Fast-ion transport in low density L-mode plasmas at TCV using FIDA spectroscopy and the TRANSP code
Benedikt Geiger,A. N. Karpushov,B. P. Duval,C. Marini,Olivier Sauter,Y. Andrebe,Duccio Testa,M Marascheck,Mirko Salewski,P. A. Schneider +9 more
TLDR
In this paper, a new neutral beam injection source of TCV has been performed with high fast-ion fractions (>20%) that exhibit a clear reduction of the loop voltage and a clear increase of the plasma pressure in on-and off-axis heating configurations.Abstract:
Experiments with the new neutral beam injection source of TCV have been performed with high fast-ion fractions (>20%) that exhibit a clear reduction of the loop voltage and a clear increase of the plasma pressure in on- and off-axis heating configurations. However, good quantitative agreement between the experimental data and TRANSP predictions is only found when including strong additional fast-ion losses. These losses could in part be caused by turbulence or MHD activity as, e.g. high frequency modes near the frequency of toroidicity induced Alfven eignmodes are observed. In addition, a newly installed fast-ion D-alpha (FIDA) spectroscopy system measures strong passive radiation and, hence, indicates the presence of high background neutral densities such that charge-exchange losses are substantial. Also the active radiation measured with the FIDA diagnostic, as well as data from a neutral particle analyzer, suggest strong fast-ion losses and large neutral densities. The large neutral densities can be justified since high electron temperatures (3-4 keV), combined with low electron densities (about 2 x 10(19) m(-3)) yield long mean free paths of the neutrals which are penetrating from the walls.read more
Citations
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Electron-temperature-gradient-driven turbulence
TL;DR: In this article, collisionless electron-temperature-gradient-driven (ETG) turbulence in toroidal geometry is studied via nonlinear numerical simulations and two massively parallel, fully gyrokinetic Vlasov codes are used, both including electromagnetic effects.
Journal Article
MHD induced fast ion losses in ASDEX Upgrade
M. Garcia-Munoz,H.-U. Fahrbach,H. Zohm,Josef Neuhauser,M. Maraschek,S. Guenter,Piero Martin,Karl Sassenberg,V. Igochine +8 more
TL;DR: A detailed knowledge of the interplay between MHD instabilities and energetic particles has been gained from direct measurements of fast-ion losses (FILs) using a scintillator based FIL detector as mentioned in this paper.
Journal ArticleDOI
Physics research on the TCV tokamak facility: from conventional to alternative scenarios and beyond
Stefano Coda,Matteo Agostini,Raffaele Albanese,Stefano Alberti,E. Alessi,S. Allan,J. S. Allcock,Roberto Ambrosino,H. Anand,Y. Andrebe,H. Arnichand,Fulvio Auriemma,J. Ayllon-Guerola,J. Ayllon-Guerola,F. Bagnato,Justin Ball,Marcelo Baquero-Ruiz,A. A. Beletskii,M. Bernert,W. Bin,P. Blanchard,T. C. Blanken,Jose Boedo,O. Bogar,Tommaso Bolzonella,F. Bombarda,N. Bonanomi,F. Bouquey,Christopher N. Bowman,D. Brida,Jérôme Bucalossi,J. Buermans,Hugo Bufferand,P. Buratti,G. Calabrò,L. Calacci,Yann Camenen,Daniele Carnevale,F. Carpanese,Matthew Carr,Lorella Carraro,A. Casolari,F. Causa,J. Čeřovský,O. Chellai,P. Chmielewski,D. Choi,N. Christen,G. Ciraolo,L. Cordaro,S. Costea,Nuno Cruz,A. Czarnecka,A. Dal Molin,P. David,J. Decker,H. De Oliveira,D. Douai,M. Dreval,Benjamin Daniel Dudson,M. G. Dunne,B. P. Duval,T. Eich,S. Elmore,Ola Embréus,B. Esposito,M. Faitsch,M. Farnik,Ambrogio Fasoli,Nicolas Fedorczak,Federico Felici,S. Feng,X. Feng,G. Ferro,Olivier Février,Ondrej Ficker,A. Fil,M. Fontana,Lorenzo Frassinetti,Ivo Furno,D. S. Gahle,Davide Galassi,K. Gałązka,A. Gallo,Cristian Galperti,S. Garavaglia,J. Garcia,M. Garcia-Munoz,M. Garcia-Munoz,Aitor J. Garrido,Izaskun Garrido,J. Gath,Benedikt Geiger,G. Giruzzi,Marco Gobbin,Timothy Goodman,Giuseppe Gorini,M. Gospodarczyk,Gustavo Granucci,Jonathan Graves,M. Gruca,T. Gyergyek,Antti Hakola,T. Happel,G. F. Harrer,J. R. Harrison,E. Havlickova,J. Hawke,S. S. Henderson,Pascale Hennequin,L. Hesslow,D. Hogeweij,J.