A Polarizer with Sinusoidal Grooves in the Electron Cyclotron Resonance Heating System of the HL-2A Tokamak
A Polarizer with Sinusoidal Grooves in the Electron Cyclotron Resonance Heating System of the HL-2A Tokamak
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DOI：
10.1088/1009-0630/11/5/20
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发表时间：
2009-10
影响因子：
1.7
通讯作者：
Zhang Guoqing;K. Nagasaki;Zhou Jun;Wang-ling He;Huang Mei;Chen Gangyu;Rao Jun
中科院分区：
文献类型：
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作者：
Zhang Guoqing;K. Nagasaki;Zhou Jun;Wang-ling He;Huang Mei;Chen Gangyu;Rao Jun
本文介绍了HL-2A装置电子回旋共振加热（ECRU）系统中正弦槽极化器的理论计算和实验结果。计算是基于衍射光栅矢量理论中的积分方法，通过低功率实验得到的偏振特性与数值计算结果吻合较好。在ECRU传输线的斜接弯曲中组装起偏器的情况下，在高功率实验中也期望纯普通模式（O模式）和非常模式（X模式）偏振波，这取决于起偏器旋转角和电子回旋（EC）波束的环形注入角。在HL-2A装置上成功地进行了二次谐波X模实验。实验结果表明，电子温度从0.8 keV（欧姆加热阶段）增加到1.5 keV（第二X模式加热阶段）。
Theoretical calculation and experimental results for a polarizer with sinusoidal grooves used in the electron cyclotron resonance heating (ECRU) system of the HL-2A tokamak are presented. The calculation is based on an integral method developed in the vector theory of diffraction gratings, and the polarization characteristics obtained with a low-power test are in good agreement with the numerical calculated results. With the polarizer assembled in a miter bend in the ECRU transmission line, pure ordinary mode (O-mode) and extraordinary mode (X-mode) polarized waves are also expected in the high-power experiment, depending on the polarizer rotation angle and the toroidal injection angle of the electron cyclotron (EC) wave beam. Second-harmonic X-mode experiments were successfully explored in HL-2A. Experimental result revealed that the electron temperature increased from 0.8 keV (Ohmic heating phase) to 1.5 keV (second X-mode heating phase).