Results 51 to 60 of about 249 (184)

Reduced electrostatic turbulence in the quasi-isodynamic stellarator configuration CIEMAT-QI4

Nuclear Fusion
CIEMAT-QI4 is a quasi-isodynamic stellarator configuration that simultaneously features very good fast-ion confinement in a broad range of β values, low neoclassical transport and bootstrap current, and ideal magnetohydrodynamic stability up to $\beta ...
J.M. García-Regaña, I. Calvo, E. Sánchez, H. Thienpondt, J.L. Velasco, J.A. Capitán   +5 more
doaj   +1 more source

Boundary turbulence simulations of the optimized HSX stellarator and comparison with experiments

Nuclear Fusion
We present the first-ever full- $f$ , three-dimensional, two-fluid simulation of plasma turbulence based on the drift-reduced Braginskii equations in the optimized Helically Symmetric eXperiment (HSX) stellarator in its quasi-helical configuration.
Z. Tecchiolli, L. Da Silva, J. Loizu, D. Boeyaert, A. Wolfmeister, W. Guttenfelder, P. Ricci, N. Nikulsin, B. De Lucca, D. Mancini   +9 more
doaj   +1 more source

Model for second harmonic ECRH plasma start-up in stellarators

Nuclear Fusion
Plasma ionisation avalanche under constant electric field is well described by classical theory. It is the standard tokamak start-up method. In this work, we investigate an analogous avalanche process driven by electron cyclotron resonance (ECR). This is
C. Albert Johansson, Pavel Aleynikov, Alvaro Cappa, the W7-X Team   +3 more
doaj   +1 more source

Stellar Prominences [PDF]

Symposium - International Astronomical Union, 1996
I review recent observational and theoretical progress in the study of condensations of cool material trapped in the coronae of rapidly rotating stars. Such condensations were discovered over a decade ago, producing transient moving absorption features in the optical Balmerseries lines.
openaire   +2 more sources

Stellar atmospheres

This is a pre-print of a chapter for the Encyclopedia of Astrophysics (edited by I. Mandel, section editor F.R.N.
Puls, Joachim, Herrero, Artemio, Prieto, Carlos Allende   +2 more
openaire   +2 more sources

Multiscale turbulence in stellarators

Nuclear Fusion
We present the first gyrokinetic simulations of multiscale turbulence in a stellarator, using the magnetic geometry of Wendelstein 7-X (W7-X) and experimentally relevant parameters. A broad range of scenarios is explored, including regimes where electron-
G. Merlo, A. Bañón Navarro, T. Görler, F. Jenko, F. Wilms   +4 more
doaj   +1 more source

Filament simulations for stellarators; a review of recent progress

Frontiers in Physics
A review of recent advances in simulations of turbulent filaments with relevance to stellarators is presented. Progress in performing global edge turbulence simulations is discussed as well as results from seeded filament simulations with applications to
Brendan Shanahan
doaj   +1 more source

Stellar populations

, 2013
This is a summary of my lectures during the 2011 IAC Winter School in Puerto de la Cruz. I give an introduction to the field of stellar populations in galaxies, and highlight some new results. Since the title of the Winter School was {\it Secular Evolution of Galaxies} I mostly concentrate on nearby galaxies, which are best suited to study this theme ...
openaire   +3 more sources

On Stellar Rotation.

The Astrophysical Journal, 1942
Not ...
openaire   +1 more source

Global linear drift-wave eigenmode structures on flux surfaces in stellarators: ion temperature gradient mode

Nuclear Fusion
Turbulent transport greatly impacts the performance of stellarator magnetic confinement devices. While significant progress has been made on the numerical front, theoretical understanding of turbulence in stellarators is still lacking. In particular, due
Hongxuan Zhu, H. Chen, Z. Lin, A. Bhattacharjee   +3 more
doaj   +1 more source