Species mix and distribution function dependence of instabilities near ω<sub>ci</sub>

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.

*Work supported by US DOE DE-SC0018270 and DE-FC02-04ER54698.

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