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AbstractAbstract

[en] Using a partial numerical simulation, the nonlinear stage of electron cyclotron instability was considered in a single-mode regime. It is shown that the trapping of resonance ions may lead to the stabilization of the kinetic instability. The maximum amplitude of the field is determined for such a mechanism of stabilization, and the condition of the latter applicability is found. (MOW)

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Conference on electrostatic and electromagnetic confinement of plasmas and the phenomenology of relativistic electron beams; New York, NY; 5 Mar 1974

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Journal Article

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Conference

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Annals of the New York Academy of Sciences; v. 251 p. 312-321

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Beasley, C.O. Jr.; Lominadze, J.G.; Mikhailovskii, A.B.

Oak Ridge National Lab., Tenn. (USA)

Oak Ridge National Lab., Tenn. (USA)

AbstractAbstract

[en] The excitation of Alfven waves by fast untrapped ions in axisymmetric tokamaks is described by the dispersion relation epsilon

_{11}- c^{2}k/sub parallel bars/^{2}/ω^{2}= 0. Using this relation a new class of instability connected with the excitation of Alfven oscillations is described. (U.S.)Primary Subject

Source

Aug 1975; 9 p

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Report

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Gedalin, M.E.; Lominadze, J.G.

Proceedings of an International school and workshop on plasma astrophysics, 24 August- 3 September 1988, Varenna, Italy

Proceedings of an International school and workshop on plasma astrophysics, 24 August- 3 September 1988, Varenna, Italy

AbstractAbstract

[en] A quasiperpendicular shock is considered as a structure, evolved from a fast magnetosonic nonlinear wave. Due to the steepening and tendency towards overturning the scales become smaller and the ramp is an intermediate whistler. The noncoplanar magnetic field component in the ramp appears in a quite natural way. The ramp is characterized by a large peak of the potential electric field, its width is much smaller than the ramp width. It is shown that in such a case electrons are heated efficiently. Ions are heated also, the heating process is closely related to the shock drift acceleration. (author). 8 refs.; 6 figs

Primary Subject

Source

Guyenna, T.D.; Hunt, J.J (European Space Research and Technology Centre, Noordwijk (Netherlands)) (eds.); ESA-SP; no. 285 (v.1); 414 p; 1989; p. 143-151; ESTEC; Noordwijk (Netherlands); Joint Varenna-Abastumani international school and workshop on plasma astrophysics; Varenna (Italy); 24 Aug - 3 Sep 1988; ISSN 0379-6566;

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AbstractAbstract

[en] A new model is offered for explaining the millisecond variability of Cyg X-1 and related sources, based on the bimodal accretion model for Cyg X-1. In the region of the main energy, release action of the Parker instability leads to the formation of three to five (depending on concrete circumstances) oblong-shaped magnetic arcs within the whole azimuth. Those are the magnetic arcs which make up, consequently, an optically thin hot corona needed for explaining the low state spectrum of Cyg X-1. Rapid rotation of the stretched magnetic arcs leads to fast variations of their lengths scales along the line of sight. Accordingly, the optical depth of each arc with respect to Thomson scattering, tau, will also vary, leading to the variations of spectral indices of arcs determined in terms of tau for the inverse Compton scattering. In its turn, it leads to rapid variations of photon count rates in the proper energy range. The described mechanism is effective when n = 3 (n is the number of arcs) but for n = 5 it is essentially weakened; i.e., in the latter case fast variations are actually absent. 24 refs

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Chen, L.; Berger, R.L.; Lominadze, J.G.; Rosenbluth, M.N.; Rutherford, P.H.

Princeton Univ., N.J. (USA). Plasma Physics Lab

Princeton Univ., N.J. (USA). Plasma Physics Lab

AbstractAbstract

[en] It is shown that trapped-electron induced scattering can be dominant over nonlinear ion Landau damping in the saturation of short-wavelength dispersive trapped-electron instabilities in tokamaks. Trapped-electron induced scattering transfers the wave energy to shorter wavelengths, where it can be dissipated by ion viscosity

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Mar 1977; 16 p; Available from NTIS., PC A02/MF A01

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Lominadze, J.G.; Javakhishvili, J.I.; Tsikarishvili, E.G.

