氢中性束在等离子体中透射情况的分析与计算

ANALYSIS AND CALCULATION OF H0 NEUTRAL BEAMATTENUATION DURING PENETRATION INTO PLASMA

阐述了中性束加热等离子体的物理过程，并利用基于不同物理模型（考虑和未考虑束－等离子体碰撞多级过程）的两种计算方法，对中性束在等离子体中的透射衰减情况进行了计算、分析和比较，给出了束在等离子体中的衰减与束能量、等离子体参数及杂质情况的关系及在ＨＬ－１Ｍ等离子体典型参数下的计算结果。两种计算结果都表明，中性束在等离子体中的穿透系数均随中性束能量Ｅ０的提高而增大，随等离子体密度ｎｅ的增高而减少，并表明在ｎｅ≤１０１４ｃｍ－３，２０≤Ｅ０／ｋｅＶｕ－１≤１００区域内，利用简化物理模型的分析计算与考虑多级过程的数值计算相比，等离子体对中性束的有效阻止截面的相对误差≤２０％。

おhysical processes of neutral beam heating plasma are described in the present paper.Attenuation of the neutral beam penetrating into the plasma has been calculated,analysed and compared by means of two kinds of calculation methods based on different physical models.The dependence of neutral beam decay in the plasma on the beam energy,plasma parameters and impurity has been investigated.Calculation results of the beam attenuation have been given for the HL1M plasma with typical parameters.Both calculation results show that the penetration coefficient of the neutral beam entering the plasma increases with the neutral beam energy E0,and decreases with the plasma density ne ,and show that comparing the analytical calculation using simplified physical model with numerical calculation taking multistep processes into account in the range of ne≤1014cm-3 and 20≤E0/keV·u-1≤100,the effective stopping crosssection of the former is ≤20% less than that of the latter.