Experiment of magnetic island formation in Large Helical Device

Y. Nagayama, K. Narihara, Y. Narushima, N. Ohyabu, T. Hayashi, K. Ida, Inagaki Shigeru, D. Kalinina, R. Kanno, A. Komori, T. Morisaki, R. Sakamoto, S. Sudo, N. Tamura, T. Tokuzawa, H. Yamada, M. Yoshinuma

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Magnetic island formation is experimentally investigated in the Large Helical Device. The (m, n) ≤ (1, 1) vacuum magnetic island is generated by using the local island diverter field, where m and n are the poloidal and toroidal mode numbers, respectively. The island width depends on plasma parameters (the electron temperature and the β) and the magnetic axis position. In the case of Rax ≤ 3.53 m the magnetic island in the plasma is larger than that in the vacuum field. Here, Rax is the major radius of the magnetic axis. In the case of Rax ≤ 3.6 m the magnetic island is not generated when the error field is less than the threshold which is increased as the β is increased. Evidence of island current is obtained when the magnetic island is formed due to a small error field. However, the mechanism that generates the island is not yet known.

Original languageEnglish
Pages (from-to)888-893
Number of pages6
JournalNuclear Fusion
Issue number8
Publication statusPublished - Aug 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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