Motojima, G., Masuzaki, S., Dhard, C. P., Krause, M., Naujoks, D., Hayashi, Y., et al. (2019). Optical reflection coeffcient measurements for the identification of deposition layer in LHD and W7-X. Talk presented at 9th International Workshop on "Stochasticity in Fusion Plasmas (SFP)" – 3D Physics in Stellarators and Tokamaks. Bad Honnef. 2019-04-08 - 2019-04-10.