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ABSTRACT: A large superconducting cryogen-free magnet has been designed, manufactured and tested. The magnet reached 4.1 T in the 430 mm room temperature bore with a ramp time of 35 min. The magnet is cooled by a two-stage GM cryocooler. The magnet can be rotated on a support frame to be operated with either horizontal or vertical bore. The stored energy of 1 MJ can safely be handled during a quench. Homogeneity, cool down as well as quench properties confirmed the design values. The magnet is now being operated by the end user.
IEEE Transactions on Applied Superconductivity 07/2003; 13(2-13):1569 - 1571. DOI:10.1109/TASC.2003.812776 · 1.24 Impact Factor