Laser fusion rocket can achieve large thrust and high specific impulse by utilizing huge amount of fusion energy to heat up a propellant. One of the issues of this system is heavy neutron shields which are heated by neutrons. The propulsion performance of a conical target that can reduce neutron radiation to the coil is calculated by numerical analysis. The impulse bits of the spherical and the conical targets are 12 Ns and 0.75 Ns, respectively, and the propellant in the conical target does not contribute to the thrust. This result suggests that the target shape should be optimized to establish both the neutron shielding and large thrust.

中文翻译：

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激光聚变火箭圆锥形靶的数值分析

激光聚变火箭通过利用大量聚变能加热推进剂，可以实现大推力和高比冲。该系统的问题之一是由中子加热的重型中子防护罩。通过数值分析计算出可以减少对线圈的中子辐射的圆锥形靶的推进性能。球形和锥形靶的脉冲位分别为12 Ns和0.75 Ns，并且锥形靶中的推进剂对推力无贡献。该结果表明，应该优化目标形状以建立中子屏蔽和大推力。