CAJ | 학술논문

通过数值模拟研究了低杂波多结波导阵天线的耦合特性.采用线型耦合理论,用艾黎函数计算了等离子体阻抗,推导出常规波导阵对等离子体的散射矩阵,并利用它和天线自身的散射矩阵研究了HT-7装置低杂波多结波导阵天线的耦合特性;计算了其平均功率反射系数、方向性系数和功率谱与等离子体边缘密度和主波导相位差等参数的关系.结果表明,与常规波导阵相比,由于多结波导阵天线存在自匹配特性,其天线功率反射系数小,且对相位不敏感.但由于存在多余副瓣,驱动效率较低.
통과수치모의연구료저잡파다결파도진천선적우합특성.채용선형우합이론,용애려함수계산료등리자체조항,추도출상규파도진대등리자체적산사구진,병이용타화천선자신적산사구진연구료HT-7장치저잡파다결파도진천선적우합특성;계산료기평균공솔반사계수、방향성계수화공솔보여등리자체변연밀도화주파도상위차등삼수적관계.결과표명,여상규파도진상비,유우다결파도진천선존재자필배특성,기천선공솔반사계수소,차대상위불민감.단유우존재다여부판,구동효솔교저.
The coupling properties of the Lower Hybrid Current Drive (LHCD) multijunction (MJ) launcher are investigated numerically. The Airy function is used to calculate the plasma impedance and the grill-plasma scattering matrix is deduced, then the coupling properties of the HT-7 LHCD MJ launcher are studied with the antenna scattering matrix and the grill-plasma scattering matrix based on the liner coupling theory. The average power reflection coefficient, directivity, power spectrum are obtained for different edge plasma densities and for different phasings between main waveguides. The results show that the power reflection coefficient of the MJ launcher is much lower and less sensitive to the phase difference than that of the conventional grill because of its self-matching characteristic. However, due to the excrescent side lobe, the current drive efficiency is lower.