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A fast switch, combiner and narrow-band filter for high-power millimetre wave beams

机译：快速开关，合路器和窄带滤波器，用于大功率毫米波光束

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摘要

A fast directional switch (FADIS) is described, which allows controlled switching of high-power microwaves between two outputs. A possible application could be synchronous stabilization of neoclassical tearing modes (NTMs). Generally, the device can be used to share the installed EC power between different types of launchers or different applications (e.g. in ITER, midplane/upper launcher). The switching is performed electronically without moving parts by a small frequency-shift keying of the gyrotron (some tens of megahertz), and a narrow-band diplexer. The device can be operated as a beam combiner also, which offers attractive transmission perspectives in multi-megawatt ECRH systems. In addition, these diplexers are useful for plasma diagnostic systems employing high-power sources due to their filter characteristics. The principle and the design of a four-port quasi-optical resonator diplexer is presented. Low-power measurements of switching contrast, mode purity and efficiency show good agreement with theory. Preliminary frequency modulation characteristics of gyrotrons are shown, and first results from high-power switching experiments using the ECRH system for W7-X are presented.
机译：描述了一种快速方向开关（FADIS），它允许在两个输出之间进行大功率微波的受控切换。一种可能的应用可能是新古典撕裂模式（NTM）的同步稳定化。通常，该设备可用于在不同类型的发射器或不同应用程序之间共享已安装的EC电源（例如，在ITER，中面板/上发射器中）。通过回旋管的小频移键控（几十兆赫兹）和窄带双工器，以电子方式进行切换而无需移动部件。该设备还可以用作光束组合器，在多兆瓦ECRH系统中提供了诱人的传输前景。另外，由于其滤波器特性，这些双工器可用于采用大功率源的等离子体诊断系统。介绍了四端口准光学谐振器双工器的原理和设计。低功率测量开关对比度，模式纯度和效率与理论吻合良好。显示了回旋管的初步调频特性，并给出了使用ECRH系统针对W7-X进行的大功率开关实验的初步结果。

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