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.

*Work supported by U.S. DoE grants and contracts DE-FC02-04ER54698, DE-FG02-99ER54527, DE-SC0019352, and DE-SC0020337. Also, RCUK Energy Programme grant no. EP/T012250/1 and within framework of EUROfusion Consortium, with funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053.

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