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Abstract

The improvement of LH coupling with local puffing of D(2) gas, which made operation at ITER relevant distances (10 cm) and with ELMs a reality, has been extended to ITER- like plasma shapes with higher triangularity. With ICRF, we developed tools such as (1) localized direct electron heating using the {3}He mode conversion scenario for electron heat transport studies, (2) the production of {4}He ions with energies in the MeV range by 3 omega(c) acceleration of beam injected ions at 120 keV to investigate Alfven instabilities and test alpha ?diagnostics, (3) the stabilisation and destabilisation of sawteeth and (4) ICRF as a wall conditioning. Several ITER relevant scenarios were tested. The ({3}He)H minority heating scenario, considered for the nonactivated start-up phase of ITER, produces at very low concentration energetic {3}He which heat the electrons indirectly. For n(3He)/n(e) > 2%, the scenario transforms to a mode conversion scenario where the electrons are heated directly. The (D)H minority heating is not accessible as the concentration of C6+ dominates the wave propagation and always leads to mode conversion. The minority heating of T in D is very effective heating for ions and producing neutrons. New results were obtained in several areas of ICRF physics. Experimental evidence confirmed the theoretical prediction that, as the larmor radius increases beyond 0.5 times the perpendicular wavelength of the wave, the second harmonic acceleration of the ions decreases to very small levels. An exotic fusion reaction (pT) must be taken into account when evaluating neutron rates. The contribution of fast particles accelerated by ICRF to the plasma rotation was clearly identified, but it is only part of an underlying, and not yet understood, co-current plasma rotation. Progress was made in the physics of ELMs while their effect on the ICRF coupling could be minimized with the conjugate-T matching scheme.

Additional information

Authors: MANTSINEN M, Gent University, EESA Department, Gent (BE);SALMI A, Gent University, EESA Department, Gent (BE);SANTALA M, Gent University, EESA Department, Gent (BE);RANTAMAKI K, Gent University, EESA Department, Gent (BE);EKEDAHL A, Association EURATOM-TEKES, Helsinki University of Technology (FI);ERIKSSON L-G, Association EURATOM-TEKES, Helsinki University of Technology (FI);MAILLOUX J, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);MAYORAL M-L, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);MONAKHOV I, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);SHARAPOV S, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);MEO F, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);NOTERDAEME J-M, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);BOBKOV V, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);LAMALLE P U, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LYSSOIVAN A, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);VAN EESTER D, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at: Sixteenth Topical Conference on Radio Frequency Power in Plasmas Organised by: Plasma Science & Fusion Center, Cambridge (US) Held at: Park City, Utah USA
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
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