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BeamCal Simulation Studies at SCIPP

This study aims to confirm and refine estimates of single-electron efficiency as a function of radius and energy using BeamCal simulations. The group will implement a radial segmentation scheme, explore the effect of anti-DID field on backgrounds and efficiency, determine the optimal segmentation size, and implement a realistic IP/BeamCal geometry.

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BeamCal Simulation Studies at SCIPP

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  1. BeamCal Simulation Studies at SCIPP FCAL Segmentation Working Group Meeting 14 July 2014 Bruce Schumm UCSC/SCIPP

  2. The SCIPP/UCSC BeamCal Simulation Group Includes PI (me) plus three undergraduates; one (Milke) supported by US/DOE R&D funds Bryce Burgess Olivia Johnson Christopher Milke Also enjoy critical support from Norman Graf at SLAC

  3. Immediate Goals of Group • Confirm/refine estimates of single-electron efficiency as a function of radius and energy • Implement radial segmentation scheme (done) • Explore effect of anti-DID field on backgrounds and efficiency • Determine optimal segmentation size • Implement realistic IP/BeamCal geometry • Physics analysis?

  4. BeamCal Simulations Goal: • Reproduce Colorado studies of BeamCal electron ID efficiency/purity • Determine sensitivity to increased/decreased background accumulation rates (different beam-delivery configurations)

  5. Reconstruction Algorithm • Choose seed layer • Subtract mean background from all pixels • Sum energy in sliding window (“tile”) of NxN beamcal pixels (N is optimized) • Chose highest 50 tile depositions in layer [determine efficiency that electron is one of them] • Reject spurious tiles via longitudinal patterns

  6. Signal to Noise Comparison layer 8 Colorado: Mean background is x100 mean signal SCIPP: Mean background is x500 mean signal Have been unable to understand what changed

  7. Background Distribution in Radial Bins Discard 10% of luminosity

  8. Background Distribution in Phi Bins Discard 10% of luminosity

  9. Signal Distributiuon (?) for 50 GeV Electrons

  10. z BLACK Interaction point of 150 GeV signal electrons BLUE RED is every-thing else r- Not sure what this is supposed to be?

  11. BeamCal Simulations: Next Steps • Any thoughts on nature/origin of discrepancy between Colorado/SCIPP signal/background files? • Calibration • Configuration • Beam conditions… • For now, trying to develop Colorado-like analysis with degraded S/N • Outcome not clear  Plea for support

  12. Backup

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