ADIABATIC SPIN ROTATOR FOR A LASER-PUMPED POLARIZED HE-3 TARGET

An adiabatic spin rotator has been constructed for use with the TRIUMF optically pumped polarized He-3 target. It consists of two orthogonal pairs of Helmholtz coils allowing adiabatic rotation of the He-3 spin into any arbitrary direction. Thus, the target may be polarized alternately in the sideways, longitudinal, and normal directions allowing measurements of complete sets of spin observables in nuclear scattering experiments during a single experimental run. Recently the system was used to measure all parity-allowed spin correlation observables A00ij in He-3 over arrow pointing right(p over arrow pointing right, p) elastic scattering at 200 and 500 MeV. The system permits reasonably rapid spin reversals (30 s) with minimal polarization losses (< 1 X 10(-5) per spin reversal). This allows the target spin to be reversed frequently during an experimental mn thus reducing systematic uncertainties from variations in the response of other components in the experimental setup.