RF Behavior and Launcher Design for a Fast Frequency Step-tunable 236 GHz Gyrotron for DEMO

被引：4

作者：

Kalaria, P. C. ^{[1
]}

Avramidis, K. A. ^{[1
]}

Franck, J. ^{[1
]}

Gantenbein, G. ^{[1
]}

Illy, S. ^{[1
]}

Jin, J. ^{[1
]}

Pagonakis, I. Gr. ^{[1
]}

Thumm, M. ^{[1
,2
]}

Jelonnek, J. ^{[1
,2
]}

机构：

[1] Karlsruher Inst Technol, Inst Pulsed Power & Microwave Technol IHM, Campus Nord,Hermann Von Helmholtz Pl 1,Bldg 421,R, D-76344 Eggenstein Leopoldshafen, Germany

[2] Karlsruhe Inst Technol, Inst Radio Frequency Engn & Elect IHE, Karlsruhe, Germany

来源：

FREQUENZ | 2017年 / 71卷 / 3-4期

关键词：

DEMO; frequency tenability; gyrotron; plasma instabilities control; tokamak; quasi-optical launcher; WINDOW;

D O I：

10.1515/freq-2016-0212

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

As part of the EUROfusion project, the conceptual design of a 1MW 236 GHz hollow-cavity gyrotron is ongoing at IHM, KIT for a DEMOnstration Power Plant (DEMO), along with a 2MW coaxial-cavity design concept. Fast frequency-tunable gyrotrons (tuning within a few seconds) are recommended for plasma stabilization using a non-steerable antenna. In this work, the mode-selection approach for such a frequency-tunable gyrotron is presented and suitable operating modes for fast frequency tunability are suggested. Magnetic field tuning has been studied as an effective technique to tune the gyrotron operating frequency. The step-tunability of the 236 GHz gyrotron within the frequency range of +/- 10 GHz in steps of 2-3 GHz is demonstrated in numerical simulations. A hybrid-type Quasi-Optical Launcher (QOL) has been designed for a step-frequency tunable gyrotron with sufficiently high Fundamental Gaussian Mode Content (FGMC).

引用

页码：161 / 171

页数：11

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