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Zonal flow and GAM dynamics and associated transport characteristics in reversed shear tokamaks

Published online by Cambridge University Press:  20 December 2006

NAOAKI MIYATO ,
YASUAKI KISHIMOTO  and
JIQUAN LI
NAOAKI MIYATO
Affiliation:
Japan Atomic Energy Research Institute, 801-1 Mukouyama, Naka 311-0193, Japan
YASUAKI KISHIMOTO
Affiliation:
Japan Atomic Energy Research Institute, 801-1 Mukouyama, Naka 311-0193, Japan Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan
JIQUAN LI
Affiliation:
Southwestern Institute of Physics, Chengdu, People's Republic of China
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Abstract

Zonal flow behaviour and its effect on turbulent transport in reversed magnetic shear tokamaks are investigated by global simulations of electrostatic ion temperature gradient driven turbulence. When the safety factor $q$ is reduced, zonal flows in a minimum $q$ region change from oscillatory to stationary and suppress the turbulent transport effectively. This result indicates that the change of zonal flow behaviour in the minimum $q$ region may trigger the formation of ion transport barriers.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 821 - 824
Copyright
2006 Cambridge University Press

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