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.
Ward, D J;
Hofmann, F
[1]
- Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
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}
}
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}
}