The results of high power testing of new water-cooled ECH waveguide components for ITER are presented. The components are a precision-coupled 4.2 m waveguide assembly, a short expansion joint, and water-cooled waveguide for gyrotron commissioning. The testing was conducted at the QST Naka Fusion Institute using gyrotron pulses of 450 kW at 170 GHz for 300 s. Analysis shows that the power absorbed per unit length for the various waveguide components are dependent on location in the transmission line with respect to high order mode generators, such as miter bends. Additionally, larger-than-expected reflections from the load led to high absorption levels in the transmission line.
ITER用新型水冷ECH波导组件的高功率测试结果已呈现。该组件包括精密耦合的4.2米波导组件、短膨胀节以及用于回旋管调试的水冷波导。测试在日本量子科学技术研究开发机构那珂核融合研究所进行，采用170 GHz、450 kW的回旋管脉冲，持续时间为300秒。分析表明，各单位长度波导组件的功率吸收取决于其在传输线中相对于高次模发生器（如斜接弯头）的位置。此外，来自负载的反射超出预期，导致传输线中产生了较高的吸收水平。