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Hybrid simulation of electrode plasmas in high-power diodes
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10.1063/1.3270471
/content/aip/journal/pop/16/12/10.1063/1.3270471
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/12/10.1063/1.3270471
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The cathode plasma expansion model (see Ref. 7) with AK gap , applied voltage , and equilibrium current .

Image of FIG. 2.
FIG. 2.

The diode current in the planar diode for the all-fluid, all-kinetic, and hybrid simulations.

Image of FIG. 3.
FIG. 3.

The electron densities after 24 ns are plotted for (a) all-fluid case, (b) hybrid case for fluid electrons, (c) all-kinetic case, and (d) hybrid case for kinetic electrons.

Image of FIG. 4.
FIG. 4.

The electron temperatures after 24 ns are plotted for (a) all-fluid case, (b) hybrid case for fluid electrons, (c) all-kinetic case, and (d) hybrid case for kinetic electrons.

Image of FIG. 5.
FIG. 5.

The diode current for a series of all-kinetic simulations with varying cell size shown in the legend.

Image of FIG. 6.
FIG. 6.

The electron density from the all-kinetic simulation is plotted at 24 ns.

Image of FIG. 7.
FIG. 7.

The electrostatic potential on axis after 24 ns into the 31 kV/ns voltage rise simulations is plotted. In (a) the three plasma models were all-fluid, all-kinetic and hybrid. In (b) the all-kinetic simulation with varying resolution are plotted.

Image of FIG. 8.
FIG. 8.

The LSP simulation geometry for the SMP diode simulations is shown. An incoming TEM voltage wave is injected at the upper left. Regions of SCL emission of electrons from the cathode and ions from the anode as well as electrode plasma are outlined.

Image of FIG. 9.
FIG. 9.

For LSP electrode plasma simulations of a nominal 6 MV (8 ns rise time) SMP diode, the (a) diode impedance and the (b) ion current are plotted as a function of time. The “cathode” simulation includes cathode plasma with SCL emission of kinetic anode protons. The “anode” simulation includes anode plasma with SCL emission of kinetic cathode electrons.

Image of FIG. 10.
FIG. 10.

Using the hybrid electrode model, the particle densities in the SMP cathode plasma simulations are plotted at 10, 20, 30, and 40 ns. The top line shows the kinetic cathode electrons, the middle line plots the kinetic SCL emission anode ions, and the bottom line plots the fluid cathode ions.

Image of FIG. 11.
FIG. 11.

The electrostatic potential is plotted at 10 ns into the hybrid cathode plasma SMP simulation.

Image of FIG. 12.
FIG. 12.

Using the hybrid electrode model, the particle densities in the SMP anode plasma simulations are plotted at 10, 20, 30, and 40 ns. The top line shows the kinetic cathode electrons, the middle line plots the kinetic anode ions, and the bottom line plots the fluid anode ions.

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/content/aip/journal/pop/16/12/10.1063/1.3270471
2009-12-07
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hybrid simulation of electrode plasmas in high-power diodes
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/12/10.1063/1.3270471
10.1063/1.3270471
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