A High-Order Perturbation Method for an Investigation into Relativistic Stimulated Raman Back Scattering of a High Power Laser in Plasma
| Autor: | B. Maraghechi, P. Sharbati, M. Olumi |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Nuclear and High Energy Physics Waves in plasmas Scattering Plasma Laser 01 natural sciences Electromagnetic radiation 010305 fluids & plasmas law.invention Computational physics Nonlinear system symbols.namesake Nuclear Energy and Engineering law 0103 physical sciences symbols 010306 general physics Raman spectroscopy Raman scattering |
| Zdroj: | Journal of Fusion Energy. 39:8-15 |
| ISSN: | 1572-9591 0164-0313 |
| DOI: | 10.1007/s10894-019-00228-2 |
| Popis: | The relativistic stimulated Raman back scattering (SRBS) of a high power linearly polarized laser pulse in the plasma is investigated. The nonlinear coupled equations of Raman instabilities in the presence of combined effects of relativistic and ponderomotive nonlinearities are derived. Using high-order perturbation method in relativistic fluid-Maxwell model, a set of coupled non-linear equations is obtained which describes the evolutions of two scattered electromagnetic waves and a modified plasma wave. The temporal evolution of SRBS process is then studied using numerical solutions of the set of coupled equations. The results showed that by using the linear approximation, the relativistic mass correction cannot be employed accurately and it leads to over-estimation of the perturbed current density and Raman Scattering. Our analysis shows that, in the relativistic regime, it is crucial to employ higher order perturbation method to obtain reliable results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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