An iterative continuation method for three-component magnetic field is presented.It aims at downward continuation of three-component magnetic field.The fields on those points with same horizontal coordinates are related by differential calculus.As divergence and rotation of three-component magnetic field are taken into consideration,vertical derivatives can be described with horizontal derivatives.As three-component magnetic field on an upper plane is known,magnetic fields on lower planes can be computed with an iterative procedure.Efficiency and accuracy are illustrated by applications.

The CT technique applied to ICF has been developed and a three dimensional (3D) image reconstruction program(CT3D) was performed.The program CT3D is used to numerically study the 3D reconstructed images of target's plasma by using a multiplicative algebraic reconstruction technique (MART) from five pinhole camera images obatined along different sight directions on ‘Xingguang Ⅱ’ device,so that 3D images of ICF's tagets are obtained.The simulated results show that the CT technique can be applied to ICF experiments.