Mitigating parametric instabilities in plasmas by sunlight-like lasers

Ma H. H.; Li X. F.; Weng S. M.; Yew S. H.; Kawata S.; Gibbon P.; Sheng Z. M.; Zhang J.

doi:10.1063/5.0054653

Volume 6 Issue 5

Sep. 2021

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Ma H. H., Li X. F., Weng S. M., Yew S. H., Kawata S., Gibbon P., Sheng Z. M., Zhang J.. Mitigating parametric instabilities in plasmas by sunlight-like lasers[J]. Matter and Radiation at Extremes, 2021, 6(5): 055902. doi: 10.1063/5.0054653

Citation:

Ma H. H., Li X. F., Weng S. M., Yew S. H., Kawata S., Gibbon P., Sheng Z. M., Zhang J.. Mitigating parametric instabilities in plasmas by sunlight-like lasers[J]. Matter and Radiation at Extremes, 2021, 6(5): 055902. doi: 10.1063/5.0054653

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Mitigating parametric instabilities in plasmas by sunlight-like lasers

doi: 10.1063/5.0054653

Ma H. H.^{1, 2, 3
,},
Li X. F.^{1, 2, 4
,
,
,},
Weng S. M.^{1, 2
,
,
,},
Yew S. H.^{1, 2
,},
Kawata S.^3
,,
Gibbon P.^{4, 5
,},
Sheng Z. M.^{1, 2, 6, 7
,
,
,},
Zhang J.^{1, 2}

1.
Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2.
Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
3.
Graduate School of Engineering, Utsunomiya University, Yohtoh 7-1-2, Utsunomiya 321-8585, Japan
4.
Institute for Advanced Simulation, Jülich Supercomputing Centre, Forschungszentrum Jülich, 52425 Jülich, Germany
5.
Centre for Mathematical Plasma Astrophysics, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
6.
SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom
7.
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China

More Information

Corresponding author: a)Authors to whom correspondence should be addressed: xiaofengli@sjtu.edu.cn; wengsuming@sjtu.edu.cn; and z.sheng@strath.ac.uk; a)Authors to whom correspondence should be addressed: xiaofengli@sjtu.edu.cn; wengsuming@sjtu.edu.cn; and z.sheng@strath.ac.uk; a)Authors to whom correspondence should be addressed: xiaofengli@sjtu.edu.cn; wengsuming@sjtu.edu.cn; and z.sheng@strath.ac.uk
Received Date: 2021-04-20
Accepted Date: 2021-08-13

Available Online: 2021-09-01

Publish Date: 2021-09-15

Abstract

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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References(49)

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