研制了一台体积和重量都较大、设计性能较高的全永磁电子回旋共振(Electron cyclotron resonance, ECR)离子源LAPECR2(Lanzhou all permanent magnetic ECR ion source No．2)。该离子源将用于中国科学院近代物理研究所320 kV高压平台,...研制了一台体积和重量都较大、设计性能较高的全永磁电子回旋共振(Electron cyclotron resonance, ECR)离子源LAPECR2(Lanzhou all permanent magnetic ECR ion source No．2)。该离子源将用于中国科学院近代物理研究所320 kV高压平台,为其提供强流高电荷态离子束流。LAPECR2的研制采用全新的全永磁磁体结构设计,通过采用高性能的NdFeB永磁材料、优化的磁结构设计以及精确的计算,实测源体的磁场参数能达到高性能ECR离子源的设计要求。离子源采用较高频率的14．5 GHz微波馈入加热等离子体,波导直接馈入离子源以增强馈入微波的稳定性与效率。此外,还大量采用了一些有利于提高离子源高电荷态离子产额的关键技术,如铝内衬等离子体弧腔、负偏压盘、铝制等离子体电极、三电极引出系统、辅助掺气等。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 new radioactive beam facility for ATLAS,the Californium Rare Ion Breeder Upgrade （CARIBU）, is under construction.The facility will use fission fragments from a 1 Ci <sup>252</sup>Cf source;thermalized ...A new radioactive beam facility for ATLAS,the Californium Rare Ion Breeder Upgrade （CARIBU）, is under construction.The facility will use fission fragments from a 1 Ci <sup>252</sup>Cf source;thermalized and collected into a low-energy beam by a helium gas catcher.In order to reaccelerate these beams,the existing ATLAS ECR-I ion source is being redesigned to function as a charge breeder source.The design and features of this charge breeder configuration is discussed and the project status described.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<sup>24+</sup> and 1.42eμA of Au<sup>41+</sup> 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
ECRIS’s dedicated to radioactive ion production must be as efficient as those used for production of stable elements,but in addition they are subject to more specific constraints such as radiation hardness, short ato...ECRIS’s dedicated to radioactive ion production must be as efficient as those used for production of stable elements,but in addition they are subject to more specific constraints such as radiation hardness, short atom-to-ion transformation time,beam purity and low cost.Up to now,different target/ion-source systems(TISSs)have been designed,using singly-charged ECRISs,multi-charged ion sources or an association of singly-to-multi-charged ECRISs.The main goals,constraints and advantages of different existing ECR setups will be compared before a more detailed description is given of the one designed for the SPIRALⅡproject and its future improvements.展开更多
文摘研制了一台体积和重量都较大、设计性能较高的全永磁电子回旋共振(Electron cyclotron resonance, ECR)离子源LAPECR2(Lanzhou all permanent magnetic ECR ion source No．2)。该离子源将用于中国科学院近代物理研究所320 kV高压平台,为其提供强流高电荷态离子束流。LAPECR2的研制采用全新的全永磁磁体结构设计,通过采用高性能的NdFeB永磁材料、优化的磁结构设计以及精确的计算,实测源体的磁场参数能达到高性能ECR离子源的设计要求。离子源采用较高频率的14．5 GHz微波馈入加热等离子体,波导直接馈入离子源以增强馈入微波的稳定性与效率。此外,还大量采用了一些有利于提高离子源高电荷态离子产额的关键技术,如铝内衬等离子体弧腔、负偏压盘、铝制等离子体电极、三电极引出系统、辅助掺气等。
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 U.S.Department of Energy,Office of Nuclear Physics,under contract W-31-109-ENG-38
文摘A new radioactive beam facility for ATLAS,the Californium Rare Ion Breeder Upgrade （CARIBU）, is under construction.The facility will use fission fragments from a 1 Ci <sup>252</sup>Cf source;thermalized and collected into a low-energy beam by a helium gas catcher.In order to reaccelerate these beams,the existing ATLAS ECR-I ion source is being redesigned to function as a charge breeder source.The design and features of this charge breeder configuration is discussed and the project status described.
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<sup>24+</sup> and 1.42eμA of Au<sup>41+</sup> 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.
文摘ECRIS’s dedicated to radioactive ion production must be as efficient as those used for production of stable elements,but in addition they are subject to more specific constraints such as radiation hardness, short atom-to-ion transformation time,beam purity and low cost.Up to now,different target/ion-source systems(TISSs)have been designed,using singly-charged ECRISs,multi-charged ion sources or an association of singly-to-multi-charged ECRISs.The main goals,constraints and advantages of different existing ECR setups will be compared before a more detailed description is given of the one designed for the SPIRALⅡproject and its future improvements.
