Selection of magnetic screens by numerical calculations

To choose the parameters of magnetic screens, a technique for numerically calculating the 3D magnetic field distribution is developed for the case when field sources are locates in open regions. The problem is solved in vector magnetic potential by the finite integration method. A modification of the method of perfectly matched absorbing boundary layers for the case of magnetic field allows calculation of the field in real 3D screens. The numerical solutions are tested using absorbing layers by comparing with the known analytical solutions. The parameters of finite-size screens effectively decreasing the magnetic field intensity are found.