title: Evidence for fast-ion transport by microturbulence.
abstract: Cross-field diffusion of energetic ions by microturbulence is measured during neutral-beam injection into the DIII-D tokamak. Fast-ion D(alpha), neutron, and motional Stark effect measurements diagnose the fast-ion distribution function. As expected for transport by plasma turbulence, anomalies relative to the classical prediction are greatest in high temperature plasmas, at low fast-ion energy, and at larger minor radius. Theoretical estimates of fast-ion diffusion are comparable to experimental levels.
authors.affiliation: University of California, Irvine, CA 92697, USA.
authors.forename: W W
authors.initials: WW
authors.lastname: Heidbrink
authors.forename: J M
authors.initials: JM
authors.lastname: Park
authors.forename: M
authors.initials: M
authors.lastname: Murakami
authors.forename: C C
authors.initials: CC
authors.lastname: Petty
authors.forename: C
authors.initials: C
authors.lastname: Holcomb
authors.forename: M A
authors.initials: MA
authors.lastname: Van Zeeland