Synthesis of reflection gratings for advanced plasma heating scenarios B. Plaum, M. Schubert, A. Zeitler, W. Kasparek, C. Lechte, J. Stober and ASDEX Upgrade Team EPJ Web Conf., 187 (2018) 01015 Published online: 03 September 2018 DOI: 10.1051/epjconf/201818701015