摘要
在一定的等离子体密度分布下，从电子和离子能量输运方程出发，研究了氘氚燃烧下的等离子体温度分布．研究中采用了ＪＥＴ 适用的Ｂｏｈｍ 模式下的热传导系数，考虑了α粒子的反常扩散效应，动态反馈加热．研究结果表明，Ｂｏｈｍ 模式下的热传导率从等离子体中心到边缘逐渐增加；为了维持氘氚燃烧，必须有动态反馈加热，否则，燃烧将熄灭；α粒子的反常扩散，使得加热效率因子ηα在中心区域小于１ ，在外层大于１ ；α粒子的反常扩散越强烈，中心离子温度越高，是由于中心区域的热传导小，电子温度低，反馈加热功率增加的结果；Ｂｏｈｎ 模式下的功率放大因子Ｑ 较小，因而适用Ｂｏｈｍ
By adopting the Bohm type thermal diffusivity coefficient which is applicable to JET,considering the effect of the α particle anomalous diffusion and the dynamic feedback heating,and using the energy transport equations of electron and ion,the plasma temperature profiles of deuterium\|tritium (D\|T) burning are studied under a given plasma density profile.Some results are obtained:the Bohm type thermal conductivity increases from the center of plasma to the boundary;in order to sustain D\|T burning,the dynamic feedback heating power must be present,otherwise,the burning would be extinguished;the power coupling coefficient of α particle with the bulk plasma is less than one in the central part of the plasma,and much larger than one in the outer part;the stronger the α particle anomalous duffusion,the higher the central ion temperature.This is due to the smaller thermal diffusivity coefficient in the central part and the dynamic heating power to increase because of the lower central electron temperature;the energy amplifier factor Q under the Bohm type is smaller than under other types,therefore,the prospect of the Tokamak reactor operation model based on Bohm type is pessimistic.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第12期2266-2274,共9页
Acta Physica Sinica
基金
国家自然科学基金
