Engineering Design of Plasma Current Measurement in EXL-50U Spherical Torus: Integrating Rogowski Coil and Water-Cooled Optical Fiber Sensors

IF 1.5 4区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

IEEE Transactions on Plasma Science Pub Date : 2025-07-10 DOI:10.1109/TPS.2025.3576816

Jia Li;Dong Guo;Renyi Tao;Zhixin Wang;Chao Wu

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Abstract

Accurate plasma current measurement is essential for the control and analysis of plasma behavior in tokamak experiments. In the EXL-50U spherical torus, a synergistic measurement system combining Rogowski coils, strategically positioned 180° apart, with optical fiber current sensors has been implemented. To meet the rigorous demands of high-temperature of plasma experiments, a dedicated water-cooling system was engineered to protect and efficiently cool the optical fibers within the vacuum vessel. Calibration procedures employing a FLUKE current source were done after the installation and the two kinds of sensors show good consistency in measuring the plasma current. The research overcame significant design and installation obstacles, such as reducing eddy current interference from toroidal structures and preventing damage to the optical fibers during installation, by employing innovative engineering strategies. These advancements contribute significantly to the field of fusion energy, enhancing the accuracy and reliability of plasma diagnostics.

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EXL-50U球形环面等离子体电流测量的工程设计：集成Rogowski线圈和水冷光纤传感器

在托卡马克实验中，精确的等离子体电流测量是控制和分析等离子体行为的必要条件。在EXL-50U球形环面中，已经实现了将Rogowski线圈与光纤电流传感器相结合的协同测量系统。为了满足等离子体高温实验的严格要求，设计了专用的水冷却系统来保护和有效冷却真空容器内的光纤。安装完成后，采用FLUKE电流源进行了校准程序，两种传感器在测量等离子体电流时显示出良好的一致性。通过采用创新的工程策略，该研究克服了重大的设计和安装障碍，例如减少环形结构的涡流干扰和防止安装过程中对光纤的损坏。这些进展为聚变能领域做出了重大贡献，提高了等离子体诊断的准确性和可靠性。

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来源期刊

IEEE Transactions on Plasma Science 物理-物理：流体与等离子体

CiteScore

3.00

自引率

20.00%

发文量

538

审稿时长

3.8 months

期刊介绍： The scope covers all aspects of the theory and application of plasma science. It includes the following areas: magnetohydrodynamics; thermionics and plasma diodes; basic plasma phenomena; gaseous electronics; microwave/plasma interaction; electron, ion, and plasma sources; space plasmas; intense electron and ion beams; laser-plasma interactions; plasma diagnostics; plasma chemistry and processing; solid-state plasmas; plasma heating; plasma for controlled fusion research; high energy density plasmas; industrial/commercial applications of plasma physics; plasma waves and instabilities; and high power microwave and submillimeter wave generation.