Fast Switching and Power Combination of High-Power Electron Cyclotron Wave Beams: Principles, Numerical Results, and Experiments
| Autor: | M. Grünert, Alessandro Bruschi, S. Cirant, M.I. Petelin, Ipf Stuttgart, A. G. Litvak, V. Erckmann, Ecrh Groups at Ipp Greifswald, W. Kasparek, Dmitry Yu. Shchegolkov, Burkhard Plaum, M. Thumm, Fzk Karlsruhe, M. Malthaner |
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| Rok vydání: | 2007 |
| Předmět: |
Nuclear and High Energy Physics
020209 energy Beam steering Automatic frequency control 02 engineering and technology 01 natural sciences Multiplexer 010305 fluids & plasmas law.invention Nuclear magnetic resonance Optics law Transmission line Gyrotron 0103 physical sciences 0202 electrical engineering electronic engineering information engineering General Materials Science Diplexer Civil and Structural Engineering Physics business.industry Mechanical Engineering Electric power transmission Nuclear Energy and Engineering business Frequency modulation |
| Zdroj: | Fusion Science and Technology, v.52, 281-290 (2007) |
| ISSN: | 1943-7641 1536-1055 |
| DOI: | 10.13182/fst07-a1507 |
| Popis: | To combine powers from a set of gyrotrons and to switch the combined wave beam between a number of output channels, various kinds of multiplexers can be used. Especially, narrow-band frequency diplexers in connection with small frequency-shift keying of gyrotrons can be used to switch the millimeter-wave power between two output channels. This technique can, for example, be used for fast beam steering for synchronous stabilization of rotating neoclassical tearing modes in tokamaks. Beam steering can be performed by a multistage multiplexer, provided that phase-controlled sources are available. In the paper, various concepts for fast directional switches as well as their integration into transmission lines are discussed. Calculations and low-power measurements of prototypes are presented. A resonant diplexer experiment is at present being prepared to be tested at high power in the electron cyclotron resonance heating (ECRH) system for Wendelstein 7X (W7-X). Requirements and techniques for frequency control of the gyrotrons are discussed, and the results of preliminary frequency modulation experiments are shown. Finally, future prospects for the application of diplexers in large ECRH systems are discussed. |
| Databáze: | OpenAIRE |
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