Superconducting Magnets, Cryostats, and Cryogenics for the Interaction Region of the SSC

Abstract

The Superconducting Super Collider (SSC) has two counterrotating 20-Te V proton beams that will be made to collide at specific interaction points to carry out high energy physics experiments (see Figure 1). The Collider ring has two sites, West and East, for such Interaction Regions (IRs), and the conceptual design of the East Interaction Region is underway. The East IR, in the present stage of design, has two interaction points, the requirements for which have been specified in terms of distance L* to the nearest (focusing quadrupole) magnet and the beam luminosity. Based on these requirements, the optics for transition from arc regions or utility regions to the IR and for focusing (beta squeeze) the beams have been obtained.¹ The arrangement of superconducting magnets in the IR is shown in Figure 2. The optical arrangement consists of a tuning section of quadrupoles, the strength of which is adjusted to obtain the required beta squeeze; a pair of bending dipoles to reduce the beam separation from the nominal 900 mm to 450 mm; an achromat section of quadrupoles, which consist of two cold masses in one cryostat; another pair of dipoles to bring the beams together at the required crossing angle; and a set of final focus quads facing the interaction point.