SPIN-DEPENDENT SCATTERING OF POLARIZED PROTONS FROM A POLARIZED HE-3 INTERNAL GAS-TARGET

We describe the first experiment to use a polarized internal gas targe t and polarized beam in a storage ring. A laser optically pumped polar ized He internal gas target has been used with circulating beams of 19 7-414 MeV polarized protons to carry out an extensive set of measureme nts of spin dependent scattering. A large acceptance non-magnetic dete ctor system consisting of wie-chambers, scintillators and microstrip d etectors was used to detect protons, neutrons, deuterons, and He-3 nuc lei from the beam-target interaction. It is demonstrated that these te chniques result in low backgrounds (< 1%) due to scattering from speci es other than the polarized target gas and allow detection of low ener gy recoiling nuclei. Specific issues such as interfacing the experimen t to the storage ring and monitoring the luminosity and polarizations are discussed in detail.