Results from the SPD test beam data analysis D. Elia, R. Santoro (Bari)

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D. Elia, R. Santoro ALICE week / Offline meeting - March 15, 2004 1 Results from the SPD Results from the SPD test beam data analysis test beam data analysis D. Elia, R. Santoro (Bari) Look at the proton/pion beam data: test beam setup clustering analysis alignment resolution studies

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Results from the SPD test beam data analysis D. Elia, R. Santoro (Bari). Look at the proton/pion beam data: test beam setup clustering analysis alignment resolution studies. SPD Testbeam Setup (In-beam). Half stave. Pb-Target. Mini bus 1. beam. Middle plane. Mini bus 0. - PowerPoint PPT Presentation

Transcript of Results from the SPD test beam data analysis D. Elia, R. Santoro (Bari)

Page 1: Results from the SPD test beam data analysis D. Elia, R. Santoro (Bari)

D. Elia, R. Santoro ALICE week / Offline meeting - March 15, 2004 1

Results from the SPDResults from the SPDtest beam data analysistest beam data analysis

D. Elia, R. Santoro (Bari)

Look at the proton/pion beam data:

test beam setup clustering analysis alignment resolution studies

Page 2: Results from the SPD test beam data analysis D. Elia, R. Santoro (Bari)

D. Elia, R. Santoro ALICE week / Offline meeting - March 15, 2004 2

2003 Beam Test Setup (I)

SPD Testbeam Setup(In-beam)

Table

MWPCQuartz Scintillators

Mini bus 0

Pb-Target

Table: 150 cm

beamMini bus 1

Middle plane

Half stave

158 GeV/A In ion beam ≈ 104 ions/spill (15 days) Pb target 4mm thick120 GeV protons (3 days)

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Target: 4 mm PbTrigger: quartz counter (beam) + 2 cm x 2 cm scintillator (interactions)Mini bus 0, 1: 2 singles chip for mini bus mounted in crossed way to have the short pixel size in X-Y directionMiddle plane: single chip under study Half-stave read out through MCM including optical module 2.8 GB of data collected

2003 Beam Test Setup (II)

Half-staveTarget Mini bus 0

Mini bus 1

Middle plane

Page 4: Results from the SPD test beam data analysis D. Elia, R. Santoro (Bari)

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Proton data samples/setup

Data taken with 120 GeV/c proton/pion beam:

Setup

Focussed and wide beam data available

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Hit maps (focussed beam)

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Hit distributions

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Cluster analysis (I)

Cluster definition: group of fired pixels sharing a common side

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Cluster analysis (II)

Cluster size: number of fired pixels in the cluster

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Cluster analysis (II)

Cluster size: number of fired pixels in the cluster

Cluster dimx,y: x and y dimensions of a box containing the cluster:

dimx

dim

y

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Alignment procedure (I)

Select events with 1 cluster in each of the minibus planes

Do alignment within each minibus by using best x/y coordinate for each of the planes

Correlation plotsfor the 1st minibus

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D. Elia, R. Santoro ALICE week / Offline meeting - March 15, 2004 12

Alignment procedure (II)

Correlation plotsfor the 2nd minibus

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Alignment procedure (III)

Correlation plotsminibus planes aligned

Page 13: Results from the SPD test beam data analysis D. Elia, R. Santoro (Bari)

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Alignment procedure (IV) Final step: alignment between the 2 minibus

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Resolution study (I)

Select events with 1 cluster in each of the minibus planes

Apply least squares fit by using the 4 minibus planes points with proper weights

Calculate residuals

on middle plane:

(x) = 110 m(y) = 21 m

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Resolution study (II)Selecting cluster size = 1on middle plane:

rms(x) = 127 m(y) = 21 m

(x) = 42 m(y) = 20 m

Selecting cluster size = 2on middle plane:

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What next

Better understanding of alignment and resolution (geometrical simulation available)

Cluster analysis vs: threshold/bias/angle scans

Efficiency studies vs: threshold/bias/angle scans

Look at the HI data