Journal ArticleDOI
Tungsten transport in JET H-mode plasmas in hybrid scenario, experimental observations and modelling
C. Angioni,P. Mantica,Th. Pütterich,M. Valisa,M. Baruzzo,Emily Belli,P. Belo,F. J. Casson,C. Challis,P. Drewelow,C. Giroud,N. C. Hawkes,T. C. Hender,J. Hobirk,Tuomas Koskela,L. Lauro Taroni,C. F. Maggi,Jan Mlynar,T. Odstrcil,Matthew Reinke,M. Romanelli,Jet-Efda Contributors +21 more
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In this paper, the behavior of tungsten in the core of hybrid scenario plasmas in JET with the ITER-like wall is analysed and modelled with a combination of neoclassical and gyrokinetic codes.Abstract:
The behaviour of tungsten in the core of hybrid scenario plasmas in JET with the ITER-like wall is analysed and modelled with a combination of neoclassical and gyrokinetic codes In these discharges, good confinement conditions can be maintained only for the first 2?3?s of the high power phase Later W accumulation is regularly observed, often accompanied by the onset of magneto-hydrodynamical activity, in particular neoclassical tearing modes (NTMs), both of which have detrimental effects on the global energy confinement The dynamics of the accumulation process is examined, taking into consideration the concurrent evolution of the background plasma profiles, and the possible onset of NTMs Two time slices of a representative discharge, before and during the accumulation process, are analysed with two independent methods, in order to reconstruct the W density distribution over the poloidal cross-section The same time slices are modelled, computing both neoclassical and turbulent transport components and consistently including the impact of centrifugal effects, which can be significant in these plasmas, and strongly enhance W neoclassical transport The modelling closely reproduces the observations and identifies inward neoclassical convection due to the density peaking of the bulk plasma in the central region as the main cause of the accumulation The change in W neoclassical convection is directly produced by the transient behaviour of the main plasma density profile, which is hollow in the central region in the initial part of the high power phase of the discharge, but which develops a significant density peaking very close to the magnetic axis in the later phase The analysis of a large set of discharges provides clear indications that this effect is generic in this scenario The unfavourable impact of the onset of NTMs on the W behaviour, observed in several discharges, is suggested to be a consequence of a detrimental combination of the effects of neoclassical transport and of the appearance of an islandread more
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Overview of the JET results in support to ITER
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Journal ArticleDOI
Overview of the SPARC tokamak
Alexander Creely,Martin Greenwald,S. B. Ballinger,Dan Brunner,John Canik,J. Doody,Tünde Fülöp,D. T. Garnier,Robert Granetz,T.K. Gray,Christopher Holland,Nathan Howard,J. W. Hughes,J. H. Irby,V.A. Izzo,G. J. Kramer,Adam Kuang,Brian LaBombard,Yuxuan Lin,Bruce Lipschultz,Nikolas Logan,Jeremy Lore,Earl Marmar,Kevin Montes,Robert Mumgaard,Carlos Paz-Soldan,Cristina Rea,Matthew Reinke,Pablo Rodriguez-Fernandez,K. Särkimäki,F. Sciortino,S. D. Scott,Antti Snicker,P. B. Snyder,Brandon Sorbom,R. Sweeney,Roy Tinguely,E.A. Tolman,Maxim Umansky,O. Vallhagen,Jari Varje,D.G. Whyte,John Wright,S.J. Wukitch,Jinxiang Zhu +44 more
TL;DR: The SPARC tokamak is a critical next step towards commercial fusion energy as discussed by the authors, and it is designed as a high-field high-energy particle accelerator relevant to fusion power plants.
Journal ArticleDOI
Advances in the Physics Basis for the European DEMO Design
Ronald Wenninger,Frederik Arbeiter,J. Aubert,Leena Aho-Mantila,Raffaele Albanese,Roberto Ambrosino,C. Angioni,J.F. Artaud,M. Bernert,E. Fable,Ambrogio Fasoli,G. Federici,J. Garcia,G. Giruzzi,Frank Jenko,Patrick Maget,Massimiliano Mattei,F. Maviglia,Emanuele Poli,G. Ramogida,C. Reux,M. Schneider,B. Sieglin,Fabio Villone,M. Wischmeier,H. Zohm +25 more
TL;DR: In the European fusion roadmap, ITER is followed by a demonstration fusion power reactor (DEMO), for which a conceptual design is under development as mentioned in this paper, and the first results of a coherent effort to develop the relevant physics knowledge for that are reported by European experts.
