Effective suppression of parametric instabilities with decoupled broadband lasers in plasma

Zhao, Yao; Weng, Suming; Chen, Min; Zheng, Jun; Zhuo, Hongbin; Ren, Chuang; Sheng, Zhengming; Zhang, Jie

doi:10.1063/1.5003420

Title: Effective suppression of parametric instabilities with decoupled broadband lasers in plasma

Journal Article · Thu Nov 02 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5003420· OSTI ID:1543845

Zhao, Yao ^[1]; Weng, Suming ^[1];

^[1]; Zheng, Jun ^[1]; Zhuo, Hongbin ^[2]; Ren, Chuang ^[3]; Sheng, Zhengming ^[4]; Zhang, Jie ^[1]

Shanghai Jiao Tong Univ., Shanghai (China)
Shanghai Jiao Tong Univ., Shanghai (China); National Univ. of Defense Technology, Changsha (China)
Univ. of Rochester, NY (United States)
Shanghai Jiao Tong Univ., Shanghai (China); Univ.of Strathclyde, Glasgow (Scotland)

A theoretical assessment for the stimulated Raman scattering (SRS) instability driven by two laser beams with a certain frequency difference is introduced. It is found that strong coupling and enhanced SRS take place only when the unstable regions corresponding to the two beams are overlapped in the wavenumber space. Thus, a threshold of the beam frequency difference for their decoupling is found as a function of their intensity and plasma density. Based upon this, a strategy to suppress the SRS instability with decoupled broadband lasers (DBLs) is proposed. A DBL can be composed of tens or even hundreds of beamlets, where the beamlets are distributed uniformly in a broad spectrum range such as over 10% of the central frequency. Decoupling among the beamlets is found due to the limited beamlet energy and suitable frequency difference between neighboring beamlets. Particle-in-cell simulations demonstrate that SRS can be almost completely suppressed with DBLs at the laser intensity of ~10¹⁵ W/cm². Moreover, stimulated Brillouin scattering (SBS) will be suppressed simultaneously with DBLs as long as SRS is suppressed. DBLs can be attractive for driving inertial confined fusion.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE; National Science Foundation of China

OSTI ID:: 1543845

Journal Information:: Physics of Plasmas, Vol. 24, Issue 11; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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