Characterization of electron Bernstein wave emission from the TJ-II stellarator

J. B.O. Caughman, Á Cappa, J. M. Garcia-Regaña, F. Castejón, Á Fernández, D. A. Rasmussen, J. B. Wilgen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Thermal electron emission at 28 GHz has been measured on the TJ-II Stellarator. The microwave emission from over-dense neutral beam heated plasmas, where the plasma density is greater than the ordinary-mode (O-mode) cutoff density (>1.2×1019m-3), is consistent with electron thermal emission from mode-converted electron Bernstein waves (EBW) via the Bernstein wave to extraordinary mode to ordinary mode scenario (B-X-O). Electron Bernstein wave emission (EBE) measurements are being made to determine the optimum launch angle for planned EBW heating experiments and also to provide an indication of electron temperature evolution in over-dense plasma. A movable focusing mirror located inside the vacuum vessel is used to measure the emission as a function of viewing angle, and measurements are compared with ray-tracing calculations using the TRUBAcode[1].

Original languageEnglish
Title of host publicationRadio Frequency Power in plasmas - Proceedings of the 18th Topical Conference
Pages461-464
Number of pages4
DOIs
StatePublished - 2009
Event18th Topical Conference on Radio Frequency Power in plasmas - Gent, Belgium
Duration: Jun 24 2009Jun 26 2009

Publication series

NameAIP Conference Proceedings
Volume1187
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference18th Topical Conference on Radio Frequency Power in plasmas
Country/TerritoryBelgium
CityGent
Period06/24/0906/26/09

Keywords

  • Electron Bernstein waves
  • Stellarator
  • TJ-II

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