Development of remountable joints and heat removable techniques for high-temperature superconducting magnets. (20th December 2017)

• Record Type: Journal Article
• Authors: Hashizume, H.; Ito, S.; Yanagi, N.; Tamura, H.; Sagara, A.
• Is Part Of: Nuclear fusion. Volume 58:Number 2(2018:Feb.)
• Publication Date: 2017-12-20
• Subjects: high-temperature superconductor -- helical fusion reactor -- remountable HTS magnet -- joint-winding -- mechanical joint -- porous media -- heat transfer correlation; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/aa874f
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Segment fabrication is now a candidate for the design of superconducting helical magnets in the helical fusion reactor FFHR-d1, which adopts the joint winding of high-temperature superconducting (HTS) helical coils as a primary option and the 'remountable' HTS helical coil as an advanced option. This paper reports on recent progress in two key technologies: the mechanical joints (remountable joints) of the HTS conductors and the metal porous media inserted into the cooling channel for segment fabrication. Through our research activities it has been revealed that heat treatment during fabrication of the joint can reduce joint resistance and its dispersion, which can shorten the fabrication process and be applied to bent conductor joints. Also, heat transfer correlations of the cooling channel were established to evaluate heat transfer performance with various cryogenic coolants based on the correlations to analyze the thermal stability of the joint.