Saturation of energetic particle driven Alfven wave instability through velocity space diffusion
نویسندگان
چکیده
منابع مشابه
High-ti Stability of Alpha Particle Driven Alfven Eigenmodes
In the present work, we analyse the two dimensional (2-D) mode structures and global stability of the Alfvkn branches, whose frequencies are close to the toroidicity induced A1fv.h continuum gap. The fully 2-D problem is solved using a two spatial-scale WKBJ formalism without employing perturbation theory in treating drive and damping terms. A code that solves the 2-D mode structures and global...
متن کاملVelocity-Space Diffusion in a Perpendicularly Propagating Electrostatic Wave
The motion of ions in the fields B = B0ẑ and E = E0ŷ cos(k⊥y−ωt) is considered. When ω ≫ Ωi and v⊥ ∼> ω/k⊥, the equations of motion may be reduced to a set of difference equations. These equations exhibit stochastic behavior when E0 exceeds a threshold. The diffusion coefficient above the threshold is determined. Far above the threshold, ion Landau damping is recovered. Extension of the method ...
متن کاملParticle simulation of energetic particle driven Alfvén modes
The results of hybrid MHD-particle simulations of the Alfvén mode dynamics in a reversed-shear beam-heated DIII-D discharge are reported and compared with the experimental observations. Specific attention is devoted to the inclusion, in the numerical model, of nonlinear coupling between different toroidal mode numbers.
متن کاملParticle simulation of energetic particle driven Alfv19 en modes
The mutual nonlinear interactions of shear Alfvén modes and alpha particles can enhance their transport in burning plasmas. Theoretical and numerical works have shown that rapid transport of energetic ions can take place because of fast growing Alfvén modes (e.g. energetic particle driven modes, EPMs). This kind of transport has been observed in experiments as well as in numerical simulations. ...
متن کاملDiffusion-Driven Instability in Reaction Diffusion Systems
For a stable matrix A with real entries, sufficient and necessary conditions for A D to be stable for all non-negative diagonal matrices D are obtained. Implications of these conditions for the stability and instability of constant steadystate solutions to reaction diffusion systems are discussed and an example is given to show applications. 2001 Academic Press
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters A
سال: 1992
ISSN: 0375-9601
DOI: 10.1016/0375-9601(92)91084-5