Analysis of plasma material surfaces by means of low energy NRA

Precise investigation for the depth-profiles of the main-isotope on the plasma facing material (PFM) surface is necessary to clarify the mechanism for the fusion fuel recycling in the D-T fusion reactor. For the determination, nuclear reaction analysis (NRA) is valuable to obtain these concentrations and depth-profiles. We have carried out the depth profile analysis of the depth profile of the deuterium, tritium and lithium-isotope and the surface of the JT-60 and TFTR carbon fiber composites (CFC) tile by means of NRA with the JAERI fusion neutronics source (FNS) accelerator. In this paper, we describe the present status of the NRA activity in the JAERI/FNS and especially report the preliminary results of the deuterium and tritium depth profiles for the TFTR tiles. (author)