Abstract:

The design, simulation and test of the magnetic probe for the measurement of parallel wave-number spectrum of lower hybrid waves at 2.45GHz in EAST have been performed. Using the software COMSOL Multiphysics 5.2 based on finite element simulation, the size of the magnetic probe is simulated and optimized. Especially, some key dimensions that affect the coupling performance of the magnetic probe, such as dimension of the loop and the slit on the shield, the thickness of ceramic are determined. The test results show that the magnetic probe has good coupling performance for 2.45GHz lower hybrid waves and the ability for identifying wave polarization, which are in consistence with the theoretical simulation results. This work provides an important reference for the establishment of parallel wave-number measurement diagnosis system in EAST, which is critical for further high-density LHCD experiments.

Key words: Lower hybrid wave, Parallel wave-number, Magnetic probe

摘要：

针对EAST上2.45GHz低杂波，完成了低杂波平行波数测量磁探针的设计、仿真与测试。利用有限元仿真软件COMSOL Multiphysics 5.2对磁探针尺寸进行仿真优化，确定了单匝环、矩形缝以及陶瓷片厚度等影响磁探针耦合性能的关键尺寸。测试结果表明，该磁探针对2.45GHz低杂波有良好的耦合性能和鉴别波极化的能力，与仿真结果一致。研究结果为EAST装置上低杂波平行波数测量诊断系统的建立提供重要的参考依据，从而为进一步开展高密度低杂波电流驱动实验研究提供必要的实验数据。

关键词: 低杂波, 平行波数, 磁探针