Results 51 to 60 of about 1,964 (170)

Experimental study of core-localized TAEs during ICRF heated high βp plasmas on EAST

Nuclear Fusion
This study presents the first experimental investigation of core-localized Toroidal Alfvén eigenmodes (TAEs) during high- β _p plasmas heated purely by radio frequency waves (particularly ion cyclotron resonance frequency) on EAST.
C.Y. Pan, J. Huang, J. Varela, X.H. Wang, Y.X. Sun, Z.Q. Zhou, X.Z. Gong, X.J. Zhang, A. Ti, T.H. Shi, T. Zhang, Q. Zang, G.Q. Zhong, Y.B. Zhang, G.L. Lin, Z.C. Lin, the EAST Team   +16 more
doaj   +1 more source

Mixed diffusive-convective relaxation of a broad beam of energetic particles in cold plasma

, 2016
We revisit the applications of quasi-linear theory as a paradigmatic model for weak plasma turbulence and the associated bump-on-tail problem. The work, presented here, is built around the idea that large-amplitude or strongly shaped beams do not relax ...
Carlevaro, Nakia, Falessi, Matteo V., Milovanov, Alexander V., Montani, Giovanni, Terzani, Davide, Zonca, Fulvio   +5 more
core   +2 more sources

Magneto-acoustic Waves in a Magnetic Slab Embedded in an Asymmetric Magnetic Environment: The Effects of Asymmetry [PDF]

, 2018
Modeling the behavior of magnetohydrodynamic waves in a range of magnetic geometries mimicking solar atmospheric waveguides, from photospheric flux tubes to coronal loops, can offer a valuable contribution to the field of solar magneto-seismology.
Allcock M., Aschwanden M., Aschwanden M. J., Berukoff S., Crockett P. J., Cuntz M., De Pontieu B., Erdélyi R. ed Fletcher K., Fossum A., Fossum A., Liu Y., Matthew Allcock, Morton R. J., Noémi Kinga Zsámberger, Róbert Erdélyi, Solanki S. K., Sánchez Almeida J., Tritschler A., Wedemeyer-Böhm S.   +18 more
core   +1 more source

Topographic Drag at the Core‐Mantle Interface

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 4, April 2025.
Abstract The length of day variations with periods from five to one hundred years are mainly due to core‐mantle interactions. Assuming a differential velocity between the core and the mantle, we investigate the pressure coupling on a core‐mantle boundary (CMB) interface with topography. Including rotation, buoyancy, and magnetic effects in local models
R. Monville, D. Cébron, D. Jault
wiley   +1 more source

Interplay of Magnetic Reconnection and Current Sheet Kink Instability in the Earth's Magnetotail

Geophysical Research Letters, Volume 52, Issue 2, 28 January 2025.
Abstract Magnetic reconnection and current sheet kink instability often develop concurrently in current sheets, yet their dynamic interplay remains unclear. We investigate their interaction in the magnetotail of a 3D global magnetospheric hybrid‐Vlasov simulation. We identify the instability growth and saturation phase and estimate the evolution of the
G. Cozzani, M. Alho, I. Zaitsev, H. Zhou, S. Hoilijoki, L. Turc, M. Grandin, K. Horaites, M. Battarbee, Y. Pfau‐Kempf, U. Ganse, K. Papadakis, M. Palmroth   +12 more
wiley   +1 more source

Isotope impact on Alfvén eigenmodes and fast ion transport in DIII-D

Nuclear Fusion
Measurements of beam driven Alfvén Eigenmode (AE) activity in matched deuterium (D) and hydrogen (H) DIII-D plasmas show a dramatic difference in unstable mode activity and fast ion transport for a given injected beam power.
M.A. Van Zeeland, E. Bass, X.D. Du, W.W. Heidbrink, C. Chrystal, C. Crocker, G. DeGrandchamp, S. Haskey, D. Liu, J. Gonzalez-Martin, K.E. Thome, G. Yu, Y. Zhu   +12 more
doaj   +1 more source

Comprehensive evaluation of the linear stability of Alfvén eigenmodes driven by alpha particles in an ITER baseline scenario [PDF]

, 2018
The linear stability of Alfvén eigenmodes in the presence of fusion-born alpha particles is thoroughly assessed for two variants of an ITER baseline scenario, which differ significantly in their core and pedestal temperatures. A systematic approach based
Borba, D., Coelho, R., Fazendeiro, L., Ferreira, J., Figueiredo, A.C.A., Gomes Loureiro, Nuno F, Nabais, F., Pinches, S.D., Polevoi, A.R., Rodrigues, P., Sharapov, S.E.   +10 more
core   +1 more source

Ion‐Mediated Tearing and Kink Instabilities in the Earth's Magnetosphere: Hybrid‐Vlasov Simulations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract We explore the three‐dimensional structure of ion‐kinetic instabilities in a thin current layer using a hybrid‐Vlasov simulation of the Earth's magnetosphere. The simulation shows the simultaneous growth of tearing and kinking instabilities, which develop in the Sun‐Earth and dawn‐dusk directions, respectively, within the magnetotail current ...
I. Zaitsev, G. Cozzani, M. Alho, K. Horaites, H. Zhou, A. Kit, Y. Pfau‐Kempf, S. Hoilijoki, U. Ganse, M. Battarbee, K. Papadakis, J. Suni, M. Dubart, F. Tesema‐Kebede, A. Workayehu, V. Tarvus, L. Kotipalo, V. Koikkalainen, L. Turc, M. Palmroth   +19 more
wiley   +1 more source

Shear Alfvén waves within magnetic islands

Nuclear Fusion
We calculate Alfvén eigenmodes within a magnetic island (MiAE) which have been conjectured over a decade ago. Starting from a cylindrical plasma equilibrium, we calculate the complete metric of the island interior assuming an iota profile with a constant
Axel Könies, Jinjia Cao, Ralf Kleiber
doaj   +1 more source

Simulations of Alfvénic modes in TJ-II Stellarator [PDF]

, 2017
Alfvénic modes are one of the subclass of instabilities prevalent in burning plasmas due to interaction of energetic particles with background plasma.
Castejón, F., López-Fraguas, A., Mantsinen, M. J., Melnikov, A.V., Pablos, J.L. de, Rakha, Allah, Sharapov, S. E., Spong, D. A.   +7 more
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