Charged particle cancer therapy beam path control method and apparatus
View Patent ↗The invention comprises a charged particle beam path coupling an injector, synchrotron accelerator, beam transport system, targeting system, and/or patient interface method and apparatus. Preferably, the injector comprises: a negative ion beam source, a two phase ion source vacuum system, an ion beam focusing lens, and/or a tandem accelerator. Preferably, the synchrotron comprises turning magnets, edge focusing magnets, magnetic field concentration magnets, winding and correction coils, flat magnetic field incident surfaces, and/or extraction elements. Preferably, the synchrotron, beam transport system, targeting system, and patient interface combine to allow multi-axis/multi-field irradiation, where multi-axis control comprises control of horizontal and vertical beam position, beam energy, and/or beam intensity and multi-field control comprises control of patient rotation and distribution of delivered energy in and about the tumor in a time controlled, targeted, accurate, precise, dosage controlled, and/or efficient manner.
1. A method for radiation therapy of a tumor of a patient with charged particles from a charged particle cancer therapy system, comprising sequential steps of:
generating hydrogen anions in an injector;
converting the hydrogen anions into protons using an injection foil;
injecting the protons into a synchrotron;
accelerated the protons in said synchrotron yielding accelerated charged particles;
inducing oscillation of the acceleration charged particles yielding oscillating charged particles;
extracting the oscillating charged particles from said synchrotron using an extraction foil yielding reduced energy charged particles; and
transporting the reduced energy charged particles to the tumor, wherein a charged particle beam path initiates in said injector, wherein said charged particle beam path circumferentially surrounds the protons in said synchrotron,
wherein said charged particles beam path circumferentially surrounds at least a portion of all of: (1) the hydrogen anions; (2) the accelerated charged particles; (3) the oscillating charged particles; and (4) the reduced energy charged particles, and
wherein the reduced energy charged particles traverse a reduced energy path inside of a mean radius of curvature path of the accelerated charged particles, said reduced energy path passing through an angle of at least ninety degrees circumferentially about a center of said synchrotron.
2. The method of claim 1 , further comprising the step of:
passing the charged particles through an input foil in said injector;
maintaining a first vacuum in said charged particle beam path on a first side of said injection foil; and
maintaining a second vacuum within said charged particle beam path on a second side of said input foil, wherein a first pressure of said first vacuum does not equal a second pressure of said second vacuum.
3. The method of claim 1 , further comprising the steps of:
producing negative ions in a negative ion beam with a negative ion source in said injector;
focusing the negative ions using first electric field lines in an ion beam focusing lens; and
converting the negative ions into the charged particles with a converting foil.
4. The method of claim 1 , further comprising the steps of:
generating an ion beam in an ion beam generation source of said injector;
creating a magnetic field barrier between a high temperature plasma zone within said ion beam generation source and a low temperature plasma region using a magnetic material centrally positioned within said ion beam generation source, wherein said charged particle beam path initiates with negative ions formed in said low temperature plasma region; and
extracting the negative ions from said low temperature plasma region forming a negative ion beam comprising the hydrogen anions,
wherein said charged particle beam path circumferentially surrounds said negative ion beam.