Compressional Alfvin Eigenmode Dispersion in Low Aspect Ratio Plasmas

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Description

Recent observations of new fast ion beam driven instabilities in MHz frequency range in National Spherical Torus experiments (NSTX) are suggested to be Compressional Alfvin Eigenmodes (CAEs). A new theory of CAEs applicable to low aspect ratio toroidal plasmas is developed based on the ballooning representation for the poloidal dependence of the perturbed quantities. In agreement with observations, the analytical theory predicts that CAEs are discrete modes with frequencies correlated with the characteristic Alfvin velocity of the plasma. Plasma equilibrium structure is essential to determine accurately the dispersion of CAEs. The mode structure is localized in both the minor radius ... continued below

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469 KILOBYTES pages

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Gorelenkov, N.N.; Cheng, C.Z. & Fredrickson, E. January 29, 2002.

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Description

Recent observations of new fast ion beam driven instabilities in MHz frequency range in National Spherical Torus experiments (NSTX) are suggested to be Compressional Alfvin Eigenmodes (CAEs). A new theory of CAEs applicable to low aspect ratio toroidal plasmas is developed based on the ballooning representation for the poloidal dependence of the perturbed quantities. In agreement with observations, the analytical theory predicts that CAEs are discrete modes with frequencies correlated with the characteristic Alfvin velocity of the plasma. Plasma equilibrium structure is essential to determine accurately the dispersion of CAEs. The mode structure is localized in both the minor radius and the poloidal directions on the low magnetic field side.

Physical Description

469 KILOBYTES pages

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INIS; OSTI as DE00795724

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  • Other Information: Supercedes report DE00795724; PBD: 29 Jan 2002

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  • Report No.: PPPL-3663.pdf
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/795724 | External Link
  • Office of Scientific & Technical Information Report Number: 795724
  • Archival Resource Key: ark:/67531/metadc741963

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  • January 29, 2002

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • April 15, 2016, 8:34 p.m.

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Gorelenkov, N.N.; Cheng, C.Z. & Fredrickson, E. Compressional Alfvin Eigenmode Dispersion in Low Aspect Ratio Plasmas, report, January 29, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc741963/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.