A feedback control of fuel recycling via real-time boron powder injection,addressing the issue of continuously increasing recycling in long-pulse plasma discharges,has been successfully developed and implemented on EA...A feedback control of fuel recycling via real-time boron powder injection,addressing the issue of continuously increasing recycling in long-pulse plasma discharges,has been successfully developed and implemented on EAST tokamak.The feedback control system includes four main parts:the impurity powder dropper(IPD),a diagnostic system measuring fuel recycling level represented by D_(α)emission,a plasma control system(PCS)implementing the Proportional Integral Derivative(PID)algorithm,and a signal converter connecting the IPD and PCS.Based on this control system,both active control and feedback control experiments have recently been performed on EAST with a full metal wall.The experimental results show that the fuel recycling can be gradually reduced to lower level as PCS control voltage increases.In the feedback control experiments,it is also observed that the D_(α)emission is reduced to the level below the target D_(α)value by adjusting boron injection flow rate,indicating successful implementation of the fuel recycling feedback control on EAST.This technique provides a new method for fuel recycling control of long pulse and high parameter plasma operations in future fusion devices.展开更多
在聚变装置真空检漏领域中,未来聚变装置涉氚运行,检漏人员无法进入装置检漏,这使得这项任务极其困难和耗时。为实现聚变装置泄漏设备的快速准确检测,本文以6自由度机械臂为研究对象,提出了一种GV2-YOLOv5的真空设备检测方法用于真空检...在聚变装置真空检漏领域中,未来聚变装置涉氚运行,检漏人员无法进入装置检漏,这使得这项任务极其困难和耗时。为实现聚变装置泄漏设备的快速准确检测,本文以6自由度机械臂为研究对象,提出了一种GV2-YOLOv5的真空设备检测方法用于真空检漏机器人对真空设备进行识别和定位喷氦。在该方法中,结合轻量级Ghost Net V2网络构建C3GhostV2模块,同时使用轻量的Ghost卷积提取目标特征,从而降低模型参数量,提高计算速度;在特征融合网络中添加Bottleneck Transformers和ECA注意力机制,提高网络特征提取能力以及加强模型通道特征。实验结果表明,在自制数据集上,改进后的模型平均精度为93.2%,相比YOLOv5s提高了1.4%,模型参数量减少了29.5%,检测速度为92 fps,满足实时性与准确性的需求,为真空检漏机器人目标识别与定位提供了一种的解决方案。展开更多
First lithium coating associated with ion cyclotron range of frequency （ICRF） plasma was performed successfully in EAST. Results in reduction of both residual impurity and deuterium in the vacuum vessel were obtaine...First lithium coating associated with ion cyclotron range of frequency （ICRF） plasma was performed successfully in EAST. Results in reduction of both residual impurity and deuterium in the vacuum vessel were obtained. Particularly the partial pressure of deuterium after the lithium coating was reduced by about a factor of 5. Impurity radiation in the plasma was reduced and electron temperature increased by about 50%. Moreover, reproducible plasma discharges with high parameters, such as higher plasma current and density, could be easily obtained. These results showed that plasma performance was improved. Even though only 2 g of lithium were injected, the effective lifetime of the Li film was raised up to 40 shots.展开更多
基金funded by the National Key Research and Development Program of China(Nos.2022YFE03130000 and 2022YFE03130003)National Natural Science Foundation of China(Nos.12205336 and 12475208)+2 种基金The Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB0790102)the Provincial Natural Science Foundation of Anhui(No.2408085J002)Interdisciplinary and Collaborative Teams of CAS。
文摘A feedback control of fuel recycling via real-time boron powder injection,addressing the issue of continuously increasing recycling in long-pulse plasma discharges,has been successfully developed and implemented on EAST tokamak.The feedback control system includes four main parts:the impurity powder dropper(IPD),a diagnostic system measuring fuel recycling level represented by D_(α)emission,a plasma control system(PCS)implementing the Proportional Integral Derivative(PID)algorithm,and a signal converter connecting the IPD and PCS.Based on this control system,both active control and feedback control experiments have recently been performed on EAST with a full metal wall.The experimental results show that the fuel recycling can be gradually reduced to lower level as PCS control voltage increases.In the feedback control experiments,it is also observed that the D_(α)emission is reduced to the level below the target D_(α)value by adjusting boron injection flow rate,indicating successful implementation of the fuel recycling feedback control on EAST.This technique provides a new method for fuel recycling control of long pulse and high parameter plasma operations in future fusion devices.
文摘在聚变装置真空检漏领域中,未来聚变装置涉氚运行,检漏人员无法进入装置检漏,这使得这项任务极其困难和耗时。为实现聚变装置泄漏设备的快速准确检测,本文以6自由度机械臂为研究对象,提出了一种GV2-YOLOv5的真空设备检测方法用于真空检漏机器人对真空设备进行识别和定位喷氦。在该方法中,结合轻量级Ghost Net V2网络构建C3GhostV2模块,同时使用轻量的Ghost卷积提取目标特征,从而降低模型参数量,提高计算速度;在特征融合网络中添加Bottleneck Transformers和ECA注意力机制,提高网络特征提取能力以及加强模型通道特征。实验结果表明,在自制数据集上,改进后的模型平均精度为93.2%,相比YOLOv5s提高了1.4%,模型参数量减少了29.5%,检测速度为92 fps,满足实时性与准确性的需求,为真空检漏机器人目标识别与定位提供了一种的解决方案。
基金support by National Natural Science Foundation of China (No.10705030)
文摘First lithium coating associated with ion cyclotron range of frequency （ICRF） plasma was performed successfully in EAST. Results in reduction of both residual impurity and deuterium in the vacuum vessel were obtained. Particularly the partial pressure of deuterium after the lithium coating was reduced by about a factor of 5. Impurity radiation in the plasma was reduced and electron temperature increased by about 50%. Moreover, reproducible plasma discharges with high parameters, such as higher plasma current and density, could be easily obtained. These results showed that plasma performance was improved. Even though only 2 g of lithium were injected, the effective lifetime of the Li film was raised up to 40 shots.
