14.4 m large aperture analysis magnet with aluminum coils

A 14.4 m horizontal field particle analysis magnet, with an aperture 930 mm horizontal × 1200 mm vertical has been designed at Fermilab and is presently under construction. The flux return yoke (1200 t) is fabricated from the yoke of the Nevis cyclotron. The window frame coils provide 813 kA-turns at 4.15 kA. Aluminum conductor, 61.5 mm square, was extruded in 11 m lengths, bent and welded to form turns and layers. The turns were insulated with B-staged epoxy glass tapes cured under pressure.