Abstract
Currently ongoing at Los Alamos National Laboratory is a program to develop high-power, planar 100--300 GHz traveling-wave tubes. A necessary part of this effort is a sheet electron beam source. Previously, we have described a novel asymmetric solenoid lens concept for transforming the circular beam from a high-perveance electron gun to a planar configuration. The lens is a standard electromagnetic solenoid with elliptical, instead of circular, pole apertures. The elliptical pole openings result in asymmetric focusing, which in turn forms an elliptical sheet beam suitable for our planar structures. Here we report the first experimental demonstration of this lens.
Highlights
INTRODUCTIONThere is an emerging need for high-power (up to several kilowatts), high-frequency (100 –300 GHz), highbandwidth (up to 10%) rf sources for advanced radar and communications
There is an emerging need for high-power, high-frequency (100 –300 GHz), highbandwidth rf sources for advanced radar and communications
Previous work at Los Alamos National Laboratory has identified that sheet-beam driven travelingwave tubes (TWTs) can meet this need [1,2,3]. This type of rf source consists of a very thin electron beam passing through a planar, periodic slow-wave structure [1]
Summary
There is an emerging need for high-power (up to several kilowatts), high-frequency (100 –300 GHz), highbandwidth (up to 10%) rf sources for advanced radar and communications. Previous work at Los Alamos National Laboratory has identified that sheet-beam driven travelingwave tubes (TWTs) can meet this need [1,2,3] This type of rf source consists of a very thin electron beam passing through a planar, periodic slow-wave structure [1]. There are two possible ways to construct this electron source: (1) by constructing a sheet-beam electron gun that directly produces a sheet beam; and (2) by transforming the beam from a conventional circular gun using a conversion element. We felt the latter approach provided a more flexible and potentially more useful beam source. In this paper we report the first experimental results of the lens’ performance
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