of the alignment for the test plane:- track prediction residuals centered on zero- small rotation angle found (xy plane 0.012 rad)
visibleimprovementof Y residuals:
rms(x) = 117 m(y) = 14.9 m
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Residuals and resolution (I)
Single pixel-clusters:
rms(x) = 121 m(y) = 14.9 m
(x) = 12.6 m(y) = 13.6 m
Double-pixel clusters:
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Residuals and resolution (II)
Residuals for singlepixel clusters:
rms(x) = 121 m(y) = 14.9 m
Spatial precision of the telescope (simulation): telescope 10 m
pixel(x) = 121 m pixel(y) = 11 m
@ VTH = 200
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Impacts vs cluster size
Single-pixel cluster
Double-x-pixel cluster
Double-y-pixel cluster
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X-impacts vs cluster size
Single-pixel cluster
@ VTH = 200
Double-x-pixel cluster
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X-impacts vs cluster size
@ VTH = 200
= 15 m
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Y-impacts vs cluster size
Single-pixel cluster
Double-y-pixel cluster
D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 14
Residuals vs threshold (I)
@ VTH=80
(y) = 16.6 m
@ VTH=120
(y) = 17.9 m
@ VTH=200
(y) = 14.9 m
@ VTH=214
(y) = 13.8 m
Single-pixel clusters
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Residuals vs threshold (II)
Double-y-pixel clusters
@ VTH=80
(y) = 21.0 m
@ VTH=120
(y) = 14.1 m
@ VTH=200
(y) = 13.6 m
@ VTH=214
(y) = 15.8 m
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Cluster type studies (I)
1 32 4 5
7
6
9 108
12
11
13
Following classification implemented:
14 = all other types
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Cluster type studies (II)
1 32 4 57
8
VTH = 200
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Cluster type studies (III)
1 32 4 57
8
910
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Cluster type studies (IV)
VTH=214
VTH=200
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Cluster type studies (V)
1 32 4 57
8
VTH = 214
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Cluster type studies (VI)
VTH=200
VTH=180
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Cluster type studies (VII)
VTH=140
VTH=120
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Cluster type studies (VIII)
VTH=100
VTH=60
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Cluster size vs threshold (I)
@ VTH=214 @ VTH=200 @ VTH=160 @ VTH=90
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Efficiency studies (I)
Event selection:- 1 cluster on each of the tracking planes
- track crossing the test plane- selection cuts: dx < 1.3 mm dy < 0.3 mm- for wide beam: 1 column looks less efficient (90%)
Results (@VTH=200):- efficiency: 99.9%
- efficiency (5 sigma cut): 99.1%
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Efficiency studies (II)
Clusterswithin5 cuts
Clustersout of5 cuts
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Efficiency studies (III)
Scan of the threshold:
Files: c0r0_tilt0_pre_vthXXX.dat