Power Compensation for ICRF Heating in EAST
Power Compensation for ICRF Heating in EAST
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EAST 中 ICRF 加热的功率补偿
DOI：
10.1088/1009-0630/18/8/14
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发表时间：
2016-08
影响因子：
1.7
通讯作者：
ZHANG Xinjun
中科院分区：
文献类型：
--
作者：
CHEN Gen;QIN Chengming;MAO Yuzhou;ZHAO Yanping;YUAN Shuai;ZHANG Xinjun
从2012年开始，已经为EAST的离子回旋频率范围（ICRF）加热制造了工作频率范围为24 MHz至70 MHz、总最大输出功率为12 MW的源系统。有两个连续波（CW）天线组成的四个发射元件，每个由一个单独的1.5兆瓦发射机馈电。由于各发射单元之间存在很强的互耦，为了保证系统的k||发射器的（平行波数）频谱对于ICRF加热对称。由互耦引起的交叉功率也将引起许多重要问题，例如发射元件中电流的不可控制相位、高电压驻波比（VSWR）和阻抗失配。为了保证天线各馈电点之间的功率平衡，有必要研制一种天线功率补偿系统。功率平衡系统由两个重要部分组成：倍频器和相位控制。该倍频器有助于实现端口隔离，使差分相位可控，并部分补偿交叉功率。之后，0或π的差分相位将完全保持两个馈电点的功率平衡。第一个功率补偿系统由四个双工器组成，并在工作频率为35 MHz的端口B天线上进行了组装和测试。在2015年EAST活动中，功率补偿系统的应用使功率平衡、相位反馈控制和电压驻波比（VSWR）得到明显改善。
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.
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