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Effects of ballooning instability on tokamak confinement

Published online by Cambridge University Press:  13 March 2009

Guoyong Fu  and
J. W. Van Dam
Guoyong Fu
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A.
J. W. Van Dam
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A.
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Abstract

Using the ballooning-mode transport model proposed by Connor, Taylor & Turner (1984), we derive the thermal conductivity induced by ideal ballooning instability and compare it to experimental observations from auxiliary-heated tokamaks. We show how this model can be improved by means of a finite-beta equilibrium and also apply it to obtain a confinement scaling law for high-beta, purely Ohmically heated tokamaks. Finally, we employ this transport mode to find that tokamaks with supplemental stabilization, for example due to gyroradius, energetic particle or shaping effects, can self-consistently access the second stability regime at rather high heating power.

Type
Research Article
Information
Journal of Plasma Physics , Volume 39 , Issue 1 , February 1988 , pp. 11 - 25
Copyright
Copyright © Cambridge University Press 1988

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References

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