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Technical Improvements in the Experiment of Isochronous mass measurement of ^(58)Ni Projectile Fragments

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原子核物理评论 2016年第2期33卷 173-179页

作者：帅鹏涂小林张玉虎王猛徐星颜鑫亮陈相成 Institute of Modern Physics Chinese Academy of Sciences

The combination of in-flight fragment separator and the isochronous mass spectrometry(IMS)in storage rings have been proven to be a powerful tool for the precision mass measurements of shortlived exotic nuclei. In IMS, the mass-over-charge ratio is only related to the revolution period of stored ions, and the relative mass resolution can reach up to the order of 10-6. However, the instability of the magnetic field of storage ring deteriorates the resolution of revolution period, making it very difficult to distinguish the ions with very close mass-over-charge ratio via their revolution periods. To improve the resolution of revolution periods, a new method of weighted shift correction(WSC) has been developed to accurately correct the influence of the magnetic field instabilities in the isochronous mass measurements of ^(58)Ni projectile fragments. By using the new method, the influence of unstable magnetic fields can be greatly reduced, and the mass resolution can be improved by a factor up to 1.7. Moreover, for the ions that still cannot be distinguished after correcting the magnetic field instabilities, we developed a new method of pulse height analysis for particle identification. By analyzing the mean pulse amplitude of each ion from the timing detector, the stored ions with close mass-over-charge ratios but different charge states such as ^(34)Ar and ^(51)Co can be identified, and thus the mass of ^(51)Co can be determined. The charge-resolved IMS may be helpful in the future experiments of isochronous mass measurement even for N = Z nuclei.

关键词： nuclear mass storage ring isochronous mass spectrometry mass measurement

The Optimized Design of Aerosol mass measurement System based on Information Entropy

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The Optimized Design of Aerosol Mass Measurement System base...

Opportunities for production and property research of neutron-rich nuclei around N=126 at HIAF

2015 3rd International Conference on Machinery,Materials and Information Technology Applications(ICMMITA 2015)

作者： Juan Yang School of Electrical and Information Engineering Jinling Institute of Technology

In this paper, the relationship between the signal amplitude counting distribution’s information entropy and the channel division is analyzed firstly. According to the character of information entropy, when the channel number is given, if the channel division way is equip-probability division, then the maximum of information entropy occurs, the mass distribution information should be also the biggest. Besides, the more the channel number is divided, the bigger the information entropy. Based on these, the signal amplitude counting distribution is divided by three ways to analysis and calculation, which are equip-probability division, uniform division, geometric proportion division. The experimental results show that the aerosol mass measurement system with the equip-probability division has the highest accuracy and good stability, which matches with the theoretical analysis. This study provides a theoretical guidance for the circuit design of aerosol mass measurement system.

关键词： mass measurement information entropy channel division optimization

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cnki会议

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Nuclear Science and Techniques 2024年第6期35卷 101-113页

作者： Shao-Bo Ma Li-Na Sheng Xue-Heng Zhang Shi-Tao Wang Kai-Long Wang Chun-Wang Ma Hool-Jin Ong Zhi-Yu Sun Shu-Wen Tang Yu-Hong Yu Xin-Tong Du Xiao-Bao Wei Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000China University of Chinese Academy of Sciences Beijing 100049China College of Physics Henan Normal UniversityXinxiang 453007China Institute of Nuclear Science and Technology Henan Academy of ScienceZhengzhou 450046China Joint-Department for Nuclear Physics Lanzhou University and Institute of Modern PhysicsLanzhou 730000China Research Center for Nuclear Physics Osaka UniversityOsaka 567-0047Japan RIKEN Nishina Center Saitama 351-0198Japan Northwest Normal University Lanzhou 730070China

The study of nuclide production and its properties in the N=126 neutron-rich region is prevalent in nuclear physics and astrophysics *** upcoming High-energy FRagment Separator(HFRS)at the High-Intensity heavy-ion Accelerator Facility(HIAF),an in-flight separator at relativistic energies,is characterized by high beam intensity,large ion-optical acceptance,high magnetic rigidity,and high momentum resolution *** provides an opportunity to study the production and properties of neutron-rich nuclei around N=*** this paper,an experimental scheme is proposed to produce neutron-rich nuclei around N=126 and simultaneously measure their mass and lifetime based on the HFRS separator;the feasibility of this scheme is evaluated through *** results show that under the high-resolution optical mode,many new neutron-rich nuclei approaching the r-process abundance peak around A=195 can be produced for the first time,and many nuclei with unknown masses and lifetimes can be produced with high *** the time-of-flight corrected by the measured dispersive position and energy loss information,the cocktails produced from 208 Pb fragmentation can be unambiguously ***,the masses of some neutron-rich nuclei near N=126 can be measured with high precision using the time-of-flight magnetic rigidity *** indicates that the HIAF-HFRS facility has the potential for the production and property research of neutron-rich nuclei around N=126,which is of great significance for expanding the chart of nuclides,developing nuclear theories,and understanding the origin of heavy elements in the universe.

关键词： HFRS Fragmentation Neutron-rich nuclei around N=126 mass measurement Lifetime

A novel sensitive piezoelectric mass balance used for weightless environment

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Science China(Technological Sciences) 2021年第4期64卷 745-754页

作者： ZHANG ShiJing LIU YingXiang DENG Jie LIU JunKao School of Mechatronics and Engineering Harbin Institute of TechnologyHarbin 150001China

A novel sensitive piezoelectric mass balance(PEMB)was developed for using in weightless *** mass of the measured object was obtained by detecting the resonant frequency shift of the *** weighing method was illustrated *** order to build the relationship between the resonant frequency shift and the measured mass,the equivalent stiffness coefficient and the equivalent concentrated mass of the PEMB were analyzed *** influence of the structural and material parameters on the sensitivity was analyzed,which provided the design reference to improve the *** finite-element-method(FEM)static analysis of the PEMB was carried out with ANSYS software to investigate its shock ***,the vibration test and calibration experiment effectively verified the theoretical analyses *** developed PEMB holds merits of independence on acceleration field,independence on properties of the measured object and with shock ***,it can be a suitable candidate for measuring mass of solid samples with unknown properties in the weightless environment.

