Probing spin structure of nucleons in scattering of polarized real gamma beam on polarized nuclear targets

The proposal for measurement of polarized gluon and quark distributions in the scattering of a polarized real γ beam on a polarized nuclear target has been considered. A high energy γ beam is obtained by backscattering of a laser beam off electrons from ring and linac type accelerators. Requirements for lasers and design problems are discussed and some process exaples are given.