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Charged particle beam acceleration and extraction method and apparatus used in conjunction with a charged particle cancer therapy system

  • US 8,067,748 B2
  • Filed: 07/06/2009
  • Issued: 11/29/2011
  • Est. Priority Date: 05/22/2008
  • Status: Active Grant
First Claim
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1. An apparatus for tumor therapy using charged particles, the charged particles accelerated by a rounded corner polygon synchrotron, said synchrotron comprising:

  • a center;

    a charged particle circulation beam path running;

    about said center;

    through straight sections; and

    through turning sections,wherein each of said turning sections comprises a plurality of bending magnets,wherein at least two of said plurality of bending magnets further comprise a magnetic field focusing section, said focusing section comprising;

    a magnet core geometry tapering from a first cross-sectional area extending from opposite sides of a first winding about said core to a second cross-sectional area, said second cross-sectional area comprising less than two-thirds of an area of said first cross-sectional area, said second cross-sectional area proximate and about parallel to said charged particle beam path; and

    a computer implemented extraction control algorithm, said extraction control algorithm configured to receive input generated by a current originating at an extraction foil, said extraction foil proximate said charged particle circulation beam path, said extraction control algorithm configured to compare a feedback input to an irradiation plan, said extraction control algorithm configured to adjust a radio-frequency field in a radio-frequency cavity system.

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