Flux-driven integrated modelling of main ion pressure and trace tungsten transport in ASDEX Upgrade
O. Linder,O. Linder,J. Citrin,G. M. D. Hogeweij,C. Angioni,Clarisse Bourdelle,F. J. Casson,E. Fable,A. Ho,F. Koechl,M. Sertoli +10 more
TLDR
In this paper, the quasilinear gyrokinetic code QuaLiKiz is applied for successful predictions of core kinetic profiles in an ASDEX Upgrade H-mode discharge in the turbulence dominated region within the integrated modelling suite JETTO.Abstract:
Neoclassical and turbulent heavy impurity transport in tokamak core plasmas are determined by main ion temperature, density and toroidal rotation profiles. Thus, in order to understand and prevent experimental behaviour of W accumulation, flux-driven integrated modelling of main ion heat and particle transport over multiple confinement times is a vital prerequisite. For the first time, the quasilinear gyrokinetic code QuaLiKiz is applied for successful predictions of core kinetic profiles in an ASDEX Upgrade H-mode discharge in the turbulence dominated region within the integrated modelling suite JETTO. Neoclassical contributions are calculated by NCLASS; auxiliary heat and particle deposition profiles due to NBI and ECRH are prescribed from previous analysis with TRANSP. Turbulent and neoclassical contributions are insufficient in explaining main ion heat and particle transport inside the q = 1 surface, necessitating the prescription of further transport coefficients to mimic the impact of MHD activity on central transport. The ion to electron temperature ratio at the simulation boundary at p tor=0.85 stabilizes ion scale modes while destabilizing ETG modes when significantly exceeding unity. Careful analysis of experimental measurements using Gaussian process regression techniques is carried out to explore reasonable uncertainties. In following trace W impurity transport simulations performed with additionally NEO, neoclassical transport under consideration of poloidal asymmetries alone is found to be insufficient to establish hollow central W density profiles. Reproduction of these conditions measured experimentally is found possible only when assuming the direct impact of a saturated (m, n) = (1, 1) MHD mode on heavy impurity transport.read more
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Plasma wall interaction and its implication in an all tungsten divertor tokamak. Invited Paper
R. Neu,M. Balden,V. Bobkov,R. Dux,O. Gruber,A. Herrmann,A. Kallenbach,Michael Kaufmann,C. F. Maggi,H. Maier,H. W. Müller,Th. Pütterich,R. Pugno,V. Rohde,A. C. C. Sips,J. Stober,W. Suttrop,C. Angioni,C. V. Atanasiu,W. Becker,K. Behler,K.H. Behringer,A. Bergmann,T. Bertoncelli,R. Bilato,Alberto Bottino,Marco Brambilla,F. Braun,A. Buhler,A. V. Chankin,Garrard Conway,D. P. Coster,P. de Marne,S. Dietrich,K. Dimova,R. Drube,T. Eich,K. Engelhardt,H.-U. Fahrbach,Ursel Fantz,L. Fattorini,J. Fink,R. Fischer,A. Flaws,P. Franzen,Julia Fuchs,K. Gal,M. Garcia Munoz,M. Gemisic-Adamov,L. Giannone,S. Gori,S. da Graca,H. Greuner,A. Gude,Sibylle Günter,G. Haas,J. Harhausen,Bernd Heinemann,N. Hicks,J. Hobirk,D. Holtum,Ch. Hopf,L. D. Horton,M. Huart,V. Igochine,S. Kalvin,O. J. W. F. Kardaun,M. Kick,G. Kocsis,H. Kollotzek,C. Konz,K. Krieger,Taina Kurki-Suonio,B. Kurzan,K. Lackner,Peter Lang,Philipp Lauber,Martin Laux,J. Likonen,Lin Liu,A. Lohs,K. Mank,A. Manini,M. E. Manso,M. Maraschek,P. Martin,Y. R. Martin,M. Mayer,Patrick J. McCarthy,K. McCormick,H. Meister,F. Meo,P. Merkel,R. Merkel,V. Mertens,F. Merz,H. Meyer,M. Mlynek,F. Monaco,H. D. Murmann,G. Neu,J. Neuhauser,B. Nold,J.-M. Noterdaeme,G. Pautasso,G. V. Pereverzev,Emanuele Poli,M. Pueschel,Gerhard Raupp,M. Reich,B. Reiter,T. T. Ribeiro,R. Riedl,J. Roth,M. Rott,F. Ryter,W. Sandmann,J. Santos,K. Sassenberg,A. Scarabosio,G. Schall,J. Schirmer,A. Schmid,Wolf-Dieter Schneider,G. Schramm,R. Schrittwieser,W. Schustereder,J. Schweinzer,S. Schweizer,Bruce D. Scott,U. Seidel,F. Serra,M. Sertoli,A. Sigalov,Ana Elisa Bauer de Camargo Silva,E. Speth,A. Stäbler,K.-H. Steuer,E. Strumberger,G. Tardini,C. Tichmann,W. Treutterer,C. Tröster,L. Urso,E. Vainonen-Ahlgren,P. Varela,Laure Vermare,D. Wagner,M. Wischmeier,E. Wolfrum,E. Würsching,D. Yadikin,Q. Yu,D. Zasche,Thomas Zehetbauer,M. Zilker,H. Zohm +156 more
TL;DR: In this article, it was found that the large He content in the plasma, resulting from DC glow discharges for conditioning, leads to a confinement reduction and after the change to D glow for inter-shot conditioning, the He content quickly dropped and, in parallel, the usual H-mode confinement with H factors close to one was achieved.
Poloidal variation of high-Z impurity density due to hydrogen minority ion cyclotron resonance heating on Alcator C-Mod
Matthew Reinke,Ian H. Hutchinson,John Rice,Nathaniel Thomas Howard,A. Bader,Stephen Wukitch,Yijun Lin,David Pace,Amanda Hubbard,J. W. Hughes,Y. Podpaly +10 more
TL;DR: In this paper, a parallel high-Z impurity transport theory is extended to account for cyclotron effects and shown to agree with experimentally measured impurity density asymmetries.
Journal ArticleDOI
Application of Gaussian process regression to plasma turbulent transport model validation via integrated modelling
Allison Ho,Jonathan Citrin,Fulvio Auriemma,Clarisse Bourdelle,F. J. Casson,Hyun-Tae Kim,Pierre Manas,Gabor Szepesi,H. Weisen,Jet Contributors +9 more
TL;DR: This paper outlines an approach towards improved rigour in tokamak turbulence transport model validation within integrated modelling.
Journal ArticleDOI
Fast modeling of turbulent transport in fusion plasmas using neural networks
K. L. van de Plassche,Jonathan Citrin,Clarisse Bourdelle,Yann Camenen,F. J. Casson,V. I. Dagnelie,Faa Federico Felici,A. Ho,S. Van Mulders,Jet Contributors +9 more
TL;DR: In this paper, an ultrafast neural network model, QLKNN, was proposed to predict core tokamak transport heat and particle fluxes, based on a database of 3'×'108 flux calculations of the quasilinear gyrokinetic transport model, QuaLiKiz.
Journal ArticleDOI
Predictions of core plasma performance for the SPARC tokamak
Pablo Rodriguez-Fernandez,Nathan Howard,Martin Greenwald,Alexander Creely,J. W. Hughes,John Wright,Christopher Holland,Yuxuan Lin,F. Sciortino +8 more
TL;DR: In this article, the authors present a detailed analysis of expected turbulence regimes with linear and nonlinear CGYRO simulations, demonstrating that profile predictions with the TGLF reduced model are in reasonable agreement.
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