22 A beam production of the uniform negative ions in the JT-60 negative ion source

Masafumi Yoshida, Masaya Hanada, Atsushi Kojima, Mieko Kashiwagi, Larry R. Grisham, Akiyoshi Hatayama, Takanori Shibata, Takashi Yamamoto, Noboru Akino, Yasuei Endo, Masao Komata, Kazuhiko Mogaki, Shuji Nemoto, Masahiro Ohzeki, Norikazu Seki, Shunichi Sasaki, Tatsuo Shimizu, Yuto Terunuma

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In order to improve the spatial uniformity of the negative ion beam and to produce high current negative ion beams in a large negative ion source, a magnetic field configuration is modified from an original transverse filter to a tent-shaped filter, in combination with reducing the magnetic field strength in the JT-60 negative ion source. As a result, the beam uniformity is improved from 68% to 83% over an area of the whole extraction area of 450 × 1100 mm<sup>2</sup>. The improvement of the beam uniformity leads to the production of 32 A H<sup>-</sup> ion beams with the whole extraction area. The obtained beam current fulfills the requirement for JT-60SA.

Original languageEnglish
Pages (from-to)616-619
Number of pages4
JournalFusion Engineering and Design
Volume96-97
DOIs
Publication statusPublished - 2015 Oct 1

Keywords

  • JT-60SA
  • Magnetic filter
  • NBI
  • Negative ion beams

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Civil and Structural Engineering
  • Mechanical Engineering

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    Yoshida, M., Hanada, M., Kojima, A., Kashiwagi, M., Grisham, L. R., Hatayama, A., Shibata, T., Yamamoto, T., Akino, N., Endo, Y., Komata, M., Mogaki, K., Nemoto, S., Ohzeki, M., Seki, N., Sasaki, S., Shimizu, T., & Terunuma, Y. (2015). 22 A beam production of the uniform negative ions in the JT-60 negative ion source. Fusion Engineering and Design, 96-97, 616-619. https://doi.org/10.1016/j.fusengdes.2015.06.152