Beam Anisotropy Effect on Alfven Eigenmode Stability in ITER-like Plasma

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This work studies the stability of the toroidicity-induced Alfven Eigenmodes (TAE) in the proposed ITER burning plasma experiment, which can be driven unstable by two groups of energetic particles, the 3.5-MeV {alpha}-particle fusion products and the tangentially injected 1-MeV beam ions. Both species are super-Alfvenic but they have different pitch-angle distributions and the drive for the same pressure gradients is typically stronger from co-injected beam ions as compared with the isotropically distributed {alpha}-particles. This study includes the effect of anisotropy of the beam-ion distribution function on TAE growth rate directly via the additional velocity space drive and indirectly in terms ... continued below

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856 pages

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Gorelenkov, N.N.; Berk, H.L. & Budny, R.V. August 18, 2004.

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Description

This work studies the stability of the toroidicity-induced Alfven Eigenmodes (TAE) in the proposed ITER burning plasma experiment, which can be driven unstable by two groups of energetic particles, the 3.5-MeV {alpha}-particle fusion products and the tangentially injected 1-MeV beam ions. Both species are super-Alfvenic but they have different pitch-angle distributions and the drive for the same pressure gradients is typically stronger from co-injected beam ions as compared with the isotropically distributed {alpha}-particles. This study includes the effect of anisotropy of the beam-ion distribution function on TAE growth rate directly via the additional velocity space drive and indirectly in terms of the enhanced effect of the resonant particle phase space density. For near parallel injection, TAEs are marginally unstable if the injection aims at the plasma center where the ion Landau damping is strong, whereas with the off-axis neutral-beam injection the instability is stronger with the growth rate near 0.5% of TAE mode frequency. In contrast, for perpendicular beam injection TAEs are predicted to be stabilized in nominal ITER discharges. In addition, the effect of TAEs on the fast-ion beta profiles is evaluated on the bases of a quasi-linear diffusion model which makes use of analytic expressions for the local growth and damping rates. These results illustrate the parameter window that is available for plasma burn when TAE modes are excited.

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856 pages

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INIS; OSTI as DE00834526

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  • Other Information: PBD: 18 Aug 2004

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  • Report No.: pppl-3998
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/834526 | External Link
  • Office of Scientific & Technical Information Report Number: 834526
  • Archival Resource Key: ark:/67531/metadc783212

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

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  • August 18, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • June 10, 2016, 5:52 p.m.

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Gorelenkov, N.N.; Berk, H.L. & Budny, R.V. Beam Anisotropy Effect on Alfven Eigenmode Stability in ITER-like Plasma, report, August 18, 2004; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc783212/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.