NbTi split magnet directly cooled by cryocooler

✍ Scribed by S. Masuyama; H. Yamamoto; Y. Matsubara

• Book ID: 103984402
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 265 KB
• Volume: 1
• Category: Article
• ISSN: 0964-1807
• DOI: 10.1016/0964-1807(93)90321-r

✦ Synopsis

The experiment on a single coil directly cooled by a G-M cryocooler has been done to develop a superconducting magnet with several tesla without using liquid helium. The size of the coil was the outer diameter of 140mm, the inner diameter of 30mm and thickness of 39mm. A multifilamentary wire of NbTi wire was wound on a copper bobbin and immersed by wax. The cooldown process and operating conditions were optimized. As a result, the maximum magnetic field of 6.3 T was obtained at 6 K. Then the stored energy and the overall current was 2.9kJ and 286A/mm2, respectively.

The NbTi wire used was made full use of its performance as a superconducting conductor. It was indicated that the critical state of the superconductor at the operated temperature was realized satisfactory.