AN ALUMINUM VACUUM CHAMBER FOR THE BENDING MAGNET OF THE SRRC SYNCHROTRON LIGHT-SOURCE

A bending magnet vacuum chamber of the SRRC synchrotron light source has been studied. The A6061-T6 aluminum alloy was chosen as the chamber material, and a numerical-controlled oil-less machining process was applied for the fabrication. The AES and SIMS surface analysis methods have been applied to analyse the contaminations on the surface of this chamber. After a TIG welding process, the deformation of this chamber was less-than-or-similar-to 0.3 mm per meter length. The 'concentrated' pumping method was designed and a distributed ion pump was also built in this chamber. A static vacuum of less-than-or-equal-to 1 x 10(-10) torr has been reached after a bakeout of 150-degrees-C. In addition to the above-mentioned works, the residual gases of the system and the pumping speeds of the distributed ion pump were also measured.