Abstract
A disk-loaded coupled cavity structure operating in the quasi-TM03 mode has been used here to develop a high electron efficiency, high output power terahertz radiation source, demonstrating that it is possible to concentrate the axial field energy along the source’s central axis within a large cavity. Compared with traditional extended interaction devices operating at the same frequency band, the operating mode of this present device provides a sizable beam tunnel capacity that can support efficient energy conversion between the electron beam and the high frequency field. The developed electron optical system is based on a cylindrical electron beam of 0.3 mm radius and is capable of producing a beam current of 0.65 A at a bias of 16.4 kV. Particle in cell simulations show that such new design approaches can achieve kilowatt-level output power at 0.22 THz with a high electron efficiency of 11.5%.
Highlights
Such devices have low high frequency (HF) field energy in the axial direction of the interaction region. Operating in such higher-order mode circuits generally lowers the resonators’ characteristic impedance, which makes it possible to be suppressed by fundamental modes. In response to these challenges, here, we report on a THz extended interaction device for a disk-loaded coupled cavity operating in the quasi-TM03 mode
By operating in a higher-order mode, a high power capacity has been obtained and the axial field energy has been concentrated on and near the central axis compared to conventional Vacuum electronic devices (VEDs)
The sheet electron beam may provide the same level of beam tunnel capacity, it is extremely challenging to compress and focus the electrons due to its narrow and flat structure design
Summary
Advances in microfabrication technology and new security threat considerations have stimulated intense interest in the development of ever more powerful, coherent sources of millimeter-wave (MMW) to terahertz (THz) electromagnetic radiation sources with emission ranging from 0.1 to 10 THz. Due to its wide bandwidth, high directionality, and commensurate high spatial and temporal resolution, a wide variety of new applications have come to the fore, including deep space research, advanced communications, novel radar, remote high-resolution imaging, border protection, threat detection, biological spectroscopy, and biomedical diagnostics.. As operating frequencies continue to increase further toward the THz regime, more energy is lost in the form of heat This severely restricts the output power and electronic efficiency of the circuit. Higher-order mode operation has been explored and applied to the ladder-type cavity.23 Such devices have low HF field energy in the axial direction of the interaction region. Operating in such higher-order mode circuits generally lowers the resonators’ characteristic impedance, which makes it possible to be suppressed by fundamental modes In response to these challenges, here, we report on a THz extended interaction device for a disk-loaded coupled cavity operating in the quasi-TM03 mode. Through parametrically optimized particle in cell (PIC) simulation, such new design approaches have demonstrated the superior HF field and beam interaction and in doing open up new technological prospects for the promotion of plasma physics related to the field of generating powerful radiation output from the MMW to THz regime
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