LH power losses in front of the JET launcher

P. Jacquet, G. Arnoux, L. Colas, L. Delpech, A. Ekedahl, D. Frigione, M. Goniche, K. Kirov, F. Leguen, J. Mailloux, M. L. Mayoral, J. Ongena, V. Petrzilka, C. Portafaix, F. Rimini

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

Abstract

In recent JET experiments, Lower Hybrid (LH) power losses in the Scrape-Off Layer (SOL) were characterized using infra-red (IR) thermography. Hot spots were observed on objects intercepting the field lines passing in front of the LH launcher, i.e. on poloidal limiters and on dumplates located at the top of the tokamak; their locations being in good agreement with magnetic field line tracing using the EFIT equilibrium code. The dumplate temperature was monitored while scanning the launcher position so that the radial distance between field lines intercepting the hot spots and the launcher was increased up to 3.5 cm. The dissipation layer in front of the launcher was estimated to be at least 3.5 cm wide, in agreement with recent measurements on Tore-Supra, but not with simple models that predict a dissipation layer in the mm range.

Original languageEnglish
Title of host publicationRadio Frequency Power in plasmas - Proceedings of the 18th Topical Conference
Pages399-402
Number of pages4
DOIs
Publication statusPublished - 2009
Event18th Topical Conference on Radio Frequency Power in plasmas - Gent, Belgium
Duration: 24 Jun 200926 Jun 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
Period24/06/0926/06/09

Keywords

  • Antenna
  • JET
  • Lower Hybrid waves
  • Tokamak

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