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Plasma Spraying of a Microwave Absorber Coating for an RF Dummy Load

机译：用于RF虚设载荷的微波吸收涂层的等离子体喷涂

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The European fusion reactor research facility, called International Thermonuclear Experimental Reactor (ITER), is one of the most challenging projects that involves design and testing of hundreds of separately designed reactor elements and peripheric modules. One of the core elements involved in plasma heating are gyrotrons. They are used as a microwave source in electron–cyclotron resonance heating systems (ECRH) for variable injection of RF power into the plasma ring. In this work, the development and application of an alumina-titania 60/40 mixed oxide ceramic absorber coating on a copper cylinder is described. The cylinder is part of a dummy load used in gyrotron testing and its purpose is to absorb microwave radiation generated by gyrotrons during testing phase. The coating is applied by means of atmospheric plasma spraying (APS). The absorber coating is deposited on the inner diameter of a one-meter cylindrical tube. To ensure homogeneous radiation absorption when the incoming microwave beam is repeatedly scattered along the inner tube surface, the coating shows a varying thickness as a function of the tube length. By this it is ensured that the thermal power is distributed homogeneously on the entire inner tube surface. This paper describes a modeling approach of the coating thickness distribution, the manufacturing concept for the internal plasma spray coating and the coating characterization with regard to coating microstructure and microwave absorption characteristics.
机译：欧洲融合反应堆研究设施，称为国际热核实验反应堆（ITER），是最具挑战性的项目之一，涉及设计和测试数百个单独设计的反应器元件和外围模块。血浆加热中涉及的核心元素之一是陀螺仪。它们用作电子 - 回旋谐振加热系统（ECRH）中的微波源，用于可变喷射射频电力进入等离子体环。在这项工作中，描述了铜缸上的氧化铝 - 二氧化钛60/40混合氧化物陶瓷吸收体涂层的开发和应用。气缸是在陀螺仪测试中使用的虚设载荷的一部分，其目的是在测试阶段吸收由陀螺胶产生的微波辐射。通过大气等离子体喷涂（AP）施加涂层。吸收剂涂层沉积在单米圆柱形管的内径上。为了确保当进入的微波束沿内管表面散射时均匀的辐射吸收时，涂层表示作为管长度的函数的变化厚度。由此，确保热功率在整个内管表面上均匀地分布。本文介绍了涂层厚度分布的建模方法，内部等离子体喷涂涂层的制造理念和关于涂覆微观结构和微波吸收特性的涂层表征。

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