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  • 1
    Electronic Resource
    Electronic Resource
    Toroidal ηi-mode global vortices in a rotating plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3661-3667 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Model equations describing dynamics of a toroidal ηi mode in a rotating plasma are derived. The stationary solution of the model equations is investigated analytically and the condition for global vortex formation is found. The form of the solution is verified numerically and it is shown that the shape of global vortices is affected strongly by the shear of the plasma poloidal rotation. In weak shear, the stationary solution looks like a dipole vortex, while in strong shear, the main part of the plasma cross section is occupied by vortex flow. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871959
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  • 2
    Electronic Resource
    Electronic Resource
    Ship waves in rotating plasma in tokamaks (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3341-3344 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma rotation can lead to excitation of waves in the plasma by perturbations that have zero frequency in the laboratory frame. Drift waves have minimum velocity threshold for excitation. Potential drift waves with kρi≤0.1 (k is the wave number, ρi is the ion cyclotron radius) excited at the edge and propagating toward the plasma interior are used to explain some nonlocal properties of plasma transport observed experimentally in transitions from the low (L) to high (H) confinement regime (L–H transitions). © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871168
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  • 3
    Electronic Resource
    Electronic Resource
    Global ship waves in poloidally rotating tokamak plasma (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1539-1546 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma rotation can lead to excitation of ship waves that have zero frequency in the laboratory frame. Ship waves of a drift type that have a global structure of a quasimode in a poloidally rotating toroidal plasma are considered for an axisymmetric, large aspect-ratio tokamak with concentric, circular magnetic surfaces. The analysis performed is based on rigorously derived eigenmode equations, coupled in poloidal mode numbers through the toroidal effects. Analytical dispersion relations for global drift ship waves are obtained and their simple solutions are found for some limiting cases. These global ship waves, resonantly excited due to a plasma rotation near the plasma edge, may give a simple explanation for the observed phenomenon of the fast response of the electron transport over a wide radial region in transitions from the low (L) to high (H) confinement regime (L–H transitions). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873407
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  • 4
    Electronic Resource
    Electronic Resource
    Global drift modes in rotating tokamak plasmas (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3311-3318 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Drift waves in a rotating toroidal plasma are considered for an axisymmetric, large aspect-ratio tokamak with concentric, circular magnetic surfaces. The analysis performed is based on rigorously derived eigenmode equations, coupled in poloidal mode numbers through the toroidal effects. Analytical dispersion relations for both global and propagating drift waves are obtained and their simple solutions are found for some limiting cases. The principal effect of plasma rotation is that the global drift mode existence criterion can be satisfied for large values of the magnetic shear parameter, s〉1/2, in the case of sufficiently high rotation velocity, when the Doppler shifted eigenfrequency changes sign. Such plasma rotation velocities have been observed in the Doublett III-D (DIII-D) tokamak in the high (H)-mode confinement regime [Kim et al., Phys. Rev. Lett. 72, 2199 (1994)]. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872998
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  • 5
    Electronic Resource
    Electronic Resource
    Spectral and statistical properties of a two-field electron drift model (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2140-2147 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The weakly nonlinear theory of two-dimensional electron drift modes is outlined and a double energy cascade is demonstrated, due to the presence of two rugged invariants. Statistical equilibrium spectra of the fully and weakly nonlinear systems are calculated using a discrete Fourier mode phase space and Hopf's equation. A Monte Carlo simulation based on the weakly nonlinear theory gives a detailed energy spectrum with several similarity ranges, suggesting the existence of an approximate additional local (in k space) quadratic invariant. The inhomogeneity of the underlying system is reflected by spectral anisotropy. Some general problems of statistical fluid mechanics are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870612
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  • 6
    Electronic Resource
    Electronic Resource
    Stationary turbulent spectra of toroidal ηi mode (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3628-3635 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Toroidal ion temperature gradient (ITG) driven drift mode turbulence has been analyzed analyti- cally and numerically. By using weak nonlinearity arguments and random phase approxima- tion, dynamic and wave kinetic equations are derived. Three different nonlinearities, namely E×B, convective, and diamagnetic nonlinearities, play important roles in the turbulent spectral transfer. The power spectra of the weak ITG-mode turbulence are obtained analytically for |k|(very-much-greater-than)1 and |k|〈1 ranges in the wave number space. Forward energy cascading due to convective and diamagnetic nonlinearities will balance the inverse energy cascading due to E×B nonlinearity at |k|≈1/ρs (k is the wave number, ρs=cs/ωci, where cs is the sound velocity and ωci is the ion cyclotron frequency) and results in energy condensation at |k|≈1/ρs. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871955
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  • 7
    Electronic Resource
    Electronic Resource
    Hamiltonian description and stability of magnetic electron vortices (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1980-1985 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Hamiltonian description and integral invariants of two-dimensional magnetic electron modes are derived. Vortex street solutions are given. Using the integrals, linear stability for long wavelength perturbations is established. It is shown that nonlinear stability cannot be proven using Arnol'd's method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860786
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  • 8
    Electronic Resource
    Electronic Resource
    Subcritical reactive drift wave turbulence (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 402-408 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The existence of self-sustained toroidal ηi-mode turbulence below the instability threshold has been shown by mode coupling simulations. Significant transport and a tendency for long-wavelength condensation are observed. The subcritical behavior is explained as a result of nonlinear interaction between modes of positive and negative energy by analytical calculation of the coupling factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860525
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  • 9
    Electronic Resource
    Electronic Resource
    Stationary propagating magnetic electron vortices (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1386-1391 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear theory of the magnetic electron mode is developed. It is shown that the model equations describing this mode has stationary localized solutions of the monopole vortex type. The vortices travel in the direction perpendicular to the inhomogeneities of the plasma with a velocity determined by the ratio between the temperature perturbation and the magnetic field of the vortex. For the vortex to be stationary and localized, this velocity must be larger than the phase velocity of the linear waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859704
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