Superconducting magnet system for the N-N polarized beam-target experiment at Saclay

A polarized beam-target experiment is installed at Saclay, using 4 superconducting magnets. The "frozen-spin" target is equipped with three independent magnets, one for polarizing and the other two for holding the polarization either in a vertical or an horizontal direction. The high uniformity polarizing magnet can be moved down after the polarization has been set so that a large solid angle is left free around the target for physics accessibility. In addition, a "spin-flip" solenoid is placed on the polarized beam issued from the accelerator. This solenoid provides a field integral of 11 T × m over a 2 m length and a useful bore of 10 cm. It operates with a persistent switch of a new concept with automatic control.