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Active feedback stabilization of axisymmetric modes in highly elongated tokamak plasmas

Technical Report:

Abstract

Active feedback stabilization of the vertical instability is studied for highly elongated tokamak plasmas (1{<=}{kappa}{<=}3), and evaluated in particular for the TCV configuration. It is shown that the feedback can strongly affect the form of the eigenfunction for these highly elongated equilibria, and this can have detrimental effects on the ability of the feedback system to properly detect and stabilize the plasma. A calculation of the vertical displacement that uses poloidal flux measurements, poloidal magnetic field measurements, and corrections for the vessel eddy currents and active feedback currents was found to be effective even in the cases with the worst deformations of the eigenfunction. We also examine how these deformations affect differently shaped equilibria, and it is seen that the magnitude of the deformation of the eigenfunction is strongly function of the plasma elongation. (author) 15 figs., 13 refs.
Authors:
Ward, D J; Hofmann, F [1] 
  1. Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Publication Date:
Jul 01, 1993
Product Type:
Technical Report
Report Number:
LRP-480/93
Reference Number:
SCA: 700340; PA: AIX-25:007872; EDB-94:016648; ERA-19:007830; NTS-94:015333; SN: 94001127214
Resource Relation:
Other Information: PBD: Jul 1993
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; FEEDBACK; STABILITY; AXIAL SYMMETRY; BETA RATIO; CONTAINERS; DEFORMATION; EDDY CURRENTS; EIGENFUNCTIONS; ELECTRIC CONDUCTORS; ELONGATION; EQUILIBRIUM PLASMA; MAGNETIC FIELDS; PLASMA INSTABILITY; THEORETICAL DATA; 700340; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES
OSTI ID:
10113883
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: DE94611468; TRN: CH9300597007872
Availability:
OSTI; NTIS; INIS
Submitting Site:
CHN
Size:
36 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ward, D J, and Hofmann, F. Active feedback stabilization of axisymmetric modes in highly elongated tokamak plasmas. Switzerland: N. p., 1993. Web.
Ward, D J, & Hofmann, F. Active feedback stabilization of axisymmetric modes in highly elongated tokamak plasmas. Switzerland.
Ward, D J, and Hofmann, F. 1993. "Active feedback stabilization of axisymmetric modes in highly elongated tokamak plasmas." Switzerland.
@misc{etde_10113883,
title = {Active feedback stabilization of axisymmetric modes in highly elongated tokamak plasmas}
author = {Ward, D J, and Hofmann, F}
abstractNote = {Active feedback stabilization of the vertical instability is studied for highly elongated tokamak plasmas (1{<=}{kappa}{<=}3), and evaluated in particular for the TCV configuration. It is shown that the feedback can strongly affect the form of the eigenfunction for these highly elongated equilibria, and this can have detrimental effects on the ability of the feedback system to properly detect and stabilize the plasma. A calculation of the vertical displacement that uses poloidal flux measurements, poloidal magnetic field measurements, and corrections for the vessel eddy currents and active feedback currents was found to be effective even in the cases with the worst deformations of the eigenfunction. We also examine how these deformations affect differently shaped equilibria, and it is seen that the magnitude of the deformation of the eigenfunction is strongly function of the plasma elongation. (author) 15 figs., 13 refs.}
place = {Switzerland}
year = {1993}
month = {Jul}
}