THOMSON SCATTERING MEASUREMENTS ON OHMICALLY HEATED PLASMAS IN THE JFT-2 TOKAMAK

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≪KeEXPlesssimKeDTE, where KeNC and KeDTE are the neoclassical and dissipative-trapped electron thermal conductivities respectively. © 1979 The Japan Society of Applied Physics.