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US 8,552,667 B2Granted
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.
Claims13
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;
- and
- an electrically insulating partition;
- wherein at least one of said coupling cavities comprises a conductive element that is rotatable, thereby to vary the coupling offered by that coupling cavity;
- wherein the electrically insulating partition defines a first region, containing the conductive element, having a first gaseous pressure, and a second region having a second gaseous pressure, the second gaseous pressure being lower than the first gaseous pressure.
2 more elements
Dependencies are inferred from the claim text.