A detailed comparison of antenna impedance measurements on ASDEX Upgrade with the ion cyclotron range of frequencies antenna code TOPICA
A detailed comparison of antenna impedance measurements on ASDEX Upgrade with the ion cyclotron range of frequencies antenna code TOPICA
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DOI：
10.1088/0029-5515/55/11/113003
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发表时间：
2015-09
期刊：
影响因子：
3.3
通讯作者：
I. Stepanov;J. Noterdaeme;V. Bobkov;H. Faugel;D. Coster;D. Milanesio;R. Maggiora;G. Siegl;R. Bilato;M. Brambilla;G. Verdoolaege;F. Braun;H. Fünfgelder;R. D’Inca;W. Suttrop;A. Kallenbach;J. Schweinzer;E. Wolfrum;R. Fischer;A. Mlynek;V. Nikolaeva;L. Guimarais
中科院分区：
文献类型：
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作者：
I. Stepanov;J. Noterdaeme;V. Bobkov;H. Faugel;D. Coster;D. Milanesio;R. Maggiora;G. Siegl;R. Bilato;M. Brambilla;G. Verdoolaege;F. Braun;H. Fünfgelder;R. D’Inca;W. Suttrop;A. Kallenbach;J. Schweinzer;E. Wolfrum;R. Fischer;A. Mlynek;V. Nikolaeva;L. Guimarais
ASDEX升级的新天线诊断，在每个离子回旋频率范围天线的馈线上的电压和电流探针对的形式，靠近输入端口，使得有可能详细研究ASDEX升级两条天线在变化的负载条件下的行为，并将这些测量结果与使用TOPICA代码的模拟结果进行比较。本文的工作通过使用输入阻抗（更准确地说，是复电压反射系数Γ？用于比较，而不是更常用的负载电阻或耦合功率。用于模拟的电子密度分布重建从氘-碳-氮干涉仪和锂束发射光谱测量，边缘局部模式同步和平均时间间隔从10到200毫秒取决于情况下，112例进行了比较，从七个ASDEX升级放电与广泛不同的等离子体参数和两个工作频率（30和36.5 MHz）。非常好的协议，|Γ| ?>在天线3上的测量中发现了这一点（在绝大多数情况下，尽管由于高反射，绝对值的差异相当高（高达± 50%）。差异的来源进行了讨论。
New antenna diagnostics on the ASDEX Upgrade, in the form of voltage and current probe pairs on the feeding lines of each ion cyclotron range of frequencies antenna, close to the input ports, have made it possible to study in detail the behavior of the ASDEX Upgrade two-strap antenna under changing loading conditions, and compare these measurements with the results of simulations using the TOPICA code. The present work extends previous studies by using the input impedance (more precisely, the complex voltage reflection coefficient Γ ?>) on each antenna port for comparison, instead of the more commonly used loading resistance or coupled power. The electron density profiles used for the simulation were reconstructed from the deuterium-carbon-nitrogen interferometer and lithium beam emission spectroscopy measurements, edge-localized mode-synchronized and averaged over time intervals from 10 to 200 ms depending on the case; 112 cases were compared from seven ASDEX Upgrade discharges with widely different plasma parameters and two operating frequencies (30 and 36.5 MHz). Very good agreement in |Γ| ?> was found with the measurements on antenna 3 ( in a significant majority of cases, although the discrepancies in the absolute values were rather high (up to ∼50%) due to high reflection. Sources of discrepancy are discussed.