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Evidence for fast-ion transport by microturbulence.

  • Author(s): Heidbrink, WW
  • Park, JM
  • Murakami, M
  • Petty, CC
  • Holcomb, C
  • Van Zeeland, MA
  • et al.

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.

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