-Ph. Hogge,Christian Hopf,Mathias Hoppe,J. Horacek,Z. Huang,Amanda Hubbard,A. Iantchenko,V. Igochine,P. Innocente,C. Ionita Schrittwieser,Heinz Isliker,R. Jacquier,A. Jardin,A. Kappatou,A. N. Karpushov,P. V. Kazantzidis,D. L. Keeling,N. A. Kirneva,N. A. Kirneva,Matthias Komm,M. Kong,Jernej Kovacic,N. Krawczyk,O. Kudlacek,Taina Kurki-Suonio,Roch Kwiatkowski,Benoit Labit,E. Lazzaro,B. Linehan,Bruce Lipschultz,X. Llobet,R. Lombroni,V. P. Loschiavo,T. Lunt,Eva Macusova,Jens Madsen,E. Maljaars,P. Mantica,M. Maraschek,C. Marchetto,A. Marco,A. Mariani,C. Marini,Y. R. Martin,F. Matos,Roberto Maurizio,Bojan Mavkov,Didier Mazon,Patrick J. McCarthy,R. M. McDermott,Vlado Menkovski,Antoine Merle,Harry M. Meyer,D. Micheletti,Fulvio Militello,K. Mitosinkova,J. Mlynář,Vladimir E. Moiseenko,P. Molina Cabrera,Jorge Morales,J-M Moret,A. Moro,Robert Mumgaard,Volker Naulin,R. D. Nem,F. Nespoli,Anders Nielsen,Stefan Kragh Nielsen,M. Nocente,S. Nowak,Nicola Offeddu,F.P. Orsitto,Roberto Paccagnella,Artur Palha,Gergely Papp,Alessandro Pau,R. O. Pavlichenko,A. Perek,V. Pericoli Ridolfini,F. Pesamosca,V. Piergotti,L. Pigatto,P. Piovesan,C. Piron,V.V. Plyusnin,Emanuele Poli,Laurie Porte,G. Pucella,M. E. Puiatti,T. Pütterich,M. Rabinski,J. Juul Rasmussen,T. Ravensbergen,M. Reich,H. Reimerdes,F. Reimold,C. Reux,D. Ricci,Paolo Ricci,N. Rispoli,Joël Rosato,S. Saarelma,Mirko Salewski,Anna Salmi,Olivier Sauter,M. Scheffer,Ch. Schlatter,B. S. Schneider,Roman Schrittwieser,S. E. Sharapov,R. R. Sheeba,U. A. Sheikh,R. Shousha,M. Silva,J. Sinha,Carlo Sozzi,M. Spolaore,L. Stipani,Pär Strand,T. Tala,A. S. Tema Biwole,A. A. Teplukhina,Duccio Testa,Christian Theiler,A.J. Thornton,G. Tomaž,M. Tomes,Minh Quang Tran,C. Tsironis,C.K. Tsui,C.K. Tsui,Jakub Urban,M. Valisa,M. Vallar,D. C. van Vugt,S. Vartanian,O. Vasilovici,Kevin Verhaegh,Laure Vermare,N. Vianello,E. Viezzer,E. Viezzer,W. A. J. Vijvers,Fabio Villone,I. Voitsekhovitch,N. M. T. Vu,Nick Walkden,Tom Wauters,M. Weiland,H. Weisen,M. Wensing,Matthias Wiesenberger,George Wilkie,M. Wischmeier,K. Wu,Maiko Yoshida,R. Zagórski,Paolo Zanca,J. Zebrowski,A. Zisis,Matteo Zuin +272 more
TL;DR: In this article, a 1 MW neutral beam injector has been used to expand the parameter range of the TCV tokamak to include ELMy H-mode discharges sustained by electron cyclotron and neutral beam current drive.
Journal ArticleDOI
Progress in modelling fast-ion D-alpha spectra and neutral particle analyzer fluxes using FIDASIM
Energetic ion transport by microturbulence is insignificant in tokamaks
David Pace,Max E Austin,E. M. Bass,Robert Budny,W. W. Heidbrink,J. C. Hillesheim,C. T. Holcomb,M. Gorelenkova,Brian Grierson,D. C. McCune,George McKee,Christopher Muscatello,Jin Myung Park,Clinton C. Petty,Terry Rhodes,G. M. Staebler,T. Suzuki,M. A. Van Zeeland,R. E. Waltz,G. Wang,Anne White,Zheng Yan,X. Yuan,Y. B. Zhu +23 more
TL;DR: In this article, a range of on-axis and off-axis beam injection scenarios are employed to vary relevant parameters such as the character of the background microturbulence and the value of Eb/Te, where Eb is the energetic ion energy and Te the electron temperature.
References
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Journal ArticleDOI
Electron temperature gradient driven turbulence
TL;DR: In this article, collisionless electron-temperature-gradient-driven (ETG) turbulence in toroidal geometry is studied via nonlinear numerical simulations via two massively parallel, fully gyrokinetic Vlasov codes.
Journal ArticleDOI
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
TL;DR: In this article, a code solving the Fokker-planck equation with the full collision operator and including the variation along the magnetic field line, coupled with the adjoint function formalism, has been used to calculate these coefficients in arbitrary equilibrium and collisionality regimes.
Journal ArticleDOI
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
TL;DR: The NUBEAM module as mentioned in this paper is a comprehensive computational model for Neutral Beam Injection (NBI) in tokamaks, which is used to compute power deposition, driven current, momentum transfer, fueling, and other profiles.
Journal ArticleDOI
Basic physics of Alfvén instabilities driven by energetic particles in toroidally confined plasmasa)
TL;DR: Alfven wave instability in toroidally confined plasmas is studied in this paper, where the authors identify three types of Alfven wave instabilities: frequency crossings of counterpropagating waves, extremum of the continuous spectrum, and reversed shear Alfven eigenmode.
Journal ArticleDOI
Heating of toroidal plasmas by neutral injection
TL;DR: A brief review of the physics of ion acceleration, charge exchange and ionization, trajectories for fast ions in toroidal magnetic fields, and fast-ion thermalization is given in this paper.