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  • 1990-1994  (3)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    A global dynamo in a reversed-field pinch plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2876-2881 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is found that a reversed-field pinch (RFP) dynamo uniformly generates most of the toroidal flux in a RFP plasma with a high magnetic Reynolds (S) number. Hereafter, this is referred to as the global dynamo. The toroidal flux generated by the global dynamo is proportional to the plasma current. The effective inductance in a RFP plasma increases with S number and remains constant against the changing plasma current. This means that the pinch parameter aitch-theta is held constant, that is, the global dynamo has a self-organizing effect sustaining a particular RFP configuration. By comparing simulation results and analysis of magnetic fluctuations, it is confirmed that a global dynamo is generated by the nonlinear evolution of the single-helicity of the m=1 mode alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870527
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Macroscopic behavior and discrete dynamo in high-aitch-theta reversed-field pinch discharges (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1836-1841 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetohydrodynamic (MHD) activity and the discrete dynamo in high-aitch-theta reversed-field pinch (RFP) discharges are studied through comparisons with those in normal-aitch-theta RFP discharges, where aitch-theta=Bθ(a)/〈Bz〉 is the pinch parameter. In high-aitch-theta RFP discharges, the mode coupling of m=1 is enhanced by the high magnetic shear configuration, and the MHD activity is more turbulent as compared with that in normal-aitch-theta RFP discharges. Furthermore, the discrete increase of the toroidal magnetic flux is obviously observable. The increase of the toroidal magnetic flux generated by the discrete dynamo, which has an asymmetric structure in the toroidal direction, is only 1%–2% of the whole toroidal magnetic flux. The experimental results indicate that the discrete dynamo does not play an essential role in the RFP dynamo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860820
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Simulation study of the dynamo structure in the reversed-field pinch (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1263-1269 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamo structure in the reversed-field pinch (RFP) is studied through the nonlinear dynamics of a single-helicity mode. Simulation is concentrated upon the physical structure of nonlinear interactions of the plasma flow and magnetic fluctuation. The result indicates that when the initial equilibrium profile is deformed by resistive diffusion, the radial flow is driven near the core of the plasma. As this flow forms a vortex structure and magnetic fluctuation grows radially, the dynamo electric field is helically induced just inside the reversal surface and then the toroidal flux is increased. This dynamo electric field correlates to the nonlinear evolution of the kinetic energy of the m=1 mode, and the increase of the toroidal flux originates in the growth process of the magnetic energy of this mode. Consequently, the RFP configuration can be sustained by the single-helicity evolution of the m=1 mode alone, and the electric field induced by the interactions of the toroidal velocity and the radial magnetic field is the most dominant source on the dynamo action.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860916
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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