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in subjects: "Ballooning Instability"  
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Tandem mirror reactor with thermal barriers

Description: This report gives detailed information in the form of the following chapters: (1) overview, (2) plasma physics, (3) magnets, (4) end-plug neutral beams, (5) barrier pump neutral beams, (6) ecr heating, (7) plasma direct converter, and (8) central cell. (MOW)
Date: September 19, 1979
Creator: Carlson, G. A.; Arfin, B.; Barr, W. L.; Boghosian, B. M.; Erickson, J. L.; Fink, J. H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Stability of the plasma in a bundle divertor

Description: Due to the pressure and magnetic field gradients and curvature of the magnetic field lines in a bundle divertor of a tokamak device, the plasma may be unstable to local interchange modes. Turbulent transport could be quite large and lead to a thick scrape-off layer which is as large as the radius of curvature of the diverted flux bundle. Such turbulence would be beneficial for lowering the energy and particle fluxes on the collector in a bundle divertor. The effect of a bundle divertor on the .… more
Date: February 1, 1979
Creator: Yang, T. F. & Callen, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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WKB theory for high-n modes in axisymmetric toroidal plasmas

Description: It is demonstrated that the low-frequency, k/sub parallel//k/sub perpendicular/ approx. = 0 normal modes of an axisymmetric plasma, at large but finite toroidal mode number n, can be obtained by solving a novel WKB problem involving an infinite number of branches. Formulae for the frequencies of periodic normal modes are derived. The analysis is performed in the context of an ideal MHD model, and comparison is made with numerical ballooning mode results.
Date: September 1, 1979
Creator: Dewar, R. L.; Chance, M. S.; Glasser, A. H.; Greene, J. M. & Frieman, E. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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General theory of kinetic ballooning modes

Description: The ballooning mode formalism, previously developed for the ideal MHD problem, is applied here to the kinetic problem in tokamaks. The general two-dimensional equation governing drift and trapped-electron eigenmodes reduces to a one-dimensional integral equation along the lines of force with the radial structure determined by a WKB procedure. Comparisons made between the present one-dimensional code and a previous two-dimensional code embodying identical physical assumptions indicate reasonable… more
Date: October 1, 1979
Creator: Frieman, E.A.; Rewoldt, G.; Tang, W.M. & Glasser, A.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theory of drift-wave eigenmodes in toroidal plasmas

Description: The eigenmode equation describing ballooning drift waves in toroidal plasmas is analyzed using the WKB method. Two branches of eigenmodes are identified. One is slab-like and the other is a new branch induced by the finite toroidicity. The slab-like eigenmodes correspond to unbounded states and experience finite shear damping. The toroidicity-induced eigenmodes, however, correspond to local quasibounded states with negligible shear damping. Both branches of eigenmodes may exist simultaneously. … more
Date: July 1, 1979
Creator: Chen, L. & Cheng, C. Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Unstable universal drift eigenmodes in toroidal plasmas

Description: The eigenmode equation describing ballooning collisionless drift instabilities is analyzed both analytically and numerically. A new branch of eigenmodes, which corresponds to quasi-bound states due to the finite toroidicity, is shown to be destabilized by electron Landau damping for typical Tokamak parameters. This branch cannot be understood by the strong coupling approximation. However, the slab-like (Pearlstein-Berk type) branch is found to remain stable and experience enhanced shear damping… more
Date: August 1, 1979
Creator: Cheng, C. Z. & Chen, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ballooning-mode theory of trapped-electron instabilities in tokamaks

Description: Employing the ballooning-mode formalism, the two-dimensional eigenmode equation for trapped-electron instabilities in tokamaks is reduced to a one-dimensional integro-differential equation along the magnetic field lines; which is then analyzed both analytically and numerically. Dominant toroidal coupling effects are due to ion magnetic drifts which create quasi-bounded states. The trapped-electron response can be treated as perturbation and is found to destablize the quasi-bounded states.
Date: December 1, 1979
Creator: Cheng, C. Z. & Chen, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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