HL-3装置二号中性束注入束线量热靶研制

Development of the calorimetry target on second neutral beam injection beam line of HL-3 device

在托克马克装置的中性束注入器中,量热靶是非常重要的水冷部件之一,承担着接收和测量束功率的任务。除此之外,利用内置热电偶阵列的方式,可以实时监测靶板不同位置的温升情况,进而获得引出离子束或中性束的功率密度分布。在HL-3装置二号中性束注入束线上,为量热靶设计了一种利用直线推杆机构实现升降,并采用“W”字型靶板结构实现中性束能量的吸收。此外,利用Ansys Workbench的流体计算模块对量热靶在满功率运行状态下的温度分布做了模拟计算,结果显示:量热靶的设计满足二号中性束注入束线的120 kV/40 A/5 s满功率运行的使用要求。可为量热靶进一步的工程设计提供设计参考。

[Background]In neutral beam injectors(NBIs)of Tokamak device,the calorimetric target is one of the most important water-cooled components,responsible for receiving and measuring beam power.In addition,by using a built-in thermocouple array,the temperature rise at different positions of the target plate can be monitored in real-time,thereby obtaining the power density distribution of the extracted ion beam or neutral beam.[Purpose]This study aims to develop a calorimetric target for the neutral beam injector in the HL-3 device,which can meet the requirements of target plate lifting and thermal load absorption.[Methods]A linear push rod mechanism was applied to the design of the calorimetry target to achieve lifting and lowering,and a"W"-shaped target plate structure was adopted to achieve absorption of neutral beam energy.According to the design parameters,the fluid calculation module of Ansys Workbench was employed to simulate the temperature distribution of the calorimetry target under full power operation.[Results]Calculation results show that the maximum temperature rise of the calorimetry target is 526.4ºC when the deflecting magnet is opened under full power operating conditions,and the temperature can be lowered to room temperature within 30 s,satisfying the requirements for the use of the beam line.[Conclusions]The successfully developed calorimetric target of this study meets application requirements on second neutral beam injection beamline of HL-3 device,providing references for further engineering design of calorimetric targets in other NBIs.