Recent progress of fuel layering study for FIREX cryogenic target A. Iwamoto, T. Fujimura, M. Nakai, T. Norimatsu, H. Shiraga, H. Azechi, Y. Fujimoto, S. Machi and H. Sakagami EPJ Web of Conferences, 59 (2013) 12002 Published online: 15 November 2013 DOI: 10.1051/epjconf/20135912002