Journal ArticleDOI
Theoretical description of heavy impurity transport and its application to the modelling of tungsten in JET and ASDEX Upgrade
F. J. Casson,C. Angioni,Emily Belli,R. Bilato,P. Mantica,T. Odstrcil,Th. Pütterich,M. Valisa,L. Garzotti,C. Giroud,J. Hobirk,C. F. Maggi,Jan Mlynar,Matthew Reinke,Jet-Efda Contributors +14 more
TL;DR: In this article, the effects of poloidal asymmetries and heated minority species are shown to be necessary to accurately describe heavy impurity transport in present experiments in JET and ASDEX Upgrade.
Impact of nitrogen seeding on confinement and power load control of a high-triangularity JET
C. Giroud,G. P. Maddison,S. Jachmich,F.G. Rimini,M. N. A. Beurskens,I. Balboa,S. Brezinsek,R. Coelho,J. W. Coenen,Lorenzo Frassinetti,E. Joffrin,M. Oberkofler,Michael Lehnen,Y. Q. Liu,S. Marsen,K. McCormick,A. G. Meigs,R. Neu,B. Sieglin,G.J. van Rooij,G. Arnoux,P. Belo,M. Brix,M. Clever,I. H. Coffey,Stéphane Devaux,D. Douai,T. Eich,J. Flanagan,S. Gr¨unhagen,A. Huber,M. Kempenaars,U. Kruezi,K. D. Lawson,P. J. Lomas,C.G. Lowry,Isabel L. Nunes,A. Sirinnelli,A. C. C. Sips,M.F. Stamp,S. Wiesenand Jet-Efda contributors +40 more
Abstract: This paper reports the impact on confinement and power load of the high-shape 2.5 MA ELMy H-mode scenario at JET of a change from all carbon plasma-facing components to an all metal wall. In preparation to this change, systematic studies of power load reduction and impact on confinement as a result of fuelling in combination with nitrogen seeding were carried out in JET-C and are compared with their counterpart in JET with a metallic wall. An unexpected and significant change is reported on the decrease in the pedestal confinement but is partially recovered with the injection of nitrogen.
References
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Journal ArticleDOI
Neoclassical transport of impurities in tokamak plasmas
S.P. Hirshman,D.J. Sigmar +1 more
TL;DR: In this paper, a closed set of moment equations is presented for the time evolution of thermodynamic and magnetic field quantities which results from collisional transport of the plasma and two-dimensional motion of the magnetic flux surface geometry.
Journal ArticleDOI
Bootstrap current and neoclassical transport in tokamaks of arbitrary collisionality and aspect ratio
TL;DR: In this article, a multi-species fluid model is described for the steady state parallel and radial force balance equations in axisymmetric tokamak plasmas, and the bootstrap current, electrical resistivity and particle and heat fluxes are evaluated in terms of the rotation velocities and friction and viscosity coefficients.
Journal ArticleDOI
Neoclassical ion transport in rotating axisymmetric plasmas
F. L. Hinton,S. K. Wong +1 more
TL;DR: In this paper, a drift kinetic equation is derived for rotating axisymmetric plasmas, where the radial gradient of the toroidal angular velocity appears as a driving term like the temperature gradient.
Journal ArticleDOI
JET ITER-like wall - overview and experimental programme
G. F. Matthews,M. N. A. Beurskens,S. Brezinsek,M. Groth,E. Joffrin,A. Loving,M. Kear,M. L. Mayoral,Rudolf Neu,P. Prior,V. Riccardo,F. Rimini,Marek Rubel,G. Sips,E. Villedieu,P. de Vries,M. L. Watkins,Efda-Jet Contributors +17 more
TL;DR: In this article, the successful installation of the JET ITER-like wall and the realization of its technical objectives is reported, and an overview of the planned experimental program which has been optimized to exploit the new wall and other JET enhancements in 2011/12.
Journal ArticleDOI
The nonlinear gyro-kinetic flux tube code GKW
A. G. Peeters,Yann Camenen,F. J. Casson,William Hornsby,A. P. Snodin,D. Strintzi,Gabor Szepesi +6 more
TL;DR: A new nonlinear gyro-kinetic flux tube code (GKW) for the simulation of micro instabilities and turbulence in magnetic confinement plasmas is presented in this paper, which incorporates all physics effects that can be expected from a state of the art gyro -kinetic simulation code in the local limit.
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