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Observation of a critical gradient threshold for electron temperature fluctuations in the DIII-D Tokamak.
Hillesheim, J C; DeBoo, J C; Peebles, W A; Carter, T A; Wang, G; Rhodes, T L; Schmitz, L; McKee, G R; Yan, Z; Staebler, G M; Burrell, K H; Doyle, E J; Holland, C; Petty, C C; Smith, S P; White, A E; Zeng, L.
Afiliação
  • Hillesheim JC; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
  • DeBoo JC; General Atomics, San Diego, California 92186-5608, USA.
  • Peebles WA; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
  • Carter TA; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
  • Wang G; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
  • Rhodes TL; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
  • Schmitz L; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
  • McKee GR; University of Wisconsin Madison, Madison, Wisconsin 53706-1687, USA.
  • Yan Z; University of Wisconsin Madison, Madison, Wisconsin 53706-1687, USA.
  • Staebler GM; General Atomics, San Diego, California 92186-5608, USA.
  • Burrell KH; General Atomics, San Diego, California 92186-5608, USA.
  • Doyle EJ; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
  • Holland C; University of California at San Diego, La Jolla, California 92093-0417, USA.
  • Petty CC; General Atomics, San Diego, California 92186-5608, USA.
  • Smith SP; General Atomics, San Diego, California 92186-5608, USA.
  • White AE; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • Zeng L; Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA.
Phys Rev Lett ; 110(4): 045003, 2013 Jan 25.
Article em En | MEDLINE | ID: mdl-25166172
ABSTRACT
A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core of a confined high-temperature plasma. In an experiment in the DIII-D tokamak where L(T(e))(-1) = |∇T(e)|/T(e) and toroidal rotation were varied, long wavelength (k(θ)ρ(s) ≲ 0.4) electron temperature fluctuations exhibit a threshold in L(T(e))(-1) below, they change little; above, they steadily increase. The increase in δT(e)/T(e) is concurrent with increased electron heat flux and transport stiffness. Observations were insensitive to rotation. Accumulated evidence strongly enforces the identification of the experimentally observed threshold with ∇T(e)-driven trapped electron mode turbulence.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Estados Unidos
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Estados Unidos