Dynamic transport study of electron thermal energy in nonlinear fusion plasma

the LHD Experimental Group

Research output: Contribution to journalArticle

Abstract

In nuclear fusion plasmas, both thermal energy and particle transports governed by plasma turbulence are anomalously enhanced above neoclassical levels. Plasma turbulence induces various complex phenomena in transport processes, such as nonlinearity and nonlocality. Therefore, it is very important to clarify the relationship between plasma turbulence and anomalous transports. We have approached these complicated problems by analyzing the dynamics, which are recognized as temporal trajectories in a flux-gradient space, rather than using conventional power balance. In particular, in fusion research, it is critical to elucidate the mechanism of electron thermal energy transport, because the incoming burning plasmas are sustained by the heating of alpha particles. In Large Helical Device (LHD), the dynamic relationships between electron thermal fluxes and electron temperature gradients are investigated using modulated electron cyclotron heating and modern electron cyclotron emission diagnostic systems. Some trajectories, such as a hysteresis loop and a line segment with a steep slope, are observed in high-temperature LHD plasmas. Strong nonlinear properties in the transport are revealed by studying the dynamics.

Original languageEnglish
Article numberS1029
JournalPlasma and Fusion Research
Volume3
DOIs
Publication statusPublished - Jan 1 2008

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plasma turbulence
thermal energy
fusion
trajectories
electron cyclotron heating
electrons
nuclear fusion
alpha particles
cyclotrons
temperature gradients
hysteresis
nonlinearity
electron energy
slopes
gradients
heating
temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Dynamic transport study of electron thermal energy in nonlinear fusion plasma. / the LHD Experimental Group.

In: Plasma and Fusion Research, Vol. 3, S1029, 01.01.2008.

Research output: Contribution to journalArticle

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abstract = "In nuclear fusion plasmas, both thermal energy and particle transports governed by plasma turbulence are anomalously enhanced above neoclassical levels. Plasma turbulence induces various complex phenomena in transport processes, such as nonlinearity and nonlocality. Therefore, it is very important to clarify the relationship between plasma turbulence and anomalous transports. We have approached these complicated problems by analyzing the dynamics, which are recognized as temporal trajectories in a flux-gradient space, rather than using conventional power balance. In particular, in fusion research, it is critical to elucidate the mechanism of electron thermal energy transport, because the incoming burning plasmas are sustained by the heating of alpha particles. In Large Helical Device (LHD), the dynamic relationships between electron thermal fluxes and electron temperature gradients are investigated using modulated electron cyclotron heating and modern electron cyclotron emission diagnostic systems. Some trajectories, such as a hysteresis loop and a line segment with a steep slope, are observed in high-temperature LHD plasmas. Strong nonlinear properties in the transport are revealed by studying the dynamics.",
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