Developments for collective Thomson scattering equipment with a sub-THz gyrotron in LHD Teruo Saito, Yoshinori Tatematsu, Yuusuke Yamaguchi, Masafumi Fukunari, Takumi Hirobe, Ryushi Shinbayashi, Shunsuke Tanaka, Kunizo Ohkubo, Shin Kubo, Takashi Shimozuma et al. (2 more) EPJ Web Conf., 203 (2019) 03012 Published online: 25 March 2019 DOI: 10.1051/epjconf/201920303012