Standing wave particle beam accelerator

Abstract

An accelerator for accelerating a particle beam includes a main body having a plurality of electromagnetic cavities coupled in series, and a first coupling body having a first side cavity coupled to one of the electromagnetic cavities through a first opening, and to another of the electromagnetic cavities through a second opening, wherein the first opening and the second opening have different configurations. The accelerator further includes a pair of conductive capacitively coupled noses secured to side walls of the first coupling body, wherein the pair of noses have equal lengths.

Description

technical field [0001] This invention relates generally to standing wave particle beam accelerators and, more particularly, to an electron accelerator for generating x-rays and beams of different energies. Background technique [0002] Standing wave particle beam accelerators have found widespread use in medical accelerators, where high energy particle beams are used to generate X-rays. In this application, the beam energy and output dose-rate must be stable. It would also be desirable to conveniently and reliably switch the energy of particle beams during medical treatment to provide treatment beams of different energies to achieve dose depth penetration. [0003] Different techniques for controlling the beam energy have been employed. In US Patent No. 4,286,192 to Tanabe and Vaguine, energy is controlled by decelerating the beam by reversing the accelerating field within a portion of the accelerator. In US Patent No. 4,382,208 to Meddaugh et al., the electromagnetic fie...

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Problems solved by technology

Thus, if the hospital changes its energy beam requirements, it will have to form a different accelerator

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