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A long-pulse millimeter-wave free electron maser

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4 Author(s)
Boehmer, H. ; TRW Space & Technol., Redondo Beach, CA, USA ; Christensen, T. ; Caponi, M.Z. ; Hauss, B.

An experimental free electron maser (FEM) facility is described which operates in the millimeter-wave regime. The experiment demonstrates that high gain and beam extraction efficiency can be obtained with low-current but high-quality electron beams. In the oscillator configuration, microwave powers of 110 kW were achieved with a 300-kV, 4-A beam, corresponding to a beam extraction efficiency of 9.2%. At low beam currents, with the system operating in the linear regime, the FEM gain curve was measured. The experiment uses a Pierce-type gun with a calculated beam emittance of 10.7-mm mrad at 300 kV and 4 A. The wiggler is of the iron permanent magnet hybrid design. The experiment is intended as a first step towards the development of continuous-wave (CW) devices that use beam energy recovery to make use of low-current, high-voltage power supplies

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Plasma Science, IEEE Transactions on  (Volume:18 ,  Issue: 3 )