The reporter learned from the Hefei Institute of Physics of the Chinese Academy of Sciences that the research group of Sun Youwen, a member of the Institute of Plasma Physics of the Institute of Plasma Physics (EAST), used the three-dimensional rotating magnetic disturbance field to control the heat of the divertor target. New progress has been made in the area of ​​load research. The relevant results were recently published in the fusion field journal "Nuclear Fusion". Working with the research team of U.S. General Atomic Energy, the research group further extended this result to the US-based DIII-D device to study the magnetic perturbation field in the rotating and mixed perturbation mode. The related results were published in the "Plasma Physics". And was invited by the 59th American Physics Society Plasma Conference to make an invitation report.
Divertor target heat load control is a huge challenge for future magnetic confinement fusion reactors such as ITER (International Thermonuclear Fusion Reactor Project). The external magnetic disturbance field has been proved to weaken or suppress the boundary local mode, so as to effectively relieve the impact of the boundary local mode transient strong heat load on the divertor target plate. At the same time, how to reduce the cumulative effect of circular asymmetric local thermal fluxes caused by three-dimensional fields is still an unsolved problem in this research field.
The research group carried out the boundary local model control experiment on EAST by using the magnetic field with external rotation of the ring rotation. It was found that the particle flow distribution on the target plate during the magnetic perturbation appeared a circular asymmetric split structure. This structure is synchronous with the rotation of the magnetic disturbance field along the circumferential direction of the target plate, confirming the effectiveness of this control method. Through the magnetic perturbation pattern scan, it was found that the local particle flow distribution of the split structure can also be moved in a larger range along the target ring direction while maintaining the suppression effect. These experimental results show that the time-varying perturbation field is beneficial to the homogenization of particle flow and heat flow over the entire target plate, avoiding local overheating of the target plate.
Based on this result, the research team collaborated with the research team of DIII-D in the United States to further develop a control experiment for the low-impact-rate down-mixed-circular-modulus n-rotation magnetic perturbation field on the DIII-D device. Experiments show that while the static disturbance component is used to maintain the local mode suppression of the boundary, the rotation component is used to successfully achieve the homogenization control of the heat flow and particle flow on the target plate. These research results will play an important role in the development of the relevant technology and physical understanding of the transient thermal load of the target plate controlled by the three-dimensional magnetic disturbance in the magnetic confinement fusion device. (Reporter Wu Changfeng)
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