脉冲离子束作用下的靶温度场-应力场耦合分析

Coupling analysis of the target temperature and thermal stress due to pulsed ion beam

靶温对无冷却装置的密封式中子发生器的靶寿命有重要影响。为对脉冲离子束作用下靶进行热-力耦合分析,采用以时-空二维高斯轴对称分布的功率密度为热源的间接耦合的有限元方法,获得了不同脉冲离子束工作状态下的靶温度场和应力场有限元分析结果。结合密封式中子发生器的靶温要求和热应力引起的靶膜热-力破坏效应,优化了密封式中子发生器中的脉冲离子束工作参数。

Background： Target temperature has an important effect on the target life for the sealed neutron generator without cooling system. Purpose： To carry out the thermal-mechanical coupling analysis of the film-substrate target bombarded by the pulsed ion beam. Methods： The indirect coupling Finite Element Method （FEM） with a 2-dimensional time-space Gaussian axisymmetric power density as heat source was used to simulate the target temperature and thermal stress fields. Results： The effects of the target temperature and thermal stress fields under difference pulse widths and beam sizes were analyzed in terms of the FEM results. Conclusions： Combining with the temperature requirement and the thermal stress inducing film thermal mechanical destruction effect of the sealed neutron generator film-substrate targets, an optimized pulsed ion beam work status was proposed.