Abstract
A relativistic electron beam propagating through a plasma in the ion-focused regime exhibits an electromagnetic instability with peak growth rate near a resonant frequency {omega}{similar to}2{gamma}{sup 2}{omega}{sub {beta}}. Growth is enhanced by optical guiding in the ion channel, which acts as a dielectric waveguide, with fiber parameter {ital V}{similar to}1({ital I}/{ital I}{sub {ital A}}){sup 1/2}. A 1D theory for a laser making use of this instability is formulated, scaling laws are derived, and numerical examples are given. Possible experimental evidence is noted.
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