Impact of localized gas injection on ICRF coupling and SOL parameters in JET-ILW H-mode plasmas

0447361 - ÚFP 2016 RIV NL eng J - Journal Article
Lerche, E. - Goniche, M. - Jacquet, P. - Van Eester, D. - Bobkov, V. - Colas, L. - Czarnecka, A. - Brezinsek, S. - Brix, M. - Crombe, K. - Graham, M. - Groth, M. - Monakhov, I. - Mathurin, T. - Matthews, G. - Meneses, L. - Noble, C. - Petržílka, Václav - Rimini, F. - Shaw, A.
Impact of localized gas injection on ICRF coupling and SOL parameters in JET-ILW H-mode plasmas.
Journal of Nuclear Materials. Roč. 463, August (2015), s. 634-639. ISSN 0022-3115. E-ISSN 1873-4820.
[PLASMA-SURFACE INTERACTIONS 21: International Conference on Plasma-Surface Interactions in Controlled Fusion Devices. Kanazawa, 26.05.2014-30.05.2014]
Institutional support: RVO:61389021
Keywords : Ion cyclotron * gas injection
OECD category: Nuclear related engineering
Impact factor: 2.199, year: 2015
http://dx.doi.org/10.1016/j.jnucmat.2014.10.074

By fuelling the plasma from gas injection modules (GIMs) located in the mid-plane and on the top of the machine instead of adopting the more standardly used divertor GIMs, a considerable increase of the ICRF antenna coupling resistances was achieved with moderate gas injection rates. This effect is explained by an increase of the scrape-off-layer density in front of the antennas when mid-plane and top fuelling is used, making the evanescence region of the launched fast wave shorter. By distributing the gas injection to optimize the coupling of all ICRF antenna arrays simultaneously, a substantial increase in the ICRF power capability and reliability was attained..
Permanent Link: http://hdl.handle.net/11104/0249225