Nagoya Univ. (Japan). Plasma Science Center

Nagoya Univ. (Japan). Plasma Science Center

AbstractAbstract

[en] The paper presents a closed set of hydrodynamical equations based on a relativistic kinetic equation. This set of equations describes relativistic strongly magnetized plasma with an anisotropic pressure tensor. Such a model was suggested previously by Chew, Goldberger and Low for nonrelativistic plasma. Here, the main macroscopic parameters in the relativistic theory are determined based on a relativistic kinetic equation. Then, a closed system of hydrodynamic equations for relativistic collisionless plasma is derived. Thus, it is shown that a closed set of hydrodynamical equations for collisionless relativistic plasma in a strong magnetic field can be formulated. Such a strong magnetic field leads to anisotropy of macroscopic parameters of the plasma. The equations obtained are rather complicated, though analogous to those derived from the nonrelativistic theory. The difference is that the relativistic theory requires a larger number of parameters to describe the plasma: instead of the six unknown quantities in the nonrelativistic case, nine quantities are necessary in the relativistic case. (N.K.)

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Nov 1989; 14 p

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Report

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Kaladze, T.D.; Lominadze, J.G.; Mikhailovskii, A.B.

Second international congress on waves and instabilities in plasmas held at Innsbruck, Austria, 17-21 Mar 1975

Second international congress on waves and instabilities in plasmas held at Innsbruck, Austria, 17-21 Mar 1975

AbstractAbstract

[en] In the connection with construction of large thermonuclear devices of Tokamak type, studies of the effects caused by α-particles, formed in the fusion reactions, become more and more actual. The development of experiemental studies of the Tokamak problem required elucidation of the problem to what extent the theory of instabilities of α-particles, developed in the approximation of the uniform magnetic field, can be used under the condition of the curved magnetic field of a Tokamak and studies of those types of instabilites of α-particles for which the geometry of the magnetic field is important. This paper reviews the main results of the linear theory of instabilities of α-particles, developed with taking account of the Tokamak geometry and the quasilinear theory of relaxation of α-particles. (Auth.)

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Source

Auer, G.; Cap, F. (eds.); Innsbruck Univ. (Austria). Inst. fuer Theoretische Physik; p. L1-L9; 1975; Innsbruck University; Innsbruck, Austria; 2. international congress on waves and instabilities in plasmas; Innsbruck, Austria; 17 Mar 1975

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Chagelishvili, G.D.; Lominadze, J.G.; Rogava, A.D.

Proceeding of an International school and workshop on Plasma astrophysics, 24 August-3 September 1988, Varenna, Italy

Proceeding of an International school and workshop on Plasma astrophysics, 24 August-3 September 1988, Varenna, Italy

AbstractAbstract

[en] We consider the size of region of the main energy release of black hol acretion discs. This problem is deeply connected with accretion process at the innermost region of accretion disc and with boundary condition at its inner edge. Ou main result is demonstration that the region of the main energy release is strongly localized. It is shown that for accretion onto non-rotating black hol the main portion of the liberated energy is released within a rather narrow radial range 5N≤13M. This property can have profound effect on spectrum and variability of the radiation of the acretion disc as a whole. In particular, the asymmetry of the main energy release region is favourable for the mechanism of the millisecond variability proposed earlier by the authors. (author). 15 refs.; 5 figs

Primary Subject

Source

Guyenne, T.D.; Hunt, J.J. (European Space Research and Technology Centre, Noordwijk (Netherlands)) (eds.); ESA-SP; no. 285 (v. 1); 414 p; 1989; p. 265-269; ESTEC; Noordwijk (Netherlands); Joint Varenna-Abastumani international school and workshop on plasma astrophysics; Varenna (Italy); 24 Aug - 3 Sep 1988; ISSN 0379-6566;

