摘要
在原子蒸气激光同位素分离工程 (AVLIS)中 ,金属受电子束的加热而熔化 ,并向真空蒸发 ,蒸气原子通过电子束的过程中 ,可能与电子发生非弹性碰撞 ,被激发到高能级 .在膨胀的过程中 ,高能级的原子通过与原子的非弹性碰撞消激发 ,将原子内的电子能量转换为蒸气的平动能 .为了分析电子束与原子作用对蒸气的密度、速度和温度等物理特性的影响 ,采样直接模拟蒙特卡罗法 (DSMC)模拟钆原子蒸发过程 .模拟结果表明 ,电子束与原子的作用使得原子蒸气的速度增加 ,密度减小 。
In atomic vapor laser isotope separation (AVLIS), the metal is heated to melt by electron beams. The vapor atoms may be excited by electrons when flying through the electron beam. The excited atoms may be deexcited by inelastic collision during expansion. The electronic energy transfers translational energy. In order to analyse the effect of reaction between atoms and electron beams on vapor physical parameters, such as density, velocity and temperature, direct simulation Monte Carlo method (DSMC) is used to simulate the 2 D gadolinium evaporation from long and narrow crucible. The simulation results show that the velocity and temperature of vapor increase, and the density decreases.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第10期2286-2290,共5页
Acta Physica Sinica
基金
国家"九五"科技攻关项目 (批准号 :96 A18 0 1 0 2 )资助课题~~
