@article{oai:nifs-repository.repo.nii.ac.jp:00005026, author = {Ikeda, K. and NBI, Group and Fantz, U.}, journal = {Annual Report of National Institute for Fusion Science}, month = {2016-03-15}, title = {Optical Emission Spectroscopy in Large Negative Ion Source for LHD-NBI}, volume = {Annual Report Apr.2006-Mar.2007}, year = {} }