Design and operations of a load-tolerant ICRH system in Experimental Advanced Superconducting Tokamak

Nuclear Fusion Pub Date : 2024-04-18 DOI:10.1088/1741-4326/ad4048

Lunan Liu, Xinjun Zhang, Chengming Qin, Y. Mao, Shuai Yuan, Wei Zhang, Hua Yang, Lei Wang, Yan Cheng, Kai Zhang

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Abstract

Ion cyclotron resonance heating (ICRH) has been a dependable tool for sturdy plasma heating with high RF power of several megawatts. However, a sudden increase in the reflected power during ICRH heating experiments is a problem that should be solved for future fusion experimental devices. To solve this issue, the load tolerant matching network have been designed for ICRH system in EAST Tokamak. The matching network includes 3-stub tuner impedance matching system, conjugate-T structure, 30 Ω to 50 Ω transmission line and center grounded antenna strap. By keeping a low reflection ratio in the network for a wide range of resistance, this matching network could allow sturdy high-power operations without fast impedance matching in EAST tokamak. In our matching network, the two arms of a conjugate-T were designed to have λ/2 length difference which could mitigate current imbalance and antenna poloidal phasing out of control problem. And the T-point corresponds to the maximum point of standing wave voltage, which could greatly improve the input impedance of antenna.

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先进超导实验托卡马克中容错 ICRH 系统的设计与运行

离子回旋共振加热（ICRH）一直是利用几兆瓦高射频功率进行坚固等离子体加热的可靠工具。然而，ICRH 加热实验中反射功率的突然增加是未来核聚变实验设备需要解决的一个问题。为了解决这个问题，我们为 EAST 托卡马克中的 ICRH 系统设计了耐负载匹配网络。该匹配网络包括 3 桩调谐器阻抗匹配系统、共轭 T 结构、30 Ω 至 50 Ω 传输线和中心接地天线带。通过在宽电阻范围内保持网络的低反射比，该匹配网络可以在 EAST 托卡马克中实现坚固的大功率运行，而无需快速阻抗匹配。在我们的匹配网络中，共轭 T 的两臂被设计为具有 λ/2 长度差，这可以缓解电流不平衡和天线极性相位失控问题。而且 T 点对应驻波电压的最大点，可以大大改善天线的输入阻抗。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nuclear Fusion

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