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), Vol. 41:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ION ACOUSTIC WAVES
PLASMA SIMULATION
ALGORITHMS
TWO-STREAM INSTABILITY
CONTINUITY EQUATIONS
DISPERSION RELATIONS
ELECTRIC FIELDS
EXPANSION
LANGMUIR FREQUENCY
ONE-DIMENSIONAL CALCULATIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
INSTABILITY
ION WAVES
MATHEMATICAL LOGIC
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
PLASMA WAVES
SIMULATION
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