13 Matching Results

Search Results

Advanced search parameters have been applied.
in publisher: "University of Texas at Austin. Institute for Fusion Studies."  
Results: 1 - 13
open access

Magnetic fusion with high energy self-colliding ion beams

Description: Field-reversed configurations of energetic large orbit ions with neutralizing electrons have been proposed as the basis of a fusion reactor. Vlasov equilibria consisting of a ring or an annulus have been investigated. A stability analysis has been carried out for a long thin layer of energetic ions in a low density background plasma. There is a growing body of experimental evidence from tokamaks that energetic ions slow down and diffuse in accordance with classical theory in the presence of lar… more
Date: June 1, 1992
Creator: Rostoker, N.; Wessel, F. (California Univ., Irvine, CA (United States)); Maglich, B. (Advanced Physics Corp., Irvine, CA (United States)) & Fisher, A. (Naval Research Lab., Washington, DC (United States))
Partner: UNT Libraries Government Documents Department
open access

Study of Resistive Pressure-Gradient-Driven Turbulence

Description: Previous studies have shown the resistive pressure-gradient-driven turbulence (RPGDT) is a likely cause of observed turbulent fluctuations and anomalous transport in magnetically confined plasmas. More recent study of RPGDT found a true saturation criterion and predicted significantly larger pressure diffusivity over simple mixing-length estimate. In this study, we investigate wavenumber spectrum for more detailed characteristics of this driven turbulence and consider an electromagnetic model w… more
Date: January 1, 1987
Creator: Lee, G. S.; Garcia, L.; Carreras, B. A. & Diamond, P. H.
Partner: UNT Libraries Government Documents Department
open access

Ion kinetic effects on the tilt mode in FRCs

Description: Theory and simulations have shown that field reversed configurations (FRG's) should be unstable magnetohydrodynamically to the tilting mode, yet tilting seldom is seen in the experiments. Profile effects (within MHD) and ion finite larmor radius (FLR) effects have been prosed to explain the observed stability of FRC's. The present work seeks to test both of these effects.
Date: January 1, 1981
Creator: Schwarzmeier, J. L.; Seyler, C. E. & Barnes, D. C.
Partner: UNT Libraries Government Documents Department
open access

1991 US-Japan workshop on Nuclear Fusion in Dense Plasmas

Description: The scientific areas covered at the Workshop may be classified into the following subfields: (1) basic theory of dense plasma physics and its interface with atomic physics and nuclear physics; (2) physics of dense z-pinches, ICF plasmas etc; (3) stellar interior plasmas; (4) cold fusion; and (5) other dense plasmas.
Date: October 1991
Creator: Ichimaru, S. & Tajima, T.
Partner: UNT Libraries Government Documents Department
open access

Summary of the international Dawson' Symposium on the physics of plasmas

Description: The Dawson'' Symposium was held on September 24 and 25, 1990 in honor of John Dawson's 60th birthday to reflect on various physics of plasma that he had pioneered. The international speakers touched on a wide range of subjects: magnetic fusion, laser fusion, isotope separation, computer simulation, basic plasma physics, accelerators and light sources, space physics, and international scientific collaboration. Highlighted in this article are magnetic fusion and laser fusion investigation that Da… more
Date: December 1, 1990
Creator: Tajima, T.
Partner: UNT Libraries Government Documents Department
open access

Analytical and numerical calculations of field-reversed theta-pinch equilibria based on a generalized Hill's vortex model

Description: We have been investigating methods for numerically extending the analytic solutions of field reversed theta pinch equilibria so that the results may be used in various stability and dynamics studies. We have used generalizations of elliptical Hill's vortex equilibria which accomodate separatrices with more rectangular shapes and which allow plasma to exist outside the separatrix. Although the equilibria are specified analytically inside the plasma surface, numerical techniques are required to g… more
Date: October 1, 1981
Creator: Anderson, D. V.; Hammer, J. H. & Barnes, D. C.
Partner: UNT Libraries Government Documents Department
open access

Particle Simulations in Toroidal Geometry

Description: A computational tool to be used in kinetic simulations of toroidal plasmas is being developed. The initial goal of the project is to develop an electrostatic gyrokinetic model for studying transport and stability problems in tokamaks. In this brief report, preliminary results from the early stages of this effort are presented.
Date: September 1, 1992
Creator: Aydemir, A. Y.
Partner: UNT Libraries Government Documents Department
open access

Curvature-driven instabilities in the Elmo Bumpy Torus (EBT)

Description: Curvature-driven instabilities are analyzed for an EBT configuration which consists of plasma interacting with a hot electron ring whose drift frequencies are larger than the growth rates predicted from conventional magnetohydrodynamic (MHD) theory. Stability criteria are obtained for five possible modes: the conventional hot electron interchange, a high-frequency hot electron interchange (at frequencies greater than the ion-cyclotron frequency), a compressional instability, a background plasma… more
Date: January 1, 1982
Creator: Abe, H.; Spong, D. A.; Antonsen, T. M. Jr.; Tsang, K. T. & Nguyen, K. T.
Partner: UNT Libraries Government Documents Department
open access

Particle simulations in toroidal geometry

Description: A computational tool to be used in kinetic simulations of toroidal plasmas is being developed. The initial goal of the project is to develop an electrostatic gyrokinetic model for studying transport and stability problems in tokamaks. In this brief report, preliminary results from the early stages of this effort are presented.
Date: September 1, 1992
Creator: Aydemir, A. Y.
Partner: UNT Libraries Government Documents Department
open access

Magnetic fusion with high energy self-colliding ion beams

Description: Field-reversed configurations of energetic large orbit ions with neutralizing electrons have been proposed as the basis of a fusion reactor. Vlasov equilibria consisting of a ring or an annulus have been investigated. A stability analysis has been carried out for a long thin layer of energetic ions in a low density background plasma. There is a growing body of experimental evidence from tokamaks that energetic ions slow down and diffuse in accordance with classical theory in the presence of lar… more
Date: June 1, 1992
Creator: Rostoker, N.; Wessel, F.; Maglich, B. & Fisher, A.
Partner: UNT Libraries Government Documents Department
open access

Nonlinear evolution of current driven instabilities in a reversed field pinch configuration

Description: Plasmas can be confined in a toroidal configuration using magnetic fields generated by external coils and internal plasma currents. In a toroidal configuration, the magnetic field line equations constitute a Hamiltonian system with one and one-half degrees of freedom. This fact establishes a simple correspondence between a toroidal magnetic field and a nonlinear Hamiltonian system. This correspondence equates magnetic field lines in real space to orbits of the Hamiltonian system in phase space,… more
Date: January 1, 1986
Creator: Carreras, B. A.; Holmes, J. A. & Diamond, P. H.
Partner: UNT Libraries Government Documents Department
open access

Kinetic theory of toroidicity and ellipticity-induced Alfven eigenmodes

Description: Toroidicity-induced Alfven eigenmodes (TAE) and ellipticity-induced Alfven eigenmodes (EAE) are currently of great interest because they may destroy the confinement of fast ions in a burning tokamak plasma. The present study focuses on kinetic effects, extending the non-perturbative kinetic analysis of the TAE to the EAE. One finds that the parameter which measures the kinetic character of the EAE is significantly smaller than it is for the TAE for elongated plasmas like DIII-D. The parameter i… more
Date: October 1, 1992
Creator: Mett, R. R. & Mahajan, S. M.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen