关键词: 
α粒子 /
能量沉积 /
慢化效应 /
点火

摘要: 在三温聚变燃烧点模型框架下， 对比氘氚聚变燃烧过程中α粒子能量逐步沉积与瞬时沉积两种描述下等离子体的温度、 离子数密度随时间的变化， 针对不同的密度条件做了计算， 考察了α粒子慢化过程对氘氚聚变点火的影响。 发现考虑了α粒子的慢化过程后， 峰值温度时刻延迟出现， 电子和离子的峰值温度都有所降低。 在相同的初始温度条件下， α粒子的慢化效应在较低的密度条件下对点火有更大的影响。A threetemperature thermonuclear burn model considering the slowingdown effect of alpha particles is presented, with which the temporal evolution of temperature and particle number density are calculated. Comparison with the description that alpha particles deposit their energy instantaneously, calculation shows that the slowingdown effect of alpha particles delays ignition time, makes the maximum of electron and ion temperatures lower and is more remarkable for lower density conditions.