Title :
High Temperature Superconducting (HTS) Coils for a Compact Spherical Tokamak
Author :
Melhem, Ziad ; Ball, Steven ; Brzakalik, Robin ; Chappell, Steve ; Gryaznevich, Mikhail ; Hawksworth, David ; Jedamzik, Dieter ; Jokinen, Antti ; Kingham, David ; Sykes, Alan ; Twin, Andy
Author_Institution :
Oxford Instrum., Oxford, UK
Abstract :
High temperature superconductors (HTSs) have the potential to impact the future development of superconducting applications for research magnets in physical sciences and industrial products. A compact spherical tokamak of major radius 25 cm has been designed and engineered using the second generation HTS material, REBCO tapes. It was developed with the primary objective to test out the feasibility of a fully superconducting device made entirely from HTS materials and hence be the first tokamak to demonstrate the practicality of this new medium operating at temperatures above 4.2 K. The tokamak has 6-D shaped toroidal field coils, and two poloidal field coils, each of which is wound in a pancake geometry. Each coil is made in one continuous winding and the coils are assembled together. Results of initial coils and magnet cooling and energisation will be presented.
Keywords :
Tokamak devices; barium compounds; high-temperature superconductors; rare earth compounds; superconducting coils; superconducting magnets; superconducting tapes; 6D shaped toroidal field coils; HTS coils; REBCO tapes; compact spherical Tokamak; continuous coils; continuous winding; high temperature superconducting coils; magnet cooling; magnets; pancake geometry; radius 25 cm; second generation HTS material; superconducting device; two poloidal field coils; Coils; Cooling; High-temperature superconductors; Plasma temperature; Superconducting magnets; Tokamaks; Windings; Fusion; HTS; REBCO; TEST COILS; high temperature superconductor (HTS); small tokamak; test coils;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2014.2375512
