ILC-Oriented R&D I: Electromagnetic Radiation Damage Studies BeamCal instrument expected to receive up to 100 Mrad per year of electromagnetically-induced.

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Presentation transcript:

ILC-Oriented R&D I: Electromagnetic Radiation Damage Studies BeamCal instrument expected to receive up to 100 Mrad per year of electromagnetically-induced radiation SLAC Experiment T506 uses End Station Test Beam directed on 7 X 0 of Tungsten radiator to generate EM showers Doses of up to 220 Mrad absorbed by various types of Si diode sensors as well as GaAs bulk sensors

Electromagnetic Radiation Damage Studies: Selected Results N-type magnetic Czochralski bulk Si diode detector irradiated to 220 Mrad Increase in depletion voltage and decrease in charge-collection observed, but preformance still adequate for calorimetry N-type float-zone bulk Si diode detector irradiated to 90 Mrad Increase in depletion voltage but no decrease in charge-collection observed; some improvement in depletion voltage obtained with controlled annealing

ILC-Oriented R&D II: BeamCal Design and Performance Simulations Have developed local computer system to analyze simulated BeamCal background and signal (physics major Christopher Milke) Have implemented flexible tiling scheme for BeamCal sensors Will explore performance vs. tiling scheme and granularity; also will compare “competing” reconstruction algorithms

ILC-Oriented R&D II: BeamCal Design and Performance Simulations BeamCal signal reconstruction efficiency (SCIPP algorithm) as a function of radius from nominal beam trajectory “Sigma Cut” of 4.0 required to ensure that less than 10% of background-only events give false positives Looking also at energy, position resolution of reconstruction algorithms; comparative performance studies expected by October LCWS meeting (Belgrade)