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Electromagnetic Field Simulation for ICRF Antenna and Comparison with Experimental Results in LHD

机译：LRF中ICRF天线的电磁场模拟及其与实验结果的比较

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摘要

Ion cyclotron range of frequencies (ICRF) heating antennas in LHD are numerically simulated and analyzed by HFSSTM finite-element electromagnetic wave field calculation code. The model includes an accurate vacuum chamber wall of LHD and ICRF antenna structure and a simple model of plasma in a helical configuration. Antenna coupling with plasma is simulated by an artificial freshwater volume with enhanced high permittivity of ε = 500-2000. RF current distribution and electromagnetic field distribution on and near the ICRF antenna are analyzed and well elucidated through a comparison with the experimental results. The frequency dependence of experimental loading resistance can be simulated by the calculation, and the RF dissipation on the antenna structure is studied and compared with experimental results. The local high heat load around gaps between the carbon side protectors is well explained, and the effect of gap distance is studied. Comparison with the experimental results reveals that the ICRF heating in the LHD, including the antenna and helical plasma, is well simulated by commercial HFSSTM code analysis. It will also be useful for future improvements in ICRF antenna design in helical devices.
机译：通过HFSS TM 有限元电磁波场计算代码对LHD中离子回旋加速器频率加热天线的频率范围进行了数值模拟和分析。该模型包括一个准确的LHD真空室壁和ICRF天线结构，以及一个简单的螺旋形等离子体模型。通过人工淡水量模拟具有高等介电常数ε= 500-2000的天线与等离子体的耦合。通过与实验结果进行比较，分析并很好地阐明了ICRF天线上及其附近的RF电流分布和电磁场分布。通过计算可以模拟实验负载电阻的频率依赖性，并研究了天线结构的射频耗散，并与实验结果进行了比较。很好地解释了碳侧保护器之间缝隙周围的局部高热负荷，并研究了缝隙距离的影响。与实验结果的比较表明，通过商业HFSS TM 代码分析，可以很好地模拟LHD中ICRF加热，包括天线和螺旋等离子体。对于将来改进螺旋设备中ICRF天线设计也将很有用。

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