Abstract
Free electron laser amplifiers are tunable sources under development as high power, high frequency radiation sources for magnetic fusion applications. High efficiencies can be achieved by varying the wiggler field strength and/or the wiggler period. In addition to the requirement of high efficiency, the free electron laser must be tunable for electron cyclotron heating and current drive applications in magnetic fusion devices. Although the tunability of free electron lasers is well established, the tunability of a tapered free electron laser amplifier has not been studied. In this paper we present an investigation of the tunability of a tapered wiggler free electron laser amplifier operating in the neighborhood of 94 GHz. The configuration of the free electron laser is one in which a sheet electron beam propagates through a rectangular waveguide in the presence of a planar wiggler field with tapered period. We found that the tapered free electron laser amplifier is tunable over a reasonably wide range of frequencies by small adjustments in the energy and current of the electron beam.
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