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

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 de...

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Bibliographic Details
Published in:Applied physics letters 2015-09, Vol.107 (13)
Main Authors: He, W., Zhang, L., Bowes, D., Yin, H., Ronald, K., Phelps, A. D. R., Cross, A. W.
Format: Article
Language:English
Subjects:
Applied physics
Backward waves
Broadband
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CURRENT DENSITY
CURRENTS
ELECTRIC POTENTIAL
ELECTRON BEAMS
GHZ RANGE 100-1000
LANGMUIR FREQUENCY
MAGNETIC FIELDS
Maximum power
OSCILLATORS
Plasma
PLASMA WAVES
PULSES
Wave interaction
Wave propagation
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Summary: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 108 A m−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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4932099