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Regulation of Alfvén Eigenmodes by Microturbulence in Fusion Plasmas.
Liu, P; Wei, X; Lin, Z; Brochard, G; Choi, G J; Heidbrink, W W; Nicolau, J H; McKee, G R.
Afiliación
  • Liu P; Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
  • Wei X; Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
  • Lin Z; Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
  • Brochard G; Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
  • Choi GJ; Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
  • Heidbrink WW; Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
  • Nicolau JH; Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
  • McKee GR; College of Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA.
Phys Rev Lett ; 128(18): 185001, 2022 May 06.
Article en En | MEDLINE | ID: mdl-35594094
Global gyrokinetic simulations of mesoscale reversed shear Alfven eigenmodes (RSAE) excited by energetic particles (EP) in fusion plasmas find that RSAE amplitude and EP transport are much higher than experimental levels at nonlinear saturation, but quickly diminish to very low levels after the saturation if background microturbulence is artificially suppressed. In contrast, in simulations coupling micro-meso scales, the RSAE amplitude and EP transport decrease drastically at the initial saturation but later increases to the experimental levels in the quasisteady state with bursty dynamics due to regulation by thermal ion temperature gradient (ITG) microturbulence. The quasisteady state EP transport is larger for a stronger microturbulence. The RSAE amplitude in the quasisteady state ITG-RSAE turbulence from gyrokinetic simulations, for the first time, agrees very well with experimental measurements.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos