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

UC Irvine

UC Irvine Previously Published Works bannerUC Irvine

Anomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity.

  • Author(s): Heidbrink, WW
  • Gorelenkov, NN
  • Luo, Y
  • Van Zeeland, MA
  • White, RB
  • Austin, ME
  • Burrell, KH
  • Kramer, GJ
  • Makowski, MA
  • McKee, GR
  • Nazikian, R
  • DIII-D team
  • et al.
Abstract

Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application of fast-ion D_{alpha} (FIDA) spectroscopy to Alfvén-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The current density driven by fast ions is also strongly modified. Calculations based on the measured mode amplitudes do not explain the observed fast-ion transport.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View