Time-filtering particle simulations with. omega. /sub p/e. delta. t>>1
The application of a time-filtering algorithm to particle simulations including low-frequency electron dynamics with time steps ..delta..t satisfying the condition ..omega../sub p/e..delta..t>>1, where ..omega../sub p/e denotes the electron plasma frequency, is presented. The implicit determination of the electric field required in these simulations is achieved by using the continuity and momentum equations in conjunction with the Poisson equation in a manner guaranteeing numerical stability for long wavelengths satisfying the condition k/sub max/v/sub the/..delta..t<<1, where k/sub max/ is the largest wave number included in the computations and v/sub the/ is the electron thermal velocity. Several classical examples, involving two-stream instabilities, ion-acoustic oscillations and plasma expansion into vacuum are given, and the effects of aliases and of beaming instabilities are analyzed.
- Research Organization:
- Lawrence Livermore Laboratory, University of California, Livermore, California 94550, and Department of Mechanical and Nuclear Engineering, Northwestern University, Evanston, Illinois, 60201
- OSTI ID:
- 6101685
- Journal Information:
- J. Comput. Phys.; (United States), Journal Name: J. Comput. Phys.; (United States) Vol. 41:1; ISSN JCTPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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ALGORITHMS
CONTINUITY EQUATIONS
DIFFERENTIAL EQUATIONS
DISPERSION RELATIONS
ELECTRIC FIELDS
EQUATIONS
EXPANSION
INSTABILITY
ION ACOUSTIC WAVES
ION WAVES
LANGMUIR FREQUENCY
MATHEMATICAL LOGIC
ONE-DIMENSIONAL CALCULATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
PLASMA SIMULATION
PLASMA WAVES
SIMULATION
TWO-STREAM INSTABILITY