用于同位素电磁分离系统的强流离子源设计  

Design of a high current ion source for an electromagnetic isotope separator

作　　者：武启[1,2] 刘玉国 刘建立 孙良亭[1,2] 赵红卫[1,2] WU Qi;LIU Yuguo;LIU Jianli;SUN Liangting;ZHAO Hongwei(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Sciences and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049

出　　处：《核技术》2023年第3期19-26,共8页Nuclear Techniques

基　　金：国家重点研发计划项目(No.2016YFA0302202);国家杰出青年科学基金(No.12025506)资助。

摘　　要：随着我国核科学与核技术的发展,高丰度同位素的产量无法满足市场需求,极大地限制了相关领域的发展。因此,迫切需要发展高产额、高效率的电磁同位素分离装置。离子源作为电磁同位素分离器中的关键部分,其性能直接影响目标同位素的分离与产额。设计了一台2.45 GHz微波驱动的离子源用于稳定同位素电磁分离器的注入,目标是在引出能量40 keV下产生20 emA Xe^(+)及5 emA Mo^(+)。为了获得高密度等离子体,设计了双线包螺线管产生放电磁场,并通过仿真软件CST微波模块计算优化了高耦合效率的磁场位型和匹配波导。为了产生强流金属离子束,设计了内置放电室坩埚熔化金属氧化物。模拟结果表明:当加热丝电流为70 A时,坩埚温度最高为917℃,可以高效地产生金属钼蒸气,进入放电室进行离化。[Background]Stable isotopes play a crucial role in a variety of fields such as energy,military,semiconductor,agriculture,medicine,pharmacology,biology,food industry,and chemistry.With the rapid growth of nuclear science and technology applications in China,there has been an increasing demand for isotopes that cannot be met by current production capacities.Thus,the development of electromagnetic isotope separators capable of producing high yields and high isotopic purity has become necessary.[Purpose]This study aims to develop an electromagnetic isotope separator based on a 2.45 GHz microwave ion source and isotopic magnet for studying a number of important heavy isotopes,such as xenon and molybdenum isotopes.[Methods]Firstly,adjustable axial magnetic field in the source was designed by a double-solenoids to obtain high density plasma,and a high coupling efficiency matching waveguide was optimized by CST microwave computing module.Then.a crucible built in the discharge chamber was used to melt metal oxide for generating heavy metal ion beams.Finally,the discharge chamber,microwave coupling waveguides and heating oven of the ion source were simulated and designed for the generation of heavy ions.[Results]Simulation result shows that the temperature around the crucible is 917℃when the current of heating wire is set to 70 A,and 100 mA hydrogen beam is generated during commissioning.The designed crucible in the discharge chamber can generate metal vapor efficiently for ionization,and achieve producing 20 emA Xe^(+)and 5 emA Mo^(+)respectively at the energy of 40 keV.[Conclusions]The feasible scheme of the magnetic field and microwave coupling design of this study are verified.The design of the 2.45 GHz electron cyclotron resonance(ECR)ion source provides a feasible and effective solution for the high yields isotope ions.

关 键 词：电磁分离器 同位素 强流重离子束流 2.45 GHz微波离子源 

分 类 号：TL501.5[核科学技术—核技术及应用]