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US 6,642,678 B1Granted
Linear accelerator
AssigneeElekta Limited
InventorsJohn Allen, Leonard Knowles Brundle, Terry Arthur Large, Terence Bates
Life of this patent
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AssigneeElekta Limited
InventorsJohn Allen, Leonard Knowles Brundle, Terry Arthur Large, Terence Bates
Estimating the term…
A standing wave linear accelerator has a plurality of resonant cavities located along a particle beam axis. One or more pairs of resonant cavities are electromagnetically coupled via a coupling cavity. A rotationally asymmetric element within the coupling cavity is adapted to rotate about an axis that is substantially parallel to the axis of the coupling cavity. The coupling cavity is imperfectly symmetric about its axis due to a relative excess of material disposed within the cavity in the portion opposed to the apertures. Rotation of the polarization of a TE111 mode inside the cylindrical cavity provided a simple single mechanical control of coupling value, that has negligible effect on the phase shift across the device. A slight frequency dependence on the angle of rotation is correctable by a relative excess of material located opposite the apertures between the coupling cavity and the accelerating cavities.
A standing wave linear accelerator, comprising a plurality of resonant cavities located along a particle beam axis, at least one pair of resonant cavities being electromagnetically coupled via a coupling cavity communicating with the resonant cavities via apertures, there being a rotationally asymmetric element within the coupling cavity adapted to rotate about a axis substantially parallel to the axis of the coupling cavity, the coupling cavity being imperfectly rotationally symmetric about its axis, the imperfection being at least due to a relative excess of material disposed within the cavity in the portion thereof opposed to the apertures.
A standing wave linear accelerator comprising:
A standing wave linear accelerator having a plurality of resonant cavities located along a particle beam axis, comprising:
Dependencies are inferred from the claim text.