Results 41 to 50 of about 2,920 (167)

Modelling the measured local time evolution of strongly nonlinear heat pulses in the Large Helical Device [PDF]

, 2013
In some magnetically confined plasmas, an applied pulse of rapid edge cooling can trigger either a positive or negative excursion in the core electron temperature from its steady state value.
Chapman, Sandra C., Dendy, R. O., Inagaki, S.   +2 more
core   +1 more source

Toward plasma drifts in EMC3: Implementation of gradient, divergence, and particle tracing schemes

Contributions to Plasma Physics, Volume 64, Issue 7-8, August-September 2024.
Abstract This paper presents a first implementation of gradient, divergence, and particle tracing schemes for the EMC3 code, a stochastic 3D plasma fluid code widely employed for edge plasma and impurity transport modeling in tokamaks and stellarators.
Ruben De Wolf, Felix Reimold, Yuhe Feng, Matthieu Jacobs, Wouter Dekeyser, Giovanni Samaey, Martine Baelmans   +6 more
wiley   +1 more source

Nonlinear growth of zonal flows by secondary instability in general magnetic geometry

, 2017
We present a theory of the nonlinear growth of zonal flows in magnetized plasma turbulence, by the mechanism of secondary instability. The theory is derived for general magnetic geometry, and is thus applicable to both tokamaks and stellarators.
Navarro, A. Bañón, Plunk, G. G.
core   +1 more source

Assessment of validity of local neoclassical transport theory for studies of electric-field root-transitions in the W7-X stellarator

Nuclear Fusion
The neoclassical ambipolarity condition governing the radial electric field in stellarators can have several solutions, and sudden transitions (in radius) between these can then take place. The radial position and structure of such a transition cannot be
M.D. Kuczyński, R. Kleiber, H.M. Smith, P. Helander, C.D. Beidler, M. Wappl, M. Borchardt, J. Geiger, S. Bozhenkov, A. Langenberg, T. Andreeva, the W7-X Team   +11 more
doaj   +1 more source

36. Theory of Stellar Atmospheres [PDF]

Transactions of the International Astronomical Union, 1970
This report has been prepared by the President with the assistance of the Vice-President, the Members of the Organizing Committee, V. V. Ivanov, P. Conti and of D. G. Hummer. The work of Commission 36 comes in contact with that of many commissions. Some subjects may be dealt with more fully in those reports; some subjects may have been “unlawfully ...
A. B. Underhill, R. Cayrel, K. H. Böhm, V. V. Ivanov, J. T. Jefferies, R. N. Thomas, S. Ueno   +6 more
openaire   +1 more source

Self-consistent, global, neoclassical radial-electric-field calculations of electron-ion-root transitions in the W7-X stellarator

Nuclear Fusion
The radial electric field in the Wendelstein 7-X stellarator is computed by means of self-consistent, global, neoclassical simulations using the gyrokinetic particle-in-cell code EUTERPE.
M.D. Kuczyński, R. Kleiber, H.M. Smith, C.D. Beidler, M. Borchardt, J. Geiger, P. Helander   +6 more
doaj   +1 more source

Impurity transport study based on measurement of visible wavelength high-n charge exchange transitions at W7-X

Nuclear Fusion
A recently installed high-speed charge exchange diagnostic at the W7-X stellarator has been used to identify several high-n Rydberg emission lines near 500 nm following impurity injections.
Colin Swee, Benedikt Geiger, Oliver Ford, Mark Nornberg, Martin O’Mullane, Peter Poloskei, Felix Reimold, Thilo Romba, Thomas Wegner, the W7-X Team   +9 more
doaj   +1 more source

Theory of Stellar and Extragalactic Jets [PDF]

International Astronomical Union Colloquium, 1986
AbstractDifferent types of astrophysical jets are briefly described and the wide differences in their observed properties are emphasized. Various physical mechanisms that have been proposed for creating jets, based on gas dynamical, magnetic, and radiative stresses are briefly reviewed. It is argued that magnetic fields are probably generally important
openaire   +2 more sources

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