Synchrotron energy control apparatus and method of use thereof
First Claim
1. A method for controlling charged particle energy, comprising the steps of:
- providing circulating charged particles traversing a circulation beam path of a synchrotron, said circulation beam path comprising a pathlength;
applying a radio-frequency across a first pair of blades to convert the circulating charged particles to oscillating circulating charged particles, said radio-frequency comprising a frequency time period, said frequency time period in phase with the oscillating charged particles passing between said first pair of blades in the circulation beam path;
determining a pre-extraction energy of the oscillating circulating charged particles, related to a velocity of the oscillating circulating charged particles, using said pathlength and said frequency time period;
said step of applying the radio-frequency transmitting the oscillating circulating charged particles through an extraction material with a resultant energy loss to form a reduced energy charged particle beam;
applying at least five hundred volts across a second pair of blades, wherein said second pair of blades redirects the reduced energy charged particle beam to a deflector and out of said synchrotron yielding an extracted charged particle beam; and
calculating energy of the extracted charged particle beam via reduction of the pre-extraction energy of the oscillating charged particles by the energy loss.
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Abstract
The invention relates to a method and apparatus of control and/or determination of energy and/or velocity of a beam of a charged particles extracted from a synchrotron, the synchrotron using a radio frequency field to redirect the charged particles through an extraction material. The method and apparatus for extracting a group of charged particles at a known and controlled energy is optionally used in conjunction with any apparatus and/or technique coupled to a synchrotron, such as a charged particle cancer therapy system. For example, the knowledge/control of the charged particle beam delivery energy is used in conjunction with a multi-axes and/or a multi-field tumor irradiation system in combination with a tumor treatment plan to accurately ablate or irradiate a tumor.
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Citations
13 Claims
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1. A method for controlling charged particle energy, comprising the steps of:
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providing circulating charged particles traversing a circulation beam path of a synchrotron, said circulation beam path comprising a pathlength; applying a radio-frequency across a first pair of blades to convert the circulating charged particles to oscillating circulating charged particles, said radio-frequency comprising a frequency time period, said frequency time period in phase with the oscillating charged particles passing between said first pair of blades in the circulation beam path; determining a pre-extraction energy of the oscillating circulating charged particles, related to a velocity of the oscillating circulating charged particles, using said pathlength and said frequency time period; said step of applying the radio-frequency transmitting the oscillating circulating charged particles through an extraction material with a resultant energy loss to form a reduced energy charged particle beam; applying at least five hundred volts across a second pair of blades, wherein said second pair of blades redirects the reduced energy charged particle beam to a deflector and out of said synchrotron yielding an extracted charged particle beam; and calculating energy of the extracted charged particle beam via reduction of the pre-extraction energy of the oscillating charged particles by the energy loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling an energy of an extracted charged particle beam, comprising the steps of:
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using a synchrotron to circulate charged particles along a circulation beam path, said circulation beam path comprising a pathlength; a controller receiving a cancer treatment plan comprising a requested beam energy; said controller controlling a peak-to-peak time period of a radio-frequency applied across the circulation beam path of said synchrotron, said peak-to-peak time period comprising a periodic time equal to an integer multiple of a time period of circulation of the charged particles along the circulation beam path; said controller redirecting the charged particles through an extraction material resultant in an energy loss and the charged particles traversing an extraction path; calculating an energy of the charged particles at a time of extraction using the pathlength and the peak-to-peak time period; and reducing the energy of the charged particles by the energy loss to yield the energy of the extracted charged particle beam.
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Specification