[Table of Contents]

Plasma and Fusion Research

Volume 1, 013 (2006)

Rapid Communications

Two-Dimensional Measurement of Electron Density Profile in the Edge Region of the Large Helical Device Plasma by a Sheet-Shaped Thermal Lithium Beam
Yoshiyuki TAKAHASHI, Tomohiro MORISAKI1), Kazuo TOI1) and LHD Experimental Group1)
Department of Energy Engineering and Science, Nagoya University
National Institute for Fusion Science
(Received 20 September 2005 / Accepted 2 February 2006 / Published 15 March 2006)


In the Large Helical Device (LHD), of which the magnetic surfaces are surrounded by an ergodic magnetic field layer, the two-dimensional prole of electron density was for the first time measured by a newly developed sheet-shaped thermal lithium beam probe. The sheet beam was formed by guiding lithium vapor through three orifices placed in front of an aperture of an oven and injecting the vapor nearly vertically into the LHD plasma. The two-dimensional (2D) image of the LiI line was measured by using a CCD camera with an interference filter for LiI (670.8 nm). From the 2D image of LiI, we successfully obtained a two-dimensional profile of electron density in the plasma edge region.


two-dimensional electron density prole, lithium beam probe, a sheet beam, edge plasma

DOI: 10.1585/pfr.1.013


  • [1] K. Toi et al., Nucl. Fusion 44, 217 (2004).
  • [2] K. Toi et al., Phys. Plasmas 12, 020701-1 (2005).
  • [3] T. Morisaki et al., J. Nucl. Mater. 313-316, 548 (2003).
  • [4] T. Morisaki et al., Rev. Sci. Instrum. 73, 1865 (2003).
  • [5] K. Kadota et al, J. Nucl. Mater. 128-129, 960 (1984).

Publisher's Note

This article was originally published with a typographical error in the date for acceptance. The article has been corrected as follows:
(Received 20 September 2005 / Accepted 2 February 2005)
->(Received 20 September 2005 / Accepted 2 February 2006).

This paper may be cited as follows:

Yoshiyuki TAKAHASHI, Tomohiro MORISAKI, Kazuo TOI and LHD Experimental Group, Plasma Fusion Res. 1, 013 (2006).

(Revised 29 May 2006)