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Power Compensation for icrf heating in EAST

Plasma Science and Technology 2016年第8期18卷 870-874页

作者：陈根秦成明毛玉周赵燕平袁帅张新军 Institute of Plasma Physics Chinese Academy of Sciences

The source system covering a working frequency range of 24 MHz to 70 MHz with a total maximum output power of 12 MW has already been fabricated for Ion Cyclotron Range of Frequency（icrf） heating in EAST from 2012. There are two continuous wave（CW） antennas consisting of four launching elements each fed by a separate 1.5 MW transmitter. Due to the strong mutual coupling among the launching elements, the injection power for launching elements should be imbalance to keep the k｜｜（parallel wave number） spectrum of the launcher symmetric for icrf heating. Cross power induced by the mutual coupling will also induce many significant issues,such as an uncontrollable phase of currents in launching elements, high voltage standing wave ratio（VSWR）, and impedance mismatching. It is necessary to develop a power compensation system for antennas to keep the power balance between the feed points. The power balance system consists of two significant parts： a decoupler and phase control. The decoupler helps to achieve ports isolation to make the differential phase controllable and compensate partly cross power. After that, the differential phase of 0 or π will keep the power balance of two feed points completely. The first power compensation system consisting of four decouplers was assembled and tested for the port B antenna at the working frequency of 35 MHz. With the application of the power compensation system, the power balance, phase feedback control, and voltage standing wave ratio（VSWR） had obviously been improved in the 2015 EAST campaign.

关键词： EAST icrf heating power compensation

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维普期刊数据库

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Tunable biasing magnetic field design of ferrite tuner for icrf heating system in EAST

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Plasma Science and Technology 2017年第11期19卷 82-91页

作者： Manman XU Yuntao SONG Gen CHEN Yanping ZHAO Yuzhou MAO Guang LIU Zhen PENG Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China

Ion cyclotron range of frequency（icrf） heating has been used in tokamaks as one of the most successful auxiliary heating tools and has been adopted in the EAST. However, the antenna load will fluctuate with the change of plasma parameters in the icrf heating process. To ensure the steady operation of the icrf heating system in the EAST, fast ferrite tuner（FFT） has been carried out to achieve real-time impedance matching. For the requirements of the FFT impedance matching system, the magnet system of the ferrite tuner（FT） was designed by numerical simulations and experimental analysis, where the biasing magnetic circuit and alternating magnetic circuit were the key researched parts of the ferrite magnet. The integral design goal of the FT magnetic circuit is that DC bias magnetic field is 2000 Gs and alternating magnetic field is±400 Gs. In the FTT, E-type magnetic circuit was adopted. Ferrite material is Nd Fe B with a thickness of 30 mm by setting the working point of Nd Fe B, and the ampere turn of excitation coil is 25 through the theoretical calculation and simulation analysis. The coil inductance to generate alternating magnetic field is about 7 m H. Eddy-current effect has been analyzed, while the magnetic field distribution has been measured by a Hall probe in the medium plane of the biasing magnet. Finally, the test results show the good performance of the biasing magnet satisfying the design and operating requirements of the FFT.

关键词： EAST icrf heating ferrite tuner biasing magnet

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维普期刊数据库

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icrf Heated Long-Pulse Plasma Discharges in LHD

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Plasma Science and Technology 2006年第1期8卷 28-32页

作者： R. KUMAZAWA T. SEKI T. MUTOH K. SAITO T. WATARI Y. NAKAMURA M. SAKAMOTO T. WATANABE S. KUBO T. SHIMOZUMA Y. YOSHIMURA H. IGAMI Y. TAKEIRI Y. OKA K. TSUMORI M. OSAKABE K. IKEDA K. NAGAOKA O. KANEKO J. MIYAZAWA S. MORITA K. NARIHARA M. SHOJI S. MASUZAKI M. GOTO T. MORISAKI B. J. PETERSON K. SATO T. TOKUZAWA N. ASHIKAWA K. NISHIMURA H. FUNABA H. CHIKARAISHI T. NOTAKE Y. TORII H. OKADA M. ICHIMURA H. HIGAKI Y. TAKASE H. KASAHARA F. SHIMPO G.NOMURA C.TAKAHASHI M.YOKOTA A. KATO 赵燕平 J. S. YOON J. G. KWAK H. YAMADA K. KAWAHATA N. OHYABU K. IDA Y. NAGAYAMA N. NODA A. KOMORI S. SUDO O. MOTOJIMA National Institute for Fusion Science Toki Japan Kyusyu University Kasuga Japan Nagoya University Faculty of Engineering Nagoya Japan Kyoto University Institute of Advanced Energy Uji Japan Tsukuba University Plasma Research Center Tsukuba Japan Tokyo University Graduate School of Frontier Sciences Tokyo Japan Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China KAERI 150 Deogjin-dong Yuseong-gu Daejeon Korea Rep.

A long-pulse plasma discharge for more than 30 min. was achieved on the Large Helical Device （LHD）. A plasma of ne = 0.8 × 10^19 m^-3 and T10 = 2.0 keV was sustained with PICH = 0.52 MW, PECH = 0.1 MW and averaged PNBI = 0.067 MW. Total injected heating energy was 1.3 G J, which was a quarter of the prepared RF heating energy. One of the keys to the success of the experiment was a dispersion of the local plasma heat load to divertors, accomplished by shifting the magnetic axis inward and outward.

关键词： helical/stellarator configuration icrf heating steady state operation

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