101 citations · 641 across the 26 of their papers we have counts for
26 papers
How Fusion-Born Alpha Particles Suppress Microturbulence in Burning Plasmas
Alessandro Di Siena, Alejandro Banon Navarro, Pablo Rodriguez-Fernandez +13
A central unresolved question in fusion energy research is whether energetic alpha particles, the primary products of deuterium-tritium fusion reactions, enhance or degrade plasma…
Machine Learning for Electron-Scale Turbulence Modeling in W7-X
Ionut-Gabriel Farcas, Don Lawrence Carl Agapito Fernando, Alejandro Banon Navarro +2
Constructing reduced models for turbulent transport is essential for accelerating profile predictions and enabling many-query tasks such as parameter exploration and design optimiz…
Global gyrokinetic analysis of Wendelstein 7-X discharge: unveiling the importance of trapped-electron-mode and electron-temperature-gradient turbulence
Felix Wilms, Alejandro Bañón Navarro, Thomas Windisch +8
We present the first nonlinear, gyrokinetic, radially global simulation of a discharge of the Wendelstein 7-X-like stellarator (W7-X), including kinetic electrons, an equilibrium r…
Reassessing the impact of megaelectronvolt ions in fusion plasmas via gyrokinetic simulations
Alessandro Di Siena, Gabriele Merlo, Alejandro Banon Navarro +2
Gyrokinetic simulations conducted by Mazzi et al. reveal the suppression of turbulence in fusion plasmas through the destabilization of Toroidal Alfvén Eigenmodes (TAEs) by megaele…
First-principles based plasma profile predictions for optimized stellarators
A. Bañón Navarro, A. Di Siena, J. L. Velasco +6
In the present Letter, first-of-its-kind computer simulations predicting plasma profiles for modern optimized stellarators -- while self-consistently retaining neoclassical transpo…
The Problem of Marginality in Model Reductions of Turbulence
C. Gillot, G. Dif-Pradalier, Y. Sarazin +8
Reduced quasilinear (QL) and nonlinear (gradient-driven) models with scale separations, commonly used to interpret experiments and to forecast turbulent transport levels in magneti…
Global gyrokinetic simulations of ASDEX Upgrade up to the transport time-scale with GENE-Tango
A. Di Siena, A. Banon Navarro, T. Luda +12
An accurate description of turbulence up to the transport time scale is essential for predicting core plasma profiles and enabling reliable calculations for designing advanced scen…
Electrostatic gyrokinetic simulations in Wendelstein 7-X geometry: benchmark between the codes stella and GENE
A. González-Jerez, P. Xanthopoulos, J. M. García-Regaña +6
The first experimental campaigns have proven that, due to the optimization of the magnetic configuration with respect to neoclassical transport, the contribution of turbulence is e…
Gyrokinetic simulations in stellarators using different computational domains
E. Sánchez, J. M. García-Regaña, A. Bañón Navarro +9
In this work, we compare gyrokinetic simulations in stellarators using different computational domains, namely, flux tube, full-flux-surface, and radially global domains. Two probl…
New high-confinement regime with fast ions in the core of fusion plasmas
A. Di Siena, R. Bilato, T. Görler +12
The key result of the present work is the theoretical prediction and observation of the formation of a new type of transport barrier in fusion plasmas, called F-ATB (fast ion-induc…
Global gyrokinetic simulations of ITG turbulence in the configuration space of the Wendelstein 7-X stellarator
A. Bañón Navarro, G. Merlo, G. G. Plunk +7
We study the effect of turbulent transport in different magnetic configurations of the Weldenstein 7-X stellarator. In particular, we performed direct numerical simulations with th…
Electromagnetic turbulence suppression by energetic particle driven modes
A. Di Siena, T. Görler, E. Poli +3
In recent years, a strong reduction of plasma turbulence in the presence of energetic particles has been reported in a number of magnetic confinement experiments and corresponding…
Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas
T. F. Neiser, F. Jenko, T. A. Carter +7
We present gyrokinetic simulations with the GENE code addressing the near-edge region of an L-mode plasma in the DIII-D tokamak. At radial position , simulations with the i…
Fully kinetic versus reduced-kinetic modelling of collisionless plasma turbulence
D. Groselj, S. S. Cerri, A. Banon Navarro +5
We report the results of a direct comparison between different kinetic models of collisionless plasma turbulence in two spatial dimensions. The models considered include a first pr…
Nonlinear growth of zonal flows by secondary instability in general magnetic geometry
G. G. Plunk, A. Bañón Navarro
We present a theory of the nonlinear growth of zonal flows in magnetized plasma turbulence, by the mechanism of secondary instability. The theory is derived for general magnetic ge…
The Structure of Plasma Heating in Gyrokinetic Alfvénic Turbulence
A. B. Navarro, B. Teaca, D. Told +3
We analyze plasma heating in weakly collisional kinetic Alfvén wave (KAW) turbulence using high resolution gyrokinetic simulations spanning the range of scales between the ion and…
Kinetic intermittency in magnetized plasma turbulence
Bogdan Teaca, Alejandro Bañón Navarro, Daniel Told +1
We employ magnetized plasma turbulence, described by a gyrokinetic formalism in an interval ranging from the end of the fluid scales to the electron gyroradius, to introduce the fi…
The anisotropic redistribution of free energy for gyrokinetic plasma turbulence in a Z-pinch
Alejandro Banon Navarro, Bogdan Teaca, Frank Jenko
For a Z-pinch geometry, we report on the nonlinear redistribution of free energy across scales perpendicular to the magnetic guide field, for a turbulent plasma described in the fr…
Gyrokinetic studies of core turbulence features in ASDEX Upgrade H-mode plasmas
A. Banon Navarro, T. Happel, T. Goerler +6
Gyrokinetic validation studies are crucial in developing confidence in the model incorporated in numerical simulations and thus improving their predictive capabilities. As one step…
Collision-dependent power law scalings in 2D gyrokinetic turbulence
S. S. Cerri, A. Bañón Navarro, F. Jenko +1
Nonlinear gyrokinetics provides a suitable framework to describe short-wavelength turbulence in magnetized laboratory and astrophysical plasmas. In the electrostatic limit, this sy…
The energetic coupling of scales in gyrokinetic plasma turbulence
Bogdan Teaca, Alejandro Bañón Navarro, Frank Jenko
In magnetized plasma turbulence, the couplings of perpendicular spatial scales that arise due to the nonlinear interactions are analyzed from the perspective of the free-energy exc…
Understanding nonlinear saturation in zonal-flow-dominated ion temperature gradient turbulence
G. G. Plunk, A. Bañón Navarro, F. Jenko
We propose a quantitative model of ion temperature gradient driven turbulence in toroidal magnetized plasmas. In this model, the turbulence is regulated by zonal flows, i.e. mode s…
Locality properties of the free energy fluxes in gyrokinetic turbulence
Bogdan Teaca, Alejandro Banon Navarro, Frank Jenko +2
The nature of the nonlinear interactions in gyrokinetic (GK) turbulence, driven by an ion-temperature gradient instability, is investigated using numerical simulations of single io…
Dynamic Procedure for Filtered Gyrokinetic Simulations
Pierre Morel, Alejandro Bañón Navarro, Michel Albrecht-Marc +4
Large Eddy Simulations (LES) of gyrokinetic plasma turbulence are investigated as interesting candidates to decrease the computational cost. A dynamic procedure is implemented in t…