Development of a 140 GHz Steerable Launcher for the HL-2A ECRH System
Development of a 140 GHz Steerable Launcher for the HL-2A ECRH System
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DOI：
10.1088/1009-0630/15/12/16
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发表时间：
2013-06
影响因子：
1.7
通讯作者：
Mei Huang;Gangyu Chen;Jun Zhou;Chao Wang;Tieliu Zheng;He Wang;Bo Lu;J. Rao;Liu Yong
中科院分区：
文献类型：
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作者：
Mei Huang;Gangyu Chen;Jun Zhou;Chao Wang;Tieliu Zheng;He Wang;Bo Lu;J. Rao;Liu Yong
HL-2A托卡马克装置设计并安装了新型电子回旋共振加热电流驱动（ECRH/ECCD）发射系统，可注入四束光束，并可在环形和极向方向上独立连续进行毫米波束扫描，用于ECRH/ECCD实验。该发射器连接到四根毫米波线路，能够传输高达 3 MW 的高功率，其中包括两个 1 MW/140 GHz/3 s 和两个 0.5 MW/68 GHz/1 s 波束。基于TORAY-GA程序的射线追迹模拟，140GHz波束的波束扫描范围在环形方向为−15°~15°，在极向方向为0°~10°，可覆盖等离子体截面的一半，可以满足高级物理实验的要求。两个 140 GHz 光束的等离子体中的光束半径分别为 17.1 mm 和 20 mm，两个 68 GHz 光束的等离子体半径分别为 29.5 mm，从而允许吸收功率的高度局部化。事实证明，转向系统性能可靠，驱动轴位移与镜面旋转角度线性关系良好。此外，通过同时设置注入角度和偏振来优化波束的注入性能，以实现理想的纯O模式或X模式注入。
A new electron cyclotron resonance heating and current drive (ECRH/ECCD) launcher system has been designed and installed on the HL-2A tokamak to inject four beams and enable continuous millimeter-wave beam scanning independently in the toroidal and poloidal directions for ECRH/ECCD experiments. The launcher is connected to four mm-wave lines capable of transmitting high power up to 3 MW with two 1 MW/140 GHz/3 s and two 0.5 MW/68 GHz/1 s beams. Based on ray tracing simulation using the TORAY-GA code, the scanning range of wave beams is − 15°~15° in the toroidal direction and 0°~10° in the poloidal one for 140 GHz beams, which could cover half of the cross section of plasmas and can satisfy the requirements of advanced physical experiments. The beam radii in the plasma is 17.1 mm and 20 mm for the two 140 GHz beams and 29.5 mm for the two 68 GHz beams, respectively, allowing a very high localization of the absorbed power. The performance of the steering system was proven to be reliable and the linearity is perfect between the displacement of drive shaft and rotate angle of mirror. Additionally the injection performance of the wave beams was optimized by simultaneously setting the injection angle and the polarization to realize desirable pure O- or X-mode injection.