Ballooning-mode theory of trapped-electron instabilities in tokamaks
نویسندگان
چکیده
منابع مشابه
Gyrokinetic Particle-In-Cell Global Simulations of Ion-Temperature-Gradient and Collisionless-Trapped- Electron-Mode Turbulence in Tokamaks
The goal of thermonuclear fusion research is to provide power plants, that will be able to produce one gigawatt of electricity. Among the different ways to achieve fusion, the tokamak, based on magnetic confinement, is the most promising one. A gas is heated up to hundreds of millions of degrees and becomes a plasma, which is maintained or confined in a toroidal vessel by helical magnetic field...
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It is shown that toroidal magnetic field ripple induced particle flux can drive poloidal E ×B speed to bifurcate over the local maximum of the nonlinear poloidal (or parallel) viscosity. Here, E is the electric field and B is the magnetic field. This mechansim, together with the turbulence suppression due to the radial gradient of the E ×B and diamagnetic angular velocity, is employed to explai...
متن کاملNonlinear saturation of ballooning modes in tokamaks and stellarators.
The spectral code BETAS computes plasma equilibrium in a toroidal magnetic field B = [unk]s x [unk]Psi with remarkable accuracy because the finite difference scheme employed in the radial direction allows for discontinuities of the flux function Psi across the nested surfaces s = const. Instability of higher modes in stellarators like the Heliotron E can be detected in roughly an hour on the be...
متن کاملNonlinear Stability and Saturation of Ballooning Modes in Tokamaks.
The theory of tokamak stability to nonlinear "ballooning" displacements of elliptical magnetic flux tubes is presented. Above a critical pressure profile the energy stored in the plasma may be lowered by finite (but not infinitesimal) displacements of such tubes (metastability). Above a higher pressure profile, the linear stability boundary, such tubes are linearly and nonlinearly unstable. The...
متن کاملDrift Ballooning Instabilities in Tokamak Edge Plasmas
The linear stability of high-toroidal-number drift-ballooning modes in tokamaks is investigated with a model that includes resistive and viscous dissipation, and assumes the mode frequency to be comparable to both the sound and diamagnetic frequencies. The coupled effect of ion drift waves and electron drift-acoustic waves is shown to be important, resulting in destabilization over an intermedi...
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ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 1981
ISSN: 0029-5515,1741-4326
DOI: 10.1088/0029-5515/21/3/009