Recently, Hu Jiansheng, a researcher of the Tokamak Physics Laboratory of the Institute of Plasma Physics, Hefei Academy of Material Sciences, Chinese Academy of Sciences, has made new progress in the research of uniform flow liquid lithium limiters. An improved flowing liquid lithium limiter with increased flow uniformity in high power plasmas in EAST was published in the journal Nuclear Fusion in the field of nuclear fusion.
The flowing liquid lithium wall can withstand a higher surface heat load and has the ability to repair itself, which is increasingly valued by the fusion community. In recent years, based on the first round of liquid lithium experiment in 2014 (a generation of liquid lithium limiter), researchers in the research group have further studied the control and mechanism of hydrogen on the lithium wall (GZ Zuo, et al., Fusion Eng. Des . 131 (2018) 41) and the breakthrough in improving the wettability and interfacial interaction of liquid lithium on 316L stainless steel substrate materials (GZ Zuo, et al., Fusion Eng. Des. 137 (2018) 420). On this basis, by optimizing the structure of the flowing liquid lithium limiter, including the use of a built-in dual electromagnetic pump, a uniformly distributed distribution box structure, a capillary structure on the surface of the guide plate, etc., the uniform flow of the lithium surface is promoted, and hot isostatic pressure is used The process achieves a good fit between the surface stainless steel and copper heat sink, and improves the corrosion resistance of the surface. The experimental results show that the spreading area of ​​liquid lithium on the surface of 316L stainless steel is> 80%, there is no obvious damage to the substrate surface, and the cooling of liquid lithium by high-pressure helium gas is achieved. In ohmic discharge, the cooling efficiency is about 55%. Can be recycled. At the same time, the experiment also found that with the increase of lithium flow rate, the level of recirculation and iron impurities gradually decreased, and the plasma behavior increased. Under the condition of heating power reaching 4.5MW, a large amount of lithium explosion was not observed, and further confirmed the flow The mitigation effect of liquid lithium on the boundary local mode (ELM). As the discharge of liquid lithium continues, ELM gradually eases or suppresses, along with the improvement of plasma confinement. The control of recycling is closely related. This study expands the feasibility of the application of flowing liquid lithium as the first wall component in the high thermal load zone of future fusion devices.
The above work was supported by the relevant scientific researchers of the Institute of Plasma, and also benefited from the cooperation of international peers. It was supported by national key research and development projects, the national magnetic confinement fusion energy development research project, and the National Natural Science Foundation of China.
Figure 1 Schematic diagram of the second generation flowing liquid lithium limiter
Figure 2 The relationship between the flow rate of lithium and the current of the electromagnetic pump under the conditions of dual electromagnetic pump (a) and single electromagnetic pump (b)
Figure 3 ELM behavior changes under the condition of flowing liquid lithium wall: ELM gradually eases as the discharge continues (a), the frequency and amplitude of ELM (b)
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