[Table of Contents]

Plasma and Fusion Research

Volume 1, 014 (2006)

Rapid Communications

Development of a Two-Dimensional Thomson Scattering Diagnostic System involving Use of Multiple Reflection and the Time-of-Flight of Laser Light
Takashi SUMIKAWA, Kouhei YAMASHITA, Manabu ONODA, Tokihiko TOKUZAWA1), Eiichirou KAWAMORI2) and Yasushi ONO
Graduate School of Frontier Science, the University of Tokyo
National Institute for Fusion Science
High Temperature Plasma Center, the University of Tokyo
(Received 26 December 2005 / Accepted 1 February 2006 / Published 15 March 2006)


Two-Dimensional Thomson Scattering Measurement (2-D TS) was designed using multiple reflections and the time-of-flight of laser light. This new approach enable us to measure the r(radial)-z(axial) profiles of electron temperature and density. In this approach, (1) multiple reflections of YAG laser light are used to cover the whole r-z plane of the ST (Spherical Tokamak) plasma, and (2) the time delay of the scattered light along the laser beam is arbitrarily arranged by adjusting the multiply reflected laser light path in order to reduce the necessary number of detectors. Rayleigh scattering lights were observed successfully at two measurement points, suggesting that the basic principle of the 2-D Thomson scattering system functions effectively as a new extension of LIDAR (LIght Detection And Ranging) Thomson scattering system.


Thomson scattering, Rayleigh scattering, time-of-flight

DOI: 10.1585/pfr.1.014


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This paper may be cited as follows:

Takashi SUMIKAWA, Kouhei YAMASHITA, Manabu ONODA, Tokihiko TOKUZAWA, Eiichirou KAWAMORI and Yasushi ONO, Plasma Fusion Res. 1, 014 (2006).