Current design of the SSC interaction regions

We review the important changes made to the optics of the interaction regions (IRs) in the collider since the conceptual design (SCDR) of 1990. The most significant modification is a new procedure for the β squeeze. Three additional families of independently powered quadrupoles change the optics from injection to collision while the strengths of the final focus triplet quadrupoles are held constant. The phase advance from the interaction point (IP) to the arc quadrupoles is optimised to provide more effective positions of the local correctors for the IR. Two secondary foci where the IP is imaged have been incorporated symmetrically on both sides of the IP. Other changes include a significant reduction in the β_peak at injection, optimized configuration of the M=-I section, quadrupoles with 5 cm bore, minimized number of quad families, standard design of the vertical bends and reduced total length of the magnets. The optics allows for a wide range of values for a detector space at each IP. The time scenario for the β squeeze is considered as well