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D. Elia, R. SantoroITS week / SPD meeting - May 12, 20041 Test beam data analysis D. Elia, R. Santoro – Bari SPD Group Alignments, plane rotation for setup.

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Presentation on theme: "D. Elia, R. SantoroITS week / SPD meeting - May 12, 20041 Test beam data analysis D. Elia, R. Santoro – Bari SPD Group Alignments, plane rotation for setup."— Presentation transcript:

1 D. Elia, R. SantoroITS week / SPD meeting - May 12, Test beam data analysis 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:

2 D. Elia, R. SantoroITS week / SPD meeting - May 12, Data samples Wide and focussed beam data with setup # 3:

3 D. Elia, R. SantoroITS week / SPD meeting - May 12, Alignments (I) mm Wide beam data zx plane Files: angle0_thXX_50k.dat

4 D. Elia, R. SantoroITS week / SPD meeting - May 12, Alignments (I) mm Useful region for tracking and efficiency estimation studies zx plane Files: angle0_thXX_50k.dat

5 D. Elia, R. SantoroITS week / SPD meeting - May 12, Alignments (II) mm Wide beam data zy plane Files: angle0_thXX_50k.dat

6 D. Elia, R. SantoroITS week / SPD meeting - May 12, Alignments (III) Focussed beam data zx plane zy plane Files: c0r0_tilt0_pre_vthXXX.dat

7 D. Elia, R. SantoroITS week / SPD meeting - May 12, 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 rad) visible improvement of Y residuals: rms(x) = 117 m (y) = 14.9 m

8 D. Elia, R. SantoroITS week / SPD meeting - May 12, 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:

9 D. Elia, R. SantoroITS week / SPD meeting - May 12, Residuals and resolution (II) Residuals for single pixel 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 VTH = 200

10 D. Elia, R. SantoroITS week / SPD meeting - May 12, Impacts vs cluster size Single-pixel cluster Double-x-pixel cluster Double-y-pixel cluster

11 D. Elia, R. SantoroITS week / SPD meeting - May 12, X-impacts vs cluster size Single-pixel VTH = 200 Double-x-pixel cluster

12 D. Elia, R. SantoroITS week / SPD meeting - May 12, X-impacts vs cluster VTH = 200 = 15 m

13 D. Elia, R. SantoroITS week / SPD meeting - May 12, Y-impacts vs cluster size Single-pixel cluster Double-y-pixel cluster

14 D. Elia, R. SantoroITS week / SPD meeting - May 12, Residuals vs threshold VTH=80 (y) = 16.6 VTH=120 (y) = 17.9 VTH=200 (y) = 14.9 VTH=214 (y) = 13.8 m Single-pixel clusters

15 D. Elia, R. SantoroITS week / SPD meeting - May 12, Residuals vs threshold (II) Double-y-pixel VTH=80 (y) = 21.0 VTH=120 (y) = 14.1 VTH=200 (y) = 13.6 VTH=214 (y) = 15.8 m

16 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (I) Following classification implemented: 14 = all other types

17 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (II) VTH = 200

18 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (III)

19 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (III)

20 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (IV) VTH=214 VTH=200

21 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (V) VTH = 214

22 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (VI) VTH=200 VTH=180

23 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (VII) VTH=140 VTH=120

24 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster type studies (VIII) VTH=100 VTH=60

25 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster size vs threshold VTH=90

26 D. Elia, R. SantoroITS week / SPD meeting - May 12, Cluster size vs threshold (II)

27 D. Elia, R. SantoroITS week / SPD meeting - May 12, 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 - efficiency: 99.9% - efficiency (5 sigma cut): 99.1%

28 D. Elia, R. SantoroITS week / SPD meeting - May 12, Efficiency studies (II) Clusters within 5 cuts Clusters out of 5 cuts

29 D. Elia, R. SantoroITS week / SPD meeting - May 12, Efficiency studies (III) Scan of the threshold: Files: c0r0_tilt0_pre_vthXXX.dat

30 D. Elia, R. SantoroITS week / SPD meeting - May 12, What next Check of the efficiency for wide beam data Tilt angle scan studies Look at the heavy ion data Bias scan studies


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