Electron beam tube collector having ceramic shielding means
AssigneeEEV Limited
InventorsRoy Heppinstall, Steven Bardell, Stuart William Andrews
Life of this patent
Estimating the term…
Abstract
In an electron beam tube such as a klystron, a vacuum seal comprises a ceramic cylindrical wall on which are brazed metal rings which are welded to flares and fixed to electrodes and of a collector. Ceramic rings and are located between the metal ring and the electrodes. The cylindrical wall includes inner flanges which overlap the inner peripheries of the metal rings hence reducing the likelihood of arcing occurring between them and other parts of the arrangement at different potentials. In other embodiments of the invention, the ceramic rings are extended to shield the inner edges of the metal rings or a separate ceramic tube is positioned within the metal rings to provided shielding.
Claims20
An electron beam tube comprising:
- an electron gun;
- input means for coupling electromagnetic energy into said tube;
- output means for coupling electromagnetic energy out of said tube;
- an interaction structure at which an electron beam propagating from said electron gun interacts with electromagnetic energy coupled into said tube by said input means;
- and a vacuum envelope, said tube further comprising a ceramic cylindrical wall having an end face;
- an annular metal ring having an inner periphery;
- and an annular ceramic ring having an end face, said ceramic wall, said metal ring and said ceramic ring coaxially surrounding an axis along which said electron beam propagates, said metal ring being located between said end face of said ceramic wall and said end face of said ceramic ring, said ceramic wall and said metal ring defining part of said vacuum envelope;
- and said tube including ceramic material located radially inwardly of said inner periphery of said metal ring and being coextensive with said inner periphery in an axial direction, whereby said ceramic material shields said metal ring from arcing.
A vacuum envelope for an electron beam tube including an electron gun;
- input means for coupling electromagnetic energy into said tube;
- output means for coupling electromagnetic energy out of said tube;
- and an interaction structure at which an electron beam propagating from said electron gun interacts with electromagnetic energy coupled into said tube by said input means, said vacuum envelope comprising a ceramic cylindrical wall having an end face;
- and an annular metal ring having an inner periphery;
- and an annular ceramic ring having an end face, said ceramic wall, metal ring and ceramic ring coaxially surrounding an axis along which said electron beam propagates, with said metal ring being located between said end face of said ceramic wall and said end face of said ceramic ring, said ceramic wall and said metal ring defining part of said vacuum envelope;
- and said envelope including ceramic material located radially inwardly of said inner periphery of said metal ring and being coextensive with said inner periphery in an axial direction, whereby said ceramic material shields said metal ring from arcing.
A multi-staged collector for an electron beam tube including an electron gun;
- input means for coupling electromagnetic energy into said tube;
- output means for coupling electromagnetic energy out of said tube;
- and an interaction structure at which an electron beam propagating from said electron gun interacts with electromagnetic energy coupled into said tube by said input means said collector comprising a plurality of annular electrodes surrounding an axis along which said electron beam propagates;
- and a vacuum envelope, said collector further comprising a ceramic cylindrical wall having an end face;
- and annular metal ring having an inner periphery;
- and an annular ceramic ring having an end face, said ceramic wall, metal ring and ceramic ring coaxially surrounding said axis with said metal ring being located between said end face of said ceramic wall and said end face of said ceramic ring, said ceramic wall and said metal ring defining part of said vacuum envelope;
- and said collector including ceramic material located radially inwardly of said inner periphery if said metal ring and being coextensive with said inner periphery in an axial direction, whereby said ceramic material shields said metal ring from arcing.
Dependencies are inferred from the claim text.