Observation of Long-Distance Radial Correlation in Toroidal Plasma Turbulence

Inagaki, S.; Tokuzawa, T.; Itoh, K.; Ida, K.; Itoh, Sanae I.; Tamura, N.; Sakakibara, S.; Kasuya, Naohiro; Fujisawa, A.; Kubo, S.; Shimozuma, Τ.; Ido, T.; Nishimura, S.; Arakawa, Hiroyuki; Kobayashi, Tatsuya; Tanaka, Kaoru; Nagayama, Y.; Kawahata, K.; Sudo, S.; Yamada, H.; Komori, A.

doi:10.1103/physrevlett.107.115001

Cited by 69 publications

(96 citation statements)

References 34 publications

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“…Such nonlinearly driven fluctuations can have substantial influence on turbulent transport12. By solving the stochastic equation, the amplitude of nonlinearly-driven long-range fluctuations has been evaluated11.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, the plasma heating via radio frequency waves can modify the distribution function of trapped particles2 in phase space (trapped particles are limited in velocity space, and subject to restricted motion in real space), and such process can be quantified. An analysis on the growth rate of dissipative-trapped particle instability2 was performed18, and it was shown that the influence of this new mechanism is substantial for the low-frequency trapped particle modes to which the long-range fluctuation in ref 12. was attributed.…”

Section: Discussionmentioning

confidence: 99%

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New Thermodynamical Force in Plasma Phase Space that Controls Turbulence and Turbulent Transport

Itoh

2012

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Physics of turbulence and turbulent transport has been developed on the central dogma that spatial gradients constitute the controlling parameters, such as Reynolds number and Rayleigh number. Recent experiments with the nonequilibrium plasmas in magnetic confinement devices, however, have shown that the turbulence and transport change much faster than global parameters, after an abrupt change of heating power. Here we propose a theory of turbulence in inhomogeneous magnetized plasmas, showing that the heating power directly influences the turbulence. New mechanism, that an external source couples with plasma fluctuations in phase space so as to affect turbulence, is investigated. A new thermodynamical force in phase-space, i.e., the derivative of heating power by plasma pressure, plays the role of new control parameter, in addition to spatial gradients. Following the change of turbulence, turbulent transport is modified accordingly. The condition under which this new effect can be observed is also evaluated.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

New Thermodynamical Force in Plasma Phase Space that Controls Turbulence and Turbulent Transport

Itoh

2012

Sci Rep

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“…In well diagnosed laboratory plasmas, coexistence and interaction (Fujisawa 2011;Diamond et al 2011) between small scale drift turbulence (Tynan et al 2009) and large scale coherent nonlinear structures-zonal flows (Diamond et al 2005), streamers (Yamada et al 2008), and other objects that exhibit long range correlation (Inagaki et al 2011)-is an established feature which is central to the phenomenology of the global system (Wagner 2007). Approaches to modelling this span the zero-dimensional Lotka-Volterra predatorprey paradigm (Malkov and Diamond 2009), nonlinear few-wave coupling (Manfredi et al 2001), and large scale numerical simulations, which however are challenged by the need to incorporate a wide range of physically relevant lengthscales.…”

Section: Non-diffusive Transport Arising From the Combination Of Smalmentioning

confidence: 99%

Nonclassical Transport and Particle-Field Coupling: from Laboratory Plasmas to the Solar Wind

et al. 2013

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Understanding transport of thermal and suprathermal particles is a fundamental issue in laboratory, solar-terrestrial, and astrophysical plasmas. For laboratory fusion experiments, confinement of particles and energy is essential for sustaining the plasma long enough to reach burning conditions. For solar wind and magnetospheric plasmas, transport properties determine the spatial and temporal distribution of energetic particles, which can be harmful for spacecraft functioning, as well as the entry of solar wind plasma into the magnetosphere. For astrophysical plasmas, transport properties determine the efficiency of particle acceleration processes and affect observable radiative signatures. In all cases, transport depends on the interaction of thermal and suprathermal particles with the electric and magnetic fluctuations in the plasma. Understanding transport therefore requires us to understand these interactions, which encompass a wide range of scales, from magnetohydrodynamic to kinetic scales, with larger scale structures also having a role. The wealth of transport studies during recent decades has shown the existence of a variety of regimes that differ from the classical quasilinear regime. In this paper we give an overview of nonclassical plasma transport regimes, discussing theoretical approaches to superdiffusive and subdiffusive transport, wave-particle interactions at microscopic kinetic scales, the influence of coherent structures and of avalanching transport, and the results of numerical simulations and experimental data analyses. Applications to laboratory plasmas and space plasmas are discussed.

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“…1, 3 Large scale vortex has been found to be also driven by turbulence. [4][5][6][7] Other nonlinear coherent structures formed by the drift waves, such as drift solitons, have been studied. [8][9][10] There are variety of nonlinear fundamental processes of the turbulence, which should be understood.…”

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confidence: 99%

Formation mechanism of steep wave front in magnetized plasmas

et al. 2015

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Bifurcation from a streamer to a solitary drift wave is obtained in three dimensional simulation of resistive drift waves in cylindrical plasmas. The solitary drift wave is observed in the regime where the collisional transport is important as well as fluctuation induced transport. The solitary drift wave forms a steep wave front in the azimuthal direction. The phase of higher harmonic modes are locked to that of the fundamental mode, so that the steep wave front is sustained for a long time compared to the typical time scale of the drift wave oscillation. The phase entrainment between the fundamental and second harmonic modes is studied, and the azimuthal structure of the stationary solution is found to be characterized by a parameter which is determined by the deviation of the fluctuations from the Boltzmann relation. There are two solutions of the azimuthal structures, which have steep wave front facing forward and backward in the wave propagation direction, respectively. The selection criterion of these solutions is derived theoretically from the stability of the phase entrainment. The simulation result and experimental observations are found to be consistent with the theoretical prediction.

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Observation of Long-Distance Radial Correlation in Toroidal Plasma Turbulence

Cited by 69 publications

References 34 publications

New Thermodynamical Force in Plasma Phase Space that Controls Turbulence and Turbulent Transport

New Thermodynamical Force in Plasma Phase Space that Controls Turbulence and Turbulent Transport

Nonclassical Transport and Particle-Field Coupling: from Laboratory Plasmas to the Solar Wind

Formation mechanism of steep wave front in magnetized plasmas

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