Skip to main content
eScholarship
Open Access Publications from the University of California

Scrape-off layer ion acceleration during fast wave injection in the DIII-D tokamak

  • Author(s): Pace, DC
  • Pinsker, RI
  • Heidbrink, WW
  • Fisher, RK
  • Van Zeeland, MA
  • Austin, ME
  • McKee, GR
  • García-Muñoz, M
  • et al.
Abstract

Fast wave injection is employed on the DIII-D tokamak as a current drive and electron heating method. Bursts of energetic ions with energy Eo>20keV are observed immediately following fast wave injection in experiments featuring the 8th ion cyclotron harmonic near the antenna. Using the energy and pitch angle of the energetic ion burst as measured by a fast-ion loss detector, it is possible to trace the origin of these ions to a particular antenna. The ion trajectories exist entirely within the scrape-off layer. These observations are consistent with the presence of parametric decay instabilities near the antenna strap. It is suggested that the phase space capabilities of the loss detector diagnostic can improve studies of wave injection coupling and efficiency in tokamaks by directly measuring the effects of parametric decay thresholds. © 2012 IAEA, Vienna.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View