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Title: Probing the plasma near high power wave launchers in fusion devices for static and dynamic electric fields

An exploratory study was carried out in the long-pulse tokamak Tore Supra, to determine if electric fields in the plasma around high-power, RF wave launchers could be measured with non-intrusive, passive, optical emission spectroscopy. The focus was in particular on the use of the external electric field Stark effect. The feasibility was found to be strongly dependent on the spatial extent of the electric fields and overlap between regions of strong (> 1 kV/cm) electric fields and regions of plasma particle recycling and plasma-induced, spectral line emission. Most amenable to the measurement was the RF electric field in edge plasma, in front of a lower hybrid heating and current drive launcher. Electric field strengths and direction, derived from fitting the acquired spectra to a model including time-dependent Stark effect and the tokamak-range magnetic field Zeeman-effect, were found to be in good agreement with full-wave modeling of the observed launcher.
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [2] ;  [3] ;  [1] ;  [4] ;  [3] ;  [1] ;  [1] ;  [1] ;  [5] ;  [6]
  1. ORNL
  2. French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance
  3. French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)
  4. Oak Ridge National Laboratory (ORNL)
  5. North Carolina State University
  6. French Atomic Energy Commission (CEA)
Publication Date:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Reviews of Scientific Instruments; Journal Volume: 85; Journal Issue: 11
Research Org:
Oak Ridge National Laboratory (ORNL)
Sponsoring Org:
SC USDOE - Office of Science (SC)
Country of Publication:
United States