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Konovalov, S. V.; Mikhailovskii, A. B.*; Ozeki, Takahisa; Takizuka, Tomonori; Shirokov, M. S.*; Hayashi, Nobuhiko
Plasma Physics and Controlled Fusion, 47(12B), p.B223 - B236, 2005/12
Times Cited Count：7 Percentile：24.18(Physics, Fluids & Plasmas)Neoclassical Tearing Modes, NTMs, are known to limit the maximum attainable plasma pressure, degrade confinement and, at worst, culminate in disruption of the tokamak discharges. Key role in NTM evolution belongs to the radial profiles of the plasma flow, temperature and density which are determined by the conjunction of the longitudinal and cross-filed transport arising from thermal conduction, particle diffusion, and viscosity. In this report the influence of anomalous perpendicular heat transport and anomalous ion perpendicular viscosity on early stage of the NTM evolution is studied theoretically.
Konovalov, S. V.; Mikhailovskii, A.*; Ozeki, Takahisa; Takizuka, Tomonori; Shirokov, M. S.*; Hayashi, Nobuhiko
Proceedings of 20th IAEA Fusion Energy Conference (FEC 2004) (CD-ROM), 8 Pages, 2004/11
Influence of anomalous perpendicular heat transport and anomalous perpendicular viscosity on conditions of Neoclassical Tearing Mode onset is studied theoretically. Series of different parallel transport mechanisms competitive to anomalous cross-island heat conductivity in the perturbed temperature profile are considered.In the transport threshold model, magnetic curvature effect is as much important as bootstrap drive weakened by the finite perpendicular heat transport. Perpendicular viscosity brings island-rotation-frequency dependence of the transport threshold model.
n eigenmodesKonovalov, S. V.; Mikhailovskii, A. B.*; Shirokov, M. S.*; Kovalishen, E. A.*; Ozeki, Takahisa
Physics of Plasmas, 11(9), p.4531 - 4534, 2004/09
Times Cited Count：19 Percentile：52.18(Physics, Fluids & Plasmas)no abstracts in English
Konovalov, S. V.; Mikhailovskii, A. B.*; Kovalishen, E. A.*; Kamenets, F. F.*; Ozeki, Takahisa; Shirokov, M. S.*; Takizuka, Tomonori; Tsypin, V. S.*
Doklady Physics, 49(7), p.405 - 408, 2004/07
Times Cited Count：1 Percentile：11.66(Mechanics)Effect of feedback system, placed outside the vacuum vessel, on neoclassical tearing modes (NTMs) in tokamaks is analytically studied. External matching parameters for magnetic island chain are derived for the simplest case of step profile of equilibrium parallel current. The structure of dynamical equations for the island width and island rotation frequency in terms of matching parameters is explained. It is shown that such a feedback system can lead to essential shift of the island rotation, in particular, for stabilization of NTMs by the polarization current effect.
n cascades in tokamaksKonovalov, S. V.; Mikhailovskii, A. B.*; Shirokov, M. S.*; Ozeki, Takahisa
Physics of Plasmas, 11(5), p.2303 - 2306, 2004/05
Times Cited Count：11 Percentile：34.13(Physics, Fluids & Plasmas)no abstracts in English
Mikhailovskii, A. B.*; Kovalishen, E. A.*; Shirokov, M. S.*; Konovalov, S. V.; Tsypin, V. S.*; Kamenets, F. F.*; Ozeki, Takahisa; Takizuka, Tomonori
Physics of Plasmas, 11(2), p.666 - 676, 2004/02
Times Cited Count：6 Percentile：19.41(Physics, Fluids & Plasmas)Analytical treatment of magnetic islands with high poloidal mode numbers and widths smaller than ion Larmor radius (microislands) is presented. The profile functions and rotation frequencies of microislands are investigated with the two-fluid magnetohydrodynamics. The microislands are described in terms of two profile functions, one of which characterizes the electric field and perturbed plasma density, and second the perturbed electron temperature. The problem of rotation frequencies of microislands is discussed.
Konovalov, S. V.; Mikhailovskii, A.*; Kovalishen, E.*; Ozeki, Takahisa; Takizuka, Tomonori; Shirokov, M. S.*
Proceedings of 20th IAEA Fusion Energy Conference (FEC 2004) (CD-ROM), 8 Pages, 2004/00
Alfven eigenmodes in tokamaks with reversed magnetic shear are studied theoretically by incorporating into the mode description the effects known theories of Global, Kinetic and Toroidal Alfven Eigenmodes. In particular mode forming effect due to thermal plasma density gradient is examined. Criteria of the fast ion density and its gradient on the existence of a localized solution of the eigenmode equation is softened by this effect. Effects of finite Larmor radius, continuum damping and fast ion density gradient are also studied.
Konovalov, S. V.; Mikhailovskii, A. B.*; Tsypin, V. S.*; Kovalishen, E. A.*; Shirokov, M. S.*; Ozeki, Takahisa; Takizuka, Tomonori
Physics Letters A, 318(4-5), p.429 - 434, 2003/11
Times Cited Count：7 Percentile：46.11(Physics, Multidisciplinary)no abstracts in English
Mikhailovskii, A. B.*; Shirokov, M. S.*; Tsypin, V. S.*; Konovalov, S. V.; Ozeki, Takahisa; Takizuka, Tomonori; Galv
o, R. M. 0.*; Nascimento, I. C.*
Physics of Plasmas, 10(10), p.3975 - 3983, 2003/10
Times Cited Count：8 Percentile：25.37(Physics, Fluids & Plasmas)A transport threshold model of subsonic neoclassical tearing modes (NTMs) in tokamaks is developed. The basic procedure is to include the velocity-dependent term into the single-fluid heat-conductivity equation. and to supply the parallel plasma motion equation. These equations permit the determination of the perturbed plasma temperature and the bootstrap current drive of NTMs, for both strong and weak perpendicular heat transport. It is shown that the subsonic NTMs transport threshold model can be more realistic than the standard transport threshold model of NTMs.
Mikhailovskii, A. B.*; Shirokov, M. S.*; Tsypin, V. S.*; Konovalov, S. V.*; Ozeki, Takahisa; Takizuka, Tomonori; Galvo, R. M. 0.*; Nascimento, I. C.*
Physics of Plasmas, 10(9), p.3790 - 3792, 2003/09
Times Cited Count：5 Percentile：16.70(Physics, Fluids & Plasmas)A fluid treatment of convective-transport threshold model of neoclassical tearing modes (NTMs) in tokamaks is developed. A system of moment equations of the drift kinetic equation with a model perpendicular transport is derived. The essence of this moment equation system is to allow for the parallel heat flux on an equal footing with pressure and temperature. The suggested moment equation system is applied for analyzing the bootstrap current drive of NTMs. As a result, a threshold model of these modes is derived, which coincides qualitatively with the convective-transport threshold model initially formulated by means of intuitive consideration.
Mikhailovskii, A. B.*; Churikov, A. P.*; Konovalov, S. V.; Shirokov, M. S.*; Tsypin, V. S.*
Doklady Physics, 48(4), p.159 - 162, 2003/04
Times Cited Count：1 Percentile：12.72(Mechanics)It is shown that there is a new class of perturbations, limiting the pressure of ideally stable plasma in the conditions of fusion reactors of tokamak type. localization of such modes includes three characteristic regions: large-scale (MHD), Larmor and sub-Larmor ones. It is suggested that these modes can be responsible for spontaneous generation of neoclassical tearing modes observed experimentally.
