Cost-effective high-field magnets for future accelerators

We describe a modification of the traditional cos/spl theta/ accelerator magnet design that substantially reduces the cost of manufacture of accelerator magnets. Instead of the Rutherford type cable, a round multi-strand cable is used. This cable is placed in precisely formed grooves in cylindrical surfaces or flat plates that are then nested together to form the coil assembly. Cost reductions are achieved by the elimination of expensive coil end parts, coil wedges and spacers, collars, and coil molding equipment. Also, conductor stress management is obtained by having each conductor supported in its own groove and thus there is no need for application of azimuthal pre-stress to the coil. Thus, coil sizing measurements and collaring press operations are eliminated. We describe an example design for such a magnet to operate at 6.6 T and show a performance and cost comparison to the 6.6 T dipole that was developed for use in the SSC.