Stimulated Raman scattering in a non-eigenmode regime

Zhao, Yao; Weng, Shangkun; Sheng, Zheng-Ming; Zhu, Jianqiang

doi:10.1017/hpl.2020.22

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…Different from the convective instability, the degenerate modes, including absolute SRS and TPD, always develop in a local density range [( 48,51], where the multiple beamlets share the common daughter waves. Therefore, the beamlets are decoupled from each other when their frequency differences satisfy δω 0 /ω 0 0.866a i .…”

Section: Theoretical Model For Lpi Inhibition Via Polychromatic Lightmentioning

confidence: 99%

Polychromatic drivers for inertial fusion energy

et al. 2022

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Although tremendous achievements have been made toward inertial confinement fusion, laser plasma instabilities (LPIs) remain to be an inevitable problem for current drive schemes. To mitigate these instabilities, significant efforts have been paid to produce high-power broadband ultraviolet lasers. However, no practical scheme has been demonstrated up to now for efficient triple-frequency conversion of broadband laser. Here we propose the design of polychromatic drivers for the generation of multicolor beams mainly based upon the optical parametric amplification, which can significantly enhance the third-harmonic conversion efficiency. Each polychromatic light has four colors of monochromatic beamlets with a full spectrum width of 3\%, and the beamlet colors of any two adjacent flanges are different. The suppression effects of such polychromatic lights have been investigated via large scale particle-in-cell simulations, which indicate that more than 35\% of the incident energy can be saved from the LPIs compared with monochromatic lasers for the direct-drive scheme, or high-density filled target for the indirect-drive scheme. The proposed polychromatic drivers are based on the matured technologies, and thus may pave the way towards realization of robust and high-efficiency fusion ignition.

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Section: Theoretical Model For Lpi Inhibition Via Polychromatic Lightmentioning

confidence: 99%

Polychromatic drivers for inertial fusion energy

et al. 2022

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“…for beam 1 can be obtained from equation (8) under v th = 0, a 2 = 0 and ⃗ k = ⃗ k 1 [52]. The pump beams will no longer share with a common scattering light when…”

Section: Srs Driven By Multibeam In Inhomogeneous Plasmasmentioning

confidence: 99%

Mitigation of multibeam stimulated Raman scattering with polychromatic light

Zhao

Weng

et al. 2021

Plasma Phys. Control. Fusion

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A theoretical analysis is presented for the stimulated Raman scattering (SRS) driven by multiple beams with certain frequency differences or bandwidths. The concomitant electrostatic modes are excited by the scattering lights when the pump beams share a common electron plasma wave to drive SRS. This coupling can be suppressed when the frequency difference of the two beams is three times larger than the SRS growth rate of a single beam, where the beams develop their scattering lights independently. To mitigate SRS further under the multibeam irradiation, polychromatic pumps are introduced to reduce the SRS saturation level, where the weakly coupled common modes are heavily damped in hot plasmas. The sidescattering driven by polychromatic light in inhomogeneous plasmas is significantly reduced due to the wavevector mismatch of daughter waves. Particle-in-cell simulations confirm our theoretical analysis and demonstrate that the strength of multibeam SRS and the hot electron production in inhomogeneous plasmas can be controlled at a low level by polychromatic light with a few percentage bandwidth ( ≳ 3 % ), even in the non-linear regime.

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“…Different from the convective SRS, the absolute SRS always develops in the density range 38,42], where the multiple beams share the same scattering light. Analogously, the dispersion relation also indicates that TPD occurs in the same density region as absolute SRS.…”

Section: Theoretical Model For Lpi Inhibition Via Polychromatic Lightmentioning

confidence: 99%

Polychromatic drivers for inertial fusion energy

Zhao,

Sheng,

Cui

et al. 2021

Preprint

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Although tremendous achievements have been made toward inertial confinement fusion, laser plasma instabilities (LPIs) remain to be the inevitable problem for current drive schemes. To mitigate these instabilities, here we propose the design of polychromatic drivers for the generation of multicolor beams based upon optical parametric amplification and frequency conversion technologies. Each polychromatic light has four colors of monochromatic beamlets with a full spectrum width of 3%, and the beamlet colors of any two adjacent flanges are different. The suppression effects of such polychromatic lights have been investigated via particle-incell simulations, which indicate that more than 35% of the incident energies can be saved from the LPIs compared with monochromatic lasers for the direct drive scheme, or high-density filled target for the indirect drive scheme. The proposed polychromatic drivers are based on the matured technologies, and thus may pave the way towards realization of stable and high-efficiency fusion ignition.

show abstract

Stimulated Raman scattering in a non-eigenmode regime

Cited by 7 publications

References 35 publications

Polychromatic drivers for inertial fusion energy

Polychromatic drivers for inertial fusion energy

Mitigation of multibeam stimulated Raman scattering with polychromatic light

Polychromatic drivers for inertial fusion energy

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