Nam Y U, Chung J
National Fusion Research Institute, Gwahangno 113, Daejeon 305-333, South Korea.
Rev Sci Instrum. 2010 Oct;81(10):10D510. doi: 10.1063/1.3475326.
A 280 GHz single-channel horizontal millimeter-wave interferometer system has been installed for plasma electron density measurements on the Korea Superconducting Tokamak Advanced Research (KSTAR) device. This system has a triangular beam path that does not pass through the plasma axis due to geometrical constraints in the superconducting tokamak. The term line density on KSTAR has a different meaning from the line density of other tokamaks. To estimate the peak density and the mean density from the measured line density, information on the position of the plasma is needed. The information has been calculated from tangentially viewed visible images using the toroidal symmetry of the plasma. Interface definition language routines have been developed for this purpose. The calculated plasma position data correspond well to calculation results from magnetic analysis. With the position data and an estimated plasma profile, the peak density and the mean density have been obtained from the line density. From these results, changes of plasma density themselves can be separated from effects of the plasma movements, so they can give valuable information on the plasma status.
已安装了一个280吉赫兹单通道水平毫米波干涉仪系统，用于在韩国超导托卡马克先进研究装置（KSTAR）上测量等离子体电子密度。由于超导托卡马克的几何限制，该系统具有不穿过等离子体轴的三角形光路。KSTAR上的线密度术语与其他托卡马克的线密度含义不同。为了从测量的线密度估计峰值密度和平均密度，需要等离子体位置的信息。该信息是利用等离子体的环形对称性从切向观察的可见图像计算得出的。为此开发了接口定义语言例程。计算出的等离子体位置数据与磁分析的计算结果吻合良好。利用位置数据和估计的等离子体剖面，从线密度中获得了峰值密度和平均密度。根据这些结果，可以将等离子体密度本身的变化与等离子体运动的影响区分开来，因此它们可以提供有关等离子体状态的有价值信息。
