Development of low-coherence high-power laser drivers for inertial confinement fusion

Gao, Yiqing; Cui, Yong; Ji, Lanzhu; Rao, Daxing; Zhao, Xiaohui; Li, Fujian; Liu, D.; Feng, Wei; Xia, Lixue; Liu, Jiani; Shi, Haitao; Du, Peng; Liu, Jia; Li, Xiaoli; Wang, Tao; Zhang, Tianxiong; Shan, Chengwei; Hua, Yi-Lin; Ma, Wu; Sun, Xun; Chen, Xianfeng; Huang, Xiaoan; Zhu, Jie; Pei, Wenbing; Zhan, Shiping; Fu, Sizu

doi:10.1063/5.0009319

Cited by 46 publications

(11 citation statements)

References 110 publications

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“…As expected, the change of κ U A is negligible when ∆λ 0 varies from zero to 6 nm. The cases with small crossing angle 2 tan(θ 12 /2) ≲ ∆λ 0 /λ 0 should be of interest in the attempt to suppress laser-plasma parametric instabilities with broadband lasers [32][33][34]. In most other situations of ICF, the crossing angle θ 12 is typically not too small, but the laser wavelength difference is much shorter than the vacuum wavelength [35], making its effects on the SP modes negligible.…”

Section: Analysis Of Shared Iaw Modes Of Two Beamsmentioning

confidence: 99%

Collective stimulated Brillouin scattering with shared ion acoustic wave under the action of two overlapping laser beams

Qiu¹,

Liang²,

Cao³

et al. 2021

Plasma Phys. Control. Fusion

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The overlapping of multiple beams is common in inertial confinement fusion (ICF), making the collective stimulated Brillouin scattering (SBS) with shared ion acoustic wave (IAW) potentially important because of the effectively larger laser intensities to drive the instability. In this work, based on a linear kinetic model, an exact analytic solution for the convective amplification of collective SBS with shared IAW stimulated by two overlapped beams is presented. From this solution, effects of the wavelength difference, crossing angle, polarization states, and finite beam overlapping volume of the two laser beams on the collective SBS modes with shared IAW are studied. It is found that a wavelength difference of several nanometers between the laser beams has negligible effects, except for a very small crossing angle about one degree. However, the crossing angle, beam polarization states, and finite beam overlapping volume can have significant influences. Furthermore, the out-of-plane modes, in which the wavevectors of daughter waves lie in different planes from the two overlapped beams, are found to be important for certain polarization states and crossing angles of the laser beams. This work is helpful to comprehend and estimate the collective SBS with shared IAW in ICF experiments.

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Section: Analysis Of Shared Iaw Modes Of Two Beamsmentioning

confidence: 99%

Collective stimulated Brillouin scattering with shared ion acoustic wave under the action of two overlapping laser beams

Qiu¹,

Liang²,

Cao³

et al. 2021

Plasma Phys. Control. Fusion

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“…Radiation transport is the essential energy transfer process in astrophysics and high-energy-density physics [11,5,12,14]. It is described by a system of nonlinear equations, which includes a kinetic equation modeling the transport of photons and an equation for material energy evolution.…”

Section: Introductionmentioning

confidence: 99%

Unified Gas-Kinetic Particle Method for Frequency-dependent Radiation Transport

Li¹,

Liu²,

Song³

2023

Preprint

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This paper proposes a unified gas-kinetic particle (UGKP) method for the frequency-dependent photon transport process. The photon transport is a typical multiscale process governed by the nonlinear radiative transfer equations (RTE). The flow regime of photon transport varies from the ballistic regime to the diffusive regime with respect to optical depth and photon frequency. The UGKP method is an asymptotic preserving (AP) scheme and a regime adaptive scheme. The teleportation error is significantly reduced, and the computational efficiency is remarkably improved in the diffusive regime. Distinguished from the standard multigroup treatment, the proposed UGKP method solves the frequency space in a non-discretized way. Therefore the Rosseland diffusion system can be precisely preserved in the optically thick regime. Taking advantage of the local integral solution of RTE, the distribution of the emitted photon can be constructed from its macroscopic moments. The Monte Carlo particles in the UGKP method need only be tracked before their first collision events, and a re-sampling process is performed to close the photon distribution for each time step. The large computational cost of excessive scattering events can be saved, especially in the optically thick regime. The proposed UGKP method is implicit and removes the light speed constraint on the time step. The particle tracking approach combining the implicit formulation makes the proposed UGKP method an efficient solution algorithm for frequency-dependent radiative transfer problems. We demonstrate with numerical examples the capability of the proposed multi-frequency UGKP method.

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“…However, the coupling efficiency between laser energy and target fuel can be improved effectively by using broad-band lasers with low temporal coherence. This is not only beneficial for improving the effective absorption of laser by the target and obtaining a higher compression ratio but also helps to suppress the occurrence of parametric instability in large-scale LPI. − A superluminescent diode (SLD) pulse source amplified by a Nd/phosphate glass rod laser system is a very ideal seed source for ICF. Because the spectral characteristics of the pulse will not be affected by pulse time shaping. , …”

Section: Introductionmentioning

confidence: 99%

Rapid Growth of the Gradient Deuterium Deuterated Potassium Dihydrogen Phosphate Crystal

Hao,

Xu,

Sun

et al. 2023

Crystal Growth & Design

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Using broadband lasers is an effective method to suppress laser-plasma instability. In order to achieve efficient broadband third-harmonic generation, a new-type gradient deuterium deuterated potassium dihydrogen phosphate (DKDP) crystal with a gradient refractive index is designed and grown. A gradient deuterium DKDP crystal with a size of 20 × 20 × 80 mm is grown by using the "point-seed" rapid growth method, which has a deuterium content change of 10% along the type-II phase matching direction. The properties of the gradient deuterium DKDP crystal are evaluated by measuring the deuterium gradient distribution, crystalline quality, and transmission spectrum. The gradient deuterium DKDP crystal grown by us provides the possibility for group velocity matching and an efficient conversion process of broadband laser third-harmonic generation.

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Development of low-coherence high-power laser drivers for inertial confinement fusion

Cited by 46 publications

References 110 publications

Collective stimulated Brillouin scattering with shared ion acoustic wave under the action of two overlapping laser beams

Collective stimulated Brillouin scattering with shared ion acoustic wave under the action of two overlapping laser beams

Unified Gas-Kinetic Particle Method for Frequency-dependent Radiation Transport

Rapid Growth of the Gradient Deuterium Deuterated Potassium Dihydrogen Phosphate Crystal

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