Invariant Measure and Turbulent Pinch in Tokamaks

M. B. Isichenko, A. V. Gruzinov, P. H. Diamond

    Research output: Contribution to journalArticlepeer-review


    It is shown that electron transport due to a generic low-frequency electrostatic turbulence in tokamak geometry results in the relaxation to a peaked, self-sustained plasma density profile n0(r), rather than to a diffusion-induced flat distribution. The relaxed density profile depends on the magnetic geometry and the distribution of turbulence. The associated inward pinch velocity Vr=D lnn0 results from the competition of the turbulent diffusion of trapped electrons over the poloidal magnetic flux coordinate ψ and the collisional relaxation toward a Maxwellian distribution function.

    Original languageEnglish (US)
    Pages (from-to)4436-4439
    Number of pages4
    JournalPhysical Review Letters
    Issue number22
    StatePublished - 1995

    ASJC Scopus subject areas

    • General Physics and Astronomy


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