Journal Article

FZJ-2021-05098

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mitigating parametric instabilities in plasmas by sunlight-like lasers

Ma, H. H. ; Li, X. F. (Corresponding author)FZJ* ; Weng, S. M. (Corresponding author)Extern* ; Yew, S. H.Extern* ; Kawata, S.Extern* ; Gibbon, P.FZJ* ; Sheng, Z. M. (Corresponding author)Extern* ; Zhang, J.Extern*

2021
AIP Publishing Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/29427  doi:10.1063/5.0054653

Abstract: Sunlight-like lasers that have a continuous broad frequency spectrum, random phase spectrum, and random polarization are formulated theoretically. With a sunlight-like laser beam consisting of a sequence of temporal speckles, the resonant three-wave coupling that underlies parametric instabilities in laser–plasma interactions can be greatly degraded owing to the limited duration of each speckle and the frequency shift between two adjacent speckles. The wave coupling can be further weakened by the random polarization of such beams. Numerical simulations demonstrate that the intensity threshold of stimulated Raman scattering in homogeneous plasmas can be doubled by using a sunlight-like laser beam with a relative bandwidth of ∼1% as compared with a monochromatic laser beam. Consequently, the hot-electron generation harmful to inertial confinement fusion can be effectively controlled by using sunlight-like laser drivers. Such drivers may be realized in the next generation of broadband lasers by combining two or more broadband beams with independent phase spectra or by applying polarization smoothing to a single broadband beam.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)
2. Kinetic Plasma Simulation with Highly Scalable Particle Codes (jzam04_20190501) (jzam04_20190501)
3. EUROfusion - Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium (633053) (633053)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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