Optimization Study On Pulsed Electron Beam In Simulating Thermo-mechanical Effects Of X-ray

The energy produced by the high space nuclear explosions is mainly transmitted in the form of pulsed X-rays from the point of detonation,and a certain range of aircrafts will be damaged.The thermo-mechanic effects of pulsed X-rays are the critical damage to these aircrafts.The energy deposition induced by pulsed X-rays in target materials is the basis of their thermo-mechanic effects.At the present stage,the direct use of high space nuclear explosion to produce high space X-ray environment for real X-ray thermo-mechanical effects test is not possible.In recent years,laboratory simulation,numerical simulation and theoretical analysis have become the basis means for the study of the effects.The mechanism of the thermal-mechanical effects of pulsed electron beam is similar with those of X-ray.And it is an important source for simulating the thermo-mechanical effects of X-ray in the laboratory at present.However,there still exists equivalence problem between them.In this paper,numerical simulation method is used to study the optimization of pulsed electron beam in simulating thermo-mechanical effects of X-ray.The main results are as follows:1)The energy deposition of electron beam and X-ray in target materials has been studied by using MCNP software and various factors affecting energy deposition have been analyzed.In the end,we get a regular understanding of the energy deposition of electron beam and X-ray.2)A new method for the calculation of the energy deposition profile in target materials by pulsed electron beam is presented.Taking account of the divergence of electron beam in its actual motion,the energy deposition in target materials is calculated by setting the maximum divergence angle of electron beam and the probability of electrons which hit the material perpendicularly.For specific experiment equipment and conditions,we can ceaselessly change the divergence angle of electron beam and the probability of vertically incident electrons to calculate its energy deposition,and compare with the corresponding experimental results.Then we may get a certain understanding of the motion of electron beam in the test device.3)The difference of energy deposition profiles in target materials of electron beam with multi-energy composite spectrum and X-ray is compared.Based on the variation of the energy deposition profile in target material inside the target material,the way of radiation about electron beam is optimized.