Standing wave particle beam accelerator
AssigneeVarian Medical Systems Technologies, Inc.
InventorsGard E. Meddaugh, Mark E. Trail, David Whittum
Life of this patent
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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.
Claims33
An accelerator for accelerating a particle beam, comprising:
- a main body having a plurality of electromagnetic cavities coupled in series;
- a first coupling body having a first side cavity coupled to two of the electromagnetic cavities, wherein the first side cavity is coupled to one of the two of the electromagnetic cavities through a first opening, and to another of the two of the electromagnetic cavities through a second opening, and wherein the first opening and the second opening have different sizes;
- and
- a second coupling body coupled to the main body, the second coupling body having a second side cavity in communication with a third opening and a fourth opening, wherein the third and the fourth openings have a same size.
An accelerator for accelerating a particle beam, comprising:
- 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 sizes;
- a second coupling body having a second side cavity coupled to the main body;
- and
- an energy switch for changing an electric field distribution in the second side cavity.
An accelerator for accelerating a particle beam, comprising:
- a main body having a plurality of electromagnetic cavities coupled in series along an axis;
- a coupling body having a side cavity coupled to two of the electromagnetic cavities;
- and
- an energy switch having only one probe for changing an electric field distribution in the side cavity;
- wherein the probe has an axis that is parallel and offset from an axis of the coupling body, and varying a degree of insertion of the probe into the side cavity changes an electromagnetic field coupling between the two of the electromagnetic cavities.
An accelerator for accelerating a particle beam, comprising:
- a main body having a plurality of electromagnetic cavities coupled in series along an axis;
- and
- a device for generating a desired electric field profile along the axis to control separation of resonant modes of the electromagnetic cavities;
- wherein the device comprises:
- a coupling body having a cavity that couples to one of the electromagnetic cavities through a first opening, and to another of the electromagnetic cavities through a second opening, wherein the first and the second openings have different sizes;
- and
- a pair of conductive capacitively coupled noses secured to side walls of the coupling body, the pair of noses having equal lengths in a direction of the axis.
An accelerator for accelerating a particle beam, comprising:
- a main body having a plurality of electromagnetic cavities coupled in series along an axis;
- and
- a device for generating a desired electric field profile along the axis to control separation of resonant modes of the electromagnetic cavities;
- wherein the device comprises a dividing wall that separates two of the electromagnetic cavities, and a beam aperture for allowing the particle beam to travel therethrough, the beam aperture having a cross sectional dimension that is different from that of an adjacent beam aperture.
An accelerator for accelerating a particle beam, comprising:
- a main body having a plurality of electromagnetic cavities coupled in series;
- a first coupling body having a first side cavity coupled to two of the electromagnetic cavities, wherein the first side cavity is coupled to one of the two of the electromagnetic cavities through a first opening, and to another of the two of the electromagnetic cavities through a second opening, wherein the first opening and the second opening have different shapes;
- and
- a second coupling body coupled to the main body, the second coupling body having a second side cavity in communication with a third opening and a fourth opening, wherein the third and the fourth openings have a same shape.
An accelerator for accelerating a particle beam, comprising:
- 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 shapes;
- a second coupling body having a second side cavity coupled to the main body;
- and
- an energy switch for changing an electric field distribution in the second side cavity.
Dependencies are inferred from the claim text.