[en] The AmPS ring is a 900 MeV electron pulse stretcher and storage ring with a circumference of 212 m. An overview is presented of the design philosophy and the construction with emphasis on the vacuum components as well as on the alignment system and on the supports for the magnets and the monitors. The vacuum chambers in the bending sections are fabricated from stainless steel with a very low cobalt content. An advanced welding and cleaning technique have been developed to avoid the inclusion of impurities. The vacuum pump capacity and the pump distribution along the ring has been optimised as function of local conductances and outgassing. (author) 5 refs.; 7 figs