Photon Temperatures of Hard X-Ray Emission of LHCD Plasmas nd Current Drive Efficiency in the HT-7 Tokamak

摘要

A comprehensive study of photon temperatures (Tph) of hard X-ray emission in the lower hybrid current drive (LHCD) plasmas and the current drive efficiency of lower hybrid waves in HT-7 tokomak is presented through a simple correlation. The photon temperature increases with increasing plasma current while it decreases with increasing plasma density. The current drive efficiency increases with the increase of the density in fully accessible condition of LHCD, with the decreased photon temperature Tph and increased population density of the fast electrons at fixed plasma current. These experimental results reveal that photon temperature depends mainly on global effects of the fast electron population, synergy between the fast electron and the loop voltage and the coulomb slowing down