A Frozen Spin Target with Three Orthogonal Polarization Directions

Abstract A frozen spin target has been designed and constructed at CEN-Saclay for nucleon-nucleon scattering experiments at the synchrotron SATURNE II. In this target, the polarization can be maintained in three directions: vertical, horizontal along the beam, or horizontal perpendicular to the beam. The angle of free access is up to 80° from the forward direction to the left and up to 56° or 43° to the right depending on the magnet configuration; the azimuthal angle is 15°. The magnet system is entirely superconducting. The target of about 70 cm 3 maximum volume is cooled in a vertical dilution refrigerator. A 14 cm 3 target has been used in several experiments with proton and deuteron beams during the 1981–1985 period.