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US 2012/0235602 A1Published application
Linear accelerator
AssigneeElekta AB (publ)
InventorsJohn Allen, Terry Arthur Large
Life of this patent
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Abstract
The present invention provides a linear accelerator in which a rotatable conductive vane is employed to vary the electromagnetic coupling between adjacent accelerating cells. The vane is sealed off from the rest of the linear accelerator by an insulating partition, so the pressure around the vane can be higher than in the rest of the accelerator. This greatly simplifies the mechanisms which may be used to control the rotation of the vane, allowing a higher bakeout temperature in manufacture and a higher rate of rotation in use.
Claims14
A linear accelerator, comprising:
- a plurality of accelerating cavities arranged in a linear array, adjacent pairs of which are electromagnetically coupled via respective coupling cavities;
- at least one of said coupling cavities comprising a conductive element that is rotatable, thereby to vary the coupling offered by that coupling cavity;
- wherein the conductive element is sealed off from said accelerating cavities by means of an electrically insulating partition.
Dependencies are inferred from the claim text.