Generation of broadband terahertz radiation using a backward wave oscillator and pseudospark-sourced electron beam

He, W. and Zhang, L. and Bowes, D. and Yin, H. and Ronald, K. and Phelps, A. D. R. and Cross, A. W. (2015) Generation of broadband terahertz radiation using a backward wave oscillator and pseudospark-sourced electron beam. Applied Physics Letters, 107 (13). 133501. ISSN 0003-6951

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    Abstract

    This paper presents for the generation of a small size high current density pseudospark (PS) electron beam for a high frequency (0.2 THz) Backward Wave Oscillator (BWO) through a Doppler up-shift of the plasma frequency. An electron beam ∼1 mm diameter carrying a current of up to 10 A and current density of 1E8 Am􀀀2, with a sweeping voltage of 42 to 25 kV and pulse duration of 25 ns was generated from the PS discharge. This beam propagated through the rippled-wall slow wave structure of a BWO beam-wave interaction region in a plasma environment without the need for a guiding magnetic field. Plasma wave assisted beam-wave interaction resulted in broadband output over a frequency range of 186 - 202 GHz with a maximum power of 20 W.