Simultaneous Analysis of Ech Modulation and Sawtooth Activity in the Plasma Core of the Rtp Tokamak

TitleSimultaneous Analysis of Ech Modulation and Sawtooth Activity in the Plasma Core of the Rtp Tokamak
Publication TypeJournal Article
Year of Publication1994
AuthorsA. Jacchia, F. De Luca, G.MD Hogeweij, G. Gorini, J.A Konings, N.JL Cardozo, P. Mantica, M. Peters
JournalNuclear Fusion
Volume34
Number12
Pagination1629-1639
Date PublishedDec
ISBN Number0029-5515
Abstract

A model for the interaction between the sawtooth instability (ST) and modulated electron cyclotron heating (MECH) is presented and tested against electron temperature measurements in RTP tokamak plasmas. The simultaneous analysis of the ECH and ST induced heat waves, including the effect of their interaction, allows the extension of the determination of the incremental electron diffusivity (chi(inc)) to the plasma core region. The experimental data can be interpreted, in the typical range of frequencies of the RTP experiment (300-1500 Hz), in terms of a perturbed heat flux with a low (less than or similar to 0.3 m(2)/s) chi(inc) value inside the sawtoothing region and a larger (approximate to 5-6 m(2)/s) chi(inc) value outside with a sharp transition. A non-adiabatic sawtooth crash model provides a better fit to the RTP sawtooth heat pulse data than does an adiabatic crash model.

DOI10.1088/0029-5515/34/12/i07
PID

0a502c892da3054f47e46ab07621138d

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