Numerical studies on the radiation uniformity of Z-pinch dynamic hohlraum

Wu, Feiyang; Chu, Yong; Ramis, R.; Li, Zhenghong; Ma, Yunlong; Yang, Jiamin; Wang, Zhen; Ye, Fan; Zhi-jian, Huang; Qi, Jianming; Zhou, Lin; Cui, Liang; Chen, Shi-Jia; Ge, Z. Y.; Yang, Xiaohu; Shang-wu, Wang

doi:10.1016/j.mre.2018.06.001

Cited by 18 publications

(3 citation statements)

References 34 publications

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“…The multi-shell target is composed of a deuterium-tritium (DT) fuel, a gold pusher, a gas buffer, a copper driver, a gas buffer and a beryllium ablator. As shown in our previous two-dimensional (2D) simulations for an 8-MA driver [27] and the following results for a 50-MA driver, the foam convertor is able to convert the cylindrical imploding kinetic energy into radiation energy with good uniformity in the hohlraum. It is reasonable to decouple the calculation of hohlraum implosion and target implosion when a two-dimensional code with accurate physical models are not yet available and efficient simulations are expected.…”

Section: Methodssupporting

confidence: 63%

Simulations on the multi-shell target ignition driven by radiation pulse in Z-pinch dynamic hohlraum*

Chen¹,

Ma²,

Wu³

et al. 2021

Chinese Phys. B

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We present the first simulation results of a multi-shell target ignition driven by Z-pinch dynamic hohlraum radiation pulse. The radiation pulse is produced with a special Z-pinch dynamic hohlraum configuration, where the hohlraum is composed of a single metal liner, a low-Z plastic foam, and a high-Z metallic foam. The implosion dynamics of a hohlraum and a multi-shell target are investigated separately by the one-dimensional code MULTI-IFE. When the peak drive current is 50 MA, simulations suggest that an x-ray pulse with nearly constant radiation temperature (∼ 310 eV) and a duration about 9 ns can be obtained. A small multi-shell target with a radius of 1.35 mm driven by this radiation pulse is able to achieve volumetric ignition with an energy gain (G) about 6.19, where G is the ratio of the yield to the absorbed radiation. Through this research, we better understand the effects of non-uniformities and hydrodynamics instabilities in Z-pinch dynamic hohlraum.

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Section: Methodssupporting

confidence: 63%

Simulations on the multi-shell target ignition driven by radiation pulse in Z-pinch dynamic hohlraum*

Chen¹,

Ma²,

Wu³

et al. 2021

Chinese Phys. B

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“…模型; 第3节利用数值模拟程序O-SUKI-N [15] 验证该模型, 并将模型应用于双锥对撞点火方案中的快电子束能量分析; 第4节对全文进行总结. 模拟程序MULTI-2D [16,17] 进行的二维流体力学模拟研究结果表明, 经内爆压缩加速后的等离子体喷流, 对撞后能够形成密度分布较均匀的等容预压缩等离子体 [10,13] , 如图1所示. 高密度等离子体在加热方向(图1水平方向)约的范围内密度较波速近似近似认为激波波速满足平面强激波波速公式:…”

Section: 本文分为4节第2节介绍研究建立的半解析unclassified

Formation of fast-ignition hotspots and propagartion of burning waves in pre-compressed isochoric plasmas

Wang,

Xu,

et al. 2024

Acta Phys. Sin.

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The formation and evolution of hotspots is important to achieve ignition and high energy gain in inertial fusion process. However, most of related studies are carried out on pre-compressed plasmas with an isobaric configuration, studies of evolution of the hotspot in a plasma with an isochoric configuration is relatively rare. In this paper, a semi-analytical model is developed to describe the evolution of the hotspot boundary and propagation of fusion burning waves for a high-density pre-compressed plasma with an isochoric configuration in the double-cone ignition scheme. For the shock wave, the strong shock wave approximation and the quasi-isobaric approximation are reasonable. The quasi-isobaric approximation shows that as the plasma density behind the shock wave increases, the plasma temperature decreases. Because of these, the range of α-particles decreases rapidly behind the shock wave, forming an α-particle absorption peak. Therefore, considering that the hotspot is the main region where α-particles are produced and deposited, the position of the shock peak can be used to identify the boundary of the hotspot in a high-density plasma with an isochoric configuration. It also shows there is a "self-regulating burning process" in the burning process of the isochoric hotspot. α-particles are mostly deposited in the stable region and behind the shock, finally transport through the shock peak and heat the cold fuel when the temperatures rise. In the high-density hotspots of plasma with an isochoric configuration, the deposition of α-particles behaves an obvious non-uniform distribution effect. By analyzing the non-uniform deposition of α-particles, the deposition rate of α-particles at the edge of spherical uniform hotspot is calculated, then the temperature and density evolution of the isochoric hotspot can be well described. The model can be used to estimate the Lawson parameter of the hotspots at the end of the early stage of ignition. It is found that a lower fast electron energy is more beneficial for ignition and high gain operation of fusion plasmas. It is also shown that the high density of the hotspots in the isochoric plasmas will lead to a higher fusion burning rate, which can offset the negative impact of the shock waves and even achieve higher energy gain. The semi-analytical model was verified by the hydrodynamic simulations of O-SUKI-N.

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“…The code MULTI-IFE is used to determine the implosion performance driven by a given laser pulse under spherical symmetry approximation. MULTI-IFE is the onedimensional version of the radiation hydrodynamic program MULTI [27][28][29][30][31], which is used widely in the community of inertial fusion [32][33][34] and high-energy-density physics [35].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Laser Pulse for Double-cone Ignition via Machine Learning

Song

Yang

2022

Preprint

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Double-cone ignition (DCI) scheme is a promising fast-ignition approach for the realization of inertial fusion energy. The optimization of laser pulse plays a key role for the fuel compression required by the high gain fusion burning. In this paper, we employ the genetic algorithm in machine learning to optimize the laser pulse in couple with one-dimensional hydrodynamic simulations for the fuel compression. It is found that quantum degeneracy is beneficial for the achievement of high density compression. Analysis from the dataset indicates that the areal density is strongly proportional to the peak density and implosion velocity. Numerical results also suggest that a peak density of 1000 g/cm 3 and an areal density of 3 g/cm 2 could be achieved with a drive energy of 300 kJ in the configuration of double-cone ignition scheme.

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Numerical studies on the radiation uniformity of Z-pinch dynamic hohlraum

Cited by 18 publications

References 34 publications

Simulations on the multi-shell target ignition driven by radiation pulse in Z-pinch dynamic hohlraum*

Simulations on the multi-shell target ignition driven by radiation pulse in Z-pinch dynamic hohlraum*

Formation of fast-ignition hotspots and propagartion of burning waves in pre-compressed isochoric plasmas

Optimization of Laser Pulse for Double-cone Ignition via Machine Learning

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