Abstract:

Electron cyclotron emission imaging (ECEI) diagnostic system with 384 channels was installed on EAST tokamak. Since EAST was equipped with 4MW ICRF system, 4MW LHCD system and NBI system, the ECEI diagnostic system on EAST was heavily interfered, especially by the lower hybrid wave. The optimization of the electromagnetic shielding is presented, which help to reduce the interference to 40dB. Appropriate copper mesh shield and the correct ground connection are the key solutions. The comparisons of the ECEI raw signals before and after the optimization clearly show that the shielding performance is greatly improved.

Key words: Electron cyclotron emission imaging system, Lower hybrid current drive, Electromagnetic shielding

摘要：

介绍了EAST 装置上的384 道(极向24 道径向16 道)的外差混频式电子回旋辐射成像诊断系统及其在EAST 及其复杂的电磁环境中的运行情况。在低杂波电流驱动期间，高灵敏度的电子回旋辐射成像系统受到严重干扰以至于无法提供正确的实验数据。通过优化系统各模块的接地、外加多层铜网屏蔽等措施，使得ECEI 系统屏蔽效能与改善之前相比提高了40dB，基本保障了EAST 装置上电子回旋辐射成像诊断的正常工作。

关键词: 电子回旋辐射成像, 低杂电流驱动, 电磁屏蔽