Losses of superconducting conductors for Large Helical Device

A numerical calculation of pulsive losses in the superconducting conductor to be used for the large helical coil system of the Large Helical Device (LHD) project was performed. The monolithic conductors of the pool-cooled type are stabilized by a large amount of aluminium. A study was made of four kinds of R&D conductors in different locations and of different aluminium stabilizer shapes. It was found that the value of the losses depends not only upon these factors but also upon the cabling condition of the superconducting strand bundle. Optimization of the conductor design is proposed