Abstract
JT-60 will have a molybdenum first wall with a temperature of ~400–500°C, axisymmetric metal and magnetic limiters. Molybdenum has advantageous properties, i.e. low sputtering yield and high melting point. Furthermore, at temperatures of about 450–500°C, the hydrogen recycling ratio will become unity mainly by thermal desorption. Surface carbon and oxygen can be reduced by chemical reaction with oxygen and hydrogen gases, and surface damage such as blistering and grain ejection can be avoided. An axisymmetric limiter is useful to reduce the heat load per unit area, and a magnetic limiter will prevent the recycling of metallic impurities. An in-situ coating of molybdenum to attain a good clean surface, and a honeycomb liner to reduce the flux of sputtered wall atoms are now under development.
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