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

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 7

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

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 8

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:

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 9

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

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 10

Impacts vs cluster size

Single-pixel cluster

Double-x-pixel cluster

Double-y-pixel cluster

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 11

X-impacts vs cluster size

Single-pixel cluster

@ VTH = 200

Double-x-pixel cluster

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 12

X-impacts vs cluster size

@ VTH = 200

= 15 m

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 13

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

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 15

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

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 16

Cluster type studies (I)

1 32 4 5

7

6

9 108

12

11

13

Following classification implemented:

14 = all other types

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 17

Cluster type studies (II)

1 32 4 57

8

VTH = 200

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 18

Cluster type studies (III)

1 32 4 57

8

910

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 19

Cluster type studies (III)

6 11

12

13

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 20

Cluster type studies (IV)

VTH=214

VTH=200

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 21

Cluster type studies (V)

1 32 4 57

8

VTH = 214

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 22

Cluster type studies (VI)

VTH=200

VTH=180

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 23

Cluster type studies (VII)

VTH=140

VTH=120

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 24

Cluster type studies (VIII)

VTH=100

VTH=60

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 25

Cluster size vs threshold (I)

@ VTH=214 @ VTH=200 @ VTH=160 @ VTH=90

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 26

Cluster size vs threshold (II)

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 27

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%

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 28

Efficiency studies (II)

Clusterswithin5 cuts

Clustersout of5 cuts

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 29

Efficiency studies (III)

Scan of the threshold:

Files: c0r0_tilt0_pre_vthXXX.dat

D. Elia, R. Santoro ITS week / SPD meeting - May 12, 2004 30

What next

Check of the efficiency for wide beam data

Tilt angle scan studies

Look at the heavy ion data

Bias scan studies