Species mix and distribution function dependence of instabilities near ωci

POSTER

Abstract

The instabilities known as compressional Alfven eigenmodes (CAE) and ion cyclotron emission (ICE) in tokamaks resemble the electromagnetic ion cyclotron (EMIC) and “equatorial noise” instabilities in the Van Allen radiation belts. In this Frontier Science experiment, the dependence of CAE and ICE on the hydrogen, deuterium and 3He concentration was measured for ten different fast-ion distributions created by changing the neutral beam parameters: hydrogen/deuterium, co-current/counter-current, tangential/perpendicular, and on-axis/off-axis. Below ωci, CAE modes are more unstable at 1.25 T than at 2.1 T and the amplitude increases with increasing hydrogen concentration. Above ωci, the ICE is stronger at 2.1 T and hydrogen has little effect.

Presenters

  • Genevieve H DeGrandchamp

    Univ of California - Irvine

Authors

  • Genevieve H DeGrandchamp

    Univ of California - Irvine

  • William Walter Heidbrink

    Univ of California - Irvine, University of California, Irvine

  • Xiaodi D Du

    University of California, Irvine, Irvine, CA, USA, Univ of California - Irvine

  • Kathreen Thome

    General Atomics - San Diego

  • Laszlo Bardoczi

    General Atomics - San Diego, General Atomics - San Diego, Oak Ridge Associated Universities

  • Michael A Van Zeeland

    General Atomics - San Diego, General Atomics, GA

  • Cami S Collins

    General Atomics - San Diego

  • Stephen T Vincena

    Univ of California - Los Angeles, University of California, Los Angeles

  • Shawn X Tang

    Univ of California - Los Angeles, University of California, Los Angeles

  • N A Crocker

    UCLA, Univ of California - Los Angeles, University of California, Los Angeles, University of California Los Angeles, University of California Los Angeles

  • Sergei Sharapov

    Culham Centre for Fusion Energy

  • Mark E Koepke

    West Virginia Univ, West Virginia University, University of Strathclyde, WVU

  • S H Nogami

    West Virginia Univ, WVU

  • Shreekrishna Tripathi

    Univ of California - Los Angeles