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Effect of local E×B flow shear on the stability of magnetic islands in tokamak plasmas

Phys. Plasmas 16, 052502 (2009); doi:10.1063/1.3126964

Published 8 May 2009

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R. Fitzpatrick and F. L. Waelbroeck
Department of Physics, Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712, USA
The influence of local E×B flow shear on a relatively wide, constant-psi, magnetic island embedded in a large-aspect-ratio, low-beta, circular cross-section tokamak plasma is examined, using a slab approximation to model the magnetic geometry. It is found that there are three separate solution branches characterized by low, intermediate, and high values of the shear. Flow shear is found to have a stabilizing effect on island solutions lying on the low and high shear branches, via a nonlinear modification of the ion polarization term in the Rutherford island width evolution equation, but to have a destabilizing effect on solutions lying on the intermediate shear branch. Moreover, the effect is independent of the sign of the shear. The modification of island stability by local E×B flow shear is found to peak when the magnitude of the shear is approximately vi/Ls, where vi is the ion thermal velocity, and Ls the magnetic shear length. ©2009 American Institute of Physics
History: Received 7 January 2009; accepted 10 April 2009; published 8 May 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/052502/1
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