PRELIMINARY DESIGN STUDY OF THE TARGET AND LITHIUM CIRCULATION SYSTEM FOR ESNIT

The preliminary design study of the target and lithium (Li) circulation system for ESNIT (Energy Selective Neutron Irradiation Test Facility) has been made, based on the Fusion Material Irradiation Test Facility (FMIT) design. It is important to estimate the difference between the Li temperature and its boiling point (boiling margin) as a function of Li flow rate and deuteron beam energy. A one dimensional finite element method has been used to analyze the boiling margin considering the parameters of beam energy, Li velocity, thickness of the Li flow stream and curvature of back wall of target container. For the Li circulation system, technological evaluations of the main Li circulation system and the Li purification system have been carried out. For all the impurity elements, including deuteron (D)-Li reaction products such as beryllium (Be) and tritium (T), a sufficient low impurity level of about 10 ppm can be achieved by operating a cold trap, absorber and hot trap as the purification system.