HL-3装置7 MW中性束传输效率研究  

Study on transmission efficiency of 7 MW neutral beam injector for HL-3 tokamak

作　　者：杨宪福 魏会领 万银祥 周博文 余珮炫 罗怀宇 周红霞 唐珮钦 耿少飞 YANG Xianfu;WEI Huiling;WAN Yinxiang;ZHOU Bowen;YU Peixuan;LUO Huaiyu;ZHOU Hongxia;TANG Peiqin;GENG Shaofei(Southwestern Institution of Physics,Chengdu 610225,China)

机构地区：[1]核工业西南物理研究院,成都610225

出　　处：《核技术》2024年第5期102-108,共7页Nuclear Techniques

基　　金：西物创新行动——7 MW中性束注入器关键技术研究(No.202201XWCX001)资助。

摘　　要：中性束注入加热是磁约束聚变实验中非常有效的辅助加热方法,已建成的5 MW中性束在中国环流三号(HL-3)托卡马克1 MA等离子体电流高约束模式放电中起到了重要的作用。为了实现HL-3装置2.5 MA的H模放电,计划建造3条中性束注入加热系统,总加热功率达到20 MW。为HL-3设计了7 MW中性束注入器,从中性化效率和束功率沉积两方面研究束传输效率。基于蒙特卡罗方法分析了两种束流参数下中性化器性能,给出了最佳中性化效率所需的气体靶厚,并以功率沉积的方法分析了两种束流的传输性能。结果表明:当中性化送气分别为0.6 Pa·m^(3)·s^(-1)和1.1 Pa·m^(3)·s^(-1)时,束流达到最佳中性化效率;当束散角为1.2°时,两种束流参数得到的中性束功率分别为7.2 MW和6.8 MW,束传输效率分别为0.4和0.35。因此,7 MW中性束离子源参数将优选100 kV/45 A,但注入器仍保留了提供120 keV氘束的能力。[Background]Neutral beam injection heating is a very effective auxiliary heating method in magnetic confinement fusion experiment.The built 5 MW neutral beam injection plays an important role in the H-mode operation with 1 MA plasma current of HL-3 tokamak.In order to achieve the H-mode operation with 2.5 MA,three neutral beam injection heating systems will be constructed with a total heating power of 20 MW.[Purpose]This study aims to investigate the transmission efficiency of 7 MW neutral beam injector designed for HL-3 tokamak.[Methods]The beam transmission efficiency was studied from two aspects of neutralization efficiency and power deposition.The initial target thickness of the neutralizer under two beam parameters was analyzed based on Monte Carlo method.The optimal neutralization efficiency was achieved by adding neutralizer gas supply,and the target thickness required for the optimal neutralization efficiency was given.Finally,power deposition method was employed to analyze the transmission performance of the two neutral beams with different parameters at different beam divergence angles.[Results]The results show that the optimal neutralizer efficiency is achieved when the neutralizer gas supply is 0.6 Pa∙m3∙s-1 and 1.1 Pa∙m3∙s-1,respectively.The neutral beam power obtained under two beam parameters with a divergence angle of 1.2°is 7.2 MW and 6.8 MW,respectively,and the corresponding transmission efficiency is 0.4 and 0.35,respectively.[Conclusions]The new neutral beam injector of HL-3 tokamak will be built according to the design of this study,with optimized parameter of 100 kV/45 A,while still retaining the ability to deliver a 120 keV deuterium beam.

关 键 词：中性束 传输效率 中性化效率 束散角 功率密度 

分 类 号：TL62[核科学技术—核技术及应用]