Acc

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• RACCAM Project.
• 1) Goals.
• 2) Team.
• 3) Spiral FFAG study for protontherapy.
• Matrix and ray-tracing code investigations.
• 1) Spiral FFAG design.
• 2) Matrix formalism for spiral FFAG.
• 3) Matrix / ray-tracing comparison.
• Automated simulations.
• IV. Conclusion.

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RACCAM Project.
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• 1) Goals.
• Constitute in France a team of accelerator
  physicists / engineers active in FFAGs, beam
  dynamics and 3D magnet calculation.
• Contribute to theoretical studies and to on-going
  international scaling and non-scaling FFAG RD
  activities.
• Study the use of proton FFAGs in the medical
  domain radiological treatment of tumors,
  radiobiology research.
• Construction and tests of a FFAG magnet prototype.

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• LPSC.
• François Méot project director.
• Emmanuel Froidefond
• Jaroslaw Pasternak
• Johann Collot laboratory director.
• Bruno Autin
• Franck Lemuet
• Joris Fourrier
• 6 meetings since december 2005.
• LPSC
• Grenoble Hospital
• Centre Protonthérapie Orsay
• Centre Antoine Lacassagne

• 2) Team.
• Physicians.
• Jacques Balosso
• Pascal Pommier
• Sigmaphi.
• Jean-Luc Lancelot
• Damien Neuvéglise
• Thomas Planche

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• 3) Spiral FFAG study for protontherapy and
  radiobiology.
• Focus on scaling type spiral FFAG.
• Considered advantages constant tunes during
  acceleration, more compact and cheaper machines
  than synchrotrons.
• J. Balosso about possible proton FFAG innovation
  If such an innovation was made available, the
  large majority of radiotherapy, certainly more
  than the two third, could be done by proton
  beams.
• Preliminary studies on 3 100 MeV proton spiral
  FFAG undertaken for numerical tools development.

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Matrix and ray-tracing code investigations.
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1) Spiral FFAG design for ray-tracing code Zgoubi.

• Zgoubi ray-tracing code
• Based on Lorentz equation numerical integration.
• Tracking through magnet designs or magnetic field
  maps.
• Beam dynamic calculation (closed orbit, tunes,
  acceptance).

di distances to entrance / exit magnet faces. g
magnetic gap.
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• 2) Matrix formalism for spiral FFAG lattice.
• Mathematica / BeamOptics matrix code used to
  determine zero / first order parameters closed
  orbits, tunes, beta and dispersion function.
• Spiral FFAG lattice model MFFAGMdrift.Medge.Mben
  d.Medge.Mdrift
• Fringing field correction in edge matrices

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• 3) Matrix / ray-tracing comparison.
• Mathematica / BeamOptics matrix code
• () easy to use, fast 1st order parameter
  calculations.
• () based on models, discrepancies can occur
  with real machines.
• Zgoubi ray-tracing code
• () accurate results for 1st order parameters,
  beam transmission, acceptance studies.
• () long simulations compared to matrix code.
• Goal use of both codes in a complementary way.
• Investigations to have a good agreement between
  codes.

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Automated Simulations.
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• Zgoubi simulations long and tedious if done one
  by one need of automation.
• Closed orbit
• Stability limits

Particle with stable motion
Closed orbit
Particle slightly deviated
Closed orbit
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Conclusion.
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• Efficient matrix and ray-tracing methods
  developed for spiral FFAGs.
• Good agreements between both codes but some model
  improvement necessary.
• Preliminary design study on the way with
  complementary use of codes.
• Automated Zgoubi simulations for beam dynamic and
  transmission studies.

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Thank you for your attention.