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

0580610 - ÚFP 2024 RIV GB eng J - Journal Article
Gu, Yanjun - Klimo, O. - Nicolaï, P. - Shekhanov, S. - Weber, S. - Tikhonchuk, V.T.
Collective absorption of laser radiation in plasma at sub-relativistic intensities.
High Power Laser Science and Engineering. Roč. 7, July (2019), č. článku e39. ISSN 2095-4719. E-ISSN 2052-3289
R&D Projects: GA MŠMT EF16_013/0001793; GA MŠMT EF15_003/0000449; GA MŠMT EF16_019/0000789; GA MŠMT EF16_019/0000778
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : inertial confinement fusion * parametric instabilities
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.606, year: 2019
Method of publishing: Open access
https://www.cambridge.org/core/journals/high-power-laser-science-and-engineering/article/collective-absorption-of-laser-radiation-in-plasma-at-subrelativistic-intensities/BFB241E19631D11BF5080DC9396228FE

Processes of laser energy absorption and electron heating in an expanding plasma in the range of irradiances 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.
Permanent Link: https://hdl.handle.net/11104/0349379