IAEA Fusion Energy Conference 2010Proceedings of the 23rd IAEA Fusion Energy ConferenceDaejeon, 11-16 October 2010 Organized by the
International Atomic Energy Agency IAEA-CN-180 (ITR/P1-11) On Maximizing the ICRF Antenna Loading for ITER PlasmasM.L. Mayoral1), V. Bobkov2), L. Colas3), M. Goniche3), J. Hosea4), J.G. Kwak5), R. Pinsker6), S. Moriyama7), S. Wukitch8), F.W. Baity9), S. Carpentier-Chouchana12), A. Czarnecka10), A. Ekedahl3), G. Hanson9), P. Jacquet1), P. Lamalle12), I. Monakhov1), M. Murakami9), A. Nagy4), M. Nightingale1), J.M. Noterdaeme2, 13), J. Ongena11), P.M. Ryan9), M. Vrancken11), J.R. Wilson4), JET-EFDA Contributors*, ASDEX Upgrade Team and the ITPA “Integrated Operations Scenarios” Topical Group Members and Experts1) Euratom/CCFE Association, Culham Science Centre, Abingdon, Oxon, OX143DB, UK 2) Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching, Germany 3) Association Euratom-CEA, CEA/DSM/IRFM, F-13108 St Paul lez Durance, France 4) Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA 5) Korea Atomic Energy Research Institute, Yuseong, Daejeon 350-600, Republic of Korea 6) General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA 7) Japan Atomic Energy Agency, 801-1, Mukouyama, Naka, Ibaraki-ken 311-0193, Japan 8) MIT Plasma Science and Fusion Center, Cambridge, MA02139, USA 9) Oak Ridge National Laboratory, Oak Ridge, TN, USA 10) Association Euratom-IPPLM, Hery 23, 01-497 Warsaw, Poland 11) Association “EURATOM - Belgian State”, ERM-KMS, TEC partners, Brussels, Belgium 12) ITER Organization, F-13067, St. Paul lez Durance Cedex, France 13) EESA Department, UGent, Gent, Belgium * See Appendix of F. Romanelli et al., Nucl. Fusion 49 (2009) 104006.
Abstract. For any given ICRF antenna design for ITER,
the maximum achievable power strongly depends on the density profiles
in the SOL. It has been suggested that gas injection can be used to
modify the SOL profiles and thus minimize the sensitivity of the ICRF
coupling to variations in the density at the edge of the confined
plasma. Recently joint experiments coordinated by the ITPA were
performed to characterise further this method. An increase in SOL
density during gas injection led to improved coupling for all tokamaks
in this multi-machine comparison. The effectiveness of using gas
injection over a wide range of conditions, as a tool to tailor the
edge density in front of the ICRF antennas, is documented for
different gas inlet location and plasma configurations. In addition,
any deleterious effects on the confinement and interaction with the
antenna near-field are investigated.
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