Author: Arthur F. KuckesPublisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
Interchange Instability in a Hot Electron Plasma
Author: Arthur F. KuckesObservation 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
Flute-interchange Stability in a Hot Electron Plasma
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Several topics in the kinetic stability theory of flute-interchange modes in a hot electron plasma are discussed. The stability analysis of the hot-electron, curvature-driven flute-interchange mode, previously performed in a slab geometry, is extended to a cylindrical plasma. The cold electron concentration necessary for stability differs substantially from previous criteria. The inclusion of a finite temperature background plasma in the stability analysis results in an ion curvature-driven flute-interchange mode which may be stabilized by either hot-electron diamagnetic effects, hot-electron plasma density, or finite (ion) Larmor radius effects.
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.
Instabilities in a Hot Electron Plasma
Author: Marvin Jack SchwartzPublisher:
ISBN:
Category :
Languages : en
Pages : 256
Book Description
The Influence of a Hot Particle Component on Plasma Stability
Author: Adel M. El-NadiPublisher:
ISBN:
Category : Equilibrium
Languages : en
Pages : 22
Book Description
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.
Anisotropy Effects on Curvature-driven Flute Instabilities in a Hot-electron Plasma
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The effects of finite parallel temperature are investigated for a hot electron plasma with sufficiently large beta that the magnetic field scale length (.delta./sub B/) is small compared with the vacuum field radius of curvature (R). Numerical and analytical estimates of stability boundaries are obtained for the four possible modes that can be treated in this limit: the conventional hot electron interchange, the high frequency hot electron interchange (.omega.> .omega./sub ci/), the compressional Alfven mode, and the interacting pressure-driven interchange.
High-frequency Instability of a Hot-electron Plasma Generated by Electron-cyclotron Resonance
Author: Carlton Edward SpeckPublisher:
ISBN:
Category :
Languages : en
Pages : 584
Book Description
Electron Cyclotron Heating of Plasmas
Author: Gareth GuestPublisher: John Wiley & Sons
ISBN: 9783527627899
Category : Science
Languages : en
Pages : 264
Book Description
Authored by a highly regarded plasma scientist, this book fills the gap for a topical reference and source with a professional audience in mind. While the use of this critical method at the international fusion reactor, ITER, is covered in detail, the monograph also includes planetary magnetospheres and plasma sources for commercial applications. With exercises and solutions for additional use as course reading.