中性束注入产生的非麦氏分布对D－T聚变反应率的影响

D T FUSION REACTIVITY VARIATION INDUCED BY NBI PRODUCED NON MAXWELLIAN DISTRIBUTION

通过求解二维含时非线性ＦｏｋｋｅｒＰｌａｎｃｋ方程，计算反应堆规模下氚的ＮＢＩ（平行注入）加热时等离子体各组分分布函数及反应率随时间的演化，讨论非麦氏分布对反应率的影响．结果表明：分析非麦氏分布对反应率的影响时，定义Ｔｅｆ＝２３∫１２ｍｖ２ｆ（ｖ）ｄｖ，η＝〈σｖ〉Ｎ〈σｖ〉Ｍ（ＴＤ，ＴｅｆＴ）是比较方便而恰当的．加热初期，η从１增加到最大值，然后逐渐下降．加热功率较大或者束能较高都会使η下降得小于１．当η下降到１时，Ｔ∥Ｔ升至约１０ｋｅＶ．

By numerically solving the tow dimensional time dependent non linear Fokker Planck equations, the distribution functions are calculated and the D T fusion reactivity are evaluated. For the tritium parallel injection case, the reactivity variation induced by the non Maxwellian distribution is analyzed. It is pointed out that it is appropriate to define T eff = 23∫12 mv 2f (v)dv,η=〈σv〉 N〈σv〉 M(T D,T eff T). The calculation results show that η increases from 1 to maximum and then decreases during NBI heating. Either high input power or high beam energy can make η to decrease to a value less than 1 When η decreases to 1, T ∥ T is raised to about 10keV.