Transport dynamics and multi-scale coupling of turbulence in LHD

the LHD Experimental Group

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Spatiotemporal correlation of heat transport and micro- to meso- scale or macro-scale coupling of plasma turbulence are investigated in LHD plasmas, where fast propagation of a cold pulse and a non-local temperature rise are observed. Evidence of a timescale shorter than the diffusion time and a spatial scale longer than the micro-turbulence correlation length between core heat fluxes and edge temperature gradients is found. At the same time, an envelope of turbulent density fluctuations is also found to be modulated. Observation of low frequency (≤ 2 kHz) amplitude modulation of density fluctuation suggests the existence of meso- to macro-scale turbulent structures in the plasma, in which a non-local temperature rise takes place. Relationships between the turbulence with long radial correlation length and the edge-core coupling of heat transport are discussed.

Original languageEnglish
Article numberS1006
JournalPlasma and Fusion Research
Volume3
DOIs
Publication statusPublished - Jan 1 2008

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turbulence
heat
plasma turbulence
heat flux
temperature gradients
envelopes
low frequencies
temperature
propagation
pulses

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Transport dynamics and multi-scale coupling of turbulence in LHD. / the LHD Experimental Group.

In: Plasma and Fusion Research, Vol. 3, S1006, 01.01.2008.

Research output: Contribution to journalArticle

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abstract = "Spatiotemporal correlation of heat transport and micro- to meso- scale or macro-scale coupling of plasma turbulence are investigated in LHD plasmas, where fast propagation of a cold pulse and a non-local temperature rise are observed. Evidence of a timescale shorter than the diffusion time and a spatial scale longer than the micro-turbulence correlation length between core heat fluxes and edge temperature gradients is found. At the same time, an envelope of turbulent density fluctuations is also found to be modulated. Observation of low frequency (≤ 2 kHz) amplitude modulation of density fluctuation suggests the existence of meso- to macro-scale turbulent structures in the plasma, in which a non-local temperature rise takes place. Relationships between the turbulence with long radial correlation length and the edge-core coupling of heat transport are discussed.",
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AU - Inagaki, Shigeru

AU - Tamura, Naoki

AU - Shigeru, Inagaki

AU - Tokuzawa, Tokihiko

AU - Nagashima, Yoshihiko

AU - Ida, Katsumi

AU - Yamada, Takuma

AU - Kubo, Shin

AU - Terasaka, Kenichi

AU - Shimozuma, Takashi

AU - Terasaka, Kenichiro

AU - Kawahata, Kazuo

AU - Komori, Akio

AU - Shinohara, Shunjiro

AU - Fujisawa, Akihide

AU - Yagi, Masatoshi

AU - fujisawa, akihide

AU - Itoh, Sanae I.

AU - Itoh, Sanae

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AB - Spatiotemporal correlation of heat transport and micro- to meso- scale or macro-scale coupling of plasma turbulence are investigated in LHD plasmas, where fast propagation of a cold pulse and a non-local temperature rise are observed. Evidence of a timescale shorter than the diffusion time and a spatial scale longer than the micro-turbulence correlation length between core heat fluxes and edge temperature gradients is found. At the same time, an envelope of turbulent density fluctuations is also found to be modulated. Observation of low frequency (≤ 2 kHz) amplitude modulation of density fluctuation suggests the existence of meso- to macro-scale turbulent structures in the plasma, in which a non-local temperature rise takes place. Relationships between the turbulence with long radial correlation length and the edge-core coupling of heat transport are discussed.

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