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

被引：44

作者：

Kasparek, W. ^{[1
]}

Petelin, M. I. ^{[2
]}

Shchegolkov, D. Yu ^{[2
]}

Erckmann, V. ^{[3
]}

Plaum, B. ^{[1
]}

Bruschi, A. ^{[4
]}

机构：

[1] Univ Stuttgart, Inst Plasmaforsch, D-70569 Stuttgart, Germany

[2] RAS, Inst Appl Phys, Nizhnii Novgorod 603950, Russia

[3] EURATOM, Max Planck Inst Plasmaphys, D-17491 Greifswald, Germany

[4] EURATOM ENEA CNR Ass, Ist Fis Plasma, I-20125 Milan, Italy

[5] Forschungszentrum Karlsruhe, EURATOM Assoc, IHM, D-76021 Karlsruhe, Germany

来源：

NUCLEAR FUSION | 2008年 / 48卷 / 05期

关键词：

D O I：

10.1088/0029-5515/48/5/054010

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

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.

引用

页数：9

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