DESY: polarization measurements and future plans

This paper gives an overview on the state of the art of obtaining polarized beams in the storage rings DORIS II and PETRA. It is shown that in the 5 GeV storage ring DORIS II polarization can be obtained relatively easily and can be used for experimens. The fast polarization build up in combination with th relatively low beam energy makes DORIS to be an ideal machine for spin physics and ideal for a spin rotator providing longitudinal polarization in the interaction regions. In PETRA at energies 3 to 4 times higher than in DORIS II polarization can only be obtained by applying special compensation schemes. The ideas for these schemes and the experimental results are introduced. It is shown that an intelligent use of these compensation schemes can provide a relatively high degree of polarization in machines the size of PETRA and probably also HERA