66 citations · 289 across the 16 of their papers we have counts for
16 papers
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…
Direct Microstability Optimization of Stellarator Devices
R. Jorge, W. Dorland, P. Kim +4
Turbulent transport is regarded as one of the key issues in magnetic confinement nuclear fusion, both for tokamaks in stellarators. In this work, we show that a significant decreas…
Zonal Flow Excitation in Electron-Scale Tokamak Turbulence
Stefan Tirkas, Haotian Chen, Gabriele Merlo +2
The derivation of an intermediate-scale gyrokinetic-electron theory in nonuniform tokamak plasmas [Chen H. et al 2021 Nucl. Fusion 61 066017] has shown that a Navier-Stokes type no…
Predictions of improved confinement in SPARC via energetic particle turbulence stabilization
A. Di Siena, P. Rodriguez-Fernandez, N. T. Howard +8
The recent progress in high-temperature superconductor technologies has led to the design and construction of SPARC, a compact tokamak device expected to reach plasma breakeven wit…
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…
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…
A general framework for quantifying uncertainty at scale
Ionut-Gabriel Farcas, Gabriele Merlo, Frank Jenko
In many fields of science, comprehensive and realistic computational models are available nowadays. Often, the respective numerical calculations call for the use of powerful superc…
Nonlocal effects in negative triangularity TCV plasmas
G. Merlo, Z. Huang, C. Marini +7
Global gradient driven GENE gyrokinetic simulations are used to investigate TCV plasmas with negative triangularity. Considering a limited L-mode plasma, corresponding to an experi…
Microtearing modes as the source of magnetic fluctuations in the JET pedestal
D. R. Hatch, M. Kotschenreuther, S. M. Mahajan +15
We report on a detailed study of magnetic fluctuations in the JET pedestal, employing basic theoretical considerations, gyrokinetic simulations, and experimental fluctuation data,…
Nonlinear symmetry breaking in electron temperature gradient driven turbulence
Salomon Janhunen, Gabriele Merlo, Frank Jenko +3
Nonlinear symmetry breaking may occur in systems with two or more states whose linear dynamics displays certain symmetries, one of which is preferred nonlinearly. We have identifie…
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…
How eigenmode self-interaction affects zonal flows and convergence of tokamak core turbulence with toroidal system size
Ajay C. J., Stephan Brunner, Ben McMillan +3
Self-interaction is the process by which a microturbulence eigenmode that is extended along the direction parallel to the magnetic field interacts with itself non-linearly. This ef…
FanStore: Enabling Efficient and Scalable I/O for Distributed Deep Learning
Zhao Zhang, Lei Huang, Uri Manor +5
Emerging Deep Learning (DL) applications introduce heavy I/O workloads on computer clusters. The inherent long lasting, repeated, and random file access pattern can easily saturate…
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…
Bringing global gyrokinetic turbulence simulations to the transport timescale using a multiscale approach
Jeffrey B. Parker, Lynda L. LoDestro, Daniel Told +5
The vast separation dividing the characteristic times of energy confinement and turbulence in the core of toroidal plasmas makes first-principles prediction on long timescales extr…
Cross-code gyrokinetic verification and benchmark on the linear collisionless dynamics of the geodesic acoustic mode
A. Biancalani, A. Bottino, C. Ehrlacher +10
The linear properties of the geodesic acoustic modes (GAM) in tokamaks are investigated by means of the comparison of analytical theory and gyrokinetic numerical simulations. The d…