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

Longfei Jing, Shaoen Jiang, Longyu Kuang, Hang Li, Lu Zhang, Liling Li, Zhiwei Lin, Jianhua Zheng, Yunbao Huang, Tianxuan Huang2018年被引用 5Nuclear FusionIF 3出版社

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. Plasmas21 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. Plasmas18 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.

日本語訳

従来の円筒型ホーラム構成における放射駆動非対称性とレーザープラズマ不安定性(LPIs)は、間接駆動慣性核融合における2つの困難な問題である。近年、これらの問題を軽減するために、6つのレーザー入射孔(LEHs)を有する八面体球状ホーラム(SH)(Lan et al 2014 Phys. Plasmas21 010704)、新しい三軸円筒型ホーラム(TACH)(Kuang et al 2016 Sci. Rep. 6 34636)、および先進的な三軸楕円型ホーラム(TAEH)(Jing et al 2017 arXiv:1703.01579)が提案された。本論文では、これら3つの新しいホーラム構成の性能を比較する。予備シミュレーションは、TAEH(ケース対カプセル比、CCR  =  2.8)が、SH(CCR  =  5.1)およびTACH(CCR  =  2.2)内部のものに匹敵する優れた放射対称性を提供できることを示している。LPIsに影響を与えるプラズマの充填時間は、SHとTACHのそれらの間であり、国立点火キャンペーンの点火ホーラムRev5-CH(300 eV)(Haan et al 2011 Phys. Plasmas18 051001)におけるものの約1.5倍である。TAEHのエネルギー結合効率は、SHおよびTACH内部のものよりそれぞれ約29%および17%大きい。さらに、3つの構成すべてが、レーザービームのポインティング誤差とカプセルオフセットに関して頑健な対称性を有しており、SHが最も鈍感である。

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