HT-7低杂波相控天线阵的耦合特性分析

HT-7低杂波相控天线阵的耦合特性分析

内容简介：HT-7 2.45 GHz低混杂波系统利用相控波导阵列将微波能量耦合到等离子体中.本工作基于二维线性耦合理论,主要利用Step+Ramp的等离子体密度剖面模型,详细分析了HT-7装置上各种关键参数 (如边缘密度、密度梯度、相邻主波导相位差等) 下低杂波波导阵列天线的耦合特性.分析表明,通过调节主波导之间-90°～90°的相差,天线的n∥谱可在1.93～3.15之间灵活调节;当天线口边缘密度为0.5×10~(18)～2×10~(18) m~(-3)时,波导阵天线的反射系数可保持在5% 以下,方向性系数很大;主波导之间相位差的改变对波导阵的驱动效率有很大影响.

Abstract：Phased waveguide arrays on the HT-7 2.45 GHz lower hybrid current drive (LHCD) system are used to launch the waves into the plasma. Based on the two-dimensional linear coupling theory and the Step + Ramp plasma density profile model, the main coupling property of the launchers was investigated under different kinds of key plasma parameters, such as the edge density, the density gradient and the phasing between adjacent main waveguides. The analysis based on calculation shows that the wave spectrum ranges from 1.93 to 3.15 when the phase between adjacent main waveguides is changed between -90° and 90°. The global average reflection coefficient of the waveguide arrays is below 5% in the range of edge plasma density from 0.5×10~(18) m~(-3) to 2×10~(18) m~(-3), and the n∥-weighted directivity is rather large. When the adjacent main waveguide phasing varies, the current drive efficiency of the launchers will be affected obviously.

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关键词：耦合, 低杂波电流驱动, 波导阵, 功率谱,