Stimulated Raman scattering in the presence of trapped particle instability |
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| Institution: | 1. Dipartimento di Fisica, Universita’ di Pisam, Largo Pontecorvo 3, 56127 Pisa - Italy;2. Institut de Physique et Chimie des Matériaux de Strasbourg, 23, rue du Loess - BP 43 F-67034 Strasbourg, France;1. School of Optoelectronic Information, Chongqing University of Technology, Chongqing 400054, China;2. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China;1. School of Automation and Information Engineering, Xi’an University of Technology, Xi’an, China;2. Department of Applied Physics, Xi’an University of Technology, Xi’an, China;1. Ecole Nationale d’Ingénieurs de Saint-Etienne, 58 rue Jean Parot,42023 Saint-Etienne, France;2. Moscow State University of Technology “STANKIN”, Vadkovsky pereulok 3a, 127055 Moscow, Russia;1. Department of Veterinary Sciences, School of Agrarian and Veterinary Sciences, University of Trás-os-Montes and Alto Douro (UTAD), Vila Real, Portugal;2. Department of Therapeutic and Diagnostic Technologies, Polytechnic Institute of Bragança (IPB), Bragança, Portugal;3. Agrarian School of Viseu, Polytechnic Institute of Viseu, Viseu, Portugal;4. Center for the Study of Education, Technologies and Health, Polytechnic Institute of Viseu, Viseu, Portugal;5. Center for the Research and Technology of Agro-Environmental and Biological Science (CITAB), UTAD, Vila Real, Portugal;6. Center for Mathematics, UTAD, Vila Real, Portugal;7. Animal and Veterinary Research Center (CECAV), UTAD, Vila Real, Portugal |
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| Abstract: | The behaviour of electron gas in a laser plasma corona is studied in the presence of stimulated Raman scattering (SRS). The 1D Vlasov–Maxwell model describing plasma relevant to the experiment PALS (Prague Asterix Laser System), where the nanosecond iodine laser with the wavelength of first harmonic λvac = 1.3152 and with the power density in the focal spot I = 1020 W/m2 is in operation. For the solution of Vlasov equation for the electron distribution function a Fourier–Hermite transform method is used. For the numerical stabilization a small collision term is added to the Vlasov equation keeping its value realistic for the condition relevant to the PALS experiment. The dominant wave modes in our model are both the backward (SRS-B) and the forward (SRS-F) Raman scattering, each of them accompanied by the forward going electron plasma wave. Several mechanisms were identified such as the SRS-B plasma wave spectral broadening due to a trapped particle instability (TPI) or the formation of an electrostatic quasi-mode by non-resonant interaction of SRS-B and SRS-F plasma waves. |
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