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  • 1985-1989  (3)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear self-sustainment of magnetic islands (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 977-979 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A mechanism is proposed for a nonlinear self-sustainment of magnetic islands that relies on the presence of a chaotic region. Particles diffusing in the stochastic magnetic field produce a local increase of current at X points on a rational surface, which in turn sustains the original perturbation if the equilibrium profile is concave. It is shown that the new equilibrium is stable. In a tokamak the mechanism is operative in the region outside the q=2 surface, in agreement with the observation of strong electron confinement degradation in this region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858985
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Alpha particle confinement in tokamaks (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 980-982 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An assessment of diffusive tokamak transport mechanisms of concern for alpha particles indicates that the "stochastic regime'' is the only one that appears to pose a real danger for adequate alpha confinement. This fact, in conjunction with the threshold character of that mechanism, allows one to decide whether an alpha born at a given location will be lost or confined, according to a very simple criterion. Implementing this criterion numerically results in a new code for the assessment of alpha confinement, which is orders of magnitude faster than earlier codes used for this purpose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858986
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Trapped particle destabilization of the internal kink mode (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 278-286 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The internal kink mode is destabilized by trapped high-energy particles, leading to a new branch of the internal kink dispersion relation with a real frequency near the average trapped-particle precession frequency and a growth rate of the same magnitude. This trapped particle branch of the dispersion relation is investigated numerically for a variety of particle distributions. Mode growth rate and frequency is found as a function of plasma β, density, and trapped-particle energy and distribution. The high-energy trapped particle sources considered are neutral beam injection, ion-cyclotron heating, and fusion alpha particles. Relevance for various plasma heating schemes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865198
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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