Magnetohydodynamics stability of compact stellarators

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Recent stability results of external kink modes and vertical modes in compact stellarators are presented. The vertical mode is found to be stabilized by externally generated poloidal flux. A simple stability criterion is derived in the limit of large aspect ratio and constant current density. For a wall at infinite distance from the plasma, the amount of external flux needed for stabilization is given by Fi = (k2 {minus} k)=(k2 + 1), where k is the axisymmetric elongation and Fi is the fraction of the external rotational transform. A systematic parameter study shows that the external kink mode in QAS ... continued below

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924 Kilobytes pages

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Fu, G.Y.; Ku, L.P.; Cooper, W.A. & Hirshman, S.H. January 3, 2000.

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Description

Recent stability results of external kink modes and vertical modes in compact stellarators are presented. The vertical mode is found to be stabilized by externally generated poloidal flux. A simple stability criterion is derived in the limit of large aspect ratio and constant current density. For a wall at infinite distance from the plasma, the amount of external flux needed for stabilization is given by Fi = (k2 {minus} k)=(k2 + 1), where k is the axisymmetric elongation and Fi is the fraction of the external rotational transform. A systematic parameter study shows that the external kink mode in QAS can be stabilized at high beta ({approximately} 5%) without a conducting wall by magnetic shear via 3D shaping. It is found that external kinks are driven by both parallel current and pressure gradient. The pressure contributes significantly to the overall drive through the curvature term and the Pfirsch-Schluter current.

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924 Kilobytes pages

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INIS; OSTI as DE00750055

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  • Other Information: PBD: 3 Jan 2000

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  • Report No.: PPPL--3412
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/750055 | External Link
  • Office of Scientific & Technical Information Report Number: 750055
  • Archival Resource Key: ark:/67531/metadc710594

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  • January 3, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 15, 2016, 7:35 p.m.

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Fu, G.Y.; Ku, L.P.; Cooper, W.A. & Hirshman, S.H. Magnetohydodynamics stability of compact stellarators, report, January 3, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc710594/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.