RF sheath-enhanced beryllium sources at JET's ICRH antennas

C. C. Klepper, P. Jacquet, V. Bobkov, L. Colas, T. M. Biewer, D. Borodin, A. Czarnecka, C. Giroud, E. Lerche, V. Martin, M. L. Mayoral, F. Rimini, G. Sergienko, D. Van Eester

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Local beryllium (Be) I and Be II line intensities were measured in the plasma-wall interaction region near an ICRH antenna in JET. The intent was to use these intensities as a measure of the formation of local Radio Frequency (RF) sheath potentials, through RF sheath rectification and potential build up at the end of field lines passing in front of the antenna. Experimentally, it was found that the Be I and Be II emission increase when using the antenna local to the spectroscopic measurement, and increase even more when using a remote antenna that is magnetically connected to the observation point. Magnetic field mapping indicates a magnetic connection between the observation location and the top corner region of the remote antenna and/or its protection limiter. These measurements can be used in support of RF sheath modeling that is an important part of the optimization of antenna design for next generation fusion energy devices, including ITER.

Original languageEnglish
Pages (from-to)S594-S598
JournalJournal of Nuclear Materials
Volume438
Issue numberSUPPL
DOIs
StatePublished - 2013
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the US DOE under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. This work was also supported by EURATOM and carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funding

This work was supported by the US DOE under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. This work was also supported by EURATOM and carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

FundersFunder number
U.S. Department of Energy
H2020 Euratom
Engineering and Physical Sciences Research CouncilEP/I501045/1

    Fingerprint

    Dive into the research topics of 'RF sheath-enhanced beryllium sources at JET's ICRH antennas'. Together they form a unique fingerprint.

    Cite this