European DEMO divertor target: Operational requirements and material-design interface oleh J.H. You, E. Visca, Ch. Bachmann, T. Barrett, F. Crescenzi, M. Fursdon, H. Greuner, D. Guilhem, P. Languille, M. Li, S. McIntosh, A.V. Müller, J. Reiser, M. Richou, M. Rieth