This book gives an overview of modern cathodes and electron
emitters for vacuum tubes and vacuum electron devices in general.
It covers the latest developments in field emission theory as well
as new methods towards improving thermionic and cold cathodes. It
addresses thermionic cathodes, such as oxide cathodes, impregnated
and scandate cathodes, as well as photocathodes and field emitters
- the latter comprising carbon nanotubes, graphene and Spindt-type
emitter arrays. Despite the rise and fall of the once dominant
types of vacuum tubes, such as radio valves and cathode ray tubes,
cathodes are continually being improved upon as new applications
with increased demands arise, for example in electron beam
lithography, high-power and high-frequency microwave tubes,
terahertz imaging and electron sources for accelerators. Written by
17 experts in the field, the book presents the latest developments
in cathodes needed for these applications, discussing the state of
the art and addressing future trends.
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