A.l.a. - A 1.2 GeV High Luminosity Electron-Positron Storage Ring. Design Study

High electron-positron collision luminosity in the energy range between .5 and 1.2 GeV seems desirable in view of the results from recent experiments on existing e+e- storage rings. The optical structure of a ring, 70 m long with a 2.5 m bending radius is presented: low-ß insertions and va riable optics give a peak luminosity of 1.4×1031 cm-2s-1 at top energy for ξM=.06; luminosity is designed to stay higher than 1.5xl030over the whole energy range. Design criteria, optical structure, apertures, injection, RF system, magnets and vacuum are described.