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- W2298495830 abstract "Abstract Understanding of nonlocal electron heat transport is of key importance for current magnetic confinement fusion research. Global nonlocal response presents a fundamental challenge to the standard anomalous transport model based on local microinstabilities and turbulence. Here, we present for the first time a new nonlocal phenomenon triggered by the fishbone instability in HL-2A neutral beam injection plasmas. Rapid core heating leads to a simultaneous decrease in temperature at the plasma edge. The effect reveals fast anomalous transport of core heat pulses to the plasma edge, not compatible with diffusive time scales. More importantly, <?CDATA $Delta {{T}_{text{e}}}/langle {{T}_{text{e}}}rangle $ ?> <?MML <mml:math><mml:mstyle displaystyle='false'><mml:mi mathvariant='normal'>Δ</mml:mi><mml:mstyle displaystyle='false'><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant='normal'>e</mml:mi></mml:mrow></mml:msub></mml:mstyle><mml:mrow><mml:mo>/</mml:mo></mml:mrow><mml:mo stretchy=false>⟨</mml:mo><mml:mstyle displaystyle='false'><mml:msub><mml:mi>T</mml:mi><mml:mrow><mml:mi mathvariant='normal'>e</mml:mi></mml:mrow></mml:msub></mml:mstyle><mml:mo stretchy=false>⟩</mml:mo></mml:mstyle></mml:math> ?> variations at different locations are restricted by the intensity of magnetic fluctuations. The <?CDATA $Delta {{T}_{text{e}}}/langle {{T}_{text{e}}}rangle $ ?> <?MML <mml:math><mml:mstyle displaystyle='false'><mml:mi mathvariant='normal'>Δ</mml:mi><mml:mstyle displaystyle='false'><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant='normal'>e</mml:mi></mml:mrow></mml:msub></mml:mstyle><mml:mrow><mml:mo>/</mml:mo></mml:mrow><mml:mo stretchy=false>⟨</mml:mo><mml:mstyle displaystyle='false'><mml:msub><mml:mi>T</mml:mi><mml:mrow><mml:mi mathvariant='normal'>e</mml:mi></mml:mrow></mml:msub></mml:mstyle><mml:mo stretchy=false>⟩</mml:mo></mml:mstyle></mml:math> ?> and <?CDATA ${{left(delta {{B}_{theta}}right)}_{text{rms}}}$ ?> <?MML <mml:math><mml:mstyle displaystyle='false'><mml:mo stretchy=false>(</mml:mo><mml:mi>δ</mml:mi><mml:mstyle displaystyle='false'><mml:msub><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>θ</mml:mi></mml:mrow></mml:msub></mml:mstyle><mml:mstyle displaystyle='false'><mml:msub><mml:mo stretchy=false>)</mml:mo><mml:mrow><mml:mi mathvariant='normal'>r</mml:mi><mml:mi mathvariant='normal'>m</mml:mi><mml:mi mathvariant='normal'>s</mml:mi></mml:mrow></mml:msub></mml:mstyle></mml:mstyle></mml:math> ?> form two types of hysteresis loops at two sides of the inversion radius. The ECEIs show that the 2D mode structure of the fishbone is intensive shearing/spiraling during the nonlocal transport. Experimental results suggest that magnetic perturbation, long-range correlation, mesoscale structure and <?CDATA $Etimes B$ ?> <?MML <mml:math><mml:mstyle displaystyle='false'><mml:mi>E</mml:mi><mml:mo>×</mml:mo><mml:mi>B</mml:mi></mml:mstyle></mml:math> ?> flow play crucial roles in the nonlocal response. The Hurst exponent and auto-correlation coefficient indicate that the nonlocal transport is potentially linked to the self-organized critical (SOC) dynamics. This work will be beneficial for understanding of the plasma dynamics in future fusion reactors." @default.
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- W2298495830 date "2016-03-16" @default.
- W2298495830 modified "2023-09-22" @default.
- W2298495830 title "Dynamics between the fishbone instability and nonlocal transient transport in HL-2A NBI plasmas" @default.
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- W2298495830 doi "https://doi.org/10.1088/0029-5515/56/4/044001" @default.
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