The 45T hybrid insert: recent achievements

The NHMFL hybrid magnet was successfully tested to 45.1 T in an air bore as designed on June 26, 2000. The magnet consists of a cable-in-conduit super conducting outsert producing 14.3 T in a 616 mm bore and a Florida-Bitter r esistive insert providing 30.8 T in a 32 mm bore. The insert was tested wit hout the outsert in May 1999. The combined system was tested in December 19 99 reaching a peak field of 44 T in an air bore. Physics experiments were r un in December 1999 at 45 T using dysprosium pole piece flux concentrators. During the first and second quarters of 2000 modifications were made to th e cryogenic system and the resistive insert. Test results of the resistive insert from December 1999 to June 2000 are presented along with a discussio n of the possibilities of upgrading the insert to reach a total held of 50 T. Scientific experiments are scheduled up to 45 T in a clear bore starting July 3, 2000. A spare set of resistive coils is under construction. (C) 20 01 Elsevier Science B.V. All rights reserved.