Effects of Resonant Magnetic Field Perturbations on Density Profiles, Particle Transport, and Turbulence in \hbox{DIII-D}

ORAL

Abstract

First direct measurements of an increase in particle diffusivities and reduction in pinch velocities in DIII-D plasmas with applied resonant magnetic field perturbations (RMP) is presented for both L- and \hbox{H-mode} plasmas. Modulated gas puff combined with high-resolution profile reflectometry techniques are used and the results confirm particle transport enhancement with RMP. In H-mode, turbulence levels (measured by Doppler backscattering and BES) increase substantially with high I-coil current ($>$ 4 kA) RMP, consistent with the observed changes in transport. Initial TGLF analysis indicates increased growth rates in this wavenumber range. Finally, observations that core density changes due to RMP can be minimized via adjusting I-coil current are presented.

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Authors

  • L. Zeng

    U. California-Los Angeles, UCLA

  • E.J. Doyle

    U. California-Los Angeles

  • T.L. Rhodes

    U. California-Los Angeles

  • L. Schmitz

    U. California-Los Angeles, University of California Los Angeles

  • W.A. Peebles

    UCLA, U. California-Los Angeles

  • T.E. Evans

    General Atomics, GA

  • S. Mordijck

    The College of William and Mary

  • R.A. Moyer

    UCSD, U. California-San Diego

  • G.R. McKee

    U. Wisc-Madison, University of Wisconsin-Madison, Madison, Wisconsin, USA, U. Wisconsin-Madison, U Wisc-Madison

  • Z. Yan

    U. Wisconsin-Madison, U Wisc-Madison, U. Wisc-Madison