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Geant4 Simulations of the MICE Beamline

This document details the Geant4 simulations of the MICE beamline, conducted by Tom Roberts at the Illinois Institute of Technology. It outlines the layout and tuning parameters, specifically highlighting the configurations for Bend magnets, quad tuning, and target dimensions. The simulations focus on optimizing the muon to pion ratio at Diffuser1, presenting various momentum settings and the crucial need for absolute normalization against the proton beam. Additional plots illustrate the correlations of muons and pions, underscoring potential areas for future tuning to improve beam quality.

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Geant4 Simulations of the MICE Beamline

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  1. Geant4 Simulations of the MICE Beamline Tom Roberts Illinois Institute of Technology 7/30/03

  2. MICE Beam Layout and Tune • Layout from “LAYOUT-MICE 14May03” • Bend 1 is 60°, Bend 2 is 32° • Target to Diffuser1 is 18.8 m • Quad (Type IV) and Bending Magnet (Type I) parameters are from RAL drawings and tables. • Fringe fields for Bending Magnets were computed via Laplace’s equation; quads are ideal (no fringe fields). • Bend 1 is tuned for 300 MeV/c pions • Bend 2 is tuned for 200 MeV/c muons • Quads are tuned for maximum mu/pi ratio at Diffuser1 (using minuit) – the triplet is configured DFD (~20% better than FDF) • Quad tuning gives ~60 times better mu/pi than reported in New York

  3. Input Beam • Pi+ beam • 200 MeV/c < P < 400 MeV/c (uniform) • dxdz and dydz generated to cover Q1 aperture (uniform) • Target is 10 mm high, 10*cos(25°) mm wide (uniform) • All materials kill tracks instantly, without secondaries Absolute normalization to the proton beam is needed, as is the proton background, and the other backgrounds.

  4. Momentum at Diffuser1

  5. P at Q1 for mu+ at Diffuser1

  6. Mu+ Correlation Matrix (normalized) P < 250 MeV/c

  7. Summary • The major correlations in the beam should be removable by the diffusers • More tunes should be explored (e.g. Bend1 tuned to 350 MeV/c and 400 MeV/c) • We need absolute normalization to the proton beam • We need to understand the beam backgrounds

  8. Additional Slides The following plots are all at Diffuser1.

  9. Mu+ X vs Y

  10. Pi+ X vs Y

  11. Mu+ X vs P

  12. Pi+ X vs P

  13. Mu+ X’ vs P Note where X’=0 is.

  14. Pi+ X’ vs P Note where X’=0 is.

  15. Mu+ X vs X’ Note where X’=0 is.

  16. Pi+ X vs X’ Note where X’=0 is.

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