Optimizing Designing Of The Hohlraum And Its Performance In Laser-driven Fusion

The research of inertial confinement fusion is an important way to solve human energy crisis and environment pollution.Laser indirect-dirve inertial confinement fusion is an important fusion approach.The design of hohlraum plays an important role in indirectdrive fusion,which is helpful to improve the radiation symmetry and energy coupling efficiency.To improve the radiation symmetry and energy coupling efficiency,the paper studies the configuration of the frustum-cylinder hohlraum.The main research contents are as follows:Firstly,the performance of the frustum-cylinder hohlraum was studied by numerical simulations.The radiation field temperature and radiation uniformity are improved by optimizing the geometric configuration.It is shown that the angle of frustum has a significant influence on the radiation symmetry.When the angle is 45 degrees,the hohlraum is similar to sphere,and the radiation field is more uniform.The influence of case-capsule ratio for hohlraum was studied.Considering the radiation symmetry and energy coupling efficiency,it is found that the best case-capsule ratio is 3.Secondly,compared with the cylindrical hohlraum,the advantages of the frustumcylinder hohlraum were discussed.It is shown that the plasma filling time of the frustumcylinder hohlraum is reduced by 16%,and the surface has 10% less than the cylindrical hohlraum,which helps to construct a uniform radiation field and improve the symmetry of capsule.The low plasma filling time could reduce the loss of laser energy,and energy coupling efficiency is increased by 5%.Investigation indicate that the frustum-cylinder hohlraum have better integrated performance.