Results 71 to 80 of about 464 (190)

Logarithmically discretized model of bounce averaged gyrokinetics and its implications on tokamak turbulence

, 2018
International audienceA logarithmically discretized model, which consists of writing the system in log polar coordinates in wave-number domain and reducing the nonlinear interactions to a sum over neighboring scales that satisfy the triad conditions, is ...
Morel, Pierre, Shaokang Xu, Xu, S., Gürcan, Özgür, D., Ö. D. Gürcan, P. Morel, Gürcan, Özgür,   +6 more
core   +1 more source

Numerical study of limits of neoclassical theory in the plateau regime in the presence of impurities

Contributions to Plasma Physics, Volume 64, Issue 3, March 2024.
Abstract This paper presents a numerical simulation to test the corrections to the radial electric field in the presence of impurities for tokamak devices whose main ions are in the plateau regime. The effects due to the presence of impurity density variation in a pedestal tokamak are known to generate conditions where conventional neoclassical theory ...
Riccardo Nicolò Iorio, T. P. Kiviniemi, E. Hirvijoki, L. Chône, S. Janhunen, F. Albert, S. Leerink   +6 more
wiley   +1 more source

Coarse-grained gyrokinetics for the critical ion temperature gradient in stellarators

Physical Review Research, 2022
We present a modified gyrokinetic theory to predict the critical gradient that determines the linear onset of the ion temperature gradient (ITG) mode in stellarator plasmas.
G. T. Roberg-Clark, G. G. Plunk, P. Xanthopoulos   +2 more
doaj   +1 more source

Reduced electrostatic turbulence in the quasi-isodynamic stellarator configuration CIEMAT-QI4

Nuclear Fusion
CIEMAT-QI4 is a quasi-isodynamic stellarator configuration that simultaneously features very good fast-ion confinement in a broad range of β values, low neoclassical transport and bootstrap current, and ideal magnetohydrodynamic stability up to $\beta ...
J.M. García-Regaña, I. Calvo, E. Sánchez, H. Thienpondt, J.L. Velasco, J.A. Capitán   +5 more
doaj   +1 more source

Integrated modelling of neon impact on JET H-mode core plasmas

Nuclear Fusion, 2022
Nuclear fusion reactor plasmas will need to exhaust a significant proportion of energy flux through radiative processes, to enable acceptable divertor loads. This can be obtained by line radiation from impurities, injected from the plasma edge. There are
M. Marin, J. Citrin, C. Giroud, C. Bourdelle, Y. Camenen, L. Garzotti, A. Ho, M. Sertoli, JET Contributors   +8 more
doaj   +1 more source

First global gyrokinetic profile predictions of ITER burning plasma

Nuclear Fusion
In this work, we present the first global gyrokinetic simulations of the ITER baseline scenario at 15 MA, performed using the GENE-Tango framework in both electrostatic and electromagnetic regimes.
A. Di Siena, C. Bourdelle, A. Bañón Navarro, G. Merlo, T. Görler, E. Fransson, A. Polevoi, S.H. Kim, F. Koechl, A. Loarte, E. Fable, C. Angioni, P. Mantica, F. Jenko   +13 more
doaj   +1 more source

ESR2D: a two-dimensional Fourier-space global gyrokinetic eigenvalue code for the ion-temperature-gradient modes in tokamaks

Nuclear Fusion
A two-dimensional (2D) Fourier-space global gyrokinetic eigenvalue solver, ESR2D, has been developed to solve the 2D gyrokinetic eigenvalue problem for the ion-temperature-gradient (ITG) modes in tokamaks. With no simplifying assumptions made for passing
Haochuan Wang, Jie Wang, Yuefeng Qiu, Shaojie Wang, Zihao Wang, Tiannan Wu, Yuesong Li, Yicheng Cai, Shiqi Xiao   +8 more
doaj   +1 more source

Interplay between core, edge and scrape-off layer in turbulent magnetised plasmas: Lessons learnt from an information theoretic measure, the "transfer entropy" to assess causality in nonlinear plasma dynamics

, 2021
International audienceThe present manuscript is meant to provide a companion pedagogical approach to an information theoretic measure, the "Transfer Entropy" method, useful to assess causality in complex (time series) datasets.
Ghendrih, Ph., Dif-Pradalier, Guilhem, Garbet, X., Grandgirard, V, Varennes, R., Sarazin, Y., Munschy, Y., Camenen, Y., Widmer, F., Vermare, L.   +9 more
core  

Local full-wave energy in nonuniform plasmas [PDF]

, 1988
The subject of local wave energy in plasmas is treated via quasilinear theory from the dual perspectives of the action-angle formalism and gyrokinetics analysis.
Smithe, D.N., D.N. Smithe
core   +1 more source

Influence of magnetic shear on kinetic ballooning modes and electromagnetic stellarator turbulence

Nuclear Fusion
The influence of magnetic shear on kinetic ballooning modes (KBMs) and electromagnetic turbulence is reported in the Wendelstein 7-X (W7-X) and Heliotron-J (H-J) stellarators.
P. Mulholland, K. Aleynikova, M.J. Pueschel, J.H.E. Proll, A. Ishizawa   +4 more
doaj   +1 more source