摘要:
在入射粒子和等离子体相互作用物理学基础上，采用蒙特卡罗方法计算了常温和10 keV下，电子、氢、氘、氚和氦粒子在500 g/cm3纯氘等离子体中的能量损失、射程，以及在和燃料直径为50 m，在边缘、中心点火两种方式下的能量沉积时间，得出燃料约束时间为20 ps条件下的束流强度。实现快点火的边缘(中心)点火要求的最低入射束流强度：电子束为363(458) MA，质子束为187(355) MA，氘束为13.1(24.8) MA，氚束为10.9(20.9) MA，氦束为9.34(17.0) MA。单个粒子在边缘(中心)点火的最长能量沉积时间分别为电子0.036(0.078) ps，质子0.219(0.569) ps，氘0.241(0.651) ps，氚0.320(0.854) ps，氦0.228(0.592) ps，均小于燃料约束时间。数据的分析表明,入射粒子射程的末端设计在加热区，可以有效提高加热效率，同时也可以降低需要的束流强度。点火需要的最低总能量，应通过增加入射粒子的流强来实现。
Abstract:
The interaction physics between energetic particle and plasma are introduced. The energy loss, range and pass-through time of energetic electron, proton, D, T or He in pure D plasma of 500 g/cm3 in density and 50 m in diameter at room temperature or 10 keV were calculated by Monte-Carlo method. The results show that, for electron, proton, D, T or He beam, the lowest beam intensity needed for edge(center) igniting is 363(458), 187(355), 13.1(24.8), 10.9(20.9) or 9.34(17.0) MA, respectively; the longest time for single particle to pass through plasma is 0.036(0.078), 0.219(0.569), 0.241(0.651), 0.320(0.854) or 0.228(0.592) ps, respectively. All the time above is below the fuel confinement time. Because of the Bragg peak of energy loss curve or higher energy loss, the end of particle range should be located in the heating zone to improve the heating efficiency and lower the bunch intensity needed for ignition. The lowest energy for ignition should be realized by increasing bunch intensity.
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