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Theoretical study of electron-beam-heated carbon plasma C+++ emission (1989)

Whetstone, Shawn C. ; Kammash, Terry

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 65 (1989), S. 2152-2154

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The response of an electron beam heated carbon plasma is studied with particular attention given to Civ(C+++) line emission at 2530 A(ring) which has shown promise in plasma lasing schemes. A theoretical model which follows the plasma's hydrodynamics, ionization dynamics, and beam-plasma interactions is used to identify two distinct plasma responses which depend upon the heating rate. The response's difference is caused by variation of radiated power with plasma temperature and density. The model's predictions qualitatively agree with experimental observations at the University of Michigan.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.342869

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The theory and simulation of relativistic electron beam transport in the ion-focused regime (1992)

Swanekamp, Stephen B. ; Holloway, James Paul ; Kammash, Terry ; [weitere]

New York, NY : American Institute of Physics (AIP)

Physics of Fluids 4 (1992), S. 1332-1348

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Several recent experiments involving relativistic electron beam (REB) transport in plasma channels show two density regimes for efficient transport; a low-density regime known as the ion-focused regime (IFR) and a high-pressure regime. The results obtained in this paper use three separate models to explain the dependency of REB transport efficiency on the plasma density in the IFR. Conditions for efficient beam transport are determined by examining equilibrium solutions of the Vlasov–Maxwell equations under conditions relevant to IFR transport. The dynamic force balance required for efficient IFR transport is studied using the particle-in-cell (PIC) method. These simulations provide new insight into the transient beam front physics as well as the dynamic approach to IFR equilibrium. Nonlinear solutions to the beam envelope are constructed to explain oscillations in the beam envelope observed in the PIC simulations but not contained in the Vlasov equilibrium analysis. A test particle analysis is also developed as a method to visualize equilibrium solutions of the Vlasov equation. This not only provides further insight into the transport mechanism but also illustrates the connections between the three theories used to describe IFR transport. Separately these models provide valuable information about transverse beam confinement; together they provide a clear physical understanding of REB transport in the IFR.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.860088

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A Riemann solver for the two-dimensional MHD equations (1997)

Aslan, Necdet ; Kammash, Terry

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 25 (1997), S. 953-957

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ISSN: 0271-2091

Schlagwort(e): Reimann solver ; MHD equations ; shock compression ; Engineering ; Numerical Methods and Modeling

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Maschinenbau

Notizen: This paper presents how the equations of magnetohydrodynamics (MHD) in primitive form should be written in conservative form with the inclusion of a divergence source along with a divergence wave and how a physically correct sonic fix can be embedded directly in the fluxes. The numerical scheme was applied to a blast wave problem in which a circular energetic plasma is released in a free and magnetized medium with a reflected wall. The results show that the method with the new sonic fix can handle the divergence condition on the magnetic field and produces an almost uniform shock compression in all directions, resolving the shocks and discontinuities rather sharply. © 1997 John Wiley & Sons, Ltd.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

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