Part II. R & D efforts for the R-tokamak components

Abstract In parallel to the conceptual design of the R-tokamak, research and development efforts on the systems and the components have been carried out to obtain scopes to realize the device. Because we intended to introduce DT fuels into the device, the items of research and development works are quite different to that of non-burning machines. Alminium alloy developments to avoid activations by 14 MeV neutron irradiations, tritium safe handling and vacuum system with tritium are examples of this category. Beside specific requirement directly caused by DT introduction, highly reliable operation of the machine is strongly requested, because it is the necessary condition to perform experiments safely. However, these efforts are still in an early stage of investigation and many efforts are needed to prepare a rigid data base tokamak operation with reacting plasma.