Modeling of stimulated Brillouin scattering near the critical-density surface in the plasmas of direct-drive inertial confinement fusion targets

Inertial confinement fusion (ICF) has made great progress. In fact several significant scientific firsts have been achieved in the last year. These developments have presented the ICF community with an opportunity to embark on a new phase in ICF research. The key issues of laser fusion are to attain a high absorption of laser light in a plasma, to prevent preheating of fuel during the compression, and to achieve highly efficient implosion by uniform compression of fuel due to the homogeneous deposition of laser energy on the pellet surface. Direct drive and indirect drive have been investigated. The progress in both schemes is remarkable. The neutron yield by the stagnation free compression of the LHART target has attained 1013 which corresponds to a pellet gain of 1/500. The plastic shell target has reached a fuel density as large as 600 times the liquid density which is measured by the Si activation method as well as the D knockon method. A cryogenic foam target is now under investigation.

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A suite of neutron time-of-flight detectors to measure hot-spot motion in direct-drive inertial confinement fusion experiments on OMEGA

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2020.163774 ◽

2020 ◽

Vol 964 ◽

pp. 163774 ◽

Cited By ~ 2

Author(s):

O.M. Mannion ◽

J.P. Knauer ◽

V.Yu. Glebov ◽

C.J. Forrest ◽

A. Liu ◽

...

Keyword(s):

Inertial Confinement Fusion ◽

Hot Spot ◽

Time Of Flight ◽

Inertial Confinement ◽

Direct Drive ◽

Confinement Fusion ◽

Neutron Time ◽

Spot Motion ◽

Fusion Experiments

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

High Power Laser Science and Engineering ◽

10.1017/hpl.2019.25 ◽

2019 ◽

Vol 7 ◽

Cited By ~ 3

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.

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Saturation of the Two-Plasmon Decay Instability in Long-Scale-Length Plasmas Relevant to Direct-Drive Inertial Confinement Fusion

Physical Review Letters ◽

10.1103/physrevlett.108.165003 ◽

2012 ◽

Vol 108 (16) ◽

Cited By ~ 41

Author(s):

D. H. Froula ◽

B. Yaakobi ◽

S. X. Hu ◽

P-Y. Chang ◽

R. S. Craxton ◽

...

Keyword(s):

Inertial Confinement Fusion ◽

Inertial Confinement ◽

Direct Drive ◽

Decay Instability ◽

Confinement Fusion ◽

Scale Length

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Thermodynamic properties of thermonuclear fuel in inertial confinement fusion

Laser and Particle Beams ◽

10.1017/s0263034616000422 ◽

2016 ◽

Vol 34 (3) ◽

pp. 539-544 ◽

Cited By ~ 2

Author(s):

V. Brandon ◽

B. Canaud ◽

M. Temporal ◽

R. Ramis

Keyword(s):

Kinetic Energy ◽

Inertial Confinement Fusion ◽

Hot Spot ◽

Inertial Confinement ◽

Direct Drive ◽

Aspect Ratios ◽

Confinement Fusion ◽

Thermonuclear Fuel ◽

Target Family ◽

Very High

AbstractHot-spot path in the thermodynamic space $({\rm \rho} R,T_{\rm i} )_{{\rm hs}} $ is investigated for direct-drive scaled-target family covering a huge interval of kinetic energy on both sides of kinetic threshold for ignition. Different peak implosion velocities and two initial aspect ratios have been considered. It is shown that hot spot follows almost the same path during deceleration up to stagnation whatever the target is. As attended, after stagnation, a clear distinction is done between non-, marginally-, or fully igniting targets. For the last, ionic temperature can reach very high values when the thermonuclear energy becomes very high.

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