Abstract

JT-60 is one of the four large tokamaks aiming at the break-even plasma condition. Construction was started in April 1978 and finished in March 1985. The structure is not only large and complex but is also subjected to huge electromagnetic forces, heat load, etc. These conditions were compensated by the supporting method, the selection of material, the accuracy of fabrication, etc. In the fabrication, inspections of many kinds were carried out to guarantee the quality. After installation at the site performance tests at full power etc. confirmed the soundness of the JT-60 machine.

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