Strong Turbulence in Low-beta Plasmas

C. M. Tchen, Hans Pécseli, Søren Ejling Larsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    An investigation of the spectral structure of turbulence in a plasma confined by a strong homogeneous magnetic field was made by means of a fluid description. The turbulent spectrum is divided into subranges. Mean gradients of velocity and density excite turbulent motions, and govern the production subrange. The spectra of velocity and potential fluctuations interact in the coupling subrange, and the energy is transferred along the spectrum in the inertia subrange. Applying the method of cascade decomposition, the spectral laws k-3, k-3, k-2 are obtained for the velocity fluctuations, and k-3, k-5, k-3/2 for the potential fluctuations in the production, coupling and inertia subranges, respectively. The coefficient of Bohm diffusion is reproduced, and its role in electrostatic coupling is derived. Comparison is made with measured power laws reported in the literature, from Q-devices, hot-cathode reflex arc, Stellarator, Zeta discharge, ionospheric plasmas, and auroral plasma turbulence.
    Original languageEnglish
    JournalPlasma Physics and Controlled Fusion
    Volume22
    Issue number8
    Pages (from-to)817-829
    ISSN0741-3335
    DOIs
    Publication statusPublished - 1980

    Cite this