ELECTRON-TEMPERATURE, DENSITY AND PRESSURE-GRADIENTS AT THE EDGE IN H-MODE JFT-2M PLASMA

The full electron temperature (T-e) and density (n(e)) profiles in the H-mode plasmas are measured precisely with a TV Thomson scattering sy stem. The temperature gradient at the edge in the H-mode is 5-6 times higher than that of the L-mode phase. The electron temperature scale l ength (L-Te) is equal to the density scale length (L-ne) at the beginn ing of the H-mode phase, and L-Te(-1) is larger than L-ne(-1) in the H -mode phase, which is contrary to that of the ohmic heating. L-Te and L-ne of the ELMy H-mode are longer than that of the ELM-free n-mode. ( C) 1998 Elsevier Science B.V.