Abstract
We constructed a superconducting magnet with an inner diameter of 110mm, outside diameter of 720mm, and 750mm in height, wound from multifilamentary superconductors using a react-and-wind method in the Research Institute of Superconducting Magnet [RISM] of Kyushu University. While we succeeded in energizing this magnet up to 16.2 tesla and 6.3MJ at 4.2K without a quench early this year, we further fabricated an insert booster magnet to get a higher magnetic field. This insert booster magnet was wound from a Nb 3 Sn(+Ti) conductor in a wind-and-react method, because the dimensions were only 34mm for inner bore, 98mm for outerside dimameter and 192mm in height. When this magnet was installed in the above-mentioned magnet, the whole magnet produced 17.1 tesla at 4.2K without quenching, which is a new record as a magnet made of multifilamentary conductors.
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