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Fast magnet method and apparatus used in conjunction with a charged particle cancer therapy system

  • US 9,314,649 B2
  • Filed: 03/31/2014
  • Issued: 04/19/2016
  • Est. Priority Date: 05/22/2008
  • Status: Active Grant
First Claim
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1. A method for rapidly redirecting positively charged particles in a charged particle cancer therapy system used to treat a tumor of a patient, comprising the steps of:

  • accelerating the positively charged particles with a synchrotron;

    extracting the positively charged particles through a first Lambertson extraction magnet to a fast switch magnet, said fast switch magnet comprising;

    an inductor;

    a first resistor, said first resistor comprising a resistance of at least one-tenth of an Ohm; and

    a switch, said first resistor and said switch wired electrically in parallel, said inductor and said first resistor wired in series;

    passing said positively charged particles through said fast switch magnet to a tumor treatment beamline at a first time, said fast switch magnet using a first current at the first time to yield a first charged particle directing magnetic field; and

    redirecting the positively charged particles, at a second time, to a beam stop using said fast switch magnet, said step of redirecting comprising the step of;

    opening said switch, said step of opening forcing the first current to pass through said first resistor resulting in a lower second current passing through said inductor, said second current at a second time resulting in a second charged particle directing magnetic field, said second charged particle magnetic field redirecting the positively charged particles to a beam stop, said first time and said second time differing by less than fifty microseconds.

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