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G4MICE Cooling Study

G4MICE Cooling Study. Timothy Carlisle Oxford. Cooling in LH2 – G4MICE. 35 cm. Errors expected to be ‘small’ due to high stats (100k muons )...but still need adding. p z = 207 MeV /c N m = 100,000 Step IV fields. Summary. Eq. Emittance  0 strongly dep . o n Step Length.

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G4MICE Cooling Study

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  1. G4MICE Cooling Study Timothy Carlisle Oxford

  2. Cooling in LH2 – G4MICE 35 cm Errors expected to be ‘small’ due to high stats (100k muons)...but still need adding pz = 207 MeV/c Nm = 100,000 Step IV fields

  3. Summary • Eq. Emittance0strongly dep. on Step Length. • Consistent value in different absorber widths • Cooling formula isn’t much help deciding the correct Step Length! • G4MICE (Geant4) uses Lewis Theory for Multiple Scattering • From the Geant4 manual: “the simulation results can depend on the value of the step length and generally one has to select the value of the step length carefully.” • How does one select the correct Step Length? • Is this dependency a bug? Or simply a fact of life in Geant4? • G4MICE uses Geant4.9.2...latest version is 4.9.5 • Suggestions: • Re-run in latest version of Geant4? (Is it a bug?) • Contact Geant4 developers?

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