@inproceedings{oai:repo.qst.go.jp:00054747,
 author = {梅田, 尚孝 and 柏木, 美恵子 and 戸張, 博之 and 小島, 有志 and 大楽, 正幸 and 花田, 磨砂也 and 前島, 哲也 and 渡邊, 和弘 and 山中, 晴彦 and 梅田 尚孝 and 柏木 美恵子 and 戸張 博之 and 小島 有志 and 大楽 正幸 and 花田 磨砂也 and 前島 哲也 and 渡邊 和弘 and 山中 晴彦},
 book = {Proceeding 26th IAEA FEC},
 month = {Mar},
 note = {Dc ultra-high voltage insulation technologies in oil, gas and vacuum have been developed. Based on these technologies, fabrication of dc 1 MV power supply components for the neutral beam (NB) system on ITER has progressed. For DC generators which insulate dc 1 MV for long pulse duration up to 3600 s, oil immersed pressboard with multi-layer structure has been improved to suppress flashover. For 1 MV transmission lines, the R&D results of gas insulations have been applied to realize the compact transmission line containing several high voltage feeders. For a HV bushing which has five stage gaps in vacuum, voltage holding capability in the multistage gaps has been found to be characterized by a total cathode area. Based on these insulation technologies, manufacturing of these components have been completed. As for DC generator and transmission line, voltage holding of 1.2 MV was successfully demonstrated. As for the HV bushing, 240 kV voltage　holding for each stage has achieved. These results fulfil the ITER requirements. After that, the installation work of these components has been started in the NB test facility since December 2015.},
 title = {Development of ultra-high voltage insulation technology for the power supply components in neutral beam system on ITER},
 year = {2017}
}