STX magnet fabrication and testing to 16 T

A prototype ohmic heating coil for the proposed Spherical Torus Experiment (STX) has been designed, fabricated and successfully tested to 16 T, well above its design operating field and stress levels. The conductor material was Glidcop Al-15 with a copper tube for water cooling soldered into a groove. The magnet winding inner and outer radii were 7.5 cm and 14.2 cm, respectively, and the axial length was 48 cm. The magnet heated to approximately 90/sup 0/C during a pulse and was cooled within 2 min. All design and performance goals were met or exceeded.