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AbstractAbstract

[en] The paper gives results obtained from the theory of linear and nonlinear waves propagating in relativistic electron-positron plasma with a strong external magnetic field. The possible application of these results to explain the radiation mechanism in pulsars is discussed. The nonlinear equation describing the behaviour of the amplitude profile of the waves, propagating at an angle to the external magnetic field is studied in the low frequency region. The radiation intensity of a pulsar is calculated in terms of soliton solution of the equation. The results obtained are compared with the experimental data. Two mechanisms of formation of bunches along the magnetic field are considered. The first mechanism is due to propagation of Langmuir waves along the magnetic field in the case when the distribution functions of electrons and positrons do not coincide, or when there is a small admixture of protons in plasma. The second mechanism is the propagation of an Alfven wave soliton at a small angle to the magnetic field. It is shown that in propagating of a magnetosonic soliton at an angle to the curved magnetic field the plane of polarization rotates. (Auth.)

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Source

1982 international conference on plasma physics; Goeteborg (Sweden); 9 - 15 Jun 1982; 51 refs.

Record Type

Journal Article

Literature Type

Conference

Journal

Physica Scripta; ISSN 0031-8949; ; v. T2(1); p. 215-222

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ALFVEN WAVES, BEAM-PLASMA SYSTEMS, BIBLIOGRAPHIES, CRAB NEBULA, CYCLOTRON INSTABILITY, DISPERSION RELATIONS, DISTRIBUTION FUNCTIONS, ELECTRONS, EMISSION, GAMMA RADIATION, MAGNETIC FIELDS, NONLINEAR PROBLEMS, PLASMA WAVES, POSITRONS, PULSARS, RADIOWAVE RADIATION, RELATIVISTIC PLASMA, REVIEWS, SCHROEDINGER EQUATION, SOLITONS, STELLAR MAGNETOSPHERES, VISIBLE RADIATION, WAVE PROPAGATION, X RADIATION

ANTILEPTONS, ANTIMATTER, ANTIPARTICLES, ATMOSPHERES, COSMIC RADIO SOURCES, DIFFERENTIAL EQUATIONS, DOCUMENT TYPES, ELECTROMAGNETIC RADIATION, ELEMENTARY PARTICLES, EQUATIONS, FERMIONS, HYDROMAGNETIC WAVES, INSTABILITY, IONIZING RADIATIONS, LEPTONS, MATTER, NEBULAE, PARTIAL DIFFERENTIAL EQUATIONS, PLASMA, PLASMA INSTABILITY, PLASMA MICROINSTABILITIES, QUASI PARTICLES, RADIATIONS, STELLAR ATMOSPHERES, SUPERNOVA REMNANTS, WAVE EQUATIONS

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Chagelishvili, G.D.; Chanishvili, R.G.; Lominadze, J.G.; Tevzadze, A.G.

Proceedings of the 1996 international conference on plasma physics

Proceedings of the 1996 international conference on plasma physics

AbstractAbstract

[en] Evolution of three dimensional magnetohydrodynamic (MHD) waves (fast magnetosonic (FMW), slow magnetosonic (SMW) and Alfven waves) is studied in unbounded parallel flows with uniform shear of velocity and uniform magnetic field directed along the flow. The energy exchange between the MHD waves and background flow is explored. This process is noticeably different for each type of wave and is characterized by the unusual (algebraic) behaviour for linear amplification processes. Another novelty is demonstrated in wave linear evolution process - coupling of MHD waves and their mutual transformations are originated in a limited time interval for a wide range of system (flow and waves) parameters. Revelation of the results becomes possible owing to the nonmodal linear approach. The change of understanding of flow turbulence due to the coupling of the MHD modes is discussed. (author)

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Sugai, H. (Nagoya Univ. (Japan). Faculty of Engineering); Hayashi, T. (eds.); 2147 p; ISBN 4-9900586-1-5; ; ISBN 4-9900586-2-3; ; 1997; p. 154-157; Japan Society of Plasma Science and Nuclear Fusion Research; Nagoya (Japan); ICPP96: 1996 international conference on plasma physics; Nagoya (Japan); 9-13 Sep 1996

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