Surface modifications of RAFM steels by deuterium exposure: Variation from coral-like/fuzz-like to blister-like features

a Max-Planck-Institut fur Plasmaphysik, EURATOM Association, Garching, Germany Hydrogen Isotope Research Center, University of Toyama, Toyama, Japan c Tritium Technology Group, Japan Atomic Energy Agency, Rokkasho, Japan d Tritium Technology Group, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki, 319-1195, Japan e Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan f Dutch Institute for Fundamental Research, Nieuwegein , The Netherlands g Warsaw University of Technology, Faculty of Material Science and Engineering, Woloska 141, 02-507, Poland h Center for Energy Research, University of California at San Diego, La Jolla, CA 92093-0417, USA