[Table of Contents]

Plasma and Fusion Research

Volume 5, S2057 (2010)

Regular Articles

Numerical Diagnostics of the Electrostatic Potential Perturbed by Magnetic Islands
Seiya NISHIMURA, Naohiro KASUYA, Masatoshi YAGI1,2), Kimitaka ITOH, Sanae-I. ITOH1) and Nobuyoshi OHYABU
National Institute for Fusion Science, Gifu 509-5292, Japan
Research Institute for Applied Machanics, Kyushu University, Fukuoka 816-8580, Japan
Japan Atomic Energy Agency, Ibaraki 311-0193, Japan
(Received 7 December 2009 / Accepted 11 March 2010 / Published 10 December 2010)


Nonlinear dynamics of a magnetic island is simulated using a set of reduced two-fluid equations, and the excitation of the electric field in the vicinity of the magnetic island is observed. An impact of the error field (external symmetry-breaking magnetic perturbation) on the electric field is examined, and its global structure changes with a small error field. A numerical measurement simulating the heavy ion beam probe is carried out on the field given by the nonlinear simulation. An effect of the finite width of the injected beam is taken into account, and the spatial resolution is evaluated. It is found that the measuring error due to the finite beam width is significant when the radial gradient scale length of the electrostatic potential is comparable to the beam width.


magnetic island, electrostatic potential, numerical diagnostics, heavy ion beam probe, error field

DOI: 10.1585/pfr.5.S2057


  • [1] F. L. Waelbroeck, Nucl. Fusion 49, 104025 (2009).
  • [2] K. Ida et al, Phys. Rev. Lett. 11, 015002 (2002).
  • [3] Bruce D. Scott, A. B. Hassam and J. F. Drake, Phys. Fluids 28, 275 (1985).
  • [4] M. Ottaviani, F. Porcelli and D. Grasso, Phys. Rev. Lett. 13, 075001 (2004).
  • [5] S. Nishimura, S. Benkadda, M. Yagi, S.-I. Itoh and K. Itoh, Phys. Plasmas 15, 092506 (2008).
  • [6] N. Kasuya, M. Yagi, S.-I. Itoh and K. Itoh, Phys. Plasmas 15, 052302 (2008).
  • [7] T. Yamada, S.-I. Itoh, T. Maruta, N. Kasuya, Y. Nagashima, S. Shinohara, K. Terasaka, M. Yagi, S. Inagaki, Y. Kawai, A. Fujisawa and K. Itoh, Nature Phys. 4, 721 (2008).
  • [8] S. Nishimura, M. Yagi, S.-I. Itoh and K. Itoh, J. Phys. Soc. Jpn. 77, 014501 (2008).
  • [9] S. Nishimura, M. Yagi, K. Itoh, S.-I. Itoh and S. Benkadda, ‘Locking of magnetic island rotation by static error field', Nucl. Fusion (in press).
  • [10] T. Ido et al, Plasma Science and Technology 11, 460 (2009).

This paper may be cited as follows:

Seiya NISHIMURA, Naohiro KASUYA, Masatoshi YAGI, Kimitaka ITOH, Sanae-I. ITOH and Nobuyoshi OHYABU, Plasma Fusion Res. 5, S2057 (2010).