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Title:
Ion Landau damping and drift tearing modes
Authors:
Connor, J. W.; Ham, C. J.; Hastie, R. J.; Zocco, A.
Affiliation:
AA(UKAEA-CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK), AB(UKAEA-CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK), AC(UKAEA-CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK), AD(Max-Planck- Institut fur Plasmaphysik, 17491 Greifswald, Germany)
Publication:
Journal of Plasma Physics, Volume 85, Issue 2, article id. 905850204, 16 pp.
Publication Date:
04/2019
Origin:
CUP
Keywords:
fusion plasma, plasma instabilities
Abstract Copyright:
(c) 2019: © Crown Copyright. Published by Cambridge University Press 2019
DOI:
10.1017/S0022377819000217
Bibliographic Code:
2019JPlPh..85b9004C

Abstract

Kinetic treatments of drift tearing modes that match an inner, resonant layer solution to an external magnetohydrodynamic (MHD) solution, characterised by > 𝛥\prime >, can fail to match the ideal MHD boundary condition on the parallel electric field, > E\Vert =0 >. In this paper we demonstrate how consideration of ion sound and ion Landau damping effects achieves this, placing the theory on a firm footing. These effects are found to modify the effective critical > 𝛥\prime > for instability of drift tearing modes, in particular for weak electron temperature gradients. The implications for a realistic hot plasma resonant layer model - involving large ion Larmor radius and semi-collisional electron physics (Connor et al., Plasma Phys. Control. Fusion, vol. 54, 2012, 035003) - are determined.
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