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 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.
Highlights
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 mÀ2, 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 rippledwall slow wave structure of a BWO beam-wave interaction region in a plasma environment without the need for a guiding magnetic field
The PS discharge can be initialized by a pulsed voltage;5 the whole device including the voltage source could be fitted in a hand-held volume and weight and operated in a torch-like fashion
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 mÀ2, with a sweeping voltage of 42 to 25 kV and pulse duration of 25 ns, was generated from the PS discharge.
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