{"title":"Broadband Cherenkov Amplifier with a Coaxial Plasma-Dielectric Electrodynamic System","authors":"A. V. Ershov, M. V. Kuzelev","doi":"10.1134/S1063780X25602962","DOIUrl":null,"url":null,"abstract":"<p>An electromagnetic wave amplifier based on the forced Cherenkov effect of a relativistic thin tubular electron beam in a coaxial waveguide with a plasma-dielectric filling is considered. In the linear approximation, a dispersion equation is derived, amplified frequency domains are defined, and wave amplification factors are calculated. Two maximum amplification modes were studied depending on the beam-dielectric gap and frequency. The nonlinear dynamics of the amplification process was investigated. Amplification efficiencies for different beam currents and different frequencies of the amplified signal were determined. The effect of plasma on wave amplification in a coaxial waveguide with a dielectric insert was studied in detail. The interaction of the beam with the potential Langmuir wave in plasma was shown to affect but slightly the amplification of electromagnetic waves.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"51 5","pages":"576 - 598"},"PeriodicalIF":1.1000,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plasma Physics Reports","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1063780X25602962","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, FLUIDS & PLASMAS","Score":null,"Total":0}
引用次数: 0
Abstract
An electromagnetic wave amplifier based on the forced Cherenkov effect of a relativistic thin tubular electron beam in a coaxial waveguide with a plasma-dielectric filling is considered. In the linear approximation, a dispersion equation is derived, amplified frequency domains are defined, and wave amplification factors are calculated. Two maximum amplification modes were studied depending on the beam-dielectric gap and frequency. The nonlinear dynamics of the amplification process was investigated. Amplification efficiencies for different beam currents and different frequencies of the amplified signal were determined. The effect of plasma on wave amplification in a coaxial waveguide with a dielectric insert was studied in detail. The interaction of the beam with the potential Langmuir wave in plasma was shown to affect but slightly the amplification of electromagnetic waves.
期刊介绍：
Plasma Physics Reports is a peer reviewed journal devoted to plasma physics. The journal covers the following topics: high-temperature plasma physics related to the problem of controlled nuclear fusion based on magnetic and inertial confinement; physics of cosmic plasma, including magnetosphere plasma, sun and stellar plasma, etc.; gas discharge plasma and plasma generated by laser and particle beams. The journal also publishes papers on such related topics as plasma electronics, generation of radiation in plasma, and plasma diagnostics. As well as other original communications, the journal publishes topical reviews and conference proceedings.
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