Optimal choice of a target for producing e+e- polarized beams for a linear collider

For polarized particles generation with the help of radiation from helical wiggler, applicable in linear collider, new calculations are represented. This calculations are made with the codes UNIMOD2, CONVER and OBRA, concerning the choice of optimal thickness and form of the target for different energy of initial beam. Optimized target gives maximal yield of polarized particles. Heating conditions of the target are described also. Estimations were made also how to test this method of particle production at SLAC Linac. 18 refs.; 16 figs.; 13 tabs