Radioactive ion beam line in Lanzhou (RIBLL) has been constructed for the production of short-lived radioactive nuclei and studies of exotic nuclei far from the β-stability line. It has been put into operation recent...Radioactive ion beam line in Lanzhou (RIBLL) has been constructed for the production of short-lived radioactive nuclei and studies of exotic nuclei far from the β-stability line. It has been put into operation recently at the National Laboratory of Heavy Ion Accelerator Lanzhou. RIBLL consists of two doubly achromatic parts with a solid acceptance ΔΩ?6.5 msr, momentum acceptance Δp/p=±5% and maximum magnetic rigidityBp max=4.2 Tm. The second part of RIBLL serving as a spectrometer gives an element resolutionZ/ΔZ>150 and mass resolutionA/ΔA>300. The polarized secondary beams can be obtained by using a swinger dipole magnet to change the incident direction of primary projectile from 0° to 5°. The shortest lift time for secondary beams on RIBLL is less than 1 μs. First experiments were performed with neutron rich nuclei for understanding the properties of halo nuclei and exotic nuclear reactions.展开更多
Charge state distribution of 0.8MeV/u uranium ions after transmission through a thin carbon foil has been studied. It is observed that the charge state distribution is equilibrated after the uranium ions have passed t...Charge state distribution of 0.8MeV/u uranium ions after transmission through a thin carbon foil has been studied. It is observed that the charge state distribution is equilibrated after the uranium ions have passed through a 15μg/cm^2 carbon foil. The equilibrated average charge state is 33.72 and the charge equilibration time of uranium ions in carbon foil is less than 5.4fs.展开更多
Korea plans to build a new radioactive ion-beam accelerator RAON together with various experimental facilities. In particular, KOBRA(the Korea Broad Acceptance Recoil Spectrometer & Apparatus) and LAMPS(the Large-...Korea plans to build a new radioactive ion-beam accelerator RAON together with various experimental facilities. In particular, KOBRA(the Korea Broad Acceptance Recoil Spectrometer & Apparatus) and LAMPS(the Large-Acceptance Multi-Purpose Spectrometer) will be constructed for the nuclear physics experiments.The primary goal of KOBRA is to study the structure of exotic nuclei near drip lines and various astrophysical processes at low energies. On the other hand, LAMPS will investigate the density dependence of the nuclear symmetry energy in wide beam energy range up to 2 times normal nuclear densities. This paper provides an overview of RAON and the experimental setup for the nuclear physics program.展开更多
兰州重离子加速器放射性次级束分离线一号线(Heavy Ion Research Facility in Lanzhou-Radioactive Ion Beam Line 1,HIRFL-RIBLL1)已运行多年,其电源控制系统因建设初期条件所限设计较为简单,加之近年来系统部件老化,已不能很好满足物...兰州重离子加速器放射性次级束分离线一号线(Heavy Ion Research Facility in Lanzhou-Radioactive Ion Beam Line 1,HIRFL-RIBLL1)已运行多年,其电源控制系统因建设初期条件所限设计较为简单,加之近年来系统部件老化,已不能很好满足物理实验要求,迫切需要进行升级改造。新的电源控制系统针对现有问题,采用分布式架构,每台电源用一台高精度控制器就近控制。同时集成了二极磁铁磁场强度和所有电源输出电流的监控,并且利用滞环控制策略,实现了根据预设磁刚度自动调试电源的功能。新电源控制系统经过一年多来的几次实验调束验证,在调试精度、抗干扰性、易用性等方面满足了RIBLL1物理需求,大幅度提高了调束效率。展开更多
基金Project supported by the Chinese Academy of Sciencesthe State Science and Technology Commission of Chinathe National Natural Science Foundation of China (Grant No. 19675055)
文摘Radioactive ion beam line in Lanzhou (RIBLL) has been constructed for the production of short-lived radioactive nuclei and studies of exotic nuclei far from the β-stability line. It has been put into operation recently at the National Laboratory of Heavy Ion Accelerator Lanzhou. RIBLL consists of two doubly achromatic parts with a solid acceptance ΔΩ?6.5 msr, momentum acceptance Δp/p=±5% and maximum magnetic rigidityBp max=4.2 Tm. The second part of RIBLL serving as a spectrometer gives an element resolutionZ/ΔZ>150 and mass resolutionA/ΔA>300. The polarized secondary beams can be obtained by using a swinger dipole magnet to change the incident direction of primary projectile from 0° to 5°. The shortest lift time for secondary beams on RIBLL is less than 1 μs. First experiments were performed with neutron rich nuclei for understanding the properties of halo nuclei and exotic nuclear reactions.
基金Project supported by the National Natural Science Foundation of China (Grant No 10405025)
文摘Charge state distribution of 0.8MeV/u uranium ions after transmission through a thin carbon foil has been studied. It is observed that the charge state distribution is equilibrated after the uranium ions have passed through a 15μg/cm^2 carbon foil. The equilibrated average charge state is 33.72 and the charge equilibration time of uranium ions in carbon foil is less than 5.4fs.
基金Supported by the National Research Foundation of Korea(Nos.2012M7A1A2055596 and 2013M7A1A1075898)
文摘Korea plans to build a new radioactive ion-beam accelerator RAON together with various experimental facilities. In particular, KOBRA(the Korea Broad Acceptance Recoil Spectrometer & Apparatus) and LAMPS(the Large-Acceptance Multi-Purpose Spectrometer) will be constructed for the nuclear physics experiments.The primary goal of KOBRA is to study the structure of exotic nuclei near drip lines and various astrophysical processes at low energies. On the other hand, LAMPS will investigate the density dependence of the nuclear symmetry energy in wide beam energy range up to 2 times normal nuclear densities. This paper provides an overview of RAON and the experimental setup for the nuclear physics program.
文摘兰州重离子加速器放射性次级束分离线一号线(Heavy Ion Research Facility in Lanzhou-Radioactive Ion Beam Line 1,HIRFL-RIBLL1)已运行多年,其电源控制系统因建设初期条件所限设计较为简单,加之近年来系统部件老化,已不能很好满足物理实验要求,迫切需要进行升级改造。新的电源控制系统针对现有问题,采用分布式架构,每台电源用一台高精度控制器就近控制。同时集成了二极磁铁磁场强度和所有电源输出电流的监控,并且利用滞环控制策略,实现了根据预设磁刚度自动调试电源的功能。新电源控制系统经过一年多来的几次实验调束验证,在调试精度、抗干扰性、易用性等方面满足了RIBLL1物理需求,大幅度提高了调束效率。
