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Träfflista för sökning "WFRF:(Lisak Mietek 1947 ) ;pers:(Lisak Mietek 1947);mspu:(article);pers:(Sharapov S. E.)"

Sökning: WFRF:(Lisak Mietek 1947 ) > Lisak Mietek 1947 > Tidskriftsartikel > Sharapov S. E.

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  • Sandquist, Patrik, 1979-, et al. (författare)
  • Bidirectional tornado modes on the Joint European Torus
  • 2007
  • Ingår i: PHYSICS OF PLASMAS. ; 14:12
  • Tidskriftsartikel (refereegranskat)abstract
    • In discharges on the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)] with safety factor q(0)< 1 and high-power ion cyclotron resonance heating (ICRH), monster sawtooth crashes are preceded by frequency sweeping tornado modes in the toroidal Alfven eigenmode frequency range. A suite of equilibrium and spectral magnetohydrodynamical codes is used for explaining the observed evolution of the tornado mode frequency and for identifying temporal evolution of the safety factor inside the q=1 radius just before sawtooth crashes. In some cases, the tornado modes are observed simultaneously with both positive and negative toroidal mode numbers. Hence, a free energy source other than the radial gradient of the energetic ion pressure exciting these modes is sought. The distribution function of the ICRH-accelerated ions is assessed with the SELFO code [J. Hedin , Nucl. Fusion 42, 527 (2002)] and energetic particle drive due to the velocity space anisotropy of ICRH-accelerated ions is considered analytically as the possible source for excitation of bidirectional tornado modes.
  • Sharapov, S.E., et al. (författare)
  • Energetic particle instabilities in fusion plasmas
  • 2013
  • Ingår i: Nuclear Fusion. - 0029-5515. ; 53:10
  • Tidskriftsartikel (refereegranskat)abstract
    • Remarkable progress has been made in diagnosing energetic particle instabilities on present-day machines and in establishing a theoretical framework for describing them. This overview describes the much improved diagnostics of Alfvén instabilities and modelling tools developed world-wide, and discusses progress in interpreting the observed phenomena. A multi-machine comparison is presented giving information on the performance of both diagnostics and modelling tools for different plasma conditions outlining expectations for ITER based on our present knowledge.
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