Particle Flow during Sawtooth Reconnection: Numerical Simulations of Experimental Observations

Particle Flow during Sawtooth Reconnection: Numerical Simulations of Experimental Observations

The core plasma density in ohmic, sawtoothing regime in Tore Supra and JET tokamaks measured by fast-sweeping reflectometry develops a central peak. This peak is surrounded by a density plateau, which extends up to the q = 1 reconnection surface. Such mexican hat like profiles differ from the smooth...

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Veröffentlicht in:Plasma and Fusion Research 2013/11/15, Vol.8, pp.2402131-2402131
Hauptverfasser: NICOLAS, Timothée, SABOT, Roland, GARBET, Xavier, LÜTJENS, Hinrich, LUCIANI, Jean-François, SIRINELLI, Antoine, DECKER, Joan, MERLE, Antoine, Contributors, JET-EFDA
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Plasma Physics
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container_title Plasma and Fusion Research
container_volume 8
creator NICOLAS, Timothée
SABOT, Roland
GARBET, Xavier
LÜTJENS, Hinrich
LUCIANI, Jean-François
SIRINELLI, Antoine
DECKER, Joan
MERLE, Antoine
Contributors, JET-EFDA
description The core plasma density in ohmic, sawtoothing regime in Tore Supra and JET tokamaks measured by fast-sweeping reflectometry develops a central peak. This peak is surrounded by a density plateau, which extends up to the q = 1 reconnection surface. Such mexican hat like profiles differ from the smooth dome of the temperature profile. Detailed tomographic reconstructions of the density in the poloidal plane show the development of crescent and ring structures during the sawtooth cycle. 3D full MHD nonlinear simulations with the XTOR-2F code recover these structures and show that they can be explained by the MHD activity related to the sawtooth instability. They show also that the electron density evolution is dominated by the perpendicular MHD flows, while the temperature, obtained with ECE measurements is dominated by parallel diffusion.
doi_str_mv 10.1585/pfr.8.2402131
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subjects Computational Physics
Physics
Plasma Physics
title Particle Flow during Sawtooth Reconnection: Numerical Simulations of Experimental Observations
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