Destabilization of TAE modes by particle anisotropy

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Description

Plasmas heated by ICRF produce energetic particle distribution functions which are sharply peaked in pitch-angle, and the authors show that at moderate toroidal mode numbers, this anisotropy is a competitive and even dominant instability drive when compared with the universal instability drive due to spatial gradient. The universal drive, acting along, destabilizes only co-propagating waves (i.e., waves propagating in the same toroidal direction as the diamagnetic flow of the energetic particles), but stabilizes counter-propagating waves (i.e., waves propagating in the opposite toroidal direction as the diamagnetic flow of the energetic particles). Nonetheless, the authors show that in a tokamak, it ... continued below

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14 p.

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Wong, H.V. & Berk, H.L. October 20, 1998.

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Description

Plasmas heated by ICRF produce energetic particle distribution functions which are sharply peaked in pitch-angle, and the authors show that at moderate toroidal mode numbers, this anisotropy is a competitive and even dominant instability drive when compared with the universal instability drive due to spatial gradient. The universal drive, acting along, destabilizes only co-propagating waves (i.e., waves propagating in the same toroidal direction as the diamagnetic flow of the energetic particles), but stabilizes counter-propagating waves (i.e., waves propagating in the opposite toroidal direction as the diamagnetic flow of the energetic particles). Nonetheless, the authors show that in a tokamak, it is possible that particle anisotropy can produce a larger linear growth rate for counter-propagating waves, and provide a mechanism for preferred destabilization of the counter-propagating TAE modes that are sometimes experimentally observed.

Physical Description

14 p.

Notes

INIS; OSTI as DE99000351

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  • Other Information: PBD: 20 Oct 1998

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  • Other: DE99000351
  • Report No.: DOE/ER/54346--846
  • Grant Number: FG03-96ER54346
  • DOI: 10.2172/674818 | External Link
  • Office of Scientific & Technical Information Report Number: 674818
  • Archival Resource Key: ark:/67531/metadc703332

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  • October 20, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 4, 2015, 4:16 p.m.

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Wong, H.V. & Berk, H.L. Destabilization of TAE modes by particle anisotropy, report, October 20, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc703332/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.