TY - JOUR
T1 - Selection rule for turbulent structural formation
T2 - Study of magnetized cylindrical plasmas
AU - Kasuya, N.
AU - Yagi, M.
AU - Itoh, K.
AU - S-I Itoh, Itoh
PY - 2008
Y1 - 2008
N2 - The three-field reduced fluid model was extended to describe the resistive drift wave turbulence in magnetized cylindrical plasmas. There include multiple energy exchange paths, and two kinds of nonlinear steady states were obtained in simulations with a fixed particle source: one with a zonal flow generated by modulational coupling of various unstable modes, which suppress transport, and the other with a streamer, which is a azimuthally-localized vortex structure and induces convective transport, formed by parametric coupling. These structures are formed selectively, depending on the ion-neutral collision frequency, which is a damping force of a zonal flow and has a stabilizing effect of linear instability in this model. This is a minimal model for analyzing the turbulent structural formation mechanism by mode coupling in cylindrical plasmas, and competitive nature of structural formation was revealed.
AB - The three-field reduced fluid model was extended to describe the resistive drift wave turbulence in magnetized cylindrical plasmas. There include multiple energy exchange paths, and two kinds of nonlinear steady states were obtained in simulations with a fixed particle source: one with a zonal flow generated by modulational coupling of various unstable modes, which suppress transport, and the other with a streamer, which is a azimuthally-localized vortex structure and induces convective transport, formed by parametric coupling. These structures are formed selectively, depending on the ion-neutral collision frequency, which is a damping force of a zonal flow and has a stabilizing effect of linear instability in this model. This is a minimal model for analyzing the turbulent structural formation mechanism by mode coupling in cylindrical plasmas, and competitive nature of structural formation was revealed.
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U2 - 10.1088/1742-6596/123/1/012026
DO - 10.1088/1742-6596/123/1/012026
M3 - Article
AN - SCOPUS:65249149506
SN - 1742-6588
VL - 123
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
M1 - 012026
ER -