关键词： mass measurement piezoelectric mass balance resonant frequency shift weightless environment

Optimization of multi-reflection time-of-flight mass analyzer operating in in-trap-lift mode

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Radiation Detection Technology and Methods 2018年第1期2卷 1-6页

作者： Wen-Xue Huang Yu-Lin Tian Yong-Sheng Wang Jun-Ying Wang Xiao-Hong Zhou Institute of Modern Physics Chinese Academy of SciencesLanzhou730000China School of Physical Sciences University of Chinese Academy of SciencesBeijing100049China School of Nuclear Science and Technology Lanzhou UniversityLanzhou730000China

Purpose We are building an MRTOF-MS(multi-reflection time-of-flight mass spectrometer)for isobaric separation for the Lanzhou Penning *** potentials applied on the electrodes of our MRTOF mass analyzer operating in in-trap-lift mode have to be optimized to achieve a very high mass resolving *** Our method to design and optimize an MRTOF mass analyzer has been updated to introduce constraints on the potentials,and this method now can be used to optimize the parameters of MRTOF-MS both operating in mirror-switching mode and in in-trap-lift *** using this method,the optimal potential parameters of the electrodes have been obtained for our MRTOF mass analyzer operating in the in-trap-lift *** and conclusion With a beam size of 2.8 mm diameter and an initial average ion kinetic energy of 1500 eV,the maximal mass resolving power has been achieved to be 3.2×10^(4) with a total TOF of 7.0 ms for an ion species of ^(40)Ar^(1+).It can reach up to 5.6×10^(4) for a beam size of 0.3 mm *** simulation shows that the inaccuracy of the potentials applied on the outermost mirror electrodes M1–M2 must be less than 50 ppm or preferably 20 ppm.

关键词： Time-of-flight mass spectrometer Multiple reflection mass measurement Isobaric separation Exotic nuclei

SHER-HIAF ring lattice design

维普期刊数据库评论

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维普期刊数据库

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Chinese Physics C 2014年第4期38卷 84-87页

作者：高翔杨建成夏佳文柴伟平石健申国栋 Institute of Modern Physics Chinese Academy of Science University of Chinese Academy of Sciences

The Super Heavy Experimental Ring （SHER）, which is one of the rings of the next accelerator complex High Intensity Heavy Ion Accelerator Facility （HIAF） at IMP, has to be optimized for e-cooling. Its lattice is designed for two modes： the first is the isochronous mode, which is a time-of-flight mass spectrometer for short-lived secondary nuclei, the second is the storage ring mode, which is used for collecting and cooling the secondary rare isotope beams from the transport line. In order to fulfil its purpose, the ion optics can be set to different ion optical modes.

关键词： mass measurement lattice design dynamic aperture isochronous mode

Temperature-free mass tracking of a levitated nanoparticle

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Chinese Physics B 2023年第7期32卷 171-176页

作者：田原郑瑜刘吕航郭光灿孙方稳 CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

mass measurement is an essential analytical tool in the characterization of *** we present a method for measuring the mass of an individual nanoparticle which has a fg-level *** method enables a temperatureindependent mass measurement with the assistance of a sinusoidal electrostatic driving *** this approach,we successfully track the change in properties of an optically levitated nanoparticle,such as mass,temperature,and electric charge,with air *** abrupt change in the mass of silica nanoparticles is found to violate the Zhuravlev *** method can be utilized to extend the mass analysis of materials,such as thermogravimetric analysis,to individual microor nano-particles.

关键词： optical levitation nanoparticle mass measurement thermal desorption

Simulation of the Lanzhou Penning Trap LPT

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Chinese Physics C 2009年第S1期33卷 193-195页

作者：黄文学王均英王玥田玉林朱志超徐瑚珊肖国青 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

The LPT (Lanzhou Penning Trap) is under construction and its task is to perform direct mass measurement of fusion-evaporation residues and if possible for heavy isotopes. Detailed simulations have been done for a good understanding to the ion’s movement and mechanics in the trap. The optimization of the LPT is also performed based on the simulation. With a scale of 0.5 mm per grid used in the simulation and many other limitations a highest mass resolution has been achieved to be 1.9×10-5. An unexpected behaviour in the simulation related to magnetron motion has been found.

关键词： Penning trap super heavy mass measurement LPT

A Brief Presentation of Lanzhou Penning Trap Control System

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Plasma Science and Technology 2012年第6期14卷 478-480页

作者：田玉林黄文学王均英孙宇梁王玥朱志超赵建民徐瑚珊肖国青 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

LPT （Lanzhou Penning Trap） is an ion-trap facility in Lanzhou, China. As ions can be cooled to an extremely small phase space and can be stored for a very long time, ion traps are a perfect instrument for high precision mass measurements. A system with specialized electronics for LPT is under construction now. This system could be used for voltage and timing control to make ions moving in a special mode, and the data acquisition and analysis online/offline could be achieved in the mean time. The requirements of control system, the distribution of hardware, the overview of software, and the latest progress of LPTCtrlSys （Lanzhou Penning Trap Control System） are presented.

关键词： control system penning trap mass measurement LPT