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在双温聚变燃烧点模型框架下,对比D-T等离子体聚变燃烧过程中α粒子能量逐步沉积与瞬时沉积两种描述的等离子体温度、离子数密度随时间的变化,在不同的密度条件下作了计算,考察了α粒子的慢化过程对D-T聚变点火的影响.发现考虑α粒子的慢化过程后,D-T等离子体峰值温度的出现将会推迟若干皮秒甚至几十皮秒,在较低的初始温度密度条件下,时间推迟得更多些.等离子体的峰值温度比α粒子能量瞬时沉积描述也会下降13keV左右.
Under the dual-temperature fusion point model, the temperature and ion number density of two kinds of plasma, which are gradually deposited and transiently deposited, during the fusion process of DT plasma were compared under different density conditions The influence of the slowing down of α particles on the ignition of DT fusion was investigated and it was found that the occurrence of DT plasma peak temperature would be delayed by several picoseconds or even tens of picoseconds after considering the slowing down of α particles, At the initial temperature densities, the time is postponed a little more, and the peak temperature of the plasma is about 13 keV lower than the instantaneous deposition of the alpha particle energy.