Indirect drive inertial confinement fusion experiments with convergence ratios below 17 have been previously shown to be less susceptible to Rayleigh–Taylor hydrodynamic instabilities, making this regime highly interesting for fusion science. Additional limitations imposed on the implosion velocity, in-flight aspect ratio and applied laser power aim to further reduce instability growth, resulting in a new regime where performance can be well represented by one-dimensional (1D) hydrodynamic simulations. A simulation campaign was performed using the 1D radiation-hydrodynamics code HYADES to investigate the performance that could be achieved using direct-drive implosions of liquid layer capsules, over a range of relevant energies. Results include potential gains of 0.19 on LMJ-scale systems and 0.75 on NIF-scale systems, and a reactor-level gain of 54 for an 8.5 MJ implosion. While the use of 1D simulations limits the accuracy of these results, they indicate a sufficiently high level of performance to warrant further investigations and verification of this new low-instability regime. This potentially suggests an attractive new approach to fusion energy. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.

中文翻译：

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低收敛比直驱惯性约束聚变内爆的一维流体动力学模拟


收敛比低于 17 的间接驱动惯性约束聚变实验先前已被证明不易受到瑞利-泰勒流体动力学不稳定性的影响，使得这种机制对于聚变科学非常有趣。对内爆速度、飞行中的纵横比和应用的激光功率施加的额外限制旨在进一步减少不稳定性的增长，从而形成一种新的状态，其中性能可以通过一维（1D）流体动力学模拟来很好地表示。使用一维辐射流体动力学代码 HYADES 进行了模拟活动，以研究在一系列相关能量下使用液体层胶囊的直接驱动内爆可实现的性能。结果包括 LMJ 规模系统的潜在增益为 0.19，NIF 规模系统的潜在增益为 0.75，8.5 MJ 内爆的反应堆级增益为 54。虽然一维模拟的使用限制了这些结果的准确性，但它们表明了足够高的性能水平，足以保证对这种新的低不稳定状态进行进一步的研究和验证。这可能暗示了一种有吸引力的聚变能源新方法。本文是讨论会议问题“高增益惯性聚变能的前景（第 2 部分）”的一部分。