An improved method to measure the antenna resistance and radiated power of ICRF-antennas using current probes
An improved method to measure the antenna resistance and radiated power of ICRF-antennas using current probes
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DOI：
10.1016/j.fusengdes.2011.02.092
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发表时间：
2011-10
影响因子：
1.7
通讯作者：
H. Faugel;V. Bobkov;F. Braun;T. Franke;D. Hartmann;M. Kircher;J. Noterdaeme;G. Siegl
中科院分区：
文献类型：
--
作者：
H. Faugel;V. Bobkov;F. Braun;T. Franke;D. Hartmann;M. Kircher;J. Noterdaeme;G. Siegl
ICRF天线的耦合特性取决于等离子体边界特性，而等离子体边界特性可以通过H-Mode或elm进行修饰。在双根调谐器匹配系统附近用一对定向耦合器测量天线馈线的阻抗和输入功率。这些测量包括传输线和天线的损耗。分离辐射功率和损耗的一种方法是测量天线环路中的电流。在2009/2010年ASDEX Upgrade关闭期间，在其中一个ICRF天线的天线环路短段附近安装了两个电流探头，以测量天线环路短段的电流。这些信号提供了一种计算天线电阻和发射功率的新方法，并可用于将发射功率与匹配系统和天线传输线路中的损耗分离开来。虽然电流探头的信号幅度的校准需要进一步研究，但幅度与天线环路中的电流成正比。有了这些探头和一个新的基于实时dsp的系统，辐射功率（与总功率相反，即包括损耗功率）可以反馈控制。
The coupling properties of ICRF antennas depend on the plasma boundary characteristics, which are modified for example by H-Mode or ELMs. The impedance and the power into the antenna feeding line are measured with a pair of directional couplers near the double stub tuner matching system. Those measurements include the losses of the transmission line and the antenna. An approach to separate the radiated power from the losses is to measure the current in the antenna loops. To measure the current in the short of the antenna loop two current probes have been installed near the short of the antenna loops in one of the ICRF antennas during the 2009/2010 shutdown of ASDEX Upgrade. These signals allow a new approach in calculating the antenna resistance and the launched power and can be used to separate the launched power from the losses in the matching system and transmission lines up to the antenna. Although the calibration of the signal amplitude from the current probes needs further investigation, the amplitude is proportional to the current in the antenna loop. With those probes and a new real-time DSP-based system, the radiated (as opposed to the total power i.e. including loss power) power can be feedback controlled.