Stimulated Raman backscattering in the presence of ion‐acoustic fluctuations
Threshold conditions are analyzed for stimulated Raman backscattering (SRS) from an underdense plasma in the presence of ion‐acoustic fluctuations. For typical ion‐acoustic spectra which could result from a Brillouin instability occurring simultaneously with SRS, a reduced collisional threshold due...
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| Veröffentlicht in: | Phys. Fluids; (United States) 1983-04, Vol.26 (4), p.1071-1078 |
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| container_end_page | 1078 |
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| container_issue | 4 |
| container_start_page | 1071 |
| container_title | Phys. Fluids; (United States) |
| container_volume | 26 |
| creator | Rozmus, W. Offenberger, A. A. Fedosejevs, R. |
| description | Threshold conditions are analyzed for stimulated Raman backscattering (SRS) from an underdense plasma in the presence of ion‐acoustic fluctuations. For typical ion‐acoustic spectra which could result from a Brillouin instability occurring simultaneously with SRS, a reduced collisional threshold due to induced bremsstrahlung is found for the Raman instability. Similarly, for inhomogeneous plasma the phase mismatch created by a density gradient can be compensated for by an inhomogeneity in the ion‐acoustic spectrum; as a consequence, the inhomogeneity threshold for absolute instability can be substantially reduced. Comparisons are made with experimental observations of stimulated Raman scattering in the presence of strong stimulated Brillouin scattering for CO2 laser‐plasma interaction. It is found theoretically that for fluctuation levels typical of that accompanying SBS, induced bremsstrahlung growth rates for Langmuir waves can be of the order of collisional damping rates. |
| doi_str_mv | 10.1063/1.864219 |
| format | Article |
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A. ; Fedosejevs, R.</creator><creatorcontrib>Rozmus, W. ; Offenberger, A. A. ; Fedosejevs, R. ; Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G7, Canada</creatorcontrib><description>Threshold conditions are analyzed for stimulated Raman backscattering (SRS) from an underdense plasma in the presence of ion‐acoustic fluctuations. For typical ion‐acoustic spectra which could result from a Brillouin instability occurring simultaneously with SRS, a reduced collisional threshold due to induced bremsstrahlung is found for the Raman instability. Similarly, for inhomogeneous plasma the phase mismatch created by a density gradient can be compensated for by an inhomogeneity in the ion‐acoustic spectrum; as a consequence, the inhomogeneity threshold for absolute instability can be substantially reduced. Comparisons are made with experimental observations of stimulated Raman scattering in the presence of strong stimulated Brillouin scattering for CO2 laser‐plasma interaction. It is found theoretically that for fluctuation levels typical of that accompanying SBS, induced bremsstrahlung growth rates for Langmuir waves can be of the order of collisional damping rates.</description><identifier>ISSN: 0031-9171</identifier><identifier>EISSN: 2163-4998</identifier><identifier>DOI: 10.1063/1.864219</identifier><identifier>CODEN: PFLDAS</identifier><language>eng</language><publisher>United States</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; 700108 - Fusion Energy- Plasma Research- Wave Phenomena ; AMPLITUDES ; BACKSCATTERING ; BASIC INTERACTIONS ; BEAMS ; COHERENT SCATTERING ; DISPERSION RELATIONS ; ELECTROMAGNETIC INTERACTIONS ; ENERGY ; EQUATIONS ; FLUCTUATIONS ; INTERACTIONS ; ION ACOUSTIC WAVES ; ION WAVES ; PLASMA ; PLASMA WAVES ; POLARIZED BEAMS ; RAMAN EFFECT ; SCATTERING ; THRESHOLD ENERGY ; VARIATIONS</subject><ispartof>Phys. 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A.</creatorcontrib><creatorcontrib>Fedosejevs, R.</creatorcontrib><creatorcontrib>Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G7, Canada</creatorcontrib><title>Stimulated Raman backscattering in the presence of ion‐acoustic fluctuations</title><title>Phys. Fluids; (United States)</title><description>Threshold conditions are analyzed for stimulated Raman backscattering (SRS) from an underdense plasma in the presence of ion‐acoustic fluctuations. For typical ion‐acoustic spectra which could result from a Brillouin instability occurring simultaneously with SRS, a reduced collisional threshold due to induced bremsstrahlung is found for the Raman instability. Similarly, for inhomogeneous plasma the phase mismatch created by a density gradient can be compensated for by an inhomogeneity in the ion‐acoustic spectrum; as a consequence, the inhomogeneity threshold for absolute instability can be substantially reduced. Comparisons are made with experimental observations of stimulated Raman scattering in the presence of strong stimulated Brillouin scattering for CO2 laser‐plasma interaction. It is found theoretically that for fluctuation levels typical of that accompanying SBS, induced bremsstrahlung growth rates for Langmuir waves can be of the order of collisional damping rates.