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  • 1
    Online Resource
    Online Resource
    Ship waves in rotating plasma in tokamaks
    AIP Publishing ; 1995
    In:  Physics of Plasmas Vol. 2, No. 9 ( 1995-09-01), p. 3341-3344
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 2, No. 9 ( 1995-09-01), p. 3341-3344
    Abstract: 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).
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.871168
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 1472746-8
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  • 2
    Online Resource
    Online Resource
    Stationary turbulent spectra of toroidal η i mode
    AIP Publishing ; 1996
    In:  Physics of Plasmas Vol. 3, No. 10 ( 1996-10-01), p. 3628-3635
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 3, No. 10 ( 1996-10-01), p. 3628-3635
    Abstract: 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|≫1 and |k| & lt;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.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.871955
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 1472746-8
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  • 3
    Online Resource
    Online Resource
    An influence of frozen-in law violation effects on the turbulent equipartition in tokamaks
    AIP Publishing ; 1998
    In:  Physics of Plasmas Vol. 5, No. 8 ( 1998-08-01), p. 2893-2901
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 5, No. 8 ( 1998-08-01), p. 2893-2901
    Abstract: Analytical investigations and numerical simulations of the influence of frozen-in law violation effects on the turbulent equipartition (TEP) of plasma density n∼1/q through the safety factor q in tokamaks are performed. Namely, the changes of the frozen-in field topology are taken into account due to strong turbulence. The found influence leads to flatter than 1/q density and temperature profiles. For a moderate level of turbulence, another reason for flat equipartition profiles was found analytically, if turbulent mixing of passing electrons takes place. This possibility arises due to conservation of the helicity (AB) integral over frozen-in field lines and produces a flat TEP density profile n∼AB of passing electrons (A is the vector potential of the magnetic field B). These influences have been tested in numerical experiments and the results were compared with experimental data in tokamaks. So, the numerical scaling of combined TEP profile of both trapped and passing electrons is n∼1/q0.5–0.6, which is in good agreement with the experiments.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.873011
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 1472746-8
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  • 4
    Online Resource
    Online Resource
    Self-consistent turbulence in the two-dimensional nonlinear Schrödinger equation with a repulsive potential
    American Physical Society (APS) ; 1999
    In:  Physical Review E Vol. 60, No. 1 ( 1999-7-1), p. 492-499
    Details
    In: Physical Review E, American Physical Society (APS), Vol. 60, No. 1 ( 1999-7-1), p. 492-499
    Type of Medium: Online Resource
    ISSN: 1063-651X , 1095-3787
    URL: Article
    DOI: 10.1103/PhysRevE.60.492
    RVK:
    UA 6500.3.E
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1999
    detail.hit.zdb_id: 2844562-4
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Theory of magnetic electron drift modes
    IOP Publishing ; 1996
    In:  Physica Scripta Vol. T63 ( 1996-01-01), p. 224-233
    Details
    In: Physica Scripta, IOP Publishing, Vol. T63 ( 1996-01-01), p. 224-233
    Type of Medium: Online Resource
    ISSN: 0031-8949 , 1402-4896
    URL: Article
    DOI: 10.1088/0031-8949/1996/T63/037
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 1477351-X
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  • 6
    Online Resource
    Online Resource
    Theory of Drift Wave Turbulence
    IOP Publishing ; 1998
    In:  Physica Scripta Vol. T75, No. 1 ( 1998), p. 145-
    Details
    In: Physica Scripta, IOP Publishing, Vol. T75, No. 1 ( 1998), p. 145-
    Type of Medium: Online Resource
    ISSN: 0031-8949
    URL: Article
    DOI: 10.1238/Physica.Topical.075a00145
    Language: English
    Publisher: IOP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 1477351-X
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  • 7
    Online Resource
    Online Resource
    Spectral transfer in a two-field model of drift wave turbulence
    IOP Publishing ; 1995
    In:  Physica Scripta Vol. 52, No. 5 ( 1995-11-01), p. 561-564
    Details
    In: Physica Scripta, IOP Publishing, Vol. 52, No. 5 ( 1995-11-01), p. 561-564
    Type of Medium: Online Resource
    ISSN: 0031-8949 , 1402-4896
    URL: Article
    DOI: 10.1088/0031-8949/52/5/013
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 1477351-X
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  • 8
    Online Resource
    Online Resource
    Dynamic properties of η i -mode weak turbulence
    Cambridge University Press (CUP) ; 1996
    In:  Journal of Plasma Physics Vol. 55, No. 1 ( 1996-02), p. 47-58
    Details
    In: Journal of Plasma Physics, Cambridge University Press (CUP), Vol. 55, No. 1 ( 1996-02), p. 47-58
    Abstract: The turbulence of the toroidal η i mode has a forward spectral cascade. This means that most of the energy initially placed in the low-wavenumber region (the linear instability region) will be spread out towards high-wavenumber modes. Therefore the linear instability may be reduced by this energy cascade. An elementary estimate of the critical amplitude for nonlinear mode coupling to balance the linear growth rate is given. As a consequence of three wave cascade process derivable from the fully toroidal fluid model equations, the formation of zonal flows η i -mode turbulence is predicted.
    Type of Medium: Online Resource
    ISSN: 0022-3778 , 1469-7807
    URL: Article
    DOI: 10.1017/S0022377800018651
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1996
    detail.hit.zdb_id: 2004297-8
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  • 9
    Online Resource
    Online Resource
    Toroidal η i -mode global vortices in a rotating plasma
    AIP Publishing ; 1996
    In:  Physics of Plasmas Vol. 3, No. 10 ( 1996-10-01), p. 3661-3667
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 3, No. 10 ( 1996-10-01), p. 3661-3667
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.871959
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 1472746-8
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  • 10
    Online Resource
    Online Resource
    Investigation of the turbulent equipartition establishment in tokamaks
    AIP Publishing ; 1999
    In:  Physics of Plasmas Vol. 6, No. 8 ( 1999-08-01), p. 3163-3173
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 6, No. 8 ( 1999-08-01), p. 3163-3173
    Abstract: For a moderate level of turbulence, the self-consistent nonuniform profiles of the turbulent equipartition (TEP) of the density and temperature distribution of magnetized electrons in a tokamak were found analytically and numerically. Only conservation of the adiabatic invariants of the electrons is needed for the solution of this problem. For passing electrons, the profile of the density is determined mainly by the flat radial dependence of the helicity (AB)(r), in contrast to the pinched profile ∼1/q of the trapped electrons determined by the safety factor q(r). The numerically obtained, combined profile of the electron density n∼1/q0.58 was found to be similar to a particular experimental scaling. Also, it was ascertained that the high pinching of the temperature profile is mainly determined by the heating of passing electrons in the potential energy well of the poloidal magnetic field, and depends on the βφ (ratio of the thermal energy to the magnetic one) value. Large values of βφ give small temperature pinching. The TEP distribution also gives one the possibility to obtain self-consistently the profile and the level of the turbulent fluctuations due to the development of quick kinetic instabilities associated with the TEP distribution. The estimation of the time of turbulent mixing of the electrons in the tokamak volume gives a realistic value of the order of 10 ms in the central part of tokamak and 0.1 s in the region near the separatrix.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.873556
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 1472746-8
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