Millimeter wave free electron laser amplifiers: experiments and designs

S. W. Bidwell

doi:10.1117/12.2297954

1 October 1991 Millimeter wave free electron laser amplifiers: experiments and designs

S. W. Bidwell

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15766P (1991) https://doi.org/10.1117/12.2297954
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

Free electron laser amplifiers are investigated as sources of high-average-power (1 MW) millimeter to submillimeter wave radiation (200 GHz - 600 GHz) for application to electron cyclotron resonance heating of magnetically confined fusion plasmas. As a stepping-stone to higher frequencies and cw operation a pulsed amplifier (τ_pulse ≃ 80 ns) at 98 GHz is being developed. Status is reported on this experiment which investigates linear gain amplification with use of a sheet electron beam (transverse cross section = 0.1 cm × 2.0 cm, V_beam = 440 keV, I_beam ≃ 10 A) and short-period wiggler (l_w = 0.96 cm) and with expected output of 140 W. Predictions of gain and efficiency from a 1-D universal formulation are presented. Beam propagation results, with wiggler focusing as a means of sheet beam confinement in both transverse dimensions, through the 54 cm (56 period) pulsed electromagnet wiggler are discussed. Peak wiggler fields of 5.1 kG on-axis have been achieved.

Citation Download Citation

S. W. Bidwell "Millimeter wave free electron laser amplifiers: experiments and designs", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15766P (1 October 1991); https://doi.org/10.1117/12.2297954

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