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US 9,318,296 B2Granted
Magnetron
AssigneeE2V Technologies (UK) Limited
InventorsDavid Bernard Fox, Timothy Peter Fox, Scott Williams
Life of this patent
Estimating the term…
Abstract
A cathode of a magnetron having a radial extension to accommodate the cathode terminals is supported by arms which have a greater diameter over the region in which they are supported in the glass thimble than over the region of the free ends. This shifts any vibrations to a higher frequency band, which is less liable to be excited in the event the magnetron is moved rapidly as in a linac used for radiotherapy purposes.
Claims5
A magnetron, comprising:
- a cathode having an axis;
- a vacuum envelope including a glass portion extending radially relative to the axis of the cathode;
- an anode having a cylindrical anode wall surrounding the cathode;
- a pair of electrically conducting support arms mounted vacuum-tight in a wall of the glass portion of the vacuum envelope and having free ends located exterior to the cylindrical anode wall;
- and
- leads connecting the free ends of the support arms to the cathode, the support arms supporting the cathode via the leads,
- wherein each of the support arms has a first portion having a first diameter extending over a region of mounting in the glass portion, and each of the support arms has a second portion extending from the free ends to the first portion and having a second diameter that is smaller than the first diameter thereby to increase a resonant frequency of the support arms.
4 more elements
Dependencies are inferred from the claim text.