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Muon Calibration Difficulties

Muon Calibration Difficulties. Calibration Shortcomings Angular Effects Old Path Length Correction New Correction Results Other Matters. Ryan Nichol and Chris Smith (and Jim Musser). Problems With Old Method. Beam Muons Show Even/Odd Asymmetry.

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Muon Calibration Difficulties

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  1. Muon Calibration Difficulties Calibration Shortcomings Angular Effects Old Path Length Correction New Correction Results Other Matters Ryan Nichol and Chris Smith (and Jim Musser)

  2. Problems With Old Method • Beam Muons Show Even/Odd Asymmetry. • Old Calibration Required Double Ended Hits. • To Remove Crosstalk. Ryan Nichol, Chris Smith

  3. Corner Clippers • New ‘Tracker’ Enabled Lifting Of Double Ended Hit Requirement. • This Led To Inclusion Of More Corner Clipping Muons. • Decided To Remove Corner Clipping Hits From Sample. Ryan Nichol, Chris Smith

  4. Angular Distribution • Large Angular Asymmetry at CalDet. • Due To Orientation of Planes. Ryan Nichol, Chris Smith

  5. Angular Dependence of Pulse Height • Corner Clippers Removed. • Two Views Have Similar Dependence. • Strange Bimodal Shape. Ryan Nichol, Chris Smith

  6. Path Length Factors • Angular Dependence. • Finite Strip Width. • Affects Two Orientations Differently. • Minimum Path Length In Strip. • Path Length In Neighbouring Strips. • Transverse Position Across Strip Width. • Other Effects?? Ryan Nichol, Chris Smith

  7. Geometrical Constraints • Path Length Constrained By: • Finite Strip Width • Minimum PL in Strip. • Maximum PL in neighbouring strips. • These extrema are determined by light output. Ryan Nichol, Chris Smith

  8. Transverse Position Across Strip • Pulse Height Depends on Transverse Position Across Strip. Ryan Nichol, Chris Smith

  9. Old Path Length Correction • Tries To Account For: • Angle • Finite Strip Width • Minimum Path Length • Doesn’t Succeed. • Introduces Even/Odd Bias. Ryan Nichol, Chris Smith

  10. New Path Length Correction • The ‘Solution’: • 92% • Only Accounts For Angles. • Corrects to 2% level. Ryan Nichol, Chris Smith

  11. Results • New Calibration Removes Some Of The Even Odd Asymmetry • Still not an ideal calibration. Ryan Nichol, Chris Smith

  12. Forwards-Backwards Asymmetry • Seemingly More Energy Deposited By Cosmics Traveling Backwards Through The Detector. • Steel-Scintillator-Air or Steel-Air-Scintillator? • Groove Position? • Needs Further MC Investigation. Ryan Nichol, Chris Smith

  13. Upstream/Downstream-going trackResponse Difference – Far Detector (from J. Musser) Tracks going ‘towards Chicago’ produce systematically higher light output Upper curve: Cos(qz)<0 Abs(Cos(qz)) Ryan Nichol, Chris Smith

  14. Upstream/Downstream-going TrackResponse Difference – Far Detector Simulation • Similar effect seen in MC at ~5% level Ryan Nichol, Chris Smith

  15. Muon Response With Temperature • We Have Two Weeks Of Cosmic Muon Data For Temperature Studies. • In First 46 Hours See: • -0.38% Shift / oC Ryan Nichol, Chris Smith

  16. Summary • Large Angular Asymmetry Between Views. • Due To Orientation Of Planes. • Complicated Pulse Height Dependence. • Old (Current) Path Length Correction Wrong. • Best Results From A ‘Fudge Factor’. • See ‘Interesting’ Direction Asymmetry. • Developing A Temperature Calibration. Ryan Nichol, Chris Smith

  17. Error On Determination Of Angle • Bands Correspond To Muon Track Length. • Accuracy Limited By Strip Resolution. Ryan Nichol, Chris Smith

  18. New Tracker Working Well Ryan Nichol, Chris Smith

  19. Simulation Results • Simulated Muons In CalDet With Measured Angular Distribution. • Calculated Path Length Differs From True Path Length. Ryan Nichol, Chris Smith

  20. More Front-Back Fun Ryan Nichol, Chris Smith

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