Work

Optimized Quasi-Optical Mode Converter for TE33,12 in 210 GHz Gyrotron

Year: 2025

Type: article

Abstract: This article discusses the design of a high-performance quasi-optical mode converter for the TE33,12 mode at 210 GHz. The conversion process is challenging due to a caustic-to-cavity radius ratio of approximately 0.41. The mode converter employs an optimized dimpled wall launcher, analyzed using coupling mode theory with twenty-five coupled modes, compared to the usual nine modes and optimized reflector systems, to effectively address the conversion challenge.Electromagnetic field analysis within the launcher wall was optimized using MATLAB R2021b. The radiation fields from the launcher were analyzed in free space using Gaussian optics and vector diffraction theory. The mirror system consists of a quasi-elliptical mirror, an elliptical mirror, and phase-corrected parabolic mirrors. Following phase correction, the output window achieved a scalar Gaussian mode content of 99.0% and a vector Gaussian mode content of 97.4%.

Source: Micromachines

DOI: 10.3390/mi16030308

Authors: Hamid Sharif, Muhammad Haris Jamil, Wenlong He

Institution: Shenzhen University

Language: English

Topic: Gyrotron and Vacuum Electronics Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,534

Funder: Shenzhen Science and Technology Innovation Program