An Adiabatic Fluid Electron Particle-in-Cell Code for Simulating Ion-Driven Parametric Instabilities
✍ Scribed by H.X. Vu
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 797 KB
- Volume
- 124
- Category
- Article
- ISSN
- 0021-9991
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✦ Synopsis
rates on the electron time scale. If the electron time scale is the fastest time scale of the system, it is then appropriate A hybrid particle-in-cell (PIC) method is presented in which the electrons are modeled as an adiabatic fluid with an arbitrary ratio to use the time-explicit PIC algorithms because they of specific heats Ͳ. The electromagnetic field model is based are efficient and easy to use. The only constraint imposed on a temporal Wentzel-Krammers-Brillouin approximation. The by time-explicit algorithms is that one must resolve the method is a new tool for simulating ion-driven parametric instabilifastest time scale in order to achieve numerical stability.
ties which often exist in laser-produced plasmas. The method is However, this constraint places no additional burden on general and does not depend on the number of spatial dimensions. The method will model the plasma behavior correctly even in situaone's computing resources since one must, in this particular tions where the electron Debye shielding is not negligible. Test situation, resolve the fastest time scale in order to model simulations of ion Landau damping in both one and two dimensions the physics correctly. If, on the other hand, one wishes to are performed, and the results are in excellent agreement with linear model a physical process which varies on the ion time Vlasov theory. Test simulations of stimulated Brillouin scattering (SBS) in one and two dimensions are performed, and the results scale, either the time-implicit algorithms or the hybrid indicate that when the intensity of the driving electromagnetic field algorithms [21] may be appropriate, depending on whether is sufficiently high, backscatter SBS is dominant at early time while electron kinetic effects are deemed important.
side-scatter SBS is dominant at late time. For the test cases in which
In the presence of an external driving electromagnetic a high-frequency driving electromagnetic field is present, our hybrid wave, an additional time scale is introduced, i.e., the fre-PIC method offers a substantial saving in computational time over explicit PIC methods that require the time scale of the driving electro-quency of the external field. The time scale of the external magnetic field to be resolved.