C bakeout temperature, and cost; therefore, different shield materials were used for different shield components and locations. The shielding is divided into three areas: (0) torus shielding around the vacuum vessel, (0) duct shielding around the vacuum pumping ducts and vertical diagnostic ducts, and (0) penetration shielding in and around the radial ports. The major shield components include water between the walls of the vacuum vessel, lead monosilicate/boron carbide tiles that are attached to the exterior of the vacuum vessel, shield plugs that 