NON-DIMENSIONAL TRANSPORT SCALING AND ITS CORRELATION WITH LOCAL TRANSPORT PROPERTIES IN JT-60U PLASMAS

摘要

A scaling law for the stored thermal energy has been established for ohmically heated and NBI heated L mode plasmas in JT-60U and JT-60. Both global and local transport studies clearly show that the one-fluid thermal diffusivity has a p*~(0.5) dependence located between Bohm type and gyro-Bohm type scalings. The improvement in the energy confinement in the hot ion H mode and high β_p H mode plasmas results from the reduction of χ_i in the central plasma region. A two step heat transport reduction occurs during NBI heating in highβ_p H mode plasmas. The first and the second steps result from the improvement in the plasma central region and in the plasma outer region, respectively.