Coupling Of The JET ICRF Antennas In ELMy H-mode Plasmas With ITER Relevant Plasma-Straps Distance

Journal Article · Fri Sep 28 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2800548· OSTI ID:21035923

Mayoral, M -L; Monakhov, I; Jacquet, P; Brix, M; Graham, M; Erents, K; Korotkov, A; Lomas, P; Mailloux, J; McDonald, D C; Stamp, M; Walden, A ^[1]; Baar, M de ^[2]; Hobirk, J ^[3]; Ongena, J ^[4]

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1. UKAEA/Euratom Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB (United Kingdom)
2. EFDA Close Support Unit, Culham Science Centre, Abingdon, Oxon, OX14 3DB (United Kingdom)
3. Max-Planck-Institut fuer Plasmaphysik, EURATOM-Assoziation, D-85748 Garching (Germany)
4. ERM-KMS, Association EURATOM-Belgian State, Brussels (Belgium)

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. 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.

• OSTI ID: 21035923
• Journal Information: AIP Conference Proceedings, Vol. 933, Issue 1; Conference: 17. topical conference on radio frequency power in plasmas, Clearwater, FL (United States), 7-9 May 2007; Other Information: DOI: 10.1063/1.2800548; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). JET EFDA Contributors; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
COUPLING
DEUTERIUM
DISTURBANCES
DIVERTORS
EDGE LOCALIZED MODES
H-MODE PLASMA CONFINEMENT
ICR HEATING
ION CYCLOTRON-RESONANCE
ITER TOKAMAK
JET TOKAMAK
LOADING
PLASMA
PLASMA JETS
RF SYSTEMS