Design and Development of a Coated Conductor-Based Solenoid
In the framework of the program of development of laboratory superconducting high-field magnets, a coated conductor based high-temperature superconducting (HTS) solenoidal insert coil with a 45 mm clear bore has been fabricated and preliminary tested for the production of a magnetic field of 7 T (in a background field of 13 T) at a temperature of 4.2 K. The HTS winding consists of two separate layer-wound sections with several joints inside. The quench protection of the solenoid based on fast energy extraction, high discharge voltage (up to 600 V) is needed. The discharge can be additionally accelerated by good inductive coupling between HTS sections and its copper mandrels. The HTS winding has successfully passed preliminary tests in subcooled nitrogen and a magnetic field of 1.7 T has been reached at a temperature of 64 K. The possibility of detecting boiling sound based acoustic quench has been demonstrated. Keywords: high-temperature superconducting (HTS) magnet, coated conductor, solenoid, quench, acoustic emission measurements