Reducing reflectivity of stimulated Raman scattering by discretely changing phase of incident light in inertial fusion plasmas

2021 ◽  
Author(s):  
Tian Yang ◽  
Shutong Zhang ◽  
yuanzhi Zhou ◽  
Deji Liu ◽  
Xueming Li ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Brillouin Scattering ◽  
Incident Light ◽  
Inertial Confinement ◽  
Fusion Plasmas ◽  
Confinement Fusion ◽  
Coupling Equations ◽  
Stimulated Raman

Abstract A new method to reduce the stimulated Raman scattering (SRS) in inertial confinement fusion conditions is proposed by changing the incident light phase discretely. The proposal is first examined by three-wave coupling equations and then verified by Vlasov simulations. A remarkable decreasing in SRS reflectivity is observed when the period of phase changing is less than 2π/γ, where γ is the growth rate of SRS. By contrast, some simulations with continuously changing phase of incident light are carried out to compare their influence on SRS. In addition, the proposal may suppress the stimulated Brillouin scattering.

Controlling stimulated Raman scattering by two-color light in inertial confinement fusion

2017 ◽  
Vol 24 (8) ◽  
pp. 082704 ◽  
Author(s):  
Z. J. Liu ◽  
Y. H. Chen ◽  
C. Y. Zheng ◽  
L. H. Cao ◽  
B. Li ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Stimulated Raman

scholarly journals Multibeam Stimulated Raman Scattering in Inertial Confinement Fusion Conditions

2015 ◽  
Vol 115 (5) ◽  
Author(s):  
P. Michel ◽  
L. Divol ◽  
E. L. Dewald ◽  
J. L. Milovich ◽  
M. Hohenberger ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Stimulated Raman

scholarly journals Using polarization control plate to suppress transverse stimulated Raman scattering in large-aperture KDP crystal

2018 ◽  
Vol 36 (4) ◽  
pp. 454-457 ◽  
Author(s):  
Xinmin Fan ◽  
Sensen Li ◽  
Xiaodong Huang ◽  
Jianxin Zhang ◽  
Chunyan Wang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Dihydrogen Phosphate ◽  
Inertial Confinement ◽  
Kdp Crystal ◽  
Polarization Control ◽  
Large Aperture ◽  
Control Plate ◽  
Stimulated Raman

AbstractTransverse stimulated Raman scattering (TSRS) is strongly generated in the third-harmonic-generation crystal potassium dihydrogen phosphate (KDP) and can even damage the KDP crystal in inertial confinement fusion drivers. In this work, a method to suppress TSRS is proposed in which the polarization control plate (PCP) is moved to a new position in the existing optical path. The proposed method can suppress TSRS significantly and doubles the laser threshold intensity in KDP crystal when the order of the PCP is 16. This result is attributed to the reduction of the gain length for the Stokes radiation. The proposed method may also be used to suppress other nonlinear effects, including transverse stimulated Brillouin scattering in large-aperture optical components.

Stimulated Brillouin scattering enhanced by stimulated Raman process near the quarter-critical density

2021 ◽  
Author(s):  
Zhanjun Liu ◽  
Qiang Wang ◽  
Bin Li ◽  
Jiwei Li ◽  
Li-hua Cao ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Brillouin Scattering ◽  
Second Harmonic ◽  
Scattered Light ◽  
Incident Light ◽  
Critical Density ◽  
Stimulated Brillouin Scattering ◽  
Stimulated Brillouin ◽  
Stimulated Raman

Abstract Stimulated Raman scattering can occur near the quarter critical density in direct-drive fusions, and the frequency of Raman scattered light is about half of the incident light frequency. The second harmonic of the Raman scattered light can be produced due to the inhomogeneity density profile. It can serve as the seed of stimulated Brillouin scattering (SBS). When the second harmonic of stimulated Raman scattering light propagates against the incident light, some components will match to the frequency of backward SBS and SBS is induced. Thus SBS could be enhanced greatly.

