Assessment of ECH stray radiation levels at the W7-X Michelson Interferometer and Profile Reflectometer Johan. W. Oosterbeek, Neha Chaudhary, Matthias Hirsch, Udo Höfel, Robert. C. Wolf and W7-X team EPJ Web Conf., 203 (2019) 03010 Published online: 25 March 2019 DOI: 10.1051/epjconf/201920303010