Mr Jaydeepkumar Joshi (ITER-India (Institute for Plasma Research))
For the ITER neutral beam (NB) system, a measure to achieve the 1 MV vacuum insulation of the beam source have been developed. For this purpose, design basis for 1 MV vacuum insulation has been developed by integrating previous empirical scaling for plane and coaxial electrodes and new scaling for area with locally-concentrated electric field. Consequently, as the measure, the beam source is surrounded by more than three intermediate electrostatic shields instead of single gap to sustain 1 MV. Effectiveness of the shields designed by the design basis was experimentally verified by using a part of the beam source. The voltage holding capability has been significantly improved from 0.7 MV to 1 MV. This result ensures the 1 MV vacuum insulated beam source in the ITER NB system.
|Country or International Organization||Japan|
Mr Atsushi Kojima (National Institutes for Quantum and Radiological Science and Technology)
Mr Grisham Larry (PPPL) Mr Haruhiko Yamanaka (QST) Dr Hiroyuki Tobari (QST) Dr JUNICHI HIRATSUKA (National Institutes for Quantum and Radiological Science and Technology) Mr Kazuhiro Watanabe (QST) Mr Masahiro Ichikawa (QST) Mr Masayuki Dairaku (QST) Ms Mieko Kashiwagi (QST) Mr Naoki Shibata (QST) Mr Naotaka Umeda (National Institutes for Quantum and Radiological Science and Technology) Mr Yasuo Yamashita (QST) Mr Yasushi Yamano (Saitama University)