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Affiliation of Author(s):[1]Univ Elect Sci & Technol China, Sch Phys Elect, Chengdu 610054, Sichuan, Peoples R China

Journal:IEEE ELECTRON DEVICE LETTERS

Key Words:Diffractive-wave feedback mechanism; rf circuits; confocal gyro-TWAs

Abstract:In this letter, diffractive-wave feedback mechanism of confocal gyrotron travelling-wave amplifiers (gyro-TWAs) is presented and verified in cold-test experiments for the first time. The reason for this physical mechanism is that part of the diffractive wave re-enters the open circuit during outward radiation. The achieved circuit loss is less than the theoretical predictions without considering the feedback. This abnormal behavior will seriously deteriorate the stability of the amplifiers including potential near-cutoff instability and backward-wave oscillation, presenting as a main factor that greatly degrades the performance of confocal gyro-TWAs, especially in high-gain operation.

First Author:Yelei Yao et al.

Document Type:Article

Volume:39

Issue:3

Page Number:436-439

ISSN No.:0741-3106

Translation or Not:no

Release time:2025-05-23