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

Design of a D-alpha beam-ion profile diagnostic

  • Author(s): Luo, Y
  • Heidbrink, WW
  • Burrell, KH
  • et al.

Published Web Location

https://doi.org/10.1063/1.1784533Creative Commons Attribution 4.0 International Public License
Abstract

Injected neutral beams ionize to create a population of beam ions. As they orbit around the tokamak and pass through the heating beams, some beam ions re-neutralize and emit D-alpha light. The intensity of this emission is weak compared to the signals from the injected neutrals, the warm (halo) neutrals, and the edge recombination neutrals but, for a favorable viewing geometry, the emission is Doppler shifted away from these bright interfering signals. Preliminary data from the DIII-D tokamak show that signals from re-neutralized beam ions have already been detected. A three-channel prototype instrument consisting of a spectrometer, mask, camera lenses, and frame-transfer charge coupled device is under development for measurements of the spatial profile of the beam ions. © 2004 American Institute of Physics.

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