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Nonscaling FFAGs for Hadron Therapy

Nonscaling FFAGs for Hadron Therapy. C. Johnstone, Fermilab FFAG08 Sept 1-5, 2008 University of Manchester Manchester, U.K. Fermilab. Advances in Medical FFAG accelerators. Scaling FFAGs – primarily under development in Japan and recently France Nonscaling FFAGs Linear-field FFAGs

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Nonscaling FFAGs for Hadron Therapy

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  1. Nonscaling FFAGs for Hadron Therapy C. Johnstone, Fermilab FFAG08 Sept 1-5, 2008 University of Manchester Manchester, U.K. Fermilab

  2. Advances in Medical FFAG accelerators • Scaling FFAGs – primarily under development in Japan and recently France • Nonscaling FFAGs • Linear-field FFAGs • International effort (EMMA ) • Tune-stablized, linear-field FFAG • Developed at Fermilab with collaborative design support from TRIUMF and more recently John Adams Institute, Oxford. • PAC awarded a Phase I, F. Mills, MSU (Makino and Berz), TRIUMF (Koscielniak), U of Riverside, (Snopok), CRADA with Fermilab (Johnstone and Kashikhin) Fermilab

  3. Goals of FFAG designs for Medical Accelerators • Ultimate design consistent with carbon therapy • Preliminary lattices capable of 400 MeV for protons • 10-20 mm-mr normalized acceptance – not yet optimized • Small footprint: ~40m normal conducting, 20 m superconducting (protons) • Synchrotron-like features • Variable extraction energy • Resonant or kicker extraction • Low losses and component activation • Multiple extraction points – multiple treatment areas • Cyclotron-like features • High current output • Ease of operation – no pulsed components or supplies Fermilab

  4. Approach : Apply an edge contour to a linear field nonscaling FFAG • Linear edge • Variational edge Fermilab

  5. Effect of an edge contour on a nonscaling FFAG Linear-field gradients Linear-gradient + constant edge angle Linear grad+edge contour Fermilab

  6. Components and Cell Parameters Magnet widths Drift vs. Momentum Field vs Momentum Fermilab

  7. Ring parameters of tune-stabilized nonscaling FFAG lattice* Fermilab

  8. Conclusions • Factor of 5-7 in momentum with stable tune has been achieved with a linear gradient and an edge contour. • Magnet designs are presently underway • Implementation in ZGOUBI and COSY and full tracking and optimization next Fermilab

  9. Summary of Nonscaling FFAG status and progress • Simultaneous multiple sources and injection port • Multiple extraction ports • Slow or fast resonance or kicker based extraction • resonance extraction has been demonstrated in simulations • Variable energy to ~50% of extraction energy – no use of degraders • Preliminary magnet designs • CRADA established with Fermilab Fermilab

  10. FFAGs – General • Over 30 scaling and nonscaling FFAGs are under design or construction. Applications include • Accelerator Driven Subcritical Reactor • Boron Neutron Capture Therapy • Accelerator-based Neutron Source • Emittance/Energy Recovery with Internal Target (ERIT) • The first nonscaling FFAG prototype for rapid acceleration (EMMA) is being built at Daresbury Laboratory, U.K. • A medical nonscaling FFAG accelerator (PAMELA) is under study in the U.K. Fermilab

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