000188917 001__ 188917
000188917 005__ 20190316235715.0
000188917 0247_ $$2doi$$a10.1063/1.4794346
000188917 022__ $$a1070-664X
000188917 02470 $$2ISI$$a000317295200008
000188917 037__ $$aARTICLE
000188917 245__ $$aElectron and ion kinetic effects on non-linearly driven electron plasma and ion acoustic waves
000188917 260__ $$aMelville$$bAmer Inst Physics$$c2013
000188917 269__ $$a2013
000188917 300__ $$a30
000188917 336__ $$aJournal Articles
000188917 520__ $$aFully non-linear kinetic simulations of electron plasma and ion acoustic waves (IAWs) have been carried out with a new multi-species, parallelized Vlasov code. The numerical implementation of the Vlasov model and the methods used to compute the wave frequency are described in detail. For the first time, the nonlinear frequency of IAWs, combining the contributions from electron and ion kinetic effects and from harmonic generation, has been calculated and compared to Vlasov results. Excellent agreement of theory with simulation results is shown at all amplitudes, harmonic generation being an essential component at large amplitudes. For IAWs, the positive frequency shift from trapped electrons is confirmed and is dominant for the effective electron-to-ion temperature ratio, Z T-e/T-i greater than or similar to 10 with Z as the charge state. Furthermore, numerical results demonstrate unambiguously the dependence [R. L. Dewar, Phys. Fluids 15, 712 (1972)] of the kinetic shifts on details of the distribution of the trapped particles, which depends in turn on the conditions under which the waves were generated. The trapped particle fractions and energy distributions are derived and, upon inclusion of harmonic effects, shown to agree with the simulation results, completing a consistent picture. Fluid models of the wave evolution are considered but prove unable to capture essential details of the kinetic simulations. Detrapping by collisions and sideloss is also discussed. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4794346]
000188917 700__ $$aBerger, R. L.$$uLawrence Livermore Natl Lab, Livermore, CA 94551 USA
000188917 700__ $$aBrunner, S.$$uEcole Polytech Fed Lausanne, Ctr Rech Phys Plasmas, Assoc Euratom Confederat Suisse, CRPP PPB, CH-1015 Lausanne, Switzerland
000188917 700__ $$aChapman, T.$$uLawrence Livermore Natl Lab, Livermore, CA 94551 USA
000188917 700__ $$aDivol, L.$$uLawrence Livermore Natl Lab, Livermore, CA 94551 USA
000188917 700__ $$aStill, C. H.$$uLawrence Livermore Natl Lab, Livermore, CA 94551 USA
000188917 700__ $$aValeo, E. J.
000188917 773__ $$j20$$k3$$q032107$$tPhysics Of Plasmas
000188917 909C0 $$pCRPP
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000188917 937__ $$aEPFL-ARTICLE-188917
000188917 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
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