At the Garching 14 MV Tandem accelerator lab (Maier-Leibnitz-Laboratory MLL run by the TU Munich and the LMU Munich) the microprobe SNAKE (run by the Universität der Bundeswehr Munich) is a unique facility to quantitatively analyze H distributions in three dimensions with micrometer resolution. A coincidence detection system is installed to analyze proton-proton scattering events with up to 25 MeV incident protons. The high energy offers the possibility to analyze material up to a thickness of e.g. 50 μm W or 200 μm for C. Sub-ppm sensitivity has been achieved for light materials like diamond, worse sensitivity of few ppm is demonstrated in heavy metals like Fe or W. Studies of H retention in irradiated tungsten as well as steel from fission reactors have been performed to image and quantify the hydrogen distribution in irradiation induced defect structures like cracks and blisters. Improvement of the coincidence filters and detector parameters is required to study the hydrogen retention on grain boundaries in metals. D detection with ppm sensitivity is also available by using a deuteron beam and detect deuterondeuteron coincidences or using the (p; d) elastic scattering reaction. This gives the possibility to study adsorption, retention as well as diffusion processes of D in fusion reactor wall material. By detecting the elastic scattering signal of the backscattered protons elements heavier than hydrogen can be quantified. The signals from the individual isotopes might be well separated due to the high incident energy. This offers the possibility to clearly identify these signals and map the other elements with spatially correlation to the hydrogen isotopes. This might give further valuable information to the defect analysis for plasma facing wall material.    «

At the Garching 14 MV Tandem accelerator lab (Maier-Leibnitz-Laboratory MLL run by the TU Munich and the LMU Munich) the microprobe SNAKE (run by the Universität der Bundeswehr Munich) is a unique facility to quantitatively analyze H distributions in three dimensions with micrometer resolution. A coincidence detection system is installed to analyze proton-proton scattering events with up to 25 MeV incident protons. The high energy offers the possibility to analyze material up to a thickness of e...    »