Abstract
A large amplitude ion acoustic wave has potential as a wiggler to produce short wavelength coherent electromagnetic radiation in a free electron laser (FEL). The frequency of radiation is given as /spl omega//sub 1//spl sime/2/spl gamma//sub 0//sup 2/(/spl omega//sub 0//c/sub s/)/spl nu//sub b/ cos /spl theta//sub 0/, where /spl gamma//sub 0/ is the relativistic gamma factor, /spl omega//sub 0/ is the frequency of the ion acoustic wave propagating at angle /spl theta//sub 0/ with the electron beam and c/sub s/ is the sound speed. The growth time of the instability at 10 /spl mu/m turns out to be in the submicrosecond range at beam voltage /spl sim/1 MV and beam current /spl ap/1.5 A.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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