Abstract
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.
