First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole

Huo, Wenyi; Li, Zhichao; Yang, Dong; Lan, Ke; Liu, Jie; Ren, Guoli; Li, Sanwei; Yang, Zhiwen; Guo, Liang; Hou, Lifei; Xie, Xu; Li, Yukun; Deng, Keli; Yuan, Zheng; Zhan, Xun; Gao, Yuan; Zhang, Haijun; Jiang, Baibin; Huang, Lizhen; Du, Keming; Zhao, Runchang; Li, Ping; Wang, Wei; Su, Jingqin; Ding, Yongkun; He, X. T.; Zhang, Weiyan

doi:10.1016/j.mre.2016.02.001

Cited by 41 publications

(6 citation statements)

References 27 publications

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“…Backward stimulated Brillouin scattering (SBS) is a three-wave interaction process where an incident electromagnetic wave (EMW) decays into a backscattered EMW and a forward propagating ion-acoustic wave (IAW). Backward SBS leads to a great energy loss of the incident laser and is detrimental in inertial confinement fusion (ICF) [1][2][3], including indirect-drive ignition [4,5], direct-drive ignition [6,7], shock ignition [8,9], and hybrid-drive ignition [1] with a spherical hohlraum [10][11][12][13] where indirect-drive and direct-drive processes are combined. Therefore, SBS plays an important role in the successful ignition goal of ICF.…”

Section: Introductionmentioning

confidence: 99%

Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

et al. 2019

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The presence of multiple ion species can add additional branches to the IAW dispersion relation and change the Landau damping significantly. Different IAW modes excited by stimulated Brillouin scattering (SBS) and different SBS behaviors in several typical ignition hohlraum plasmas in the high-temperature and high-density region have been researched by Vlasov-Maxwell simulation. The slow mode in HeH or CH plasmas is the least damped mode and will be excited in SBS, while the fast mode in AuB plasmas is the least damped mode and will be excited in SBS. Due to strong Landau damping, the SBS in H or HeH plasmas is strong convective instability, while the SBS in AuB plasmas is absolute instability due to the weak Landau damping. However, although the SBS in CH plasmas is weak convective instability in the linear theory, the SBS will transform into absolute instability due to decreasing linear Landau damping by particles trapping. These results give a detail research of the IAW modes excitation and the properties of SBS in different species plasmas, thus providing the possibility of controlling SBS by increasing the linear Landau damping of the IAW by changing ion species.

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Section: Introductionmentioning

confidence: 99%

Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

et al. 2019

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“…The nonlinearities of ion acoustic waves (IAWs) are of fundamental interest to plasma physics. Understanding the fluid effects and kinetic effects of nonlinear IAWs is of key significant in space physics such as solar wind [1][2][3][4][5] and also stimulated Brillouin scattering (SBS) in inertial confinement fusion (ICF) [6][7][8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Fluid nonlinear frequency shift of nonlinear ion acoustic waves in multi-ion species plasmas in the small wave number region

et al. 2016

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The properties of the nonlinear frequency shift (NFS) especially the fluid NFS from the harmonic generation of the ion-acoustic wave (IAW) in multi-ion species plasmas have been researched by Vlasov simulation. The pictures of the nonlinear frequency shift from harmonic generation and particles trapping are shown to explain the mechanism of NFS qualitatively. The theoretical model of the fluid NFS from harmonic generation in multi-ion species plasmas is given and the results of Vlasov simulation are consistent to the theoretical result of multi-ion species plasmas. When the wave number kλDe is small, such as kλDe = 0.1, the fluid NFS dominates in the total NFS and will reach as large as nearly 15% when the wave amplitude |eφ/Te| ∼ 0.1, which indicates that in the condition of small kλDe, the fluid NFS dominates in the saturation of stimulated Brillouin scattering especially when the nonlinear IAW amplitude is large.

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“…Recently, a spherical hohlraum with 6LEHs [36] and a novel hohlraum with a three-axis cylindrical hohlraum [37,38], all of which utilize a single-cone beam without any supplementary technology of beam phasing, are proposed to improve these issues, especially the propagation of the inner-cone beams. These hohlraum configurations have natural superiority in maintaining high drive symmetry during the entire capsule implosion process [37][38][39]. Notwithstanding, additional LEHs will increase the radiation loss through the LEHs and lead to a lower coupling efficiency from the hohlraum to capsule.…”

Section: Nuclear Fusionmentioning

confidence: 99%

Preliminary study on a tetrahedral hohlraum with four half-cylindrical cavities for indirectly driven inertial confinement fusion

et al. 2017

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A tetrahedral hohlraum with four half-cylindrical cavities (FHCH) is proposed to balance tradeoffs among the drive symmetry, coupling efficiency, and plasma filling of the hohlraum performance for indirectly driven inertial confinement fusion. The peak drive symmetry in the FHCH with a cavity-to-capsule ratio (CCR) of 2.2 is comparable to those in the spherical hohlraum of CCR = 4.5 with six laser entrance holes (6LEHs-Sph.) ((Lan et al 2014 Phys. Plasmas 21 010704) and three-axis cylindrical hohlraum (6LEHs-Cyls.) of CCR = 2.0 (Kuang et al 2016 Sci. Rep. 6 34636) and the filling time of plasma is close to the ones in the 6LEHs-Cyls. and the ignition target Rev5-CH of the national ignition campaign, and about half of that in the 6LEHs-Sph. In particular, the coupling efficiency is about 19% and 16% higher than those of the 6LEHs-Sph. and 6LEHs-Cyls., respectively. Besides, preliminary study indicates that the FHCH has a robust symmetry to uncertainties of power imbalance and pointing errors of laser beams. Furthermore, utilizing the FHCH, the feasibility of a tetrahedral indirect drive approach on the national ignition facility and hybrid indirect-direct drive approach with the laser arrangement designed specially for 6LEHs-Sph. or 6LEHs-Cyls., is also envisioned. Therefore, the proposed hohlraum configuration merits consideration as an alternative route to indirect-drive ignition.

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First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole

Cited by 41 publications

References 27 publications

Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

Fluid nonlinear frequency shift of nonlinear ion acoustic waves in multi-ion species plasmas in the small wave number region

Preliminary study on a tetrahedral hohlraum with four half-cylindrical cavities for indirectly driven inertial confinement fusion

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