Results 21 to 30 of about 464 (190)

Energy Transfer and Electron Heating in Turbulent Flux Pileup Region

Geophysical Research Letters, Volume 49, Issue 24, 28 December 2022., 2022
Abstract We report observations of intense energy transfer developed within a flux pileup region (FPR) inside a plasma jet in the Earth's midtail. Strong electromagnetic turbulences, with ( and are wave numbers perpendicular and parallel to background magnetic field respectively), are observed together with intermittent sub‐ion‐scale structures ...
C. M. Liu, J. B. Cao, T. Y. Wang, X. N. Xing   +3 more
wiley   +1 more source

pyrokinetics

, 2023
Python library to run and analyse gyrokinetics simulationsIf you use this software, please cite it as ...
Dudding, H.G., Jayalekshmi, A.C., Kennedy, D., Pattinson, L., Hill, P., Dickinson, D., Casson, F.J., Patel, B.S., Giacomin, M.   +8 more
core   +1 more source

Verification of a fully implicit particle-in-cell method for the v ∥-formalism of electromagnetic gyrokinetics in the XGC code [PDF]

, 2021
A fully implicit particle-in-cell method for handling the v ∥-formalism of electromagnetic gyrokinetics has been implemented in XGC. By choosing the v ∥-formalism, we avoid introducing the nonphysical skin terms in Ampère's law, which are responsible for
Ku, S, Chacón, L, Hager, R, Sturdevant, Benjamin J, Hatch, D, Sharma, AY, Adams, MF, Cole, MDJ, Parker, SE, Chen, Y, Chang, CS, A. Y. Sharma, D. Hatch, M. D. J. Cole, S. Ku, R. Hager, L. Chacón, C. S. Chang, M. F. Adams, Y. Chen, S. E. Parker, Benjamin J. Sturdevant   +21 more
core   +1 more source

Implementation and verification of a conservative, multi‐species, gyro‐averaged, full‐f, Lenard‐Bernstein/Dougherty collision operator in the gyrokinetic code GENE‐X

Contributions to Plasma Physics, Volume 62, Issue 5-6, June‐July 2022., 2022
Abstract Gyrokinetic simulations are among the main tools to predict turbulent transport in the core of fusion devices. Unlike the core, the plasma edge and scrape‐off layer are characterized by lower temperature and higher collisionality. To allow for realistic gyrokinetic modelling of edge and scrape‐off layer turbulence, it is crucial to include ...
Philipp Ulbl, Dominik Michels, Frank Jenko   +2 more
wiley   +1 more source

Revisiting the improved core confinement simulations for FT‐2 tokamak

Contributions to Plasma Physics, Volume 62, Issue 5-6, June‐July 2022., 2022
Abstract In the present paper, we revisit observations performed in FT‐2 tokamak from previous works. Improvements of core confinement are observed and believed to be caused by wide orbits going from collisionless to collisional regimes. Similar phenomena can occur whenever gradient lengths are comparable to the orbit widths at the top of the pedestal ...
Riccardo Nicolò Iorio, Laurent Chône, Evgeniy Gusakov, Timo P. Kiviniemi, Serguey Lashkul, Susan Leerink   +5 more
wiley   +1 more source

Energetically consistent collisional gyrokinetics [PDF]

Physics of Plasmas, 2015
We present a formulation of collisional gyrokinetic theory with exact conservation laws for energy and canonical toroidal momentum. Collisions are accounted for by a nonlinear gyrokinetic Landau operator. Gyroaveraging and linearization do not destroy the operator's conservation properties.
J. W. Burby, A. J. Brizard, H. Qin
openaire   +2 more sources

Effect of toroidal particle sources on SOL physics in the FT‐2 tokamak

Contributions to Plasma Physics, Volume 62, Issue 5-6, June‐July 2022., 2022
Abstract Two gas‐puffs are used near limiters in the FT‐2 tokamak for the purpose of hydrogen refuelling during plasma discharges. This creates toroidal and poloidal asymmetry in particle sources near limiters which has to be considered in modelling. Here, the effect of toroidal asymmetry is simulated using the gyrokinetic code ELMFIRE.
Francis Clinton Prasanth Albert Devasagayam, Laurent Chôné, Timo Petteri Kiviniemi, Oksana Kaledina, Sergei Shatalin, Alexey Dmitrievich Gurchenko, Alexey Altukhov, Evgeniy Gusakov, Mikhail Kantor, Denis Kouprienko, Sergei Lashkul   +10 more
wiley   +1 more source

An Energy Conserving Vlasov Solver That Tolerates Coarse Velocity Space Resolutions: Simulation of MMS Reconnection Events

Journal of Geophysical Research: Space Physics, Volume 127, Issue 2, February 2022., 2022
Abstract Vlasov solvers that operate on a phase‐space grid are highly accurate but also numerically demanding. Coarse velocity space resolutions, which are largely unproblematic in particle‐in‐cell (PIC) simulations, can lead to numerical heating or oscillations in continuum Vlasov methods.
F. Allmann‐Rahn, S. Lautenbach, R. Grauer   +2 more
wiley   +1 more source

Quasilinear gyrokinetic theory: a derivation of QuaLiKiz [PDF]

Journal of Plasma Physics, 2021
In order to predict and analyse turbulent transport in tokamaks, it is important to model transport that arises from microinstabilities. For this task, quasilinear codes have been developed that seek to calculate particle, angular momentum and heat fluxes, both quickly and accurately.
C.D. Stephens, X. Garbet, J. Citrin, C. Bourdelle, K.L. van de Plassche, F. Jenko   +5 more
openaire   +3 more sources

Practical gyrokinetics [PDF]

Journal of Plasma Physics, 2019
Thousands of gyrokinetic papers have been published since the introduction of the gyrokinetic change of variables. The intent here is not to review the field, but rather the goal is to present a tutorial providing insight into why gyrokinetics is an appropriate description of turbulent transport.
openaire   +1 more source