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Effect of sheared flows on neoclassical tearing modes

Abstract

The influence of toroidal sheared equilibrium flows on the nonlinear evolution of classical and neoclassical tearing modes (NTMs) is studied through numerical solutions of a set of reduced generalized MHD equations that include viscous force effects based on neoclassical closures. In general, differential flow is found to have a strong stabilizing influence leading to lower saturated island widths for the classical (m/n = 2/1) mode and reduced growth rates for the (m/n = 3/1) neoclassical mode. Velocity shear on the other hand is seen to make a destabilizing contribution. An analytic model calculation, consisting of a generalized Rutherford island evolution equation that includes shear flow effects is also presented and the numerical results are discussed in the context of this model. (author)
Authors:
Sen, A; [1]  Chandra, D; Kaw, P; [1]  Bora, M P; [2]  Kruger, S; [3]  Ramos, J [4] 
  1. Institute for Plasma Research, Bhat, Gandhinagar (India)
  2. Physics Dept., Gauhati University, Guwahati (India)
  3. Tech-X, Boulder, CO (United States)
  4. Plasma Science and Fusion Center, MIT, Cambridge, MA (United States)
Publication Date:
Jan 01, 2005
Product Type:
Conference
Report Number:
IAEA-CSP-25/CD; TH/6-1
Resource Relation:
Conference: 20. IAEA fusion energy conference 2004, Villamoura (Portugal), 1-6 Nov 2004; Other Information: 16 refs, 5 figs; Related Information: In: 20th IAEA fusion energy conference 2004. Conference proceedings, C and S papers seriesno. 25/CD, 3451 pages.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EQUILIBRIUM; MAGNETIC ISLANDS; MAGNETOHYDRODYNAMICS; NEOCLASSICAL TRANSPORT THEORY; NONLINEAR PROBLEMS; NUMERICAL SOLUTION; PLASMA FLUID EQUATIONS; SHEAR; TEARING INSTABILITY
OSTI ID:
20650737
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); Instituto Superior Tecnico, Centro de Fusao Nuclear, Lisbon (Portugal)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISBN 92-0-100405-2; ISSN 1562-4153; TRN: XA0501916090354
Availability:
Available from INIS in electronic form; Also available online: http://www-pub.iaea.org/MTCD/publications/PDF/CSP-25-CD_front.pdf and on 1 CD-ROM from IAEA, Sales and Promotion Unit: E-mail: sales.publications@iaea.org; Web site: http://www-pub.iaea.org/MTCD/publications/publications.asp
Submitting Site:
INIS
Size:
8 pages
Announcement Date:
Nov 23, 2005

Citation Formats

Sen, A, Chandra, D, Kaw, P, Bora, M P, Kruger, S, and Ramos, J. Effect of sheared flows on neoclassical tearing modes. IAEA: N. p., 2005. Web.
Sen, A, Chandra, D, Kaw, P, Bora, M P, Kruger, S, & Ramos, J. Effect of sheared flows on neoclassical tearing modes. IAEA.
Sen, A, Chandra, D, Kaw, P, Bora, M P, Kruger, S, and Ramos, J. 2005. "Effect of sheared flows on neoclassical tearing modes." IAEA.
@misc{etde_20650737,
title = {Effect of sheared flows on neoclassical tearing modes}
author = {Sen, A, Chandra, D, Kaw, P, Bora, M P, Kruger, S, and Ramos, J}
abstractNote = {The influence of toroidal sheared equilibrium flows on the nonlinear evolution of classical and neoclassical tearing modes (NTMs) is studied through numerical solutions of a set of reduced generalized MHD equations that include viscous force effects based on neoclassical closures. In general, differential flow is found to have a strong stabilizing influence leading to lower saturated island widths for the classical (m/n = 2/1) mode and reduced growth rates for the (m/n = 3/1) neoclassical mode. Velocity shear on the other hand is seen to make a destabilizing contribution. An analytic model calculation, consisting of a generalized Rutherford island evolution equation that includes shear flow effects is also presented and the numerical results are discussed in the context of this model. (author)}
place = {IAEA}
year = {2005}
month = {Jan}
}