Formation of hot spots at end-on pre-compressed isochoric fuels for fast ignition

Xu, Zekun; Wu, Fuyuan; Jiang, Bofang; Kawata, Shigeo; Zhang, Jie

doi:10.1088/1741-4326/ad08e6

Cited by 3 publications

(2 citation statements)

References 39 publications

(61 reference statements)

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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

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

“…但是, 对等容构型预压缩等离子体中的热斑点火的研究尚不充分, 如何定义等容构型等离子体中的热斑也尚未明确. 随着双锥对撞点火方案 [3,[10][11][12][13][14] 等基于等容预压缩等离子体的新型点火方案的发展, 研究等容预压缩等离子体中的热斑点火过程愈发重要.…”

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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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Non-equilibrium and self-organization evolution in hot-spot ignition processes

Fu,

Guo,

Wang

et al. 2024

Physics of Plasmas

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In inertial confinement fusion systems, achieving ignition can be pursued through two main approaches—central hot-spot ignition and fast ignition. Due to disparate formation mechanisms in these methods, the initial temperatures of electrons and ions in the hot spot often differ, highlighting the limitations of equilibrium theoretical models in accurately capturing the ignition conditions and evolution of the hot spot. In this work, we present a non-equilibrium model and extended this model to both isobaric and isochoric scenarios, characterized by varying hot-spot densities, temperatures, and expansion velocities. In both cases, a spontaneous self-organization evolution was observed, manifesting as the bifurcation of ion and electron temperatures. Notably, the ion temperature is particularly prominent during the ignition process. This inevitability can be traced to the preponderant deposition rates of alpha-particles into D–T ions and the decreasing rate of energy exchange between electrons and D–T ions at elevated temperatures. The inherent structure, characterized by higher ion temperature and lower electron temperature during ignition, directly contributes to the augmentation of D–T reactions and mitigates energy losses through electron conduction and bremsstrahlung, thereby naturally facilitating nuclear fusions.

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On the ignition of H11B fusion fuel

Ghorbanpour,

Belloni

2024

Front. Phys.

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We have revisited recent results on the ideal ignition of H11B fuel, in the light of the latest available reactivity, an alternative self-consistent calculation of the electron temperature, an increased extent of the suprathermal effects and the impact of plasma density. At high density, we find that the ideal ignition temperature is appreciably relaxed (e.g., Ti≃150 keV for ni∼1026 cm−3 and an optimal 11B/H concentration ε=0.15) and burn becomes substantial. We have then investigated central hot-spot ignition in both isobaric and isochoric inertial confinement configurations. Although implosion-driven ignition appears to be unfeasible, the isochoric self-heating conditions foster favourable preliminary conclusions on the utilization of proton fast ignition. In the isochoric case, we find a broad minimum in the ignition energy at ρR≃8.5 g/cm2 and 220≲Ti≲340 keV (80 ≲Te≲95 keV), for ε=0.15.

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Formation of hot spots at end-on pre-compressed isochoric fuels for fast ignition

Cited by 3 publications

References 39 publications

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

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

Non-equilibrium and self-organization evolution in hot-spot ignition processes

On the ignition of H11B fusion fuel

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