Author: Eugenio Enrique OrtizPublisher:
ISBN:
Category :
Languages : en
Pages : 240
Book Description
Observation of the Hot Electron Interchange Instability in a High Beta Dipolar Confined Plasma
Author: Eugenio Enrique OrtizPublisher:
ISBN:
Category :
Languages : en
Pages : 240
Book Description
Observation of a Mirror-Like Instability in a Hot-Electron Plasma
Author: Interchange Instability in a Hot Electron Plasma
Author: Arthur F. KuckesStability Analysis of a Hot Electron EBT Plasma
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Previous theoretical studies have predicted that an EBT-confined plasma will have a stable equilibrium for beta values of the toroidal core plasma comparable to the beta value for the hot electron annulus. We show that, when the ring is allowed to be perturbed, there is a new physical effect, enhanced compression of the core plasma; that in the limit of negligible .beta./sub core/, the interchange mode is stable for .beta./sub ring/ greater than about 20%, as was found before; but that when the core pressure is increased, the plamsa goes unstable again at values of .beta./sub core/ significantly smaller than the value for .beta./sub ring.
Nuclear Science Abstracts
Author: Energy Research Abstracts
Author: Stability Analysis for Resistive Interchange Instability of High Beta Plasma
Author: Benjamin M. MaPlasma Physics Reports
Author: Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 604
Book Description
Publishes papers on plasma physics. The journal covers the following topics: high-temperature plasma physics, connected with the problem of controlled nuclear fusion based on magnetic and inertial confinement; physics of cosmic plasma including magnetosphere plasma, sun and stellar plasma, etc.; gas discharge plasma and plasma generated by laser and particle beams.
Effects of Hot Electrons on the Stability of a Closed Field Line Plasma
Author: Natalia S. KrasheninnikovaPublisher:
ISBN:
Category :
Languages : en
Pages : 74
Book Description
Motivated by the electron cyclotron heating being employed on the dipole experiments, the effects of a hot species on stability in closed magnetic field line geometry are investigated by considering a Z-pinch plasma. The interchange stability of a plasma of background electrons and ions with a small fraction of hot electrons is considered. The species diamagnetic drift and magnetic drift frequencies are assumed to be of the same order, and the wave frequency is assumed to be much larger than the background, but much less than the hot drift frequencies. An arbitrary total pressure dispersion relation is obtained, with the background plasma treated as a single fluid, while a fully kinetic description is employed for the hot species. The analysis of the dispersion relation shows that two different kinds of resonant hot electron effects modify the simple MHD interchange stability condition. When the azimuthal magnetic field increases with radius, there is a critical pitch angle above which the magnetic drift of the hot electrons reverses. The interaction of the wave with the hot electrons with pitch angles near this critical value always results in instability. When the magnetic field decreases with radius, magnetic drift reversal is not possible and only low speed hot electrons will interact with the wave. Destabilization by this weaker resonance effect can be avoided by carefully controlling the hot electron density and temperature profiles.
Radial Structure of Curvature-driven Instabilities in a Hot-electron Plasma
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A nonlocal analysis of curvature-driven instabilities for a hot electron ring interacting with a warm background plasma has been made. We have examined four different instability modes characteristic of hot electron plasmas: the high-frequency hot electron interchange (at frequencies larger than the ion cyclotron frequency), the compressional Alfven instability, the interacting background pressure-driven interchange, and the conventional hot electron interchange (at frequencies below the ion cyclotron frequency). We have also examined the decoupling condition between core and hot electron plasmas as it influences the background and hot electron interchange stability requirements. The assumed equilibrium plasma profiles and resulting radial mode structure differ somewhat from those used in previous local analytic estimates; however, when the analysis is calibrated to the appropriate effective radial wavelength of the nonlocal calculation, reasonable agreement is obtained. Comparison with recent experimental measurements indicates that certain of these modes may play a role in establishing operating boundaries for the ELMO Bumpy Torus-Scale (EBT-S) experiment.