Affiliation: | 1. Institute for Laser Science, The University of Electro-Communications, Tokyo, Japan;2. Department of Helical Plasma Research, National Institute for Fusion Science, Gifu, Japan;3. Department of Helical Plasma Research, National Institute for Fusion Science, Gifu, Japan Department of Advanced Energy Engineering Science, Kyushu University, Fukuoka, Japan;4. National Astronomical Observatory of Japan, Tokyo, Japan Department of Astronomical Science, The Graduate University for Advanced Studies, SOKENDAI, Tokyo, Japan |