Four magnet cartridge axial supports (e.g. 61, 63, Fig.4) are provided to prevent axial motion between the magnet cartridge (17) and the surrounding vacuum vessel (13). Each axial support includes two high strength steel rods (65) in parallel. The rods are brazed to a bar (67) on one end which mounts (23) to the magnet cartridge (17). The other end of the rods is brazed to a threaded stud (75) which is secured (77) to a bracket (81) secured to the vacuum vessel (13).