EAST 上锂粉流量动态注入对燃料再循环影响研究

The control of fuel particle recycling during plasma discharges in magnetic confinement fusion devices is crucial for the steady operation of long-pulse. In order to explore the control effect of lithium powder injection at different flow rates on fuel recycling, the lithium powder control system was upgraded to allow for real-time, active adjustment of lithium powder flow rates during single plasma discharge. Tabletop test results showed a linear relationship between lithium powder flow rate and control voltage. Based on this, experiments were conducted at EAST to dynamically vary the lithium powder flow rate during a plasma discharge to control fuel recycling. The results demonstrated that the new lithium powder control system can dynamically adjust the lithium powder injection rate in real time during a plasma discharge. Moreover, increasing the lithium powder flow rate further reduced the neutral gas pressure and the D_α emission intensity in the divertor region. This confirmed that increasing the lithium powder injection rate can enhance the control of fuel recycling. This study provides support for future feedback control experiments on fuel recycling during long-pulse, high-performance plasma discharges at EAST.