Design of an 18-T Canted Cosine–Theta Superconducting Dipole Magnet

A multilayer high field dipole magnet has been designed for future particle accelerators. The magnet has eight layers of a
$\hbox{Nb}_{3}\hbox{Sn}$
outsert coil and four layers of a Bi-2212 insert coil (see
Figs. 1
and
2
). The layers are graded, delivering a short-sample field of 17.7 T in a 40-mm bore. The coil layers are of a canted cosine–theta design—with ribs and spars that guide and support the coil windings, shape the field, intercept Lorentz forces, and minimize conductor prestress. We present a general overview of the concept and report on the magnetic and mechanical design including an initial cost estimate and construction plan.