EAST 托克马克装置上的电子回旋辐射成像系统实验研究

Electron Cyclotron Emission Imaging on the EAST Tokamak

摘要: 一个新建的电子回旋辐射成像诊断系统已经成功地在EAST全超导托克马克装置的实验中应用, 该系统的成像光路首次使用了全新设计的含非球面透镜的远场成像透镜组合, 以使系统的空间分辨能力达到最优化。系统采用16单元探测阵列和8个分频的电子回旋辐射信号成像, 可以探测EAST装置芯部截面大约20cm ? 6cm区域的等离子体电子温度及其涨落的分布与演化, 已经获得了大量有关芯部等离子体锯齿震荡相关的数据, 初步分析得到了一些锯齿震荡有关的结果。

Abstract: An upgraded electron cyclotron emission imaging (ECEI) system consisting of new optics lenses with necessary electronics for receiving and processing signals for two dimension (2D) ECEI diagnostics was installed on EAST. Hyperboloid lens were adopted in the new system to optimize the spatial resolutions. The mixers array of sixteen elements measured the plasma electron cyclotron emission at eight frequencies simultaneously, and the profiles of the electron temperature and its fluctuation in an area of 20 cm (vertical) × 6 cm (horizontal) could then be analyzed. Eevolution of sawtooth precursor and crash in EAST was observed.