Recently, researchers from the Low Clutter Research Group of the Institute of Plasma Physics, Hefei Academy of Material Sciences, Chinese Academy of Sciences have made new progress in improving high-density and low-clutter current driving capabilities. The field journal Nuclear Fusion [Nucl. Fusion 58 (2018) 095003; Nucl. Fusion 58 (2018) 126015].
The abnormal reduction of low clutter current drive efficiency at high density is a challenge faced by the low clutter current drive research field, and also a key factor restricting its application in ITER and future reactors. In order to explore the application of low clutter in future fusion reactors, in recent years, researchers in the research group have conducted research on two sets of high-power low-clutter systems with different frequencies on EAST. The results show that [Nucl. Fusion 58 (2018) 095003]: The edge plasma parameters and low clutter frequency are important factors that affect the driving of low clutter current. By increasing the frequency of the wave source, reducing the boundary reflow and increasing the boundary electron temperature, the low Clutter parametric decay behavior and reduce the collisional absorption of wave power at the edge, thereby improving the driving ability of low clutter current at high density. Further research shows that [Nucl. Fusion 58 (2018) 126015]: The difference in driving ability of low-frequency clutter current at different frequencies increases with the increase of plasma density (Table 1), and the difference between parametric decay behavior and the change of plasma density Consistent (Figure 1), further proving the effect of parametric decay on low clutter current drive; the correlation between plasma edge current distribution and low clutter parametric decay was first observed experimentally (Figure 1, 2) (parameter Strong decay, large edge drive current share: the wavelet generated by the parametric decay process has a high parallel refractive index (N //), deposited in a relatively outer area, resulting in a relatively high edge current), improving the edge for low clutter Current distribution and improved plasma confinement provide a possible new method; the nonlinear simulation results (Figure 3) show that as the density increases, the parametric decay-driven mode growth rate increases, but the 4.6 GHz growth rate is significantly less than 2.45 GHz , Qualitatively explained the experimental results.
The above work was supported by the plasma system, and also benefited from the cooperation of international peers, especially the joint research of Italian ENEA, French CEA and American MIT collaborators, and obtained national key research and development projects, national magnetic confinement nuclear Funded by the Fusion Energy Development Research Project, the National Natural Science Foundation of China, the "High-end User Cultivation Fund" of the Hefei University Science Center of the Chinese Academy of Sciences, and Wang Kuancheng Education Fund.
Table 1. The difference of ring voltage and fast electron radiation corresponding to two frequencies under different density conditions 
Figure 1. Decay measurement of two low frequency clutter parameters under different density conditions
Figure 2. Effect of wave source frequency (a) and plasma density (b) on the boundary current distribution
Figure 3. Calculated results of the model growth rate spectrum at different boundary densities (left: 4.6 GHz, right: 2.45 GHz)
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