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Asian Regional Team for ILC Accelerator Development
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The first "dumb-bell", which was built with half-cups of niobium sheets that have been forged by using the new press machine at the cavity production test plant of KEK. A dumb-bell refers to an object, which is made of a pair of half-cups, facing each other at their irises where they are electron-beam welded. A nine-cell cavity would then be built by joining eight such dumb-bells and two units of endgroup cells. The dumb-bell shown here was electron-beam welded at a contractor's site for studying the adequate parameters for the welding operation. The work will continue to exercise the manufacturing technique with a new electron-beam welding machine which is expected to be installed at KEK in early 2011.
Archives of the images from the past top pages.