### Session NO2: Advances in Plasma Simulation II

9:30 AM–12:30 PM, Wednesday, November 1, 2006
Philadelphia Marriott Downtown Room: Grand Salon H

Chair: Andris Dimits, Lawrence Livermore National Laboratory

Abstract ID: BAPS.2006.DPP.NO2.8

### Abstract: NO2.00008 : On a Primal Coarse Projective Integration Method for Multiscale Simulations

10:54 AM–11:06 AM

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#### Authors:

Milos Skoric
Seiji Ishiguro
(National Institute for Fusion Science, Japan)

Sandra Maluckov
(University of Nis, Serbia)

A novel simulation framework called Equation-Free Projective Integration (EFPI) was recently applied to nonlinear plasmas by M. Shay [1] to study propagation and steepening of a 1D ion sound (IS) with a PIC code as a microscopic simulator. To initialize, macro plasma variables are lifted'' to a fine micro-representation. PIC code is stepped forward for a short time, and the results are restricted'' or smoothed back to macro space. By extrapolation, time derivative is estimated and projected with a large step; the process is repeated. As a simple alternative, we propose a sort of a primal EPFI scheme to simulate nonlinear plasmas including kinetic effects. The micro-simulator is a standard 1D ES PIC code. Ions are assumed inherently coarse grained or smoothed'' and tracked to extrapolate in time and project. The potential is averaged over the electron plasma period to extrapolate and project. No adiabatic approximation for electrons is used [2], instead, self-consistently find the non-uniform electron distribution from the Poisson equation and ion density. Preliminary results for nonlinear IS as well as for the IS double layer paradigm are presented and some limitations on the EPFI discussed. [1] M. Shay, J. Drake, W. Dorland, J. of Comp. Phys (APS DPP 2005) [2] G. Stanchev, A. Maluckov et al., in EPS Fusion (Rome, 2006).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.DPP.NO2.8