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Giroud, C.*; Jachmich, S.*; Jacquet, P.*; J
rvinen, A.*; Lerche, E.*; Rimini, F.*; Aho-Mantila, L.*; Aiba, Nobuyuki; Balboa, I.*; Belo, P.*; et al.
Plasma Physics and Controlled Fusion, 57(3), p.035004_1 - 035004_20, 2015/03
Times Cited Count：64 Percentile：95.98(Physics, Fluids & Plasmas)This paper reports the progress made at JET-ILW on integrating the requirements of the reference ITER baseline scenario with normalized confinement factor of 1, at a normalized pressure of 1.8 together with partially detached divertor whilst maintaining these conditions over many energy confinement times. The 2.5 MA high triangularity ELMy H-modes are studied with two different divertor configurations with D-gas injection and nitrogen seeding. The power load reduction with N seeding is reported. The relationship between an increase in energy confinement and pedestal pressure with triangularity is investigated. The operational space of both plasma configurations is studied together with the ELM energy losses and stability of the pedestal of unseeded and seeded plasmas.
Peeters, A. G.*; Angioni, C.*; Bortolon, A.*; Camenen, Y.*; Casson, F. J.*; Duval, B.*; Fiederspiel, L.*; Hornsby, W. A.*; Idomura, Yasuhiro; Hein, T.*; et al.
Nuclear Fusion, 51(9), p.094027_1 - 094027_13, 2011/09
Times Cited Count：102 Percentile：97.23(Physics, Fluids & Plasmas)Litaudon, X.*; Sakamoto, Yoshiteru; de Vries, P. C.*; Salmi, A.*; Tala, T.*; Angioni, C.*; Benkadda, S.*; Beurskens, M. N. A.*; Bourdelle, C.*; Brix, M.*; et al.
Nuclear Fusion, 51(7), p.073020_1 - 073020_13, 2011/07
Times Cited Count：8 Percentile：34.5(Physics, Fluids & Plasmas)A variety of triggering mechanisms and structures of internal transport barrier (ITB) has been observed in various devices or depending on operation scenarios. Thus identity experiments on ITB in JT-60U and JET have been performed to shed light on the physics behind ITBs. Because of their similar size, the dimensionless parameters between both devices are the same. These experiments were performed with near identical magnetic configurations, heating waveforms and normalized quantities such as safety factor, magnetic shear, normalized Larmor radius, normalized collision frequency, beta, temperatures ratio. Similarities of the ITB triggering mechanism and the ITB strength have been observed when a proper match is achieved of the most relevant profiles of the normalized quantities. This paper will report on the detail comparison of transport properties of ITBs obtained in these JET/JT-60U identity experiments.
Peeters, A. G.*; Angioni, C.*; Bortolon, A.*; Camenen, Y.*; Casson, F. J.*; Dubal, B.*; Fiederspiel, L.*; Hornsby, W. A.*; Idomura, Yasuhiro; Kluy, N.*; et al.
Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 13 Pages, 2011/03
Angioni, C.*; Fable, E.*; Greenwald, M.*; Maslov, M.*; Peeters, A. G.*; Takenaga, Hidenobu; Weisen, H.*
Plasma Physics and Controlled Fusion, 51(12), p.124017_1 - 124017_14, 2009/12
Times Cited Count：139 Percentile：97.8(Physics, Fluids & Plasmas)The physical processes producing electron particle transport in the core of tokamak plasmas are described. Starting from the gyrokinetic equation, a simple analytical derivation is used as guidance to illustrate the main mechanisms driving turbulent particle convection. A review of the experimental observations on particle transport in tokamaks is presented and the consistency with the theoretical predictions is discussed. An overall qualitative agreement, and in some cases even a specific quantitative agreement, emerges between complex theoretical predictions and equally complex experimental observations, exhibiting different dependences on plasma parameters under different regimes. By these results, the direct connection between macroscopic transport properties and the character of microscopic turbulence is pointed out, and an important confirmation of the paradigma of microinstabilities and turbulence as the main cause of transport in the core of tokamaks is obtained. Finally, the impact of these results on the prediction of the peaking of the electron density profile in a fusion reactor is illustrated.
Angioni, C.*; Weisen, H.*; Zabolotsky, A.*; Ryter, F.*; Takenaga, Hidenobu
no journal, ,
In order to contribute to the consideration that He plasmas will be used for the initial operation phase in ITER, density profiles are investigated in He plasmas on multi machines such as TCV, JET, AUG and JT-60U. He edge neutrals penetrate much less than H edge neutrals, because ratio CX to ionization rate coefficients is about one order of magnitude smaller in He. Despite of this, no significative difference in the density profiles is observed between pairs of similar D and He plasmas in TCV, JET, AUG, and JT-60U, in both L- and H-mode. This result provides further confirmation that neutral penetration (particle source/NBI fuelling) is not the main ingredient leading to peaked density profiles. AUG and JET He plasmas in H-mode have been included in the AUG/JET/C-Mod density peaking database. The subset of He plasmas exhibits the same collisionality dependence as the D plasmas, although there are no enough data to perform statistics though.
