E166 Photon Asymmetry Simulation

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Presentation transcript:

E166 Photon Asymmetry Simulation 1 - 7 E166 Photon Asymmetry Simulation How it works Results Comparing to Measurements V.Gharibyan 1 Nov 2006 DESY

Photon Asymmetry Simulation How it works 2 - 7 E166 Photon Case Targets Analytic Integration Monte-Carlo Tracking Exponential Decay ds dW ds dW Stot , Stot , Stot V.Gharibyan 1 Nov 2006 DESY

Photon Asymmetry Simulation How it works 3 - 7 Explore MeV photon interaction main processes: Iron electrons are Polarized, so the Compton scattering. At the moment neglect polarization in Photo-effect. V.Gharibyan 1 Nov 2006 DESY

Photon Asymmetry Simulation Results 4 - 7 Undulator spectra provided by Klaus Flotmann. k=0.19 l = 2.54cm V.Gharibyan 1 Nov 2006 DESY

Photon Asymmetry Simulation Comparing to Measurements 5 - 7 Cherenkov Multiphoton Counting Detector Prediction is 3.64% Measurement 3.50% If effective threshold is 5MeV ? V.Gharibyan 1 Nov 2006 DESY

Photon Asymmetry Simulation Comparing to Measurements 6 - 7 Multiphoton Energy Integrating Detector (Calorimeter) Prediction is 3.26%. Observed 3.52%. V.Gharibyan 1 Nov 2006 DESY

Photon Asymmetry Simulation Conclusion 7 - 7 Measured and predicted numbers are pretty much close. None of them has an error to quote. One detector (calorimeter) measures higher and the other (Cherenkov) lower than predicted asymmetry. This points the observed discrepancy to originate from detector/simulation rather than from original undulator spectra. A polarized photo-effect could be considered. V.Gharibyan 1 Nov 2006 DESY