Selection rule for turbulent structural formation: study of magnetized cylindrical plasmas

Kasuya, Naohiro; Yagi, M.; Itoh, K.; Itoh, Sanae–I.

doi:10.1088/1742-6596/123/1/012026

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…Nonlinear processes determine the oscillation frequency. It is found that a modification of the radial profile contributes to the variation of mode energy [32]. The oscillation occurs only when a small number of, but more than two, modes contribute to the formation of the turbulent structure.…”

Section: Nonlinear Simulationmentioning

confidence: 94%

Selective formation of streamers in magnetized cylindrical plasmas

Kasuya¹,

Yagi²,

Itoh³

et al. 2010

Nucl. Fusion

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Turbulent plasmas form a variety of mesoscale structures, which affect the level of anomalous transport in fusion plasmas. A streamer is a poloidally localized, radially elongated vortex, which increases convective transport. We have carried out numerical simulations of resistive drift wave turbulence in a linear configuration, as a minimal model for analysing the structural formation mechanism in magnetized plasmas by mode coupling. A three-field reduced MHD model is extended to describe the resistive drift wave turbulence in cylindrical plasmas. A poloidally localized turbulent structure, which has the typical temporal scale of the streamer, is formed by the self-bunching of a couple of unstable modes in nonlinear saturation states. The formed structure depends on the magnitude of the ion–neutral collision frequency, which is the damping parameter of the zonal flow, and the streamer is formed when the damping of the zonal flow is stronger than that of the intermediate mode for the streamer formation. We found that the streamer is selectively formed to keep the particle balance as long as the drift wave is unstable.

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Section: Nonlinear Simulationmentioning

confidence: 94%