Measurements of spatial line emission profiles in the main scrape-off layer of the DIII-D tokamak

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • M. Groth
  • R. M. Ellis
  • N. H. Brooks
  • M. E. Fenstermacher
  • C. J. Lasnier
  • W. H. Meyer
  • J. M. Moeller

Research units

  • Lawrence Livermore National Laboratory
  • General Atomics

Abstract

A video camera system is described as that measures the spatial distribution of visible line emission emitted from the main scrape-off layer (SOL) of plasmas in the DIII-D tokamak. A wide-angle lens installed on an equatorial port and an in-vessel mirror, which intercepts part of the lens' view, provide simultaneous tangential views of the SOL on the low-field and high-field sides of the plasma's equatorial plane. Tomographic reconstruction techniques are used to calculate the two-dimensional (2D) poloidal profiles from the raw data, and one-dimensional (1D) poloidal profiles simulating chordal views of other optical diagnostics from the 2D profiles. The 2D profiles can be compared with SOL plasma simulations; the 1D profiles with measurements from spectroscopic diagnostics. Sample results are presented, which elucidate carbon transport in plasmas with toroidally uniform injection of methane and argon transport in disruption mitigation experiments with massive gas jet injection.

Details

Original languageEnglish
Article number033505
Pages (from-to)1-9
Number of pages9
JournalReview of Scientific Instruments
Volume80
Issue number3
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

ID: 4089916