Abstract-Study of a high-order mode terahertz backward wave ocsillator driven by multiple sheet electron beams

G. X. Shu, C. Q. Zhou, H. Xiong,  L. Chen, Z. F. Qian,  G. Liu,

https://ieeexplore.ieee.org/document/9015763

The concept of achieving powerful terahertz radiation by the interaction between high-order mode backward wave and multiple sheet electron beams is proposed to increase the operating frequency of the backward wave oscillator (BWO) to a high level such as over 1 THz. For the high-order mode operation, an orthogonal grating waveguide slow wave structure is proposed. Particle-in-cell simulations show that the high-order mode BWO can generate over 0.84 W power in the frequency range of 1.20-1.32 THz. The proposed methodology provides a potential solution to develop compact terahertz radiation sources with high output power and broad tunable bandwidth.

Abstract-Simulation study of a high-order mode terahertz radiation source based on an orthogonal grating waveguide and multiple sheet electron beams

G. X. Shu, G. Liu, and Z. F. Qian

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-7-8040

Generally, it is difficult for the common backward wave oscillator (BWO) to produce powerful THz radiation when the operating frequency increases to a high level such as over 1 THz due to the very small structural dimensions. The concept of generating powerful THz radiation from the interaction between high-order mode THz wave and multiple sheet electron beams is a promising solution to address the issue. For the high-order mode operation, a novel orthogonal grating waveguide is proposed, which is relatively ease of fabrication compared with the overmoded structure based on the double staggered grating waveguide. A high-order mode BWO based on the orthogonal grating waveguide and multiple sheet electron beams is studied by simulations. Particle-in-cell simulations show that the BWO can provide over 1.08 W power in the frequency range of 1.18-1.30 THz. Such a methodology opens up a new way to extend the BWO’s operating frequency to a higher level and provides a potential solution for developing compact powerful THz radiation sources with wide tunable bandwidth.

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Abstract-Experimental demonstration of a terahertz extended interaction oscillator driven by a pseudospark-sourced sheet electron beam

G. X. Shu, L. Zhang,   H. Yin, J. P. Zhao,   A. D. R. Phelps, A. W. Cross, G. Liu, Y. Luo, Z. F. Qian,  W. He

http://aip.scitation.org/doi/abs/10.1063/1.5011102

We have recently proposed to combine the advantages of a pseudospark-sourced sheet electron beam (PS-SEB) with a planar slow wave structure to generate high power terahertz radiation. To verify this idea, experimental investigation of an extended interaction oscillator based on the PS-SEB has been conducted and presented. A PS-SEB of approximately 1.0 mm × 0.17 mm in size with 21.5 A peak current (1.26 × 104 A/cm2 beam current density) and 34.5 kV peak voltage was measured after propagating a distance of 10-mm without the need of an external focusing magnetic field. A radiation pulse of ∼35 ns in duration and an output power of over 10 W at a frequency of ∼0.2 THz were measured.