Direct Measurements of the Electron Energy Flux versus Electron Temperature Gradient in Tokamak Discharges

作     者：K.W.Gentle M.E.Austin P.E.Phillips 

作者机构：Fusion Research Center University of Texas USAFusion Research Center University of Texas USAFusion Research Center University of Texas USA 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2004年第6卷第1期

页      面：2130-2134页

核心收录：

学科分类：07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：the US Department of Energy under grant DE-FG03-97-ER54415 

主　　题：tokamak discharges electron energy flux electron temperature gradient direct measurements 

摘      要：Electron thermal transport is one of the most complex processes in fusionplasmas. It is generally described by a simple thermal diffusivity in transport analyses ofdischarges, but there is evidence of critical gradient effects with moderate stiffness. By analyzingperiodic perturbations to an equilibrium, one canmeasure the variations in electron energy flux andelectron temperature gradient over the perturbation cycle, obtaining the flux as a function ofgradient over the range of parameters generated by the perturbation. Although time-dependenttransport analysis is very sensitive to noise in the input data, averaging over many cycles of aperiodic perturbation can provide data of sufficient quality. The analyses presented here are basedon the ECE temperature data with high spatial and temporal resolution and full profile coverage onDIII-D for sawteeth and modulated ECH heating.