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Xiao CZ, Chen YG, Myatt JF, Wang Q, Chen Y, Liu ZJ, Zheng CY, He XT. Absolute stimulated Brillouin side scattering in an inhomogeneous flowing plasma. Phys Rev E 2021; 104:065203. [PMID: 35030935 DOI: 10.1103/physreve.104.065203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 12/01/2021] [Indexed: 06/14/2023]
Abstract
Theory of absolute stimulated Brillouin side scattering in an inhomogeneous flowing plasma is presented and verified numerically. The linearized coupling equations are transformed into a Schrödinger equation in k space and solved as an eigenvalue problem. Analytic threshold, growth rate, and scattering geometry are obtained for the pump laser with arbitrary incidence angle. Numerical solutions of the coupling equations show good agreements between the theoretical and numerical absolute thresholds when ion-acoustic wave damping is not too large, and thus an old but famous threshold in [Phys. Fluids 17, 1211 (1974)PFLDAS0031-917110.1063/1.1694867] is corrected. It also indicates that the theoretical analysis is not accurate for strong dampings, since it will overestimate the absolute threshold. Possibility of finding such instability in the current experiments is also discussed.
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Affiliation(s)
- C Z Xiao
- School of Physics and Electronics, Hunan University, Changsha 410082, China
- Department of Electrical and Computer Engineering, 9211 116 St. NW, University of Alberta, Alberta T6G 1H9, Canada
- Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
| | - Y G Chen
- School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - J F Myatt
- Department of Electrical and Computer Engineering, 9211 116 St. NW, University of Alberta, Alberta T6G 1H9, Canada
| | - Q Wang
- Department of Electrical and Computer Engineering, 9211 116 St. NW, University of Alberta, Alberta T6G 1H9, Canada
| | - Y Chen
- School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Z J Liu
- Institute of Applied Physics and Computational Mathematics, Beijing 100084, China
- HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China
| | - C Y Zheng
- Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
- Institute of Applied Physics and Computational Mathematics, Beijing 100084, China
- HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China
| | - X T He
- Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
- Institute of Applied Physics and Computational Mathematics, Beijing 100084, China
- HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China
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Goyon C, Depierreux S, Yahia V, Loisel G, Baccou C, Courvoisier C, Borisenko NG, Orekhov A, Rosmej O, Labaune C. Experimental approach to interaction physics challenges of the shock ignition scheme using short pulse lasers. PHYSICAL REVIEW LETTERS 2013; 111:235006. [PMID: 24476284 DOI: 10.1103/physrevlett.111.235006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 07/17/2013] [Indexed: 06/03/2023]
Abstract
An experimental program was designed to study the most important issues of laser-plasma interaction physics in the context of the shock ignition scheme. In the new experiments presented in this Letter, a combination of kilojoule and short laser pulses was used to study the laser-plasma coupling at high laser intensities for a large range of electron densities and plasma profiles. We find that the backscatter is dominated by stimulated Brillouin scattering with stimulated Raman scattering staying at a limited level. This is in agreement with past experiments using long pulses but laser intensities limited to 2×10(15) W/cm2, or short pulses with intensities up to 5×10(16) W/cm2 as well as with 2D particle-in-cell simulations.
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Affiliation(s)
- C Goyon
- CEA, DAM, DIF, F-91297 Arpajon, France
| | | | - V Yahia
- LULI, Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France
| | - G Loisel
- LULI, Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France
| | - C Baccou
- LULI, Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France
| | | | - N G Borisenko
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
| | - A Orekhov
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
| | - O Rosmej
- GSI Helmhotzzentrum fur Schwerionenforschung, 64291 Darmstadt, Germany
| | - C Labaune
- LULI, Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France
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Loiseau P, Morice O, Teychenné D, Casanova M, Hüller S, Pesme D. Laser-beam smoothing induced by stimulated brillouin scattering in an inhomogeneous plasma. PHYSICAL REVIEW LETTERS 2006; 97:205001. [PMID: 17155686 DOI: 10.1103/physrevlett.97.205001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2006] [Indexed: 05/12/2023]
Abstract
We present results of two-dimensional simulations of the stimulated Brillouin scattering (SBS) of an optically smoothed laser beam propagating in an expanding plasma. In the weak damping limit, both backscattered and transmitted light waves exhibit an additional spatiotemporal incoherence, which is shown to be induced by SBS taking place in an inhomogeneous plasma. This mechanism is not related to laser-beam self-focusing and is thus complementary to plasma-induced smoothing [A. J. Schmitt and B. B. Afeyan, Phys. Plasmas 5, 503 (1998)]. The incoherence induced by SBS in the entrance part of the plasma could reduce the growth of parametric instabilities developing further inside the plasma and is able to significantly enlarge the spreading angle of the transmitted light. The angular width of the backscattered light is also found to be significantly larger than the aperture angle of the incident beam.
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Affiliation(s)
- P Loiseau
- Commissariat à l'Energie Atomique, BP 12, 91680 Bruyères-Le-Châtel, France
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Bandulet HC, Labaune C, Lewis K, Depierreux S. Thomson-scattering study of the subharmonic decay of ion-acoustic waves driven by the Brillouin instability. PHYSICAL REVIEW LETTERS 2004; 93:035002. [PMID: 15323828 DOI: 10.1103/physrevlett.93.035002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2003] [Indexed: 05/24/2023]
Abstract
Thomson scattering (TS) has been used to investigate the two-ion decay instability of ion acoustic waves generated by stimulated Brillouin scattering in an underdense CH plasma. Two complementary TS diagnostics, spectrally and spatially resolved, demonstrate the occurrence of the subharmonic decay of the primary ion acoustic wave into two secondary waves. The study of the laser intensity dependence shows that the secondary ion acoustic waves are correlated with the SBS reflectivity saturation, at a level of a few percent.
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Affiliation(s)
- H C Bandulet
- Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605 CNRS-Ecole Polytechnique-CEA-Université Paris Virgin Islands, Ecole Polytechnique 91128 Palaiseau Cedex, France
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Fuchs J, Labaune C, Bandulet H, Michel P, Depierreux S, Baldis HA. Reduction of the coherence time of an intense laser pulse propagating through a plasma. PHYSICAL REVIEW LETTERS 2002; 88:195003. [PMID: 12005640 DOI: 10.1103/physrevlett.88.195003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2001] [Indexed: 05/23/2023]
Abstract
We present direct measurements of the coherence time of a laser beam after propagation through an underdense plasma. At an intensity of 10(14) W/cm(2), a large decrease of the coherence time is observed, from 300 ps to a few picoseconds. This decrease is larger as the plasma density is increased or as the light is scattered at larger angles. The amount of temporal decorrelation as well as the effect of the plasma density, laser intensity, and scattering angle all coincide with trends observed in recent numerical simulations.
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Affiliation(s)
- J Fuchs
- Laboratoire pour l'Utilisation des Lasers Intenses, UMR No. 7605 CNRS-Ecole Polytechnique-CEA-Université Paris VI, Ecole Polytechnique 91128 Palaiseau Cedex, France
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