A model for electron transport barriers in tokamaks, tested against experimental data from RTP

TitleA model for electron transport barriers in tokamaks, tested against experimental data from RTP
Publication TypeJournal Article
Year of Publication1998
AuthorsG.MD Hogeweij, N.JL Cardozo, MR de Baar, A.M.R. Schilham
JournalNuclear Fusion
Volume38
Number12
Pagination1881-1891
Date PublishedDec
ISBN Number0029-5515
Abstract

Recent experiments in the RTP tokamak have shown that the electron temperature, T-e, profile in EC heated L mode discharges can have only a small number of distinct profile shapes, depending on the location of the additional heating. The sharp transitions between the profile shapes are associated with the loss or gain of a low rational q surface. These observations suggest that the electron thermal diffusivity chi(e) is a direct function of the safety factor q, with alternating layers of low and high chi(e). It is shown that such a model not only excellently describes the distinct profile shapes but also predicts other, observed but so far unexplained, phenomena, such as sharp off-axis maxima of T-e observed with off-axis heating at specific radii.

DOI10.1088/0029-5515/38/12/312
PID

fc4c33aa0a3bdb2a87e5de693a0e26ca

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