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  • Articles: DFG German National Licenses  (3)
  • 1985-1989  (3)
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  • Articles: DFG German National Licenses  (3)
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    A high magnetic Reynolds number dynamo (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 1079-1084 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A boundary-layer solution to a high magnetic Reynolds number R periodic dynamo model shows that: (1) flux expulsion forces the magnetic field into flux sheets; (2) the principal contribution to the α effect arises from regions of flow stagnation along a flux sheet; and (3) the α effect scales as R−1/2. Arguments for these effects persisting in turbulent dynamos are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866304
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the Murakami density limit in tokamaks and reversed-field pinches (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1837-1844 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical upper limit for the density in an Ohmically heated tokamak discharge follows from the requirement that the Ohmic heating power deposited in the current-carrying channel exceed the impurity radiative cooling in this critical region. A compact summary of our results gives this limit nM for the central density as nM =[Ze/(Ze−1)]1/2 ne0 (BT /1T) (1m/R), where ne0 depends strongly on the impurity species and is remarkably independent of the central electron temperature Te(0). For Te(0) ∼1 keV, ne0 =1.5×1014 cm−3 for beryllium, ne0 =5.5×1013 cm−3 for oxygen, ne0 =1.0×1013 cm−3 for iron and, ne0 =0.5×1013 cm−3 for tungsten. The results agree quantitatively with Murakami's original observations. A similar density limit, known as the I/N limit, exists for reversed-field pinch devices and this limit has also been evaluated for a variety of impurity species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864927
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Parabolic approximation method for fast magnetosonic wave propagation in tokamaks (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1608-1619 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fast magnetosonic wave propagation in a cylindrical tokamak model is studied using a parabolic approximation method in which poloidal variations of the wave field are considered weak in comparison to the radial variations. Diffraction and wave interference effects, which are ignored by ray tracing methods, are included self-consistently using the parabolic method since continuous solutions for the wave electromagnetic fields are computed directly from an approximate form of the wave equation. Numerical results are presented which illustrate the cylindrical convergence of the launched waves into a diffraction-limited focal spot on the cyclotron absorption layer near the magnetic axis for a wide range of plasma confinement parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865677
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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