The Sino-US trade war has not affected the cooperation between Chinese and American scientists in nuclear fusion research. Physicists from both countries published a paper in the journal Physical Review Letters, and the report solved a major problem. The Chinese superconducting tokamak device (EAST) team reported that in the tokamak nuclear fusion experimental device, the boundary region of the highly confined plasma periodically bursts out a type of boundary local area mode (ELM). stability. A large-scale ELM is similar to a solar flare burst, causing instantaneous release of plasma energy and particles, ejecting powerful thermal pulses, eroding the inner wall of the device, and even causing the melting of the material, and generating a large number of foreign particles to contaminate the core of the fusion reactor, making Fusion reactors are difficult to operate in a steady state for a long time. In the future fusion reactor, the transient thermal load caused by ELM needs to be reduced by at least 20 times. This is a serious challenge facing the international magnetic confinement fusion world, especially the international thermonuclear fusion experimental reactor ITER. Exploring the lack of ELM or the small The high-constrained operating mode of amplitude ELM and its physical mechanism are a major scientific frontier issue in the research of magnetic confinement fusion. They developed a high-performance steady-state plasma operating mode, and systematically verified its compatibility with several operating conditions of future fusion reactors. Research leader Xu Guosheng said that scientists from the two countries have worked closely for many years and even played football together. The trade war had no effect. Figure 1. Experimental demonstration of the high-performance steady-state row mode accompanying Grassy ELM on EAST Figure 2. Nonlinear simulation of the BOUT ++ program contrasts the dynamic characteristics of the abutment of conventional large-scale ELM and Grassy ELM, revealing that the movement of the instability boundary of the stripping balloon mode during the evolution of the abutment distribution is the inherent dynamic mechanism of the formation of Grassy ELM. .
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