Journal ArticleDOI
Disappearance of giant ELMs and appearance of minute grassy ELMs in JT-60U high-triangularity discharges
Yutaka Kamada,T. Oikawa,L.L. Lao,Tomonori Takizuka,T. Hatae,Akihiko Isayama,J Manickam,M. Okabayashi,T. Fukuda,K Tsuchiya +9 more
TLDR
In this article, the edge temperature and pressure in the grassy ELMy H-mode were investigated and the edge stability analysis showed that the edge plasma is accessing the second stability regime of the high n ballooning mode.Abstract:
In JT-60U H-mode plasmas, giant (type I) ELMs disappear and minute grassy ELMs appear when triangularity δ, edge safety factor q95 and βp are high enough. Complete suppression of giant ELMs was observed at δ0.45, q956 and βp1.6. At higher δ (0.54), giant ELMs can disappear at a lower q95 (~4.0). In the grassy ELMy H-mode, edge temperature and pressure can be higher than those in giant ELMy H-mode and a favourable confinement can be sustained without an increase of the impurity concentration. An edge stability analysis suggests that the edge plasma is accessing the second stability regime of the high n ballooning mode in the grassy ELMy discharges.read more
Citations
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Chapter 2: Plasma confinement and transport
E. J. Doyle,Wayne A Houlberg,Yutaka Kamada,V. S. Mukhovatov,T.H. Osborne,A. R. Polevoi,G. Bateman,J. W. Connor,J. G. Cordey,T. Fujita,Xavier Garbet,T. S. Hahm,L. D. Horton,A. E. Hubbard,F. Imbeaux,Frank Jenko,J. E. Kinsey,Yasuaki Kishimoto,J.X. Li,T. C. Luce,Y. R. Martin,M. Ossipenko,V.V. Parail,A. G. Peeters,T. L. Rhodes,J. E. Rice,C. M. Roach,V. A. Rozhansky,F. Ryter,G. Saibene,R. Sartori,A. C. C. Sips,J. A. Snipes,M. Sugihara,E. J. Synakowski,H. Takenaga,Tomonori Takizuka,K. Thomsen,M. R. Wade,H. R. Wilson,Itpa Confinement Database,Itpa Pedestal +41 more
TL;DR: The understanding and predictive capability of transport physics and plasma confinement is reviewed from the perspective of achieving reactor-scale burning plasmas in the ITER tokamak, for both core and edge plasma regions.
Journal ArticleDOI
Chapter 1: Overview and summary
M. Shimada,David Campbell,V. Mukhovatov,M. Fujiwara,N. Kirneva,K. Lackner,M. Nagami,V. D. Pustovitov,N. Uckan,J. Wesley,N. Asakura,A.E. Costley,A. J. H. Donne,E. J. Doyle,Ambrogio Fasoli,C. Gormezano,Y. Gribov,O. Gruber,T. C. Hender,W. Houlberg,S. Ide,Y. Kamada,A. Leonard,Bruce Lipschultz,A. Loarte,Kenro Miyamoto,T. H. Osborne,A. Polevoi,A. C. C. Sips +28 more
TL;DR: The progress in the ITER Physics Basis (PIPB) document as discussed by the authors is an update of the IPB, which was published in 1999 [1], and provides methodologies for projecting the performance of burning plasmas, developed largely through coordinated experimental, modelling and theoretical activities carried out on today's large tokamaks (ITER Physics R&D).
Journal ArticleDOI
Key ITER plasma edge and plasma–material interaction issues
G. Federici,Philip Andrew,P. Barabaschi,Jeffrey N. Brooks,R.P. Doerner,A. Geier,A. Herrmann,G. Janeschitz,K. Krieger,A. B. Kukushkin,A. Loarte,Rudolf Neu,G. Saibene,Michiya Shimada,G. Strohmayer,Masayoshi Sugihara +15 more
TL;DR: Some of the remaining crucial plasma edge physics and plasma-material interaction issues of the ITER tokamak are discussed in this paper, using either modelling or projections of experimental results from existing TOKAMAK operation or relevant laboratory simulations.
Journal ArticleDOI
Internal transport barriers in tokamak plasmas
TL;DR: In this article, internal transport barriers in tokamak plasmas are explored in order to improve confinement and stability beyond the reference scenario, used for the ITER extrapolation, and to achieve higher bootstrap current fractions as an essential part of non-inductive current drive.
Journal ArticleDOI
Assessment of erosion of the ITER divertor targets during type I ELMs
TL;DR: In this article, a preliminary assessment conducted to estimate the thermal response and erosion lifetime of the ITER divertor targets clad either with carbon-fibre composite or tungsten during type I ELMs is presented.
References
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Journal Article
Plasma Physics and Controlled Nuclear Fusion Research
TL;DR: In this paper, the first experiments in JET have been described, which show that this large tokamak behaves in a similar manner to smaller tokak, but with correspondingly improved plasma parameters.
Journal ArticleDOI
Equilibrium analysis of current profiles in tokamaks
TL;DR: In this paper, an efficient method is given for self-consistent reconstruction of the tokamak current profiles and their associated magnetic topology using the magnetohydrodynamic (MHD) equilibrium constraint from external magnetic measurements, kinetic profile measurements, internal poloidal magnetic field measurements, and topological information from soft X-ray (SXR) measurements.
Journal ArticleDOI
Edge-localized modes - physics and theory
TL;DR: The phenomenology of ELMs is reviewed, emphasizing the conditions for their occurrence, their repetition frequencies, their impact on confinement and the properties of associated fluctuations, in order to understand the physics involved.
Journal ArticleDOI
Plasma shaping, edge ballooning stability and ELM behaviour in DIII-D
T. Ozeki,Ming-Sheng Chu,L.L. Lao,T. S. Taylor,M. S. Chance,Shigeyoshi Kinoshita,K. H. Burrell,R.D. Stambaugh +7 more
TL;DR: In this article, it was shown theoretically that flux surfaces near the separatrix of properly elongated and triangulated plasmas may be moved into the connection region between the first and second stability regions for ideal MHD ballooning modes, when q is high and the shear is low near the plasma surface.
Journal ArticleDOI
Studies of EDA H-Mode in Alcator C-Mod
Martin Greenwald,R. L. Boivin,P.T. Bonoli,C.L. Fiore,John Goetz,Robert Granetz,Amanda Hubbard,Ian H. Hutchinson,J. H. Irby,Yuxuan Lin,E.S. Marmar,A. Mazurenko,D. A. Mossessian,T. Sunn Pedersen,J. E. Rice,J. A. Snipes,G. Schilling,G. Taylor,J.L. Terry,S.M. Wolfe,S.J. Wukitch +20 more
TL;DR: In this paper, the enhanced Dα H-mode (EDA) was extended to include ohmic plasmas and strong edge density fluctuations were observed to accompany EDA and may be responsible for the change in particle transport which was observed.
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Characterization of enhanced Dα high-confinement modes in Alcator C-Mod
Martin Greenwald,R.L. Boivin,P.T. Bonoli,R. Budny,C.L. Fiore,J.A. Goetz,Robert Granetz,Amanda Hubbard,Ian H. Hutchinson,James Irby,Brian LaBombard,Yijun Lin,Bruce Lipschultz,Earl Marmar,A. Mazurenko,D. A. Mossessian,T. Sunn Pedersen,C. S. Pitcher,Miklos Porkolab,John Rice,William L. Rowan,J.A. Snipes,G. Schilling,Yuichi Takase,J.L. Terry,S.M. Wolfe,J. L. Weaver,B. Welch,S.J. Wukitch +28 more