A Procedure for Axisymmetric Winding Design under Parametric Constraints: an Application to the RFX Poloidal Transformer

An automated optimal design method for the design of inductors for levitation or molten metal confinement is presented. It can modify the geometry of the inductor systems which produce the exciting electromagnetic field, until a specified performance is achieved. A number of constraints can be taken into account, related both to technical parameters, such as induction thickness and conductor cross-sections, and to designer choices aimed at directing the optimization process toward preferential solutions. Global and local equilibrium equations are used for levitation and confinement. The algorithm operates as a relaxation method, modifying the turn positions one at time, step by step. At every step the nonlinear inverse problem is linearized and solved as a least-square problem and the performance of the solution is checked. A second-order parabolic interpolation is used if the least-square solution is not satisfactory. Examples of applications are discussed