E2v Technologies (uk) Limited

Alan Edward Wheelhouse

Steven Aitken

Stephen Bardell

Edward Stanley Sobieradzki

Stuart William Andrews

Neil O'Sullivan

Neil O'sullivan

An electron beam tube () having a longitudinal axis comprises a first component, such as a ceramic wall () and a second component such as a drift tube assembly having a mounting plate (). The tube further comprises means, such as member (), arranged to allow relative sliding movement of the first component relative to the second component in a radial direction. The invention helps to alleviate mechanical stresses caused by differential thermal expansion of the components.

Electron beam tubes

A collector for an electron beam tube comprises a plurality of electrode stages. The electrode stages are spaced from one another by a non-conductive spacer. The non-conductive spacer is located between portions of electrodes and extends into the collector on a first side and out of the collector on a second side. The non-conductive spacer has an inner portion extending into the collector and an outer portion extending out of the collector and a waisted portion there between. The spacer is held at the waisted portion.

Collector arrangement

A linear electron beam tube comprises an electron gun having a cathode and a grid, and an anode arranged in a first portion of a drift tube. The drift tube is within a vacuum envelope and has first and second portions separated by a gap at which point an electron beam, density modulated with an input RF signal is inductively coupled to an output cavity. The vacuum envelope is partially defined by a cylindrical ceramic wall and a pair of ferromagnetic pole pieces at its ends that form a DC magnetic circuit. The pole pieces extend radially beyond the vacuum envelope. At least those parts of the surface of the pole pieces that are in the RF path are coated with a layer of relatively low RF loss material such as copper. A balance ring separates the ceramic from the pole pieces. Further reduction in RF losses and relief from thermal stresses is obtained by forming the balance ring from the same ceramic as the cylindrical wall and metallizing at least that part of the outer surface of the balance ring that is on the RF path.

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Braintree, United Kingdom

Alan Edward Wheelhouse