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Optimal design of shock ignition target in order to stop generated hot electrons within the cold fuel
Contributions to Plasma Physics ( IF 1.6 ) Pub Date : 2021-05-30 , DOI: 10.1002/ctpp.202100039
Seddigheh Pourhosseini 1 , Abbas Ghasemizad 1 , Somayeh Rezaei 2 , Mohammad J. Jafari 2
Affiliation  

Generation of hot electrons (HEs) within ignitor pulse interaction with pre-compressed fuel is an important challenge in the shock ignition approach. Target optimization in order to prevent the destructive effects of HE is the main goal of the present work. In the first stage, the spectrum of electron energy generated during the interaction of ignitor pulse at different widths with the HiPER pre-compressed target has been estimated by applying particle simulation tool. Then, by changing the thickness of the cold fuel in the range of 185–225 μm, the corresponding areal densities are calculated using 1D hydrodynamic simulations. Finally, in order to assess the energy fusion yield, the iso-gain curves are obtained for different ignitor time windows as well as target thicknesses. Simulation results indicate that by decreasing the baseline, target thickness leads to a 17–70% increase in the fuel areal density. Subsequently, it has been demonstrated that by properly adjusting the parameters of ignitor pulse launch time and its width and employing a target with areal density high enough to stop the HEs, energy gain above 140 can be achieved. Optimal areas for shell thickness and ignitor time window are identified.

中文翻译:

冲击点火靶的优化设计,以阻止冷燃料中产生的热电子

在点火器脉冲与预压缩燃料相互作用中产生热电子 (HE) 是冲击点火方法中的一个重要挑战。目标优化以防止 HE 的破坏性影响是当前工作的主要目标。在第一阶段,应用粒子模拟工具估计了不同宽度的点火脉冲与 HiPER 预压缩目标相互作用期间产生的电子能量谱。然后,通过在 185-225 μm 范围内改变冷燃料的厚度,使用一维流体动力学模拟计算相应的面密度。最后,为了评估能量聚变产额,获得了不同点火器时间窗口和目标厚度的等增益曲线。仿真结果表明,通过降低基线,目标厚度导致燃料面密度增加 17-70%。随后,已经证明,通过适当调整点火脉冲发射时间及其宽度的参数,并采用面密度足够高的目标来阻止 HEs,可以实现 140 以上的能量增益。确定了壳厚度和点火器时间窗口的最佳区域。
更新日期:2021-05-30
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