DCT magnet field quality fine tuning optimization method and design mode

The invention discloses a DCT (Discrete Cosine Transform) magnet field quality fine tuning optimization method and a design mode, and conductor angle distribution of a DCT coil in a tangent plane is controlled by adjusting a stream function, so that optimization of a magnetic field is realized. The method comprises the steps of fine adjustment of a main pole flow function, correction of setting of the main pole flow function and design of the multi-pole combined magnet, high-precision optimization of the magnetic field can be achieved, and the quality and stability of the magnetic field are improved. In addition, the invention further provides a design mode of the fixed-proportion multi-pole combined magnet, the DCT coil type magnet meeting special requirements can be rapidly generated, and the design efficiency is greatly improved. The method has the advantages that a DCT magnet design mode is provided, and a more convenient solution is provided for physical demand conditions with special field form requirem