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Novel internal measurements of ion cyclotron frequency range fast-ion driven modes

POSTER

Abstract

Novel internal measurements and analysis of ion cyclotron frequency range fast-ion driven modes in DIII-D are presented. Observations, including internal density fluctuation ($\tilde_{n}$) measurements obtained via Doppler Backscattering, are presented for modes at low harmonics of localized in the edge. The measurements indicate that these waves, identified as coherent Ion Cyclotron Emission (ICE), have high wave number, consistent with the cyclotron harmonic wave branch of the magnetoacoustic cyclotron instability (MCI), excited by Doppler-shifted cyclotron resonance (DCR) with fast ions, or electrostatic instability mechanisms. Measurements show extended spatial structure (up to ~ 1/6 the minor radius). These edge ICE modes undergo amplitude modulation correlated with edge localized modes (ELM) that is qualitatively consistent with expectations for ELM-induced fast-ion transport.

Presenters

  • Neal A Crocker

    UCLA, University of California, Los Angeles

Authors

  • Neal A Crocker

    UCLA, University of California, Los Angeles

  • Kathreen E Thome

    General Atomics - San Diego, General Atomics

  • Amani Zalzali

    Univ of Warwick

  • Richard Dendy

    EURATOM/CCFE

  • William A Peebles

    University of California, Los Angeles

  • Kshitish Kumar Barada

    University of California, Los Angeles

  • Rongjie Hong

    Oak Ridge Assoc Univ, UCLA, University of California, Los Angeles

  • Terry L Rhodes

    University of California, Los Angeles

  • Guiding Wang

    University of California, Los Angeles

  • Lei Zeng

    UCLA, University of California, Los Angeles, University of California Los Angeles

  • Genevieve H DeGrandchamp

    University of Califronia, Irvine, UCI, University of California, Irvine

  • William W Heidbrink

    University of California, Irvine