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

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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 ... continued below

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Pages: (55 p)

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Ward, D.J. (Centre de Recherches en Physique des Plasmas, Lausanne (Switzerland)) & Jardin, S.C. (Princeton Univ., NJ (United States). Plasma Physics Lab.) January 1, 1992.

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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.

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Pages: (55 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Other: DE92006812
  • Report No.: PPPL-2805
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/5956297 | External Link
  • Office of Scientific & Technical Information Report Number: 5956297
  • Archival Resource Key: ark:/67531/metadc1100794

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  • January 1, 1992

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 11, 2018, 5:38 p.m.

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Ward, D.J. (Centre de Recherches en Physique des Plasmas, Lausanne (Switzerland)) & Jardin, S.C. (Princeton Univ., NJ (United States). Plasma Physics Lab.). The effects of plasma deformability on the feedback stabilization of axisymmetric modes in tokamak plasmas, report, January 1, 1992; New Jersey. (digital.library.unt.edu/ark:/67531/metadc1100794/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.