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The effects of plasma deformability on the feedback stabilization of axisymmetric modes in tokamak plasmas

Technical Report:

Abstract

The effects of plasma deformability on the feedback stabilization of axisymmetric modes of tokamak plasmas are studied. It is seen that plasmas with strongly shaped cross sections have unstable motion different from a rigid shift. Furthermore, the placement of passive conductors is shown to modify the non-rigid components of the eigenfunction in a way that reduces the stabilizing eddy currents in these conductors. Passive feedback results using several equilibria of varying shape are presented. The eigenfunction is also modified under the effects of active feedback. This deformation is seen to depend strongly on the position of the flux loops which are used to determine plasma vertical position for the active feedback system. The variations of these non-rigid components of the eigenfunction always serve to reduce the stabilizing effect of the active feedback system by reducing the measurable poloidal flux at the flux-loop locations. Active feedback results are presented for the PBX-M tokamak configuration. (author) 19 figs., 2 tabs., 30 refs.
Authors:
Ward, D J; [1]  Jardin, S C [2] 
  1. Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
  2. Princeton Univ., NJ (United States). Plasma Physics Lab.
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
LRP-434/91
Reference Number:
SCA: 700340; PA: AIX-23:013663; SN: 92000639333
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA; DEFORMATION; PLASMA INSTABILITY; FEEDBACK; TOKAMAK DEVICES; ASPECT RATIO; AXIAL SYMMETRY; BETA RATIO; BOUNDARY CONDITIONS; COMPUTERIZED SIMULATION; CONFINEMENT TIME; EDDY CURRENTS; EIGENFUNCTIONS; ELECTRIC CURRENTS; ELLIPTICAL CONFIGURATION; EQUILIBRIUM PLASMA; MAGNETOHYDRODYNAMICS; N CODES; PARTIAL DIFFERENTIAL EQUATIONS; PBX DEVICES; T CODES; THEORETICAL DATA; 700340; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES
OSTI ID:
10111737
Research Organizations:
Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE92614471; TRN: CH9100592013663
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
CHN
Size:
54 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ward, D J, and Jardin, S C. The effects of plasma deformability on the feedback stabilization of axisymmetric modes in tokamak plasmas. Switzerland: N. p., 1991. Web.
Ward, D J, & Jardin, S C. The effects of plasma deformability on the feedback stabilization of axisymmetric modes in tokamak plasmas. Switzerland.
Ward, D J, and Jardin, S C. 1991. "The effects of plasma deformability on the feedback stabilization of axisymmetric modes in tokamak plasmas." Switzerland.
@misc{etde_10111737,
title = {The effects of plasma deformability on the feedback stabilization of axisymmetric modes in tokamak plasmas}
author = {Ward, D J, and Jardin, S C}
abstractNote = {The effects of plasma deformability on the feedback stabilization of axisymmetric modes of tokamak plasmas are studied. It is seen that plasmas with strongly shaped cross sections have unstable motion different from a rigid shift. Furthermore, the placement of passive conductors is shown to modify the non-rigid components of the eigenfunction in a way that reduces the stabilizing eddy currents in these conductors. Passive feedback results using several equilibria of varying shape are presented. The eigenfunction is also modified under the effects of active feedback. This deformation is seen to depend strongly on the position of the flux loops which are used to determine plasma vertical position for the active feedback system. The variations of these non-rigid components of the eigenfunction always serve to reduce the stabilizing effect of the active feedback system by reducing the measurable poloidal flux at the flux-loop locations. Active feedback results are presented for the PBX-M tokamak configuration. (author) 19 figs., 2 tabs., 30 refs.}
place = {Switzerland}
year = {1991}
month = {Sep}
}