Abstract:

In tokamak plasma radiation diagnostics ,a relationship between the line-integrated emissivity and the plasma emissivity distribution in the infinitesimal-detector approximation is usually used. It can be shown that this approximation holds only for the detection system with the detector which has a poloidal size much smaller than that of the aperture. For the system with equal-size of detector and aperture, the cross-section of detector chord in plasma is twice as large as that in the infinitesimal-detector approximation. For such system the correction at finite detector size is derived for the line-integrated emissivity expression. The improvement by the correction on tomography analysis is discussed in brief.

Key words: Tokamak plasma , Line-integrated emisivity, Tomography analysis

摘要：

在托卡马克等离子体辐射的诊断中 ,线积分辐射率与辐射发射率之间的关系 ,常采用探测器无穷小近似下的表达式。简单分析表明 ,只有在探测器极向尺寸远小于光栏极向尺寸时 ,这种近似才成立。在探测器与光栏的极向尺寸相同的情况下 ,束线宽度约为探测器无穷小近似下的宽度的两倍。对这种探测系统的线积分辐射率作了有限探测器效应修正 ,并简要讨论了它对层析分析的影响。

关键词: 托卡马克等离子体 , 线积分辐射率 , 层析分析