Real-time impedance matching system for ICRF heating in LHD

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• 作者：K. Saito ; C. Takahashi ; M. Yokota ; G. Nomura ; F. Shimpo ; T. Seki ; H. Kasahara ; R. Kumazawa ; J.S. Yoon ; J.G. Kwak ; Y. Zhao ; T. Mutoh ; A. Komori ; The LHD Experimental Group
• 关键词：ICRF heating ; LHD ; Liquid stub tuner ; Steady-state operation ; Feedback control
• 刊名：Fusion Engineering and Design
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：83
• 期：2-3
• 页码：245-248
• 全文大小：329 K

文摘

In the Large Helical Device (LHD), long-pulse plasma experiments have been conducted using an ion cyclotron range of frequencies (ICRFs) heating system. Real-time impedance matching is necessary to keep injecting ICRF heating power into the plasma against the variation of the antenna impedance that changes gradually during a long-pulse plasma discharge. A feedback control system for the real-time impedance matching was constructed and utilized for long-pulse plasma discharges. As a component of the impedance matching device, liquid stub tuners were used. The reflected power ratio was reduced and kept sufficiently low by controlling the liquid heights during long-pulse plasma discharges, and the problem of the gradual increase in the reflected power was solved.