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  • 1990-1994  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Temperature anisotropy effect on the toroidal ion temperature gradient mode (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 152-158 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the local kinetic and fluid approaches, the effects of the anisotropies in the ion temperature and in the ion temperature gradient on the toroidal ion temperature gradient driven mode are investigated. A study of the effect of the increasing ion temperature relative to the fixed electron temperature in the peaked density limit is also made. Comparisons are given between the new toroidal results and the previous slab results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860428
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Global modes and high-energy particles in ignited plasmas (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 927-943 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fusion-produced alpha particles may spontaneously enhance the stability of an ignited plasma against m=1 internal modes. Stable values of the poloidal beta of the thermal plasma component significantly in excess of the ideal magnetohydrodynamic threshold can be attained, provided the region where the magnetic helical parameter q is below unity is not too wide and the ignition temperature is not too high. A comprehensive analysis of the different instability regimes is presented, with special attention to so-called "fishbone oscillations'' and their influence on the ignition energy balance. The theoretical predictions compare favorably with sawtooth suppression experiments in the JET tokamak [Phys. Rev. Lett. 60, 2148 (1988)] with high-power, ion-cyclotron resonant frequency heating, where energetic ions in the MeV range are produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859240
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Change of confinement properties and transition from absolute to non-normal mode microinstabilities (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2817-2822 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The change in confinement properties that can be induced in experiments, where the plasma is heated by an external injection system, is considered to be related to the transition from a regime where "absolute'' microinstabilities are excited at the edge of the plasma column to a regime where these microinstabilities can exist only as non-normal modes because of the effects of the local gradient of the E×B rotation frequency that is induced. Ion-temperature-gradient-driven modes are analyzed as an important example and the threshold conditions for their disappearances as normal modes are evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860155
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Symmetries and global transport equations (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2582-2590 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The anomalous transport of the electron thermal energy and that of the longitudinal current density are related to each other and described by a diffusion matrix equation. The symmetry properties of the matrix diffusion coefficients are identified and used to prescribe realistic conditions on the radial profiles of the electron temperature T and of the current density J(parallel).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859970
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Candidate mode for electron thermal energy transport in multi-keV plasmas (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 2322-2333 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear and quasilinear theory of the collisionless trapped electron mode (also called the "ubiquitous'' mode) is analyzed, in order to illustrate its possible role in the electron thermal energy transport observed in magnetically confined plasmas. This instability is driven by the combined effects of the plasma pressure gradient (which includes the contributions from the temperature gradients of ions and electrons) and of the local magnetic curvature drift of trapped electrons and of circulating and trapped ions. Depending on the value of its wavelength across the magnetic field, this mode can connect with a branch of the ion temperature gradient instability, provided the ion temperature gradient is sufficiently strong. Also, under certain conditions, it can be driven unstable solely by a combination of electron temperature gradient and Landau damping by trapped electrons. The relevant modes are found to be robust against variation of parameters such as the electron collisionality, and to be consistent candidates in order to explain the experimentally observed rate of electron thermal energy transport from the center of the plasma column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859497
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    Paper (German National Licenses)
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