Results 61 to 70 of about 464 (190)

Statistical Study of Electron Kinetic Entropy Generation at Earth's Quasi‐Perpendicular Bow Shock

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract We use the Magnetospheric Multiscale mission to study electron kinetic entropy across Earth's quasi‐perpendicular bow shock. We perform a statistical study of how the change in electron entropy depends on the different plasma parameters associated with a collisionless shock crossing.
M. Lindberg, A. Wallner, S. Berglund, A. Vaivads   +3 more
wiley   +1 more source

First-principle based predictions of the effects of negative triangularity on DTT scenarios

Nuclear Fusion
Plasmas with negative triangularity (NT) shape have been recently shown to be able to achieve H-mode levels of confinement in L-mode, avoiding detrimental edge localised modes.
A. Mariani, A. Balestri, P. Mantica, G. Merlo, R. Ambrosino, L. Balbinot, D. Brioschi, I. Casiraghi, A. Castaldo, L. Frassinetti, V. Fusco, P. Innocente, O. Sauter, G. Vlad   +13 more
doaj   +1 more source

On Validity of Gyrokinetic Theory

, 2023
We study the validity of gyrokinetic theory by examining the destruction of magnetic moment adiabatic invariant in the presence of fluctuations. Contrary to common assertions, it is shown for the first time that the gyrokinetic theory rests not only on the magnetic moment conservation, but also on the fact that the particle dynamics constitutes a ...
Chen, Haotian, Chen, Liu, Zonca, Fulvio, Li, Jiquan, Xu, Min   +4 more
openaire   +2 more sources

A numerical instability in an ADI algorithm for gyrokinetics [PDF]

Computer Physics Communications, 2005
We explore the implementation of an Alternating Direction Implicit (ADI) algorithm for a gyrokinetic plasma problem and its resulting numerical stability properties. This algorithm, which uses a standard ADI scheme to divide the field solve from the particle distribution function advance, has previously been found to work well for certain plasma ...
Emily Ann Belli, Gregory W. Hammett
openaire   +1 more source

Kinetic Theory of Drift‐Mirror Mode

Geophysical Research Letters, Volume 51, Issue 18, 28 September 2024.
Abstract We present a nonlocal gyrokinetic theory for the drift‐mirror mode in high‐β $\beta $ anisotropic plasmas. Here, β $\beta $ represents the ratio of plasma pressure to magnetic pressure. The equilibrium distribution is established self‐consistently via guiding‐center Hamiltonian theory.
Yao Yao, Haotian Chen, Zilong Li, Jiquan Li   +3 more
wiley   +1 more source

Modeling electron temperature profiles in the pedestal with simple formulas for ETG transport

Nuclear Fusion
This paper reports on the refinement (building on (Hatch D.R. et al 2022 Phys. Plasmas 29 062501)) and application of simple formulas for electron heat transport from electron temperature gradient (ETG) driven turbulence in the pedestal. The formulas are
D.R. Hatch, M.T. Kotschenreuther, P.-Y. Li, B. Chapman-Oplopoiou, J. Parisi, S.M. Mahajan, R. Groebner   +6 more
doaj   +1 more source

Freely decaying turbulence in two-dimensional electrostatic gyrokinetics

, 2012
In magnetized plasmas, a turbulent cascade occurs in phase space at scales smaller than the thermal Larmor radius ("sub-Larmor scales") [Tatsuno et al., Phys. Rev. Lett. 103, 015003 (2009)].
G. G. Plunk, Dorland, W., R. Numata, Barnes, M., Howes, G., T. Tatsuno, M. Barnes, W. Dorland, Numata, R., Plunk, G., G. G. Howes, Tatsuno, T.   +11 more
core   +1 more source

Direct Evidence of Drift‐Compressional Wave Generation in the Earth's Magnetosphere Detected by Arase

Geophysical Research Letters, Volume 51, Issue 8, 28 April 2024.
Abstract We present the first direct evidence of an in situ excitation of drift‐compressional waves driven by drift resonance with ring current protons in the magnetosphere. Compressional Pc4–5 waves with frequencies of 4–12 mHz were observed by the Arase satellite near the magnetic equator at L ∼ 6 in the evening sector on 19 November 2018.
K. Yamamoto, A. V. Rubtsov, D. V. Kostarev, P. N. Mager, D. Yu. Klimushkin, M. Nosé, A. Matsuoka, K. Asamura, Y. Miyoshi, S. Yokota, S. Kasahara, T. Hori, K. Keika, Y. Kasahara, A. Kumamoto, F. Tsuchiya, M. Shoji, S. Nakamura, I. Shinohara   +18 more
wiley   +1 more source

Stability and transport of gyrokinetic critical pedestals

Nuclear Fusion
A gyrokinetic threshold model for pedestal width–height scaling prediction is applied to multiple devices. A shaping and aspect ratio scan is performed on National Spherical Torus Experiment (NSTX) equilibria, finding $\Delta_{\mathrm{ped}} = 0.92 A^{1 ...
J.F. Parisi, A.O. Nelson, W. Guttenfelder, R. Gaur, J.W. Berkery, S.M. Kaye, K. Barada, C. Clauser, A. Diallo, D.R. Hatch, A. Kleiner, M. Lampert, T. Macwan, J.E. Menard   +13 more
doaj   +1 more source

Practical Gyrokinetics

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 ...
Peter J. Catto
core   +1 more source