Effective suppression of parametric instabilities with decoupled broadband lasers in plasma

Zhao, Yao and Weng, Suming and Chen, Min and Zheng, Jun and Zhuo, Hongbin and Ren, Chuang and Sheng, Zhengming and Zhang, Jie (2017) Effective suppression of parametric instabilities with decoupled broadband lasers in plasma. Physics of Plasmas. 112102. ISSN 1070-664X (https://doi.org/10.1063/1.5003420)

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Abstract

A theoretical analysis for the stimulated Raman scattering (SRS) instability driven by two laser beams with certain frequency difference is presented. It is found that strong coupling and enhanced SRS take place only when the unstable regions for each beam are overlapped in the wavenumber space. Hence 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 under the laser intensity ∼ 1015 W/cm2. Moreover, stimulated Brillouin scattering (SBS) will be suppressed simultaneously with DBLs can be attractive for driving inertial confined fusion.

ORCID iDs

Zhao, Yao, Weng, Suming, Chen, Min, Zheng, Jun, Zhuo, Hongbin, Ren, Chuang, Sheng, Zhengming ORCID logoORCID: https://orcid.org/0000-0002-8823-9993 and Zhang, Jie;
  • Item type:Article
    ID code:62621
    Dates:
    Date
    Event
    2 November 2017
    Published
    16 October 2017
    Accepted
    5 September 2017
    Submitted
    Notes:This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Zhao, Y, Weng, S, Chen, M, Zheng, J, Zhuo, H, Ren, C, Sheng, Z & Zhang, J 2017, 'Effective suppression of parametric instabilities with decoupled broadband lasers in plasma' Physics of Plasmas and may be found at https://doi.org/10.1063/1.5003420abstract).
    Subjects:Science > Physics > Plasma physics. Ionized gases
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:15 Dec 2017 12:26
    Last modified:11 Nov 2024 11:47
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/62621
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