Interaction region design for Beijing Tau-Charm Factory

Beijing /spl tau/-Charm Factory (BTCF) is compatible with three modes of operation: high luminosity mode, longitudinal polarization mode and monochromator mode. It consists of two rings, one above another, with one interaction point (IP). This paper will describe the overall design of the BTCF interaction region (IR). A cryostat which contains an anti-solenoid (A-S), a shield solenoid (S-S) and two focusing quadrupoles (Q1,Q2) will be installed at each side of the IP. Design parameters of these iron free superconducting magnets A-S, S-S, Q1, Q2 and the supporting system for these IR magnetic elements will be described. The IR vacuum chamber, the background issues which related to synchrotron radiation and lost particles will be described also.