Results 91 to 100 of about 158 (153)

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

Effect of reversed magnetic shear on short wavelength ion temperature gradient modes in ADITYA-U tokamak

Nuclear Fusion
Ion temperature gradient (ITG) modes in the short wavelength regime ( $k_\theta \rho_i \gt 1.0$ ) known as the short wavelength ion temperature gradient (SWITG) modes, are investigated linearly and nonlinearly in the electrostatic limit for ADITYA-U ...
Gopal Krishna M., Sagar Choudhary, J. Chowdhury, Amit K. Singh, T. Hayward-Schneider, E. Lanti, R. Ganesh, L. Villard   +7 more
doaj   +1 more source

Gyrokinetic limitations and improvements

, 2016
For a tokamak, we consider gyrokinetic quasineutrality limitations when evaluating the axisymmetric radial electric field; a gyrokinetic entropy production restriction on the ion temperature pedestal; and a hybrid gyrokinetic-fluid treatment valid on transport time scales.
Catto, P, Parra, F, Kagan, G, Simakov, A
openaire   +1 more source

Application of the averaging method to the gyrokinetic plasma

Asymptotic Analysis, 2006
We show that the solution to an oscillatory–singularly perturbed ordinary differential equation may be asymptotically expanded into a sum of oscillating terms. Each of those terms writes as an oscillating operator acting on the solution to a nonoscillating ordinary differential equation with an oscillating correction added to it.
openaire   +3 more sources

On the transition to large fluxes and access to second stability in gyrokinetic simulations of electromagnetic turbulence in STEP

Nuclear Fusion
This work investigates the nonlinear transition to large heat fluxes observed in local gyrokinetic (GK) simulations of electromagnetic (EM) turbulence in STEP (Meyer 2024 Phil. Trans. R. Soc. 382 20230406). Using the stress-balance framework of (Zhang et
D. Kennedy, Y. Zhang, T. Adkins, P.G. Ivanov, F.J. Casson, H.G. Dudding, B.S. Patel, C.M. Roach, H.R. Wilson   +8 more
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A kinetic line-driven radiation operator and its application to Gyrokinetics

Nuclear Fusion
A velocity dependent, kinetic model for line radiation is developed for continuum kinetic codes. It has been implemented in the full- f gyrokinetic code Gkeyll.
Jonathan Roeltgen, James Juno, Mike Kotschenreuther, Tess Bernard, Akash Shukla, Manaure Francisquez, Ammar Hakim, Gregory Hammett, Dominic Power, David Hatch   +9 more
doaj   +1 more source

Visualization techniques for the gyrokinetic tokamak simulation code

Frontiers in Physics
Gyrokinetic simulations of plasma microturbulence in tokamaks are challenging to visualize because the compute grid follows the magnetic field lines that spiral around the torus.
Eliot Feibush, Stephane Ethier, Jason Yan, Alexander Yao   +3 more
doaj   +1 more source