托卡马克等离子体辐射诊断中的线积分辐射率

在托卡马克等离子体辐射诊断中，通过阿贝尔反汪或层析分析从线积分辐射率中得到的空间分布，是辐射率在束线宽度范围内的平均值的分布，束线宽度限制了诊断的空间分辨能力。当探测器无穷小的近似条件不成立时。束线宽度显著大于探测器中心对光栏孔径张角决定的宽度，并且在给定束线截面内各点辐射对探测信号的贡献差别可能变得重要从而导致辐射率的宽度平均成为带权重的平均。

LINE INTEGRATED EMISSIVITY IN TOKAMAK PLASMA RADIATION DIAGNOSTICS

In tokamak plasma radiation diagnostics,an emissivity profile derived from line integrated radiation measurement data with Abel inversion or tomographic analysis is averaged over a poloidal cross section of the plasma chord.The width of this cross section restricts the spatial resolution of the given diagnostic system.In the cases where the condition for infinitesimal detector approximation is not satisfied,this width appears to be markedly greater than that defined by the angle viewed from the detector center to the poloidal dimension of an aperture,and the contributions to the detected signal from different points on the given cross section of the plasma chord are not the same,so the average of the emissivity over the cross section is a weighted one.In fact,many radiation diagnostic systems on tokamaks do not satisfy the infinitesimal detector approximation condition.On the basis of the derived explicit formula for the line integrated emissivity,the relevant questions are discussed in detail.