Design of 5.0-GHz KSTAR lower-hybrid coupler
SCIE
SCOPUS
- Title
- Design of 5.0-GHz KSTAR lower-hybrid coupler
- Authors
- Bae, YS; Paek, CH; Rhee, MJ; Namkung, W; Cho, MH; Bernabei, S; Park, H
- Date Issued
- 2003-07
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- The Korean Superconducting Tokamak Advanced Research (KSTAR) tokamak is being constructed to perform long-pulse, high-beta, advanced tokamak fusion physics experiments by Korean Basic Science Institute (KBSI). The KSTAR tokamak will use the non-inductive plasma current drive system, lower-hybrid current drive (LHCD) system for lone-pulse operation. A 5.0-GHz microwave coupler is designed for KSTAR LHCD experiments. Four high-power klystrons feed 128 guidelets at front coupler using hundred and twenty 3-dB power dividers including 3-dB power splitters in the coupler. The guidelet has a height of 5.5 cm and the width of 0.55 cm in order for the power flux density not to exceed 4.0 kW/cm(2) at the guidelet. The coupler is constructed by laminating a stack of metal plates milled to waveguide patterns. This paper describes detailed design for the 3-dB power splitter, the fixed-phase shifter, and the taper section composing the coupler. Using the High Frequency Structure Simulator (HFSS) program, we achieved a phase difference of +/-0.5degrees and a relative power difference less than 0.2% between two vertical guidelets. (C) 2003 Elsevier Science B.V. All rights reserved.
- Keywords
- KSTAR; LHCD; Tokamak; guidelet
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/33630
- DOI
- 10.1016/S0920-3796(0
- ISSN
- 0920-3796
- Article Type
- Article
- Citation
- FUSION ENGINEERING AND DESIGN, vol. 65, no. 4, page. 569 - 576, 2003-07
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