A new 14.5 GHz Electron Cyclotron Resonance (ECR) ion source has been constructed over the last two years. The source was designed and tested by making use of the latest results from ECR ion source development, such a...A new 14.5 GHz Electron Cyclotron Resonance (ECR) ion source has been constructed over the last two years. The source was designed and tested by making use of the latest results from ECR ion source development, such as high mirror magnetic field, large plasma volume, and biased probe. 140uA of O^7+, 185uA of Ar^11+ and 50uA of Xe^26+ could be produced with a RF power of 800 W. The intense beams of highly charged metallic ions are produced by means of the method of a metal evaporation oven and volatile compound through axial access. The test results are 130uA of Ca^11+, 70uA of Ca^12+ and 65uA of Fe^lo+. The ion source has been put into operation for the cyclotron at the institute of Modern Physics (IMP).展开更多
为满足兰州重离子加速器的实验要求,先后在中国科学院近代物理研究所14.5GHz(LECR2)及10GHz+14.5GHz(LECR3)高电荷态ECR离子源上使用MIVOC(Metallic ion fromvolatile compounds)方法进行了高电荷态金属离子产生的实验研究。主要研究了...为满足兰州重离子加速器的实验要求,先后在中国科学院近代物理研究所14.5GHz(LECR2)及10GHz+14.5GHz(LECR3)高电荷态ECR离子源上使用MIVOC(Metallic ion fromvolatile compounds)方法进行了高电荷态金属离子产生的实验研究。主要研究了铁和镍的各种高电荷态离子的产生,具有代表性的是210eμA的Fe11+、175eμA的Fe12+、142eμA的Fe13+、25eμA的Fe16+、64eμA的Ni10+、57eμA的Ni13+、31eμA的Ni15+和15eμA的Ni16+。本文将分别给出两种金属离子产生的多电荷态束流谱图,并对实验装置的安排、实验现象及结果进行讨论与总结。展开更多
A radial sputter probe has been developed for the AECR-U as an additional method of producing metal ion beams.Negative voltage is applied to the probe to incite collisions with target atoms,thereby sputtering material...A radial sputter probe has been developed for the AECR-U as an additional method of producing metal ion beams.Negative voltage is applied to the probe to incite collisions with target atoms,thereby sputtering material into the plasma.The sputter probe is positioned through one of the 6 radial access slots between the permanent hexapole structure of the AECR-U.The probe position can be varied with respect to the inner edge of the hexapole magnet structure.Charge state distributions and peak beam intensities at bias voltages up to-5kV were obtained for gold samples at varying distances of the probe with respect to the plasma.For high charge states production the radial position with respect to the plasma was more sensitive than for the medium and lower charge states.For high charge state ion production the probe was optimized at a distance of 0.6cm inside the chamber wall(4.1cm from the center of the chamber).Stable beams with peak intensities of up to 28eμA of Au^(24+) and 1.42eμA of Au^(41+) have been produced using the sputter probe technique. In addition,a solid state circuit under development by Scientific Solutions,Inc which provides a bandwidth up to 100MHz was used to drive the 14GHz klystron amplifier for the LBNL AECR-U ion source.Various broadband and discrete heating modes were tested and the results for high charge state ion production were compared with single frequency heating.展开更多
高电荷态电子回旋共振(Electron Cyclotron Resonance,ECR)离子源产生金属离子束的方法有炉子加热法、溅射法、MIVOC(Metallic Ion from Volatile Compounds)等,其中炉子加热法具有产生的束流强度高、稳定性好的特点。炉子加热法的技术...高电荷态电子回旋共振(Electron Cyclotron Resonance,ECR)离子源产生金属离子束的方法有炉子加热法、溅射法、MIVOC(Metallic Ion from Volatile Compounds)等,其中炉子加热法具有产生的束流强度高、稳定性好的特点。炉子加热法的技术核心是加热炉,按其工作温区主要分为低温炉、高温炉两大类。高温炉主要针对熔点1 500°C以上的金属钴、钛、钒、铂、铀等。通过ANSYS仿真模拟分析了高温炉钽坩埚的温度分布、高温下因膨胀所受热应力及其在ECR离子源工作环境的强磁场中所受的安培力作用。根据模拟分析结果研制了电阻式加热高温炉,并对其进行了离线测试,实验中钽坩埚在1 800°C以上发生的形变与ANSYS模拟结果相符,并根据模拟分析给出了改进方案。改进后的电阻式加热高温炉离线测试能在1 500°C稳定维持48 h以上,而在1 846°C时可稳定维持达6 h以上,结果表明:研制的电阻式加热高温炉可应用于ECR离子源产生强流高电荷态难熔金属离子束。展开更多
基金Equipment Upgrading Fund and '9.5' Fund for Fundamental Research from the Chinese Academy of Sciences
文摘A new 14.5 GHz Electron Cyclotron Resonance (ECR) ion source has been constructed over the last two years. The source was designed and tested by making use of the latest results from ECR ion source development, such as high mirror magnetic field, large plasma volume, and biased probe. 140uA of O^7+, 185uA of Ar^11+ and 50uA of Xe^26+ could be produced with a RF power of 800 W. The intense beams of highly charged metallic ions are produced by means of the method of a metal evaporation oven and volatile compound through axial access. The test results are 130uA of Ca^11+, 70uA of Ca^12+ and 65uA of Fe^lo+. The ion source has been put into operation for the cyclotron at the institute of Modern Physics (IMP).
文摘为满足兰州重离子加速器的实验要求,先后在中国科学院近代物理研究所14.5GHz(LECR2)及10GHz+14.5GHz(LECR3)高电荷态ECR离子源上使用MIVOC(Metallic ion fromvolatile compounds)方法进行了高电荷态金属离子产生的实验研究。主要研究了铁和镍的各种高电荷态离子的产生,具有代表性的是210eμA的Fe11+、175eμA的Fe12+、142eμA的Fe13+、25eμA的Fe16+、64eμA的Ni10+、57eμA的Ni13+、31eμA的Ni15+和15eμA的Ni16+。本文将分别给出两种金属离子产生的多电荷态束流谱图,并对实验装置的安排、实验现象及结果进行讨论与总结。
基金Supported by the Director,Office of Energy Research,Office of High Energy and Nuclear Physics,Nuclear Physics Division of the U.S.Department of Energy under Contract DE AC03-76SF00098
文摘A radial sputter probe has been developed for the AECR-U as an additional method of producing metal ion beams.Negative voltage is applied to the probe to incite collisions with target atoms,thereby sputtering material into the plasma.The sputter probe is positioned through one of the 6 radial access slots between the permanent hexapole structure of the AECR-U.The probe position can be varied with respect to the inner edge of the hexapole magnet structure.Charge state distributions and peak beam intensities at bias voltages up to-5kV were obtained for gold samples at varying distances of the probe with respect to the plasma.For high charge states production the radial position with respect to the plasma was more sensitive than for the medium and lower charge states.For high charge state ion production the probe was optimized at a distance of 0.6cm inside the chamber wall(4.1cm from the center of the chamber).Stable beams with peak intensities of up to 28eμA of Au^(24+) and 1.42eμA of Au^(41+) have been produced using the sputter probe technique. In addition,a solid state circuit under development by Scientific Solutions,Inc which provides a bandwidth up to 100MHz was used to drive the 14GHz klystron amplifier for the LBNL AECR-U ion source.Various broadband and discrete heating modes were tested and the results for high charge state ion production were compared with single frequency heating.
