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First Testbeam Results: Overview, Pedestal & Noise, Signals, Tracks, Position Resolution, Summary, Future Plans

This report provides an overview of the first testbeam results for the ISIS sensor, including analysis of pedestals and noise, signal characteristics, track correlations, position resolution, and a summary of the findings. It also outlines future plans for publication and further testing with the EUDET telescope.

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First Testbeam Results: Overview, Pedestal & Noise, Signals, Tracks, Position Resolution, Summary, Future Plans

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  1. First Testbeam results • Overview • Pedestal & Noise • Signals • Tracks • Position resolution • Summary • Future plans Jaap Velthuis, University of Bristol

  2. Overview • Beam test October-November 2007 • DESY 1…6 GeV e- • Self contained ISIS telescope • 5 ISIS in a row Jaap Velthuis, University of Bristol

  3. ISIS sensor • Build a complete testbeam/lab DAQ system within 3 months! • Prototype LCFI ‘Proof of Principle’ ISIS1 Sensor (produced by e2v). • 16×16 pixels each 40×160μm2 • Total active area 0.5×2.24mm2 • Needed precision mounting Jaap Velthuis, University of Bristol

  4. Pedestal Noise Pedestals and Noise • Calculate average offset for each pixel • Reiterate to remove hits • Random noise calculated as std dev after pedestal removal • No common mode found Jaap Velthuis, University of Bristol

  5. η=Qright/(Qleft+Qright) Signals • Cluster cut • 5σ seed cut • 2σ next cut • Clusters small • Pitch 160 μm in X • Almost no charge sharing in X • η in Y demonstrates charge sharing • S/N=33.6±0.4 Jaap Velthuis, University of Bristol

  6. x(sensor) vs. x(sensor) y(sensor) vs. y(sensor) Tracks • Tracks result in correlations between hits in different ISIS sensors Jaap Velthuis, University of Bristol

  7. Position resolution • Using ISIS 0,1 and 3 to predict ISIS 2 • Alignment can still be improved • σ = 11.6± 0.4 μm • Doesn’t work X: • Pixels too large • Beam parallel Jaap Velthuis, University of Bristol

  8. Summary • Performed successful beam test • Demonstrated that ISIS works well as a sensor • Results: • S/N=33.6±0.4 • σ = 11.6± 0.4 μm • Very good! Note that: • Thinning to ILC thickness does not affect S/N • Pixels still very large Jaap Velthuis, University of Bristol

  9. Future plans • Publish results • Beam test in August 2008 at CERN using EUDET telescope • Need this to study in-pixel variations • Possible due to high momentum particles and precision EUDET telescope • Optimise operation parameters • Need to test and compare p-type ISIS Jaap Velthuis, University of Bristol

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