Fabrication and test of Nb3Sn racetrack coils at high field

A program based on exploring the benefits of racetrack coil designs for uti lization of brittle superconductors to achieve high fields is underway at L BNL. As an intermediate step in the experimental program, a set of Nb3Sn ra cetrack coils, using state-of-the-art conductor, have been built and tested . Tile coils were configured to maximize the field, providing a means to st udy the effects of stress on conductor performance. In addition, several de sign improvements mere added which will be implemented ill the nest step of the program; construction of a racetrack dipole with a field of 14 Tesla. An evaluation of the design modifications and test results are given.