Abstract
The vacuum system for the electron storage ring in the Photon Factory project is now under construction. In the beginning, we chose aluminum as the predominant material for the beam duct because of its cooling and forming properties, and ICF flanges for the connections because of its high reliability. These choices compelled us to employ some kind of transition material. Our tests showed that the transition between aluminum alloy (Al) and stainless steel (SUS) can be made either by using an Al-SUS clad plate (by explosion- and diffusion-bonding) or TIG welding with Ag and Ni plates in the spaces between. The vacuum system forms an elliptical ring with circumference of 187 m, and is mainly composed of three kinds of beam ducts and their pumping units. A B-type duct made of Al is installed at every bending magnet section, and has a passage for the distributed ion pump (DIP) along it inner arc wall. Q-type ducts can be classified into two kinds of straight ducts, types a and type b. Type-a duct made of Al is partially indented for the in-situ Ar discharge cleaning electrode, while type-b duct is made of SUS without any additional component. About 28 DIP units, 48 sputter ion pumps and 6 units of roughing pump will be installed around the ring. The design of the rough pumping units is in progress.
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