SUPERCONDUCTING TOROIDAL MAGNET DESIGN FOR THE G0 EXPERIMENT AT TJNAF

An eight coil Superconducting toroidal magnetic spectrometer has been designed for the GO experiment to be performed at Thomas Jefferson Nat ional Accelerator Facility (TJNAF). The toroid is designed so that the particle trajectories pass through the magnet insulating vacuum. The magnet is made of aluminum structural components with a copper stabili zed indirectly cooled conductor. The toroid is 2 meters long, 4 meters outside diameter and is oriented with its major axis horizontal. This orientation allows its use as an eight fold symmetric focusing spectr ometer. The SC magnet has a stored energy of 6.5 Mjoules, The design a nd analysis of this device will be presented. The plans and status of magnet system procurement will be presented. The RFP [1] was issued in May 1996.