Destabilization of Fast Magnetoacoustic Waves by Circulating Energetic Ions in Toroidal Plasmas

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Description

An instability of fast magnetoacoustic waves (FMW) driven by circulating energetic ions in axisymmetric toroidal plasmas and characterized by the frequencies below the ion gyrofrequency is considered. An important role of the l=0 resonance (l is the number of a cyclotron harmonic) in the wave-particle interaction is revealed: It is shown that this resonance considerably extends an unstable region in the space of the pitch-angles of the energetic ions and the wave frequencies. The analysis is carried out for a ''slow'' instability, which has the growth rate less than the bounce frequency of the energetic ions. Specific examples relevant to ... continued below

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840 Kilobytes pages

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Belikov, V.S.; Kolesnichenko, Ya. I. & White, R. B. August 21, 2003.

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Description

An instability of fast magnetoacoustic waves (FMW) driven by circulating energetic ions in axisymmetric toroidal plasmas and characterized by the frequencies below the ion gyrofrequency is considered. An important role of the l=0 resonance (l is the number of a cyclotron harmonic) in the wave-particle interaction is revealed: It is shown that this resonance considerably extends an unstable region in the space of the pitch-angles of the energetic ions and the wave frequencies. The analysis is carried out for a ''slow'' instability, which has the growth rate less than the bounce frequency of the energetic ions. Specific examples relevant to the National Spherical Torus Experiment (NSTX) [J. Spitzer et al., Fusion Technol. 30 (1996) 1337], where instabilities of this kind were observed, are considered.

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840 Kilobytes pages

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INIS; OSTI as DE00814743

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  • Other Information: PBD: 21 Aug 2003

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  • Report No.: PPPL-3855
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/814743 | External Link
  • Office of Scientific & Technical Information Report Number: 814743
  • Archival Resource Key: ark:/67531/metadc740020

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  • August 21, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 8:36 p.m.

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Belikov, V.S.; Kolesnichenko, Ya. I. & White, R. B. Destabilization of Fast Magnetoacoustic Waves by Circulating Energetic Ions in Toroidal Plasmas, report, August 21, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc740020/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.