{"title":"A model for anomalous thermal diffusivity in tokamaks","authors":"A. Hirose","doi":"10.1109/PLASMA.1989.165994","DOIUrl":null,"url":null,"abstract":"It has been recently pointed out that a certain function F of the plasma density, n(r), and the electron temperature gradient relative to the density gradient, eta /sub e/(r), reproduces well the radial profiles of chi /sub e/ (electron thermal diffusivity) in several tokamaks with various heating modes. Plots are shown of F with n=10/sup 19//m/sup 3/ and the experimentally deduced chi /sub e/ (m/sup 2//s) in three different modes in JET: ohmic, ohmic+ICRH, and ohmic+NBI. The F and chi /sub e/ profiles agree rather well. The factor 1+ eta /sub e/, which appears in the numerator of F, is proportional to the pressure gradient, which may provide a source for drift-type instability. The electron temperature gradient, which appears in the denominator, is possibly due to the nonlinear stabilization of drift-type modes by temperature gradient.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"6 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE 1989 International Conference on Plasma Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/PLASMA.1989.165994","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
It has been recently pointed out that a certain function F of the plasma density, n(r), and the electron temperature gradient relative to the density gradient, eta /sub e/(r), reproduces well the radial profiles of chi /sub e/ (electron thermal diffusivity) in several tokamaks with various heating modes. Plots are shown of F with n=10/sup 19//m/sup 3/ and the experimentally deduced chi /sub e/ (m/sup 2//s) in three different modes in JET: ohmic, ohmic+ICRH, and ohmic+NBI. The F and chi /sub e/ profiles agree rather well. The factor 1+ eta /sub e/, which appears in the numerator of F, is proportional to the pressure gradient, which may provide a source for drift-type instability. The electron temperature gradient, which appears in the denominator, is possibly due to the nonlinear stabilization of drift-type modes by temperature gradient.<>
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