Results 51 to 60 of about 2,917 (170)

Magnetic geometry effects on turbulent density fluctuations in Wendelstein 7-X

Nuclear Fusion
Line-integrated density fluctuation measurements from the core of the optimised stellarator Wendelstein 7-X (W7-X) are studied in the context of magnetic field geometry changes.
J.-P. Bähner, L. Podavini, A. Bañón Navarro, M. Porkolab, S.K. Hansen, E.M. Edlund, A. von Stechow, S.A. Bozhenkov, O.P. Ford, G. Fuchert, F. Jenko, A. Langenberg, N.A. Pablant, E. Pasch, P.Zs. Pölöskei, T. Romba, A. Zocco, O. Grulke, the W7-X Team   +18 more
doaj   +1 more source

A model for Alfvén-eigenmode-induced transport of fast ions in stellarators

Nuclear Fusion
A novel model for Alfvén-eigenmode-induced transport of fast ions in stellarators is introduced. A variety of reduced transport models exists for tokamaks, but nothing comparable currently exists for stellarators.
C. Slaby, R. Kleiber, A. Könies, M.I. Wolf, M. Borchardt   +4 more
doaj   +1 more source

Metamorphosis of plasma turbulence-shear flow dynamics through a transcritical bifurcation

, 2002
The structural properties of an economical model for a confined plasma turbulence governor are investigated through bifurcation and stability analyses.
A. E. Hubbard, A. Takayama, A. Thyagaraja, B. A. Carreras, D. Thomas, F. L. Hinton, F. Ryter, G. Hu, G. M. Staebler, H. Dahi, H. R. Strauss, H. R. Strauss, H. Sugama, H. Sugama, H. Sugama, H. Sugama, H. Sugama, H. Zohm, I. A. Vojtsekhovich, I. N. James, J. F. Drake, J. W. Connor, K. H. Burrell, K. Ida, M. G. Shats, M. G. Shats, M. G. Shats, M. Hirsch, M. Hirsch, O. Pogutse, P. E. Bak, P. H. Diamond, P. W. Terry, R. A. Moyer, R. Ball, R. Ball, R. Ball, R. E. Bell, R. L. Dewar, S.-I. Itoh, S.-I. Itoh, T. H. Stix, V. B. Lebedev, W. Suttrop, Y. Igitkhanov   +44 more
core   +1 more source

Oscillatory relaxation of zonal flows in a multi-species stellarator plasma

, 2018
The low frequency oscillatory relaxation of zonal potential perturbations is studied numerically in the TJ-II stellarator (where it was experimentally detected for the first time).
Alonso, A., Calvo, I., Kleiber, R., Medina, F., Monreal, P., Sánchez, E., team, the TJ-II, Velasco, J. L.   +7 more
core   +1 more source

An Overview of Stellar Pulsation Theory [PDF]

Astrophysics and Space Science, 1993
AbstractIn this paper I will give overview of the stellar pulsation theory. Starting with basic equations I will discuss modal properties of oscillations and excitation mechanisms. I also mention briefly the effects of rotation.
openaire   +1 more source

The level of non-thermal velocity fluctuations deduced from Doppler spectroscopy and its role on TJ-II confinement

, 2009
The goal of this investigation is to study, in the line of previous works, the level of velocity fluctuations in different scenarios of the TJ-II stellarator.
Baciero, Dinklage, Landi, McCarthy, Rapisarda, Rapisarda, Zurro   +6 more
core   +1 more source

Theory, Observation and Experiment: Stellar Hydrodynamics [PDF]

Symposium - International Astronomical Union, 1997
Computer technology now allows two dimensional (2D) simulations, with complex microphysics, of stellar hydrodynamics and evolutionary sequences, and holds the promise for 3D. Careful validation of astrophysical methods, by laboratory experiment, by critical comparison of numerical and analytical methods, and by observation are necessary for the ...
openaire   +1 more source

Noise-driven evolution in stellar systems - I. Theory [PDF]

Monthly Notices of the Royal Astronomical Society, 2001
10 pages, no figures, uses mn ...
openaire   +3 more sources

Dynamics of zonal flow-like structures in the edge of the TJ-II stellarator

, 2012
The dynamics of fluctuating electric field structures in the edge of the TJ-II stellarator, that display zonal flow-like traits, is studied. These structures have been shown to be global and affect particle transport dynamically [J.A. Alonso et al., Nucl.
Alonso J, B Ph Van Milligen, C Hidalgo, C Silva, D Carralero, Helander P, Hidalgo C, J A Alonso, J Arévalo, J L Velasco, M A Pedrosa, Motojima O, Pedrosa M A, Scott B, Tala T, Velasco J, Velasco J, Velasco J L Arévalo J Alonso J A, Wobig H, Wobig H, Xu Y   +20 more
core   +1 more source

Wolf-Rayet Stellar Wind Theory [PDF]

Symposium - International Astronomical Union, 1991
Two possible solutions to the Wolf-Rayet wind momentum problem are discussed: purely radiation driven wind theory, with multi-line effects, and Luminous Magnetic Rotator theory. Several recently developed radiative processes for enhancing M or v∞ are described, and it is concluded that only the winds of rather hot luminous Wolf-Rayet stars could ...
openaire   +1 more source