Study and design of hohlraum shape on Shenguang-Ⅲ facility

Longfei, 景龙飞 Jing; Shaoen, 江少恩 Jiang; Yongkun, 丁永坤 Ding; Tianxuan, 黄天晅 Huang; Yunbao, 黄运保 Huang

doi:10.3788/hplpb20142602.22006

Cited by 4 publications

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“…where D H is the diameter of the hohlraum (or one of the six ellipses) at the midplane, L H is the length of the hohlraum or the distance between any two opposite LEHs, and D L is the diameter of the 6 LEHs. The area of each segment of the hohlraum is calculated by the view-factor code IRAD3D [31,32]. The CCR (case-to-capsule ratio) in the non-spherical hohlraums, such as the TAEH, is defined as the ratio of the diameter at the midplane of the hohlraum and the capsule, i.e.…”

Section: Hohlraum Configurationmentioning

confidence: 99%

Comparison of three hohlraum configurations with six laser entrance holes for indirect-drive inertial confinement fusion

et al. 2018

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The radiation drive asymmetry and laser-plasma instabilities (LPIs) inside the conventional cylindrical hohlraum configuration are two daunting issues in indirect-drive inertial confinement fusion. Recently, an octahedral spherical hohlraum (SH) (Lan et al 2014 Phys. Plasmas 21 010704), a novel three-axis cylindrical hohlraum (TACH) (Kuang et al 2016 Sci. Rep. 6 34636), and an advanced three-axis elliptical hohlraum (TAEH) (Jing et al 2017 arXiv:1703.01579) with six laser entrance holes (LEHs) were proposed to mitigate these issues. In this paper, the performance of these three new hohlraum configurations is compared. Preliminary simulations indicate that the TAEH (with a case-to-capsule ratio, CCR = 2.8) could provide excellent radiation symmetry, comparable to those inside the SH (CCR = 5.1) and TACH (CCR = 2.2). The filling time of plasma affecting the LPIs is between those of the SH and TACH, and about 1.5 times the one in the ignition hohlraum Rev5-CH (300 eV) of the National Ignition Campaign (Haan et al 2011 Phys. Plasmas 18 051001). The energy coupling efficiency of the TAEH is about 29% and 17% greater than those inside the SH and TACH, respectively. Moreover, all three configurations have robust symmetry with respect to laser beam pointing errors and capsule offset, with the SH being the most insensitive.

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Section: Hohlraum Configurationmentioning

confidence: 99%

Comparison of three hohlraum configurations with six laser entrance holes for indirect-drive inertial confinement fusion

et al. 2018

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“…The primary tool utilized for this paper is a user-friendly 3D view-factor code named IRAD3D [41,42]. Of necessity, this code makes some simplifying assumptions and approximations about the hohlraum and the capsule.…”

Section: Drive Symmetrymentioning

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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Research of shaped pulse driven hohlraum asymmetry by 2D X-ray radiography

Jiang

Yan

et al. 2019

Physics of Plasmas

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The first implosion tuning experiment with a shaped pulse driven was performed on the SGIII laser facility by using 2D X-ray radiography. Under the careful design, we obtained the driven symmetry both in the picket and peak. The experimental results show that the P2/P0 asymmetry can be tuned by varying the fraction energy in the inner cone both in the picket and peak. The radiation symmetry at the peak is consistent with our simulation. However, the radiation symmetry in first 0.5 ns (picket) had an unexpected negative P2/P0, which is different from the simulation; it may be caused by inner cone absorption in the tent which supported the capsule.

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Study and design of hohlraum shape on Shenguang-Ⅲ facility

Cited by 4 publications

References 0 publications

Comparison of three hohlraum configurations with six laser entrance holes for indirect-drive inertial confinement fusion

Comparison of three hohlraum configurations with six laser entrance holes for indirect-drive inertial confinement fusion

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

Research of shaped pulse driven hohlraum asymmetry by 2D X-ray radiography

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