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.