Sign on
ADS Classic is now deprecated. It will be completely retired in October 2019. Please redirect your searches to the new ADS modern form or the classic form. More info can be found on our blog.

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· References in the article
· Citations to the Article (2) (Citation History)
· Refereed Citations to the Article
· Reads History
·
· Translate This Page
Title:
Analytical and numerical study of the transverse Kelvin-Helmholtz instability in tokamak edge plasmas
Authors:
Myra, J. R.; D'Ippolito, D. A.; Russell, D. A.; Umansky, M. V.; Baver, D. A.
Affiliation:
AA(1 Lodestar Research Corporation, Boulder, CO, USA), AB(1 Lodestar Research Corporation, Boulder, CO, USA), AC(1 Lodestar Research Corporation, Boulder, CO, USA), AD(2 Lawrence Livermore National Laboratory, Livermore, CA, USA), AE(1 Lodestar Research Corporation, Boulder, CO, USA)
Publication:
Journal of Plasma Physics, Volume 82, Issue 2, article id. 905820210, 21 pp.
Publication Date:
04/2016
Origin:
CUP
Abstract Copyright:
(c) 2016: © Cambridge University Press 2016
DOI:
10.1017/S0022377816000301
Bibliographic Code:
2016JPlPh..82b9010M

Abstract

> Sheared flows perpendicular to the magnetic field can be driven by the Reynolds stress or ion pressure gradient effects and can potentially influence the stability and turbulent saturation level of edge plasma modes. On the other hand, such flows are subject to the transverse Kelvin-Helmholtz (KH) instability. Here, the linear theory of KH instabilities is first addressed with an analytic model in the asymptotic limit of long wavelengths compared with the flow scale length. The analytic model treats sheared flows, ion diamagnetism (including gyro-viscous terms), density gradients and parallel currents in a slab geometry, enabling a unified summary that encompasses and extends previous results. In particular, while ion diamagnetism, density gradients and parallel currents each individually reduce KH growth rates, the combined effect of density and ion pressure gradients is more complicated and partially counteracting. Secondly, the important role of realistic toroidal geometry is explored numerically using an invariant scaling analysis together with the 2DX eigenvalue code to examine KH modes in both closed and open field line regions. For a typical spherical torus magnetic geometry, it is found that KH modes are more unstable at, and just outside of, the separatrix as a result of the distribution of magnetic shear. Finally implications for reduced edge turbulence modelling codes are discussed.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints