Development of an element-selective ion-source system ofr the study of radioactive nuclei by means of the muonic X-ray spectroscopy

开发用于通过 μ 子 X 射线光谱研究放射性核的元素选择性离子源系统

• 批准号: 12440071
• 负责人: MIYATAKE Hiroari
• 金额: $ 9.79万
• 依托单位: High Energy Accelerator research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440071/
• 关键词: laser ablation; resonant ionization; ECR ion-source; radioactive nuclear beams

A proposed new ion-source system consists of the laser ion-source including the resonant ionization laser and the ablation laser, and the charge-breeding ECR ion-source. Research summaries of developments, 1) a resonant ionization of the short-lived 25Al, 2)a study of the laser ablation mechanism, and 3)a construction of the high-performance charge-breeding ECR ion-source, are followings.1)A selective ionization and successive on-line mass-separation of the short-lived nuclei25Al(T1/2=7, 2sec.) was succeeded for the first time by means of the resonant ionization technique. The resonant ionization laser was tuned with the combination of the excimer laser and dye laser. The ionization efficiency was about 0.1%.2)Velocity distributions of Nd andNd+ in the laser ablation plume was measured by the laser unduced fluorescence spectroscopy. The ablations was produced and were controlled by the YAG laser. It was found that the velocities or neutrals and ions in the 0.7 torr Ar-gas was lower than those in the vacuum circumstance by the tow orders of magnitude and one order of magnitude, respectively. This difference will be utilized for the selection of neutrals from ions. It was also found that the ablated particles were accelerated within the 20 mm from ablation point.3)On the basis of the result of the test-bench experiments and the realistic simulation of ions in ECR-plasma, a charge-breeding ECR ion-source including the newly designed deceleration system was constructed. This device will be installed in the KEK-JAERI joint radioactive nuclear beam facility for the use of heavy radioactive nuclei.

提出了一种新的离子源系统，它由包括共振电离激光和烧蚀激光的激光离子源和电荷孕育ECR离子源组成。1)短寿命25Al的共振电离，2)激光烧蚀机理的研究，3)高性能电荷孕育ECR离子源的结构。1)短寿命核25Al的选择性电离和连续在线质量分离。利用共振电离技术首次获得成功。利用准分子激光和染料激光相结合的方法实现了共振电离激光器的调谐。电离效率约为0.1%。2)用激光诱导荧光光谱仪测量了激光烧蚀羽流中Nd和Nd+的速度分布。采用激光消融的方法进行消融治疗。结果表明，0.7托气体中的速度或中性粒子和离子分别比真空环境中的速度低两个数量级和一个数量级。这一差异将被用于从离子中选择中性分子。3)在台架实验结果的基础上，通过对ECR等离子体中离子的真实感模拟，构建了一个包括减速系统在内的电荷孕育ECR离子源。该装置将安装在KEK-JAERI联合放射性核束设施中，用于重放射性核。

项目成果

H. Miyatake et al.: "Present Status of the radioactive nuclear beam facility at KEK-Tanashi and the E-arena in the KEK-JAERI joint project"Nuclear Physics. (in press)A. (2002)

H. Miyatake 等人：“KEK-Tanashi 放射性核束设施和 KEK-JAERI 联合项目中的 E 竞技场的现状”核物理。

H. Miyatake et al.: "KEK-JAERI Joint RNB Project"Proc. 4th Italy-Japan Symposium. (in press). (2002)

H. Miyatake 等人：“KEK-JAERI 联合 RNB 项目”Proc。

H.Miyatake et al.: "KEK-JAERI Joint RNB Project"Proc. 4th Italy-Japan Symp. on Heavy Ion Physics. (印刷中).

H.Miyatake 等人：“KEK-JAERI 联合 RNB 项目”第四届意大利-日本重离子物理研讨会（正在出版）。

H.Miyatake et al.: "Present Status of the radioactive nuclear beam facility at KEK-Tanashi and the E-arena in the KEK-JAERI joint project"Nuclear Physics. A. (2002)

H.Miyatake 等人：“KEK-Tanashi 放射性核束设施和 KEK-JAERI 联合项目中的 E 竞技场的现状”核物理。

M.Oyaizu et al.: "The development of a charge breeding system with ECR ion sources of permanent magnets"Rev. Sci. Instrum.. 73. 806-808 (2002)

M.Oyaizu 等人：“采用永磁体 ECR 离子源的电荷增殖系统的开发”Rev.