1. A Feasibility Study on a Load Resilient Antenna for the KSTAR ICRF Heating System
- Author
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Jong-Gu Kwak, Suk-Kwon Kim, C. K. Hwang, Y. D. Bae, J. S. Yoon, S. J. Wang, S. K. Kim, Suwon Cho, Philip M. Ryan, and David Rasmussen
- Subjects
Coupling ,Engineering ,Electric power transmission ,business.industry ,Transmission line ,Acoustics ,KSTAR ,RF power amplifier ,Electrical engineering ,Antenna (radio) ,Electric current ,business ,Electrical impedance - Abstract
An effective rf power coupling for ELMy plasmas is one of the key issues for the ICRF heating. The conjugate T matching, which was adopted by the ITER design, is known to be an effective solution for this problem. The KSTAR ICRF antenna consists of 4 current straps with the transmission line configurations of resonant loops. The conjugate T matching concept is applied to each strap by conjugating the impedance of the upper and the lower parts of the resonant loops at the T point and the electrical lengths of the upper and the lower parts are adjusted by using the two phase shifters. In this work, the feasibility of a conjugate T matching is studied for the KSTAR ICRF antenna. With a mutual coupling of 20% between the upper and the lower current straps, the KSTAR antenna is investigated for its load resilient characteristics against a variation of the plasma loading resistance. In addition, the effects of a phase difference of the antenna current between the upper and the lower straps on a rf power coupling to plasmas are investigated by using a full wave simulation code.
- Published
- 2007
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