Alpha particle destabilization of the toroidicity‐induced Alfvén eigenmodes
نویسندگان
چکیده
منابع مشابه
Radial localization of toroidicity-induced Alfvén eigenmodes.
Linear gyrokinetic simulation of fusion plasmas finds a radial localization of the toroidal Alfvén eigenmodes (TAEs) due to the nonperturbative energetic particle (EP) contribution. The EP-driven TAE has a radial mode width much smaller than that predicted by the magnetohydrodynamic theory. The TAE radial position stays around the strongest EP pressure gradients when the EP profile evolves. The...
متن کاملObservation of odd toroidal Alfvén eigenmodes.
Experimental evidence is presented for the existence of the theoretically predicted odd toroidicity induced Alfvén eigenmode (TAE) from the simultaneous appearance of odd and even TAEs in a normal shear discharge of the joint European torus. The modes are observed in low central magnetic shear plasmas created by injecting lower hybrid current drive. A fast ion population was created by applying...
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The achievement of sustained nuclear fusion in magnetically confined plasma relies on efficient confinement of alpha particles, which are high-energy ions produced by the fusion reaction. Such particles can excite instabilities in the frequency range of Alfvén Eigenmodes (AEs), which significantly degrade their confinement and threatens the vacuum vessel of future reactors. In order to develop ...
متن کاملNonlinear excitations of zonal structures by toroidal Alfvén eigenmodes.
Zonal flows and, more generally, zonal structures are known to play important self-regulatory roles in the dynamics of microscopic drift-wave-type turbulences. Since toroidal Alfvén eigenmode (TAE) plays crucial roles in the Alfvén wave instabilities in burning fusion plasmas, it is, thus, important to understand and assess the possible roles of zonal flow and structures on the nonlinear dynami...
متن کاملHigh-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...
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ژورنال
عنوان ژورنال: Physics of Fluids B: Plasma Physics
سال: 1991
ISSN: 0899-8221
DOI: 10.1063/1.859618