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20101204Di-0065m.jpg

20101204Di-0008m.jpg

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.


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Last modified: Thu Dec 9 07:54:58 JST 2010