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Nonlinear Stability and Saturation of Ballooning Modes in Tokamaks.

作者信息

Ham C J, Cowley S C, Brochard G, Wilson H R

机构信息

CCFE, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom.

York Plasma Institute, Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom.

出版信息

Phys Rev Lett. 2016 Jun 10;116(23):235001. doi: 10.1103/PhysRevLett.116.235001. Epub 2016 Jun 9.

DOI:10.1103/PhysRevLett.116.235001
PMID:27341237
Abstract

The theory of tokamak stability to nonlinear "ballooning" displacements of elliptical magnetic flux tubes is presented. Above a critical pressure profile the energy stored in the plasma may be lowered by finite (but not infinitesimal) displacements of such tubes (metastability). Above a higher pressure profile, the linear stability boundary, such tubes are linearly and nonlinearly unstable. The predicted saturated flux tube displacement can be of the order of the pressure gradient scale length. Plasma transport from these displaced flux tubes may explain the rapid loss of confinement in some experiments.

摘要

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