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Author : N. Pomphrey
Release : 1987
Genre :
Kind : eBook
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Book Synopsis Feedback Stabilization of the Axisymmetric Instability of a Deformable Tokamak Plasma by : N. Pomphrey
Download or read book Feedback Stabilization of the Axisymmetric Instability of a Deformable Tokamak Plasma written by N. Pomphrey. This book was released on 1987. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Release : 1987
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Feedback Stabilization of the Axisymmetric Instability of a Deformable Tokamak Plasma by :
Download or read book Feedback Stabilization of the Axisymmetric Instability of a Deformable Tokamak Plasma written by . This book was released on 1987. Available in PDF, EPUB and Kindle. Book excerpt: We analyze the magnetohydrodynamic (MHD) stability of the axisymmetric system consisting of a free boundary, non-circular cross-section tokamak plasma, finite resistivity passive conductors, and an active feedback system with magnetic flux pickup loops, a proportional amplifier with gain G, and current carrying poloidal field coils. Numerical simulation of a system that is unstable with G = 0 shows that for some placements of the pickup loops, the system will remain unstable for all values of G, while for other placements of the loops, the system will be stable for G> G/sub crit/. This behavior is explained by analysis using an extended energy principle, and it is shown to result from the deformability of the plasma cross section. 9 refs., 5 figs.
Author :
Release : 1992
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Book Synopsis The Effects of Plasma Deformability on the Feedback Stabilization of Axisymmetric Modes in Tokamak Plasmas by :
Download or read book The Effects of Plasma Deformability on the Feedback Stabilization of Axisymmetric Modes in Tokamak Plasmas written by . This book was released on 1992. Available in PDF, EPUB and Kindle. Book excerpt: 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 : David John Ward
Release : 1991
Genre :
Kind : eBook
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Book Synopsis Studies of Feedback Stabilization of Axisymmetric Modes in Deformable Tokamak Plasmas by : David John Ward
Download or read book Studies of Feedback Stabilization of Axisymmetric Modes in Deformable Tokamak Plasmas written by David John Ward. This book was released on 1991. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Release : 1992
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis The Effects of Plasma Deformability on the Feedback Stabilization of Axisymmetric Modes in Tokamak Plasmas by :
Download or read book The Effects of Plasma Deformability on the Feedback Stabilization of Axisymmetric Modes in Tokamak Plasmas written by . This book was released on 1992. Available in PDF, EPUB and Kindle. Book excerpt: 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.
