The light scattering spectrum from a high temperature plasma is calculated for the second order in v/c (c=light speed) and the second order approximate formula is obtained from the calculation. The blue side shift of the peak derived from the second order approximate formula agrees well with that of the full relativistic spectrum for an electron temperature of several tens of kilo electron-volts and less. The second order apparent temperature and density are deduced with an accuracy of better than 8 percent in the range up to 20 keV and 100 keV for scattering angles θ=90° and 50°, respectively, by application of the least-square procedure.

Measurements were made on electron temperature and density profiles of ohmically heated hydrogen plasmas in the JFT-2 tokamak device by using Thomson scattering of light from a Q-switched ruby laser. The measured electton temperature ranged from 0.08 keV to 1.2 keV for electton densities of 2.0×1012 cm-3 to 4.4×1013 cm-3. The temperature profile was found to have a rather sharp distribution in the central region. The electron temperature was found to vary linearly with the plasma current and the ionic charge derived from the electron temperature and plasma conductivity decreased with the electron density. The experimental electron thermal conductivity KeEXP in the central region was compared with the theoretical prediction KeNC≪KeEXP\lesssimKeDTE, where KeNC and KeDTE are the neoclassical and dissipative-trapped electron thermal conductivities respectively.

No abstract