Abstract: A single-channel far-infrared (FIR) laser interferometer is developed for measuring the line averaged electron density (R=1.82m) of the main plasma on EAST tokamak. While main plasma density is raised by gas puffing, three different divertor regimes, i.e., low recycling (low divertor plasma density, high temperature), high recycling (high divertor plasma density, low temperature), and detached divertor plasma (low divertor plasma density, low temperature), are first obtained on EAST tokamak. The physical phenomena of these regimes on EAST tokamak are presented briefly.

Key words: FIR laser interferometer, Electron density, Divertor

摘要： 利用EAST装置单道远红外HCN激光干涉仪测量了等离子体中心道(R=1.82m)线平均电子密度。通过充气加料连续提升主等离子体密度，首次在EAST装置上观察到偏滤器等离子体的三种不同状态：低再循环(偏滤器靶板处等离子体温度较高，密度较低)，高再循环(偏滤器靶板处等离子体温度较低，密度较高)和脱靶(偏滤器靶板处等离子体温度和密度都很低)等离子体状态。分析了EAST偏滤器在这三种不同状态下的物理现象。

关键词: 远红外激光干涉仪, 电子密度, 偏滤器