Hybrid simulation of electrode plasmas in high-power diodes
- Voss Scientific, LLC, 418 Washington St., Albuquerque, New Mexico 87108 (United States)
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
New numerical techniques for simulating the formation and evolution of cathode and anode plasmas have been successfully implemented in a hybrid code. The dynamics of expanding electrode plasmas has long been recognized as a limiting factor in the impedance lifetimes of high-power vacuum diodes and magnetically insulated transmission lines. Realistic modeling of such plasmas is being pursued to aid in understanding the operating characteristics of these devices as well as establishing scaling relations for reliable extrapolation to higher voltages. Here, in addition to kinetic and fluid modeling, a hybrid particle-in-cell technique is described that models high density, thermal plasmas as an inertial fluid which transitions to kinetic electron or ion macroparticles above a prescribed energy. The hybrid technique is computationally efficient and does not require resolution of the Debye length. These techniques are first tested on a simple planar diode then applied to the evolution of both cathode and anode plasmas in a high-power self-magnetic pinch diode. The impact of an intense electron flux on the anode surface leads to rapid heating of contaminant material and diode impedance loss.
- OSTI ID:
- 21371254
- Journal Information:
- Physics of Plasmas, Vol. 16, Issue 12; Other Information: DOI: 10.1063/1.3270471; (c) 2009 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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NUMERICAL ANALYSIS
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PLASMA SIMULATION
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