Electromagnetic design and stress analysis of an 8 T no-insulation HTS insert coil for 20 T magnet.

• The design scheme and stress analysis of an HTS insert coil. • The stress problem caused by screening current effect. • The stress-strain distribution of the HTS insert coil. An 8 T no-insulation (NI) high temperature superconducting (HTS) insert has been designed using a 12 T low temperature superconducting (LTS) magnet to build a 20 T magnet. This paper focuses on the electromagnetic design and stress analysis of the 8 T HTS insert coil. The preserve elitist genetic algorithm was adopted to design a coil with the least cost in conjunction with the finite element program. The pre-stress during the winding, the thermal stress during the cooling down, and the electromagnetic stress considering screening current effect during the charging of the HTS insert coil were analyzed and discussed in this paper. [ABSTRACT FROM AUTHOR]