Abstract
We examine here the effects of plasmas and beam slippage on the gain of an optical klystron (OK) free electron laser (FEL) device under the influence of a weak guiding magnetic field and background plasma. The beam energy spread decreases with background plasma density n o p and increases with beam plasma density n o b . The maximum gain ( G max ) scales proportional to n o p 2 . The beam slippage phase Δ ψ scales directly to five power of relativistic factor γ 0 and one half power to n o b .
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