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Study on Cooling in LH2 for G4MICE Project at Oxford

Timothy Carlisle's study on cooling in liquid hydrogen for the G4MICE project at Oxford discusses the impact of step length on the simulation results and the need to carefully select the correct step length in Geant4. The study highlights the importance of adjusting parameters for accurate data. Suggestions include re-running simulations in the latest Geant4 version and contacting developers for assistance.

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Study on Cooling in LH2 for G4MICE Project at Oxford

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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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