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Turbulence Suppression by Energetic Particle Effects in Modern Optimized Stellarators

A. Di Siena1,2,*,†, A. Bañón Navarro2,*,‡, and F. Jenko2,§

  • 1The University of Texas at Austin, 201 East 24th Street, Austin, Texas 78712, USA
  • 2Max Planck Institute for Plasma Physics, Boltzmannstrasse 2, 85748 Garching, Germany

  • *These authors contributed equally to this work.
  • †alessandro.disiena@austin.utexas.edu
  • ‡alejandro.banon.navarro@ipp.mpg.de
  • §frank.jenko@ipp.mpg.de
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Phys. Rev. Lett. 125, 105002 – Published 3 September, 2020

DOI: https://doi.org/10.1103/PhysRevLett.125.105002

Abstract

Turbulent transport is known to limit the plasma confinement of present-day optimized stellarators. To address this issue, a novel method to strongly suppress turbulence in such devices is proposed, namely the resonant wave-particle interaction of suprathermal particles—e.g., from ion-cyclotron-resonance-frequency heating—with turbulence-driving microinstabilities like ion-temperature-gradient modes. The effectiveness of this mechanism is demonstrated via large-scale gyrokinetic simulations, revealing an overall turbulence reduction by up to 65% in the case under consideration. Comparisons with a tokamak configuration highlight the critical role played by the magnetic geometry and the first steps into the optimization of fast particle effects in stellarator devices are discussed. These results hold the promise of new and still unexplored stellarator scenarios with reduced turbulent transport, essential for achieving burning plasmas in future devices.

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Information

Phys. Rev. Lett. 125, 105002– Published 3 September, 2020
  • Received 29 February 2020
  • Revised 17 July 2020
  • Accepted 30 July 2020
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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