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Tokamak turbulence at the scrape-off layer in TCABR with an ergodic magnetic limiter

Published online by Cambridge University Press:  01 June 2007

M. V. A. P. HELLER ,
I. L. CALDAS ,
A. A. FERREIRA ,
E. A. O. SAETTONE  and
A. VANNUCCI
M. V. A. P. HELLER
Affiliation:
Institute of Physics, University of São Paulo, C. P. 66318, 05315-970 São Paulo, SP, Brazil
I. L. CALDAS
Affiliation:
Institute of Physics, University of São Paulo, C. P. 66318, 05315-970 São Paulo, SP, Brazil
A. A. FERREIRA
Affiliation:
Institute of Physics, University of São Paulo, C. P. 66318, 05315-970 São Paulo, SP, Brazil
E. A. O. SAETTONE
Affiliation:
Institute of Physics, University of São Paulo, C. P. 66318, 05315-970 São Paulo, SP, Brazil
A. VANNUCCI
Affiliation:
Institute of Physics, University of São Paulo, C. P. 66318, 05315-970 São Paulo, SP, Brazil
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Abstract

The influence of an ergodic magnetic limiter (EML) on plasma turbulence is investigated in the Tokamak Chauffage Alfvén Brésilien (TCABR), a tokamak with a peculiar natural superposition of the electrostatic and magnetic fluctuation power spectra. Experimental results show that the EML perturbation can reduce both the magnetic oscillation and the electrostatic plasma turbulence. Whenever this occurs, the turbulence-driven particle transport is also reduced. Moreover, a bispectral analysis shows that the nonlinear coupling between low- and high-frequency electrostatic fluctuations increases significantly with the EML application.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 3 , June 2007 , pp. 295 - 306
Copyright
Copyright © Cambridge University Press 2006

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