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MICE - Simulation/Optics Summary

MICE - Simulation/Optics Summary. Chris Rogers, UKNFIC 17th Feb 05. Simulation. Developing simulation Version 1.0 released!! Big step for the Simulation Means we have full geometry etc in G4MICE Some talks on Physics processes/modelling in G4MICE Two MICE-Notes posted.

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MICE - Simulation/Optics Summary

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  1. MICE - Simulation/Optics Summary Chris Rogers, UKNFIC 17th Feb 05

  2. Simulation • Developing simulation • Version 1.0 released!! • Big step for the Simulation • Means we have full geometry etc in G4MICE • Some talks on Physics processes/modelling in G4MICE • Two MICE-Notes posted

  3. Overview - Yagmur Torun

  4. Physics Processes - Rikard Sandstrom- Summary • We can simulate anything we want at MeV scale. • Geant4 has matured into a reliable tool. • We will move to G4.7 soon. • Many changes to stepping and physics requires testing of G4MICE physics. • With the correct background the user of G4MICE can/will be able to set up environment to fulfill her exact requirements. • G4MICE has physics defaults which makes sense. • Will need optimization. • Depending on what you do with G4MICE the idea of ideal defaults differ. (E.g. should muon decay be on by default?)

  5. Cooling & Tracking - Chris Rogers • Comparison of Simulation performance in G4MICE and ICOOL • ICOOL is a well regarded piece of code developed by the (US?) Neutrino Factory and Muon Collider Collaboration

  6. Summary - Default values • B-Field • Br ~ 1%; Bz ~ 0.4% • Grid Spacing • X ~ 1%; Px ~ 0.01% • Step Size • X ~ 2%; Px ~ 1% • Single Particle through absorber • ds(E) ~ 1%, ds(t) ~ 25%; ds(px) ~ 10% • (But time spread is negligible factor anyway) • Bunch through absorber • d De ~ 0.5% transverse, 0.3% longitudinal

  7. Optics & Beamline • Optics - optical solution has been found for all MICE stages I - VI (i.e. currents set) • Optics WIP MICE stage “V.0”, “III+”, MRI solenoid • Some discussion of using cheaper “MRI” solenoids for the tracker • Medical solenoids 3T field instead of 4T • Beamline well developed • Needs to be matched to MICE • Target still needs work • Some diagnostics proposed in the Isis beamline

  8. Optics Solutions - Ulisse Bravar • Need to make sure that the magnetic fields are suitably arranged to stop beam scraping, enhance cooling performance • Solve 2nd order DE • 128 solutions for different initial momenta, MICE stages • WIP - solutions for MICE stage “V.0”, “III+”, MRI solenoid • Ulisse has changed work emphasis - future unclear • Some personnel changes

  9. - STEP I: spring 2006 STEP II: summer 2006 STEP III: winter 2007 STEP IV: spring 2007 STEP V: fall 2007 STEP VI: 2008 MICE Stages 2006 …………… 2007 …………… 2008

  10. Solenoid Design and Cost update • Decision on 3T “MRI” vs 4T solenoid • Impact on tracker resolution • Not clear whether MRI magnets are cheaper • Still an open question • Also talk of two different 4T solenoids • INFN and LBNL • Can only build one LBNL solenoid but cheaper

  11. Beamline • Main issue is matching the Beamline into MICE • Beamline has low emittance ~ 1 mm pi rad • MICE requires emittance 1 - 15 mm pi rad • Put lead sheets between Beamline and MICE • Details need to be resolved

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