Stabilization of ballooning modes with sheared toroidal rotation

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A new code demonstrates the stabilization of MHD ballooning modes by sheared toroidal rotation. A shifted-circle model is used to elucidate the physics and numerically reconstructed equilibria are used to analyze DIII-D discharges. In the ballooning representation, the modes shift periodically along the field line to the next point of unfavorable curvature. The shift frequency (d{Omega}/dq where {Omega} is the angular toroidal velocity and q is the safety factor) is proportional to the rotation shear and inversely proportional to the magnetic shear. Stability improves with increasing shift frequency and, in the shifted circle model, direct stable access to the second ... continued below

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7 p.

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Miller, R.L.; Waelbroeck, F.W.; Lao, L.L. & Taylor, T.S. November 1, 1994.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

A new code demonstrates the stabilization of MHD ballooning modes by sheared toroidal rotation. A shifted-circle model is used to elucidate the physics and numerically reconstructed equilibria are used to analyze DIII-D discharges. In the ballooning representation, the modes shift periodically along the field line to the next point of unfavorable curvature. The shift frequency (d{Omega}/dq where {Omega} is the angular toroidal velocity and q is the safety factor) is proportional to the rotation shear and inversely proportional to the magnetic shear. Stability improves with increasing shift frequency and, in the shifted circle model, direct stable access to the second stability regime occurs when this frequency is a fraction of the Alfven frequency {omega}{sub A} = V{sub A}/qR. Shear stabilization is also demonstrated for an equilibrium reconstruction of a DIII-D VH-mode.

Physical Description

7 p.

Notes

INIS; OSTI as DE95008388

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  • 15. international conference on plasma physics and controlled nuclear fusion research, Madrid (Spain), 26 Sep - 1 Oct 1994

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  • Other: DE95008388
  • Report No.: GA-A--21793
  • Report No.: CONF-940933--36
  • Grant Number: FG03-92ER54150
  • Office of Scientific & Technical Information Report Number: 42829
  • Archival Resource Key: ark:/67531/metadc677473

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 1, 1994

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 18, 2016, 5:49 p.m.

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Miller, R.L.; Waelbroeck, F.W.; Lao, L.L. & Taylor, T.S. Stabilization of ballooning modes with sheared toroidal rotation, article, November 1, 1994; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc677473/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.