| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Design of a TE10-TE30 Rectangular Mode Converter for 4.6GHz LHCD Launcher in the Experimental Advanced Superconducting Tokamak |
WANG Xiao-Jie, LIU Fu-Kun, ZHAO Lian-Min, JIA Hua, LIU Hong-Bao, KUANG
Guang-Li |
| Institute of Plasma Physics, Chinese Academy of Sciences, PO BOX 1126, Hefei 230031 |
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| Cite this article: |
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WANG Xiao-Jie, LIU Fu-Kun, ZHAO Lian-Min et al 2009 Chin. Phys. Lett. 26 025202 |
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Abstract A compact rectangular TE10-TE30 mode converter is developed for the lower hybrid current drive (LHCD) launcher on the Experimental Advanced Superconducting Tokamak (EAST) at 4.6GHz. The converter with periodic width perturbation aims to divide the microwave power into three sub-waveguides in the poloidal direction. We present the design and numerical calculation of the mode converter. Calculations are performed on the ripple wall converter by codes based on numerical solving the coupled-mode differential equations and on the simulation of the High Frequency Structure Simulator (HFSS) package. The resulting conversion efficiency from TE10 mode to TE30 mode exceeds 95% within the bandwidth from 4.56GHz to 4.64GHz, and the return loss of the oversized transducer can be considerably decreased to 0.068% by means of a capacitive button embedded in the E-plane of the waveguide.
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| Keywords:
52.55.Fa
52.50.Sw
84.40.Az
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Received: 01 September 2008
Published: 20 January 2009
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| PACS: |
52.55.Fa
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(Tokamaks, spherical tokamaks)
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52.50.Sw
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(Plasma heating by microwaves; ECR, LH, collisional heating)
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84.40.Az
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(Waveguides, transmission lines, striplines)
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