scholarly journals Dynamical properties of inertial confinement fusion plasmas

2018 ◽  
Vol 58 (10) ◽  
pp. 946-951 ◽  
Author(s):  
S.K. Kodanova ◽  
T.S. Ramazanov ◽  
A.K. Khikmetov ◽  
M.K. Issanova
Keyword(s):  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Fusion Plasmas ◽  
Confinement Fusion ◽  
Dynamical Properties

scholarly journals Collective absorption of laser radiation in plasma at sub-relativistic intensities

2019 ◽  
Vol 7 ◽  
Author(s):  
Y. J. Gu ◽  
O. Klimo ◽  
Ph. Nicolaï ◽  
S. Shekhanov ◽  
S. Weber ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Laser Energy ◽  
Brillouin Scattering ◽  
Critical Density ◽  
Plasma Waves ◽  
High Amplitude ◽  
Inertial Confinement ◽  
Hot Electron ◽  
Plasma Parameters

Processes of laser energy absorption and electron heating in an expanding plasma in the range of irradiances $I\unicode[STIX]{x1D706}^{2}=10^{15}{-}10^{16}~\text{W}\,\cdot \,\unicode[STIX]{x03BC}\text{m}^{2}/\text{cm}^{2}$ are studied with the aid of kinetic simulations. The results show a strong reflection due to stimulated Brillouin scattering and a significant collisionless absorption related to stimulated Raman scattering near and below the quarter critical density. Also presented are parametric decay instability and resonant excitation of plasma waves near the critical density. All these processes result in the excitation of high-amplitude electron plasma waves and electron acceleration. The spectrum of scattered radiation is significantly modified by secondary parametric processes, which provide information on the spatial localization of nonlinear absorption and hot electron characteristics. The considered domain of laser and plasma parameters is relevant for the shock ignition scheme of inertial confinement fusion.

scholarly journals Stimulated Raman scattering in a non-eigenmode regime

2020 ◽  
Vol 8 ◽  
Author(s):  
Yao Zhao ◽  
Suming Weng ◽  
Zhengming Sheng ◽  
Jianqiang Zhu
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Laser Energy ◽  
Scattered Light ◽  
Incident Light ◽  
Loss Mechanism ◽  
Constant Frequency ◽  
Electrostatic Wave ◽  
Particle In Cell ◽  
Stimulated Raman

Stimulated Raman scattering (SRS) in plasma in a non-eigenmode regime is studied theoretically and numerically. Different from normal SRS with the eigen electrostatic mode excited, the non-eigenmode SRS is developed at plasma density $n_{e}>0.25n_{c}$ when the laser amplitude is larger than a certain threshold. To satisfy the phase-matching conditions of frequency and wavenumber, the excited electrostatic mode has a constant frequency around half of the incident light frequency $\unicode[STIX]{x1D714}_{0}/2$ , which is no longer the eigenmode of electron plasma wave $\unicode[STIX]{x1D714}_{pe}$ . Both the scattered light and the electrostatic wave are trapped in plasma with their group velocities being zero. Super-hot electrons are produced by the non-eigen electrostatic wave. Our theoretical model is validated by particle-in-cell simulations. The SRS driven in this non-eigenmode regime is an important laser energy loss mechanism in the laser plasma interactions as long as the laser intensity is higher than $10^{15}~\text{W}/\text{cm}^{2}$ .

K-alpha conversion efficiency measurements for X-ray scattering in inertial confinement fusion plasmas

2007 ◽  
Vol 3 (1-2) ◽  
pp. 156-162 ◽  
Author(s):  
A.L. Kritcher ◽  
P. Neumayer ◽  
M.K. Urry ◽  
H. Robey ◽  
C. Niemann ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Fusion Plasmas ◽  
X Ray ◽  
X Ray Scattering ◽  
Confinement Fusion ◽  
Ray Scattering
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