电子枪功率与束宽对金属原子蒸气特性的影响

在原子法激光同位素分离工程中,电子枪加热金属铀产生的原子蒸气的密度、速度以及温度等宏观量分布特性是非常重要的参数.为了分析电子枪功率和束宽对原子蒸气密度、速度、温度、质量通量和速度分布等物理特性的影响,采用直接MonteCarlo方法用柱坐标模拟了铀原子平面蒸发动力学过程.在电子枪加热方式下,蒸发源温度场不均匀,而且温度场随电子枪功率和束宽变化.着重研究这种变化对蒸气各种物理特性的影响.模拟结果表明,电子枪功率越高,蒸气径向宏观漂移速度越大,蒸发量越大;电子束束宽越窄,蒸发量越大.关键词：金属蒸发原子法激光同位素分离直接MonteCarlo电子枪

The influence of electron gun''s power and electron beam''s width on metal atom vapor physical parameters

The density, velocity and temperature distribution of the atomic flow are very important parameters in atomic vapor laser isotope separation (AVLIS). In order to analyse the influence of electron gun's power and electron beam's width on vapor physical parameters, such as density, velocity, temperature, mass flux, velocity distribution function, direct-simulation Monte Carlo method (DSMC) is used to simulate the two-dimensional metal evaporation from long and narrow crucible. By the electron-gun heating method, the temperature of evaporation source is not uniform. It is changed by the electron gun's power and electron beam width. Our research focuses on the changes of the physical parameters of atomic flow during the changes of the electron gun's power and the electron beam's width. The simulation results show that the larger the power of electron gun, the higher the radial velocity and the mass flux of vapor. The narrower the width of the electron beam, the higher the mass flux of vapor.