Vol. 1, No 2, 1995 pp. 143 - 159
UDC 533.9.01

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WAVE DAMPING INFLUENCE ON STIMULATED RAMAN SCATTERING BEHAVIOUR IN A HOMOGENEOUS PLASMA
M.S. Jovanović¹, M.M. Škorić^2
1Department of Physics, University of Niš, P.O. BOX 91, 18001 Niš, Yugoslavia
²Vinča Institute of Nuclear Sciences, P.O. BOX 522, 11001 Belgrade, Yugoslavia

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Abstract. A problem of (non)stationarity of nonlinearly saturated regime of stimulated Raman backscattering in a homogeneous plasma layer is examined. Slowly varying wave envelope equations with the damping and the nonlinear frequency shift terms included are treated numerically and analytically. It is demonstrated that the variation in the damping rate drives the system through various dynamical regimes (from the steady-state to the chaotic one). Quantitative relations that enable prediction of the type of asymptotic (saturated) behaviour of Raman instability are obtained and discussed.

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UTICAJ AMORTIZACIJE TALASA NA PONAŠANJE STIMULISANOG RAMANOVOG RASEJANJA U HOMOGENOJ PLAZMI U radu se razmatra problem (ne)stacionarnosti nelinearnog zasićenog režima stimulisanog Ramanovog rasejanja unazad u homogenom sloju plazme. Jednačine za sporo promenljive talasne obvojnice, uz uključenu amortizaciju i nelinearni frekventni pomak, rešavane su numerički i analitički. Pokazano je da promena koeficijenta amortizacije vodi sistem kroz različite dinamičke režime, od stacionarnog do haotičnog. Izvedene su i disku- tovane kvantitativne relacije koje omogućuju predviđanje tipa asimptotskog ponašanja Ramanove nestabilnosti u plazmi.