New nonscaling FFAG for medical applications

C. Johnstone, S. Koscielniak
2007 2007 IEEE Particle Accelerator Conference (PAC)  
A hybrid design for a Fixed-Field Alternating-Gradient (FFAG) accelerator has been invented which uses edge and alternating-gradient focusing principles applied in a specific configuration to a combined-function (CF) magnet to stabilize tunes through an acceleration cycle which extends over a factor of 6 in momentum. Using normal conducting magnets, the final, extracted energy from this machine can attain slightly more than 400 MeV/nucleon without the use of superconducting elements. By using
more » ... xed-fields, the machine proposed here has the high current advantage of the cyclotron yet retains important features of the synchrotron: smaller radial aperture, variable energy, and both kicker-based and resonant extraction. This machine, without modification, supports a proton and a carbon ion beam in the energy range of interest for cancer therapy. Competing machines for this application include superconducting cyclotrons[1], synchrotrons [2] , and, more recently, scaling FFAGs. As such this machine represents a broad innovation in therapy machines.
doi:10.1109/pac.2007.4440631 fatcat:33fgbs74bvhpjnteqfa2vs3xxu