Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F19%3A00582251" target="_blank" >RIV/61389021:_____/19:00582251 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/19:00508312 RIV/68407700:21340/19:00339380

Result on the web

<a href="https://www.cambridge.org/core/journals/high-power-laser-science-and-engineering/article/time-evolution-of-stimulated-raman-scattering-and-twoplasmon-decay-at-laser-intensities-relevant-for-shock-ignition-in-a-hot-plasma/2CDE20F724E6354F16AF759E7A808DA7" target="_blank" >https://www.cambridge.org/core/journals/high-power-laser-science-and-engineering/article/time-evolution-of-stimulated-raman-scattering-and-twoplasmon-decay-at-laser-intensities-relevant-for-shock-ignition-in-a-hot-plasma/2CDE20F724E6354F16AF759E7A808DA7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/hpl.2019.37" target="_blank" >10.1017/hpl.2019.37</a>

Result language

angličtina

Original language name

Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Original language description

Laser-plasma interaction (LPI) at intensities is dominated by parametric instabilities which can be responsible for a significant amount of non-collisional absorption and generate large fluxes of high-energy nonthermal electrons. Such a regime is of paramount importance for inertial confinement fusion (ICF) and in particular for the shock ignition scheme. In this paper we report on an experiment carried out at the Prague Asterix Laser System (PALS) facility to investigate the extent and time history of stimulated Raman scattering (SRS) and two-plasmon decay (TPD) instabilities, driven by the interaction of an infrared laser pulse at an intensity with a scalelength plasma produced from irradiation of a flat plastic target. The laser pulse duration (300 ps) and the high value of plasma temperature () expected from hydrodynamic simulations make these results interesting for a deeper understanding of LPI in shock ignition conditions. Experimental results show that absolute TPD/SRS, driven at a quarter of the critical density, and convective SRS, driven at lower plasma densities, are well separated in time, with absolute instabilities driven at early times of interaction and convective backward SRS emerging at the laser peak and persisting all over the tail of the pulse. Side-scattering SRS, driven at low plasma densities, is also clearly observed. Experimental results are compared to fully kinetic large-scale, two-dimensional simulations. Particle-in-cell results, beyond reproducing the framework delineated by the experimental measurements, reveal the importance of filamentation instability in ruling the onset of SRS and stimulated Brillouin scattering instabilities and confirm the crucial role of collisionless absorption in the LPI energy balance.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

High Power Laser Science and Engineering

ISSN

2095-4719

e-ISSN

2052-3289

Volume of the periodical

7

Issue of the periodical within the volume

August

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

e51

UT code for WoS article

000482954900001

EID of the result in the Scopus database

2-s2.0-85071016284