Results 91 to 100 of about 154 (149)

On the importance of parallel magnetic-field fluctuations for electromagnetic instabilities in STEP

Nuclear Fusion
This paper discusses the importance of parallel perturbations of the magnetic-field in gyrokinetic simulations of electromagnetic instabilities and turbulence at mid-radius in the burning plasma phase of the conceptual high- β , reactor-scale, tight ...
D. Kennedy, C.M. Roach, M. Giacomin, P.G. Ivanov, T. Adkins, F. Sheffield, T. Görler, A. Bokshi, D. Dickinson, H.G. Dudding, B.S. Patel   +10 more
doaj   +1 more source

A general framework for quantifying uncertainty at scale. [PDF]

Commun Eng, 2022
Farcaş IG, Merlo G, Jenko F.
europepmc   +1 more source

Considering fluctuation energy as a measure of gyrokinetic turbulence

New Journal of Physics, 2012
In gyrokinetic theory, there are two quadratic measures of fluctuation energy, left invariant under nonlinear interactions, that constrain turbulence. In a recent work (Plunk and Tatsuno 2011 Phys. Rev. Lett.
G G Plunk, T Tatsuno, W Dorland
doaj   +1 more source

Kinetic plasma-wall interaction using immersed boundary conditions

Nuclear Fusion
The interaction between a plasma and a solid surface is studied in a (1D-1V) kinetic approach using immersed boundary conditions and penalization to model the wall.
Yann Munschy, Emily Bourne, Guilhem Dif-Pradalier, Peter Donnel, Philippe Ghendrih, Virginie Grandgirard, Yanick Sarazin   +6 more
doaj   +1 more source

Overview of multiscale turbulence studies covering ion-to-electron scales in magnetically confined fusion plasma

Nuclear Fusion
Turbulent transport in magnetically confined fusion plasma has conventionally been analyzed at the ion gyroradius scale based on the microturbulence theory.
S. Maeyama, N.T. Howard, J. Citrin, T.-H. Watanabe, T. Tokuzawa   +4 more
doaj   +1 more source

Negative triangularity scenarios: from TCV and AUG experiments to DTT predictions

Nuclear Fusion
Experiments, gyrokinetic simulations and transport predictions were performed to investigate if a negative triangularity (NT) L-mode option for the Divertor Tokamak Test (DTT) full-power scenario would perform similarly to the positive triangularity (PT)
A. Mariani, L. Aucone, A. Balestri, P. Mantica, G. Merlo, R. Ambrosino, F. Bagnato, L. Balbinot, J. Ball, T. Bolzonella, D. Brioschi, I. Casiraghi, A. Castaldo, S. Coda, L. Frassinetti, V. Fusco, T. Happel, J. Hobirk, P. Innocente, R.M. McDermott, P. Muscente, T. Pütterich, O. Sauter, F. Sciortino, M. Vallar, B. Vanovac, N. Vianello, G. Vlad, C.F.B. Zimmermann, the EUROfusion Tokamak Exploitation team, the TCV Team, the ASDEX Upgrade Team   +31 more
doaj   +1 more source

Influence of the density gradient on turbulent heat transport at ion-scales: an inter-machine study with the gyrokinetic code stella

Nuclear Fusion
Efficient control of turbulent heat transport is crucial for magnetic confinement fusion reactors. This work discusses the complex interplay between density gradients and microinstabilities, shedding light on their impact on turbulent heat transport in ...
H. Thienpondt, J.M. García-Regaña, I. Calvo, G. Acton, M. Barnes   +4 more
doaj   +1 more source

Assessing the impact of alpha particles on thermal confinement in JET D-T plasmas through global GENE-Tango simulations

Nuclear Fusion
The capability of the global, electromagnetic gyrokinetic GENE code interfaced with the transport Tango solver is exploited to address the impact of fusion alpha particles (in their dual role of fast particles and heating source) on plasma profiles and ...
A. Di Siena, J. Garcia, R. Bilato, K. Kirov, J. Varela, A. Bañón Navarro, Hyun-Tae Kim, C. Challis, J. Hobirk, A. Kappatou, E. Lerche, D. Spong, C. Angioni, T. Görler, E. Poli, M. Bergmann, F. Jenko, JET contributors   +17 more
doaj   +1 more source

Simulations of edge and SOL turbulence in diverted negative and positive triangularity plasmas

Nuclear Fusion
Optimizing the performance of magnetic confinement fusion devices is critical to achieving an attractive fusion reactor design. Negative triangularity (NT) scenarios have been shown to achieve excellent levels of energy confinement, while avoiding edge ...
P. Ulbl, A. Stegmeir, D. Told, G. Merlo, K. Zhang, F. Jenko   +5 more
doaj   +1 more source

Nonequilibrium Gyrokinetic Fluctuation Theory and Sampling Noise in Gyrokinetic Particle-in-cell Simulations [PDF]

, 2007
The present state of the theory of fluctuations in gyrokinetic GK plasmas and especially its application to sampling noise in GK particle-in-cell PIC simulations is reviewed. Topics addressed include the Δf method, the fluctuation-dissipation theorem for both classical and GK many-body plasmas, the Klimontovich formalism, sampling noise in PIC ...
openaire   +2 more sources