Design and manufacture of a nbjsn 16t demountable insert solenoid for a high field testing system

A. Della Corte, R. Bmzzese, S. Chiarelli, M. Spadoni

Research output: Contribution to journalArticle


In the framework of the characterization and quality control of the NbjSn strand for (he manufacturing of the ITER (International Thermonuclear Experimental Reactor) Model Coils, the Applied Superconductivity Laboratory at ENEA (Ente per le Nuove Tecnologie Encrgia Ambiente) Frascati decided to increase the background field of its facility for Ic measurements from 14.5 T up to 16 T. The upgrade was obtained by an insert coil designed and manufactured by Ansaldo CRIS (Consorzio Rice relic Innovative per il Sud), Naples, Italy. The NbjSn strand provided by Europa Metalli is an internal tin diffusion high critical current density 0.90 mm wire with the following characteristics: Ic=160 A @ 4.2 K, 16.5 T; Cu/nonCu ratio I. The solenoid (outer diameter 80 mm, inner bore 37 mm) was manufactured by winding the insulated Nb3Sn strand onto an AISI 316L stainless steel former and reacting it up to 650°C. A self consistent unit lias then been assembled, consisting of the insert module, mechanical structure and separate current leads. This allows easy installation of the insert inside the 14.5 T, 80 mm background magnet; removal is possible also in cold conditions without damage. The operational current (113.7 A) was achieved at the first energization with a maximum field on the windings of 16.49 T. This test has been done connecting electrically in series the background magnet and the insert, being therefore limited by the maximum allowable current (114 A) in the background magnet. Further tests with an independent current supply to the insert will be carried out to evaluate its performance limits. © 2000 IEEE.
Original languageEnglish
Pages (from-to)458461 -
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - Mar 2000
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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