{"title":"Electron Cyclotron Emission Diagnostics from the Low Field Side at the T-15MD Tokamak: Concept and Estimates of Operational Limits","authors":"N. A. Solovev, D. A. Shelukhin","doi":"10.1134/S1063780X25604493","DOIUrl":null,"url":null,"abstract":"<p>A concept of the electron cyclotron emission diagnostic from the low field side of the T-15MD tokamak is presented. The diagnostic is intended for measuring the plasma electron temperature profile in the equatorial plane using the electron cyclotron emission spectrum of the extraordinary mode at the second harmonic of the electron cyclotron resonance frequency. To achieve this, it is planned to use a 96-channel heterodyne scheme with double frequency down-conversion in conjunction with a quasi-optical focusing system that would shape the received wave beam. Under typical expected plasma parameters, the limits of the applicability region of the diagnostic were estimated in the geometrical optics approximation. This region is limited by cut-off, insufficient optical depth, and harmonic overlap. The spatial resolution of the diagnostic also was estimated.</p>","PeriodicalId":735,"journal":{"name":"Plasma Physics Reports","volume":"52 2","pages":"162 - 178"},"PeriodicalIF":1.1000,"publicationDate":"2026-04-16","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/S1063780X25604493","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}
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Abstract
A concept of the electron cyclotron emission diagnostic from the low field side of the T-15MD tokamak is presented. The diagnostic is intended for measuring the plasma electron temperature profile in the equatorial plane using the electron cyclotron emission spectrum of the extraordinary mode at the second harmonic of the electron cyclotron resonance frequency. To achieve this, it is planned to use a 96-channel heterodyne scheme with double frequency down-conversion in conjunction with a quasi-optical focusing system that would shape the received wave beam. Under typical expected plasma parameters, the limits of the applicability region of the diagnostic were estimated in the geometrical optics approximation. This region is limited by cut-off, insufficient optical depth, and harmonic overlap. The spatial resolution of the diagnostic also was estimated.
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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