Coupling of the JET ICRF antennas in ELMy H-mode plasmas with ITER relevant plasma - Straps distance

M. L. Mayoral, I. Monakhov, P. Jacquet, M. De Baar, M. Brix, M. Graham, K. Erents, J. Hobirk, A. Korotkov, P. Lomas, J. Mailloux, D. C. McDonald, J. Ongena, M. Stamp, A. Walden

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

Abstract

In ITER, the requirement for the ICRF antenna is to deliver 20 MW in ELMy H-mode plasmas with an averaged antenna - plasma separatrix distance of 14 cm [1]. Two major problems will have to be solved: the very fast change in antenna loading during ELMs and the decrease of the loading when the plasma is pushed far away from the antenna. JET has the capability to combine these conditions and for the first time, experiments were performed in ELMy H-mode at antenna - separatrix distance, referred as ROG, varied from 10 to 14 cm. When ROG was increased, the perturbation caused by ELMs was found to decrease significantly and the loading between ELMs was found to deteriorate to very low values. In order to compensate the latter unwanted effect, different levels of deuterium gas were injected in the edge either from the divertor, the midplane or the top of the tokamak. Using this technique, the loading was increased by up to a factor 6 and up to 8 MW of ICRF power were coupled.

Original languageEnglish
Title of host publicationRADIO FREQUENCY POWER IN PLASMAS
Subtitle of host publication17th Topical Conference on Radio Frequency Power in Plasmas
Pages55-58
Number of pages4
DOIs
Publication statusPublished - 2007
Event17th Topical Conference on Radio Frequency Power in Plasmas - Clearwater, FL, United States
Duration: 7 May 20079 May 2007

Publication series

NameAIP Conference Proceedings
Volume933
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference17th Topical Conference on Radio Frequency Power in Plasmas
Country/TerritoryUnited States
CityClearwater, FL
Period7/05/079/05/07

Keywords

  • Coupling
  • ICRF antenna

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