托卡马克氘氚聚变堆中氚的二倍频ICRF加热物理分析

本文从准线性理论出发，导出了ＩＣＲＦ二倍频加热时对磁面平均的吸收功率密度的近似解析表达式，并指出了这一近似的适用范围。采用冷等离子体近似计算波的色散关系，利用ＥＰＰＡＣ程序求解二维时间相关Ｆｏｋｋｅｒ－Ｐｌａｎｃｋ方程，分析了氚的二倍频加热。对于典型的氘氚聚变反应堆参数，计算了等离子体各组分温度随时间的变化及氚的分布函数随时间的演化，并分析了氚的非麦氏分布及相关的氘氚聚变反应率。结果表明，对于反应堆规模的等离子体来说，ＩＣＲＦ加热只在温度不太高时才导致明显的非麦氏分布及氘氚聚变反应率提高；在等离子体温度提高到约１０ｋｅＶ后，反应率不再有明显的提高

ANALYSIS OF ICRF SECOND HARMONIC HEATING OF TRITIUM IN A D T FUSION REACTOR

From the quasi linear theory, an approximate analytical expression is deduced to evaluate the average absorbed power density of ICRF second harmonic heating, and the conditions valid for this approximation are presented. To analyze the second harmonic heating of tritium of tritium, the cold plasma approximation is adopted to calculate the dispersion relations, and the code FPPAC is used to solve the two dimensional time dependent Fokker Planck equition. For a typical D T fusion reactor, the time dependent evolution of core plasma temperature, the distribution function of tritium and the reactivity enhancement have been calculated. It is shown that the ICRF heating will induce significant non Maxwellian ion distrbution and hence the reactivity enhancement only when the core plasma temperature is not too high, and that there will be no significant reactivity enhancement when the temperature is raised above 10keV.