Photon Temperatures of Hard X-Ray Emission of LHCD Plasmas in HT-7 Tokamak

摘要

A detailed study of photon temperatures(T_(ph))of hard X-ray emission in lowerhybrid current drive(LHCD)plasmas is presented.The photon temperature increases with theincrease in plasma current and decreases with the increase in plasma density.In lower hybridpower and phase scanning experiments;there is no appreciable change in the photon temperature.The numerical results based on ray-tracing calculation and Fokker-Planck solver gives reasonableexplanation for the experimental observation.Both experimental and numerical results reveal thatthe photon temperature depends mainly on global effects of the fast electron population,synergybetween the fast electron and the loop voltage and the Coulomb slowing down.