Khaled Belkadhi (LLR-Ecole Polytechnique)1 DHCAL Test Beam Results using Full Train Reconstruction Khaled Belkadhi.

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Presentation transcript:

Khaled Belkadhi (LLR-Ecole Polytechnique)1 DHCAL Test Beam Results using Full Train Reconstruction Khaled Belkadhi

The Test Beam Efficiency study Time cuts for tracks reconstruction Tracks reconstruction without position cuts Tracks reconstruction with position cuts Efficiency map Conclusion Khaled Belkadhi (LLR-Ecole Polytechnique)2

3 The TestBeam Khaled Belkadhi (LLR-Ecole Polytechnique)3  TestBeam at CERN (PS)  July-August 2008: 4 RPC 32×8 cm2  November 2008: 5 RPC 32×8 cm2 (with one multi-gap RPC) RPC: 4 Asics Asic: 64 Channels Scintillators: Trigger  Read recorded events

Khaled Belkadhi (LLR-Ecole Polytechnique)4 The TestBeam Full Train Time Distribution (all events) Time (ms)

Khaled Belkadhi (LLR-Ecole Polytechnique)5 Efficiency Study Efficiency = Probability to find a track reconstructed on 3 layers in the 4th layer ?

Khaled Belkadhi (LLR-Ecole Polytechnique)6 Time Correlation between hits in Asics 6 Time Cuts

RUN 153: cut at -400 ms (spill length) First spill Second spill Khaled Belkadhi (LLR-Ecole Polytechnique)7 Time Cuts All Events NoiseSignal Layer 3 Layer 4 Layer 2 Layer 1

Khaled Belkadhi (LLR-Ecole Polytechnique)8 Cut at -50 ms Time Cuts Layer 3 Layer 4 Layer 2 Layer 1

Khaled Belkadhi (LLR-Ecole Polytechnique)9 9 Time Cuts cut at -400 mscut at -50 ms

  t < 300 ns.  t > -50 ms. 10Khaled Belkadhi (LLR-Ecole Polytechnique) Time Cuts

 Select Hits with time cuts to separate events in the train 11Khaled Belkadhi (LLR-Ecole Polytechnique) Tracks Reconstruction without position cuts

Problem: 1- Inclined Tracks 12Khaled Belkadhi (LLR-Ecole Polytechnique) Tracks Reconstruction without position cuts

2- Interaction 13Khaled Belkadhi (LLR-Ecole Polytechnique) Tracks Reconstruction without position cuts

Solution: 1.Take a first Hit in the first layer. 2.Select hits with time cuts. 3.Select hits with position cuts : ± 1 cm (1 pad) in X and Y.  Remove Inclined Tracks and Interaction Events 14Khaled Belkadhi (LLR-Ecole Polytechnique) Tracks Reconstruction with position cuts

Result: 15Khaled Belkadhi (LLR-Ecole Polytechnique) Tracks Reconstruction with position cuts

16Khaled Belkadhi (LLR-Ecole Polytechnique) Quality Plots Number of Hits:

17Khaled Belkadhi (LLR-Ecole Polytechnique) Quality Plots Number of Track Layers:

18Khaled Belkadhi (LLR-Ecole Polytechnique) Quality Plots Hits Time

RUN084 Beam Profile: 19Khaled Belkadhi (LLR-Ecole Polytechnique) Efficiency Map

RUN084 Efficiency Map: 20Khaled Belkadhi (LLR-Ecole Polytechnique) Efficiency Map % 0 % 100 % 0 % 100 % 0 % 100 % 0 %

21Khaled Belkadhi (LLR-Ecole Polytechnique) Efficiency Map

Khaled Belkadhi (LLR-Ecole Polytechnique)22 Conclusion  All tools for time reconstruct ion of events  Access to full detector history  Study of different parameters (Gaz, HV, Type of particles..): Full efficiency study