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>700108 - Fusion Energy- Plasma Research- Wave Phenomena</subject><subject>AMPLITUDES</subject><subject>BACKSCATTERING</subject><subject>BASIC INTERACTIONS</subject><subject>BEAMS</subject><subject>COHERENT SCATTERING</subject><subject>DISPERSION RELATIONS</subject><subject>ELECTROMAGNETIC INTERACTIONS</subject><subject>ENERGY</subject><subject>EQUATIONS</subject><subject>FLUCTUATIONS</subject><subject>INTERACTIONS</subject><subject>ION ACOUSTIC WAVES</subject><subject>ION WAVES</subject><subject>PLASMA</subject><subject>PLASMA WAVES</subject><subject>POLARIZED BEAMS</subject><subject>RAMAN EFFECT</subject><subject>SCATTERING</subject><subject>THRESHOLD ENERGY</subject><subject>VARIATIONS</subject><issn>0031-9171</issn><issn>2163-4998</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1983</creationdate><recordtype>article</recordtype><recordid>eNp10MtKxDAUBuAgCo6j4CMEF6KLjrlN2ixl8Aai4GUdMqenTrRNxyZduPMRfEafxI516-rA4eNcfkIOOZtxpuUZnxVaCW62yERwLTNlTLFNJoxJnhme812yF-MrY0JxJSfk7jH5pq9dwpI-uMYFunTwFsGlhJ0PL9QHmlZI1x1GDIC0rahvw_fnl4O2j8kDreoeUu_S0I77ZKdydcSDvzolz5cXT4vr7Pb-6mZxfpuBLGTKkAtXFYWU80oxrViZ50YZx9CJUgvUDnMuwLAcDPJlOXeymEsmdMXAVFrkckqOxrntcIKN4BPCCtoQEJLVTGlt1ICOR7Tu2vceY7KNj4B17QIOt1shpVFc6gGejBC6NsYOK7vufOO6D8uZ3aRquR1THejpSDc7f3_-3_4Aggd3EA</recordid><startdate>198304</startdate><enddate>198304</enddate><creator>Rozmus, W.</creator><creator>Offenberger, A. A.</creator><creator>Fedosejevs, R.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>198304</creationdate><title>Stimulated Raman backscattering in the presence of ion‐acoustic fluctuations</title><author>Rozmus, W. ; Offenberger, A. A. ; Fedosejevs, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c383t-e12af88335f40640d77949a0ea2d62e6ae712c907c9e1bd5a3853026f0c9f6273</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1983</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>700108 - Fusion Energy- Plasma Research- Wave Phenomena</topic><topic>AMPLITUDES</topic><topic>BACKSCATTERING</topic><topic>BASIC INTERACTIONS</topic><topic>BEAMS</topic><topic>COHERENT SCATTERING</topic><topic>DISPERSION RELATIONS</topic><topic>ELECTROMAGNETIC INTERACTIONS</topic><topic>ENERGY</topic><topic>EQUATIONS</topic><topic>FLUCTUATIONS</topic><topic>INTERACTIONS</topic><topic>ION ACOUSTIC WAVES</topic><topic>ION WAVES</topic><topic>PLASMA</topic><topic>PLASMA WAVES</topic><topic>POLARIZED BEAMS</topic><topic>RAMAN EFFECT</topic><topic>SCATTERING</topic><topic>THRESHOLD ENERGY</topic><topic>VARIATIONS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rozmus, W.</creatorcontrib><creatorcontrib>Offenberger, A. A.</creatorcontrib><creatorcontrib>Fedosejevs, R.</creatorcontrib><creatorcontrib>Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G7, Canada</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Phys. Fluids; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rozmus, W.</au><au>Offenberger, A. A.</au><au>Fedosejevs, R.</au><aucorp>Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G7, Canada</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stimulated Raman backscattering in the presence of ion‐acoustic fluctuations</atitle><jtitle>Phys. Fluids; (United States)</jtitle><date>1983-04</date><risdate>1983</risdate><volume>26</volume><issue>4</issue><spage>1071</spage><epage>1078</epage><pages>1071-1078</pages><issn>0031-9171</issn><eissn>2163-4998</eissn><coden>PFLDAS</coden><abstract>Threshold conditions are analyzed for stimulated Raman backscattering (SRS) from an underdense plasma in the presence of ion‐acoustic fluctuations. For typical ion‐acoustic spectra which could result from a Brillouin instability occurring simultaneously with SRS, a reduced collisional threshold due to induced bremsstrahlung is found for the Raman instability. Similarly, for inhomogeneous plasma the phase mismatch created by a density gradient can be compensated for by an inhomogeneity in the ion‐acoustic spectrum; as a consequence, the inhomogeneity threshold for absolute instability can be substantially reduced. Comparisons are made with experimental observations of stimulated Raman scattering in the presence of strong stimulated Brillouin scattering for CO2 laser‐plasma interaction. It is found theoretically that for fluctuation levels typical of that accompanying SBS, induced bremsstrahlung growth rates for Langmuir waves can be of the order of collisional damping rates.</abstract><cop>United States</cop><doi>10.1063/1.864219</doi><tpages>8</tpages></addata></record> |
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| identifier | ISSN: 0031-9171 |
| ispartof | Phys. Fluids; (United States), 1983-04, Vol.26 (4), p.1071-1078 |
| issn | 0031-9171 2163-4998 |
| language | eng |
| recordid | cdi_crossref_primary_10_1063_1_864219 |
| source | Alma/SFX Local Collection |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY 700108 - Fusion Energy- Plasma Research- Wave Phenomena AMPLITUDES BACKSCATTERING BASIC INTERACTIONS BEAMS COHERENT SCATTERING DISPERSION RELATIONS ELECTROMAGNETIC INTERACTIONS ENERGY EQUATIONS FLUCTUATIONS INTERACTIONS ION ACOUSTIC WAVES ION WAVES PLASMA PLASMA WAVES POLARIZED BEAMS RAMAN EFFECT SCATTERING THRESHOLD ENERGY VARIATIONS |
| title | Stimulated Raman backscattering in the presence of ion‐acoustic fluctuations |
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