Locking of magnetic island rotation by static error field

S. Nishimura, M. Yagi, K. Itoh, Sanae Itoh, S. Benkadda

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The drift-tearing mode is nonlinearly simulated, using a reduced set of two-fluid equations and locking of magnetic island rotation by a static error field is investigated. Detailed analysis shows that Maxwell stress and ion viscosity play important roles in the locking process. In the locked state, it is found that contributions of E × B flow and electron diamagnetic flow cancel each other inside a magnetic island. A low dimensional model describing the locking process of a rotating magnetic island is derived, based on nonlinear simulation results. It is clarified that a coupling between trapping by an error field and damping by ion viscosity is essential. The dynamics of a rotating magnetic island is shown to be understood by analogy with the damping process of pendulum motion in a gravity field.

Original languageEnglish
Article number054007
JournalNuclear Fusion
Volume50
Issue number5
DOIs
Publication statusPublished - Apr 30 2010

Fingerprint

magnetic islands
locking
damping
viscosity
pendulums
ions
trapping
gravitation
fluids
electrons
simulation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Nishimura, S., Yagi, M., Itoh, K., Itoh, S., & Benkadda, S. (2010). Locking of magnetic island rotation by static error field. Nuclear Fusion, 50(5), [054007]. https://doi.org/10.1088/0029-5515/50/5/054007

Locking of magnetic island rotation by static error field. / Nishimura, S.; Yagi, M.; Itoh, K.; Itoh, Sanae; Benkadda, S.

In: Nuclear Fusion, Vol. 50, No. 5, 054007, 30.04.2010.

Research output: Contribution to journalArticle

Nishimura, S, Yagi, M, Itoh, K, Itoh, S & Benkadda, S 2010, 'Locking of magnetic island rotation by static error field', Nuclear Fusion, vol. 50, no. 5, 054007. https://doi.org/10.1088/0029-5515/50/5/054007
Nishimura S, Yagi M, Itoh K, Itoh S, Benkadda S. Locking of magnetic island rotation by static error field. Nuclear Fusion. 2010 Apr 30;50(5). 054007. https://doi.org/10.1088/0029-5515/50/5/054007
Nishimura, S. ; Yagi, M. ; Itoh, K. ; Itoh, Sanae ; Benkadda, S. / Locking of magnetic island rotation by static error field. In: Nuclear Fusion. 2010 ; Vol. 50, No. 5.
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