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中性粒子分析仪的研究现状

原子能科学技术 2024年

作者：林炜平马龙汪彦熹屈玉凡罗圆谢德豪王硕曲国峰任培培罗小兵刘星泉韩纪锋 roy wada 臧临阁朱敬军四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室核工业西南物理研究院 Texas A & M University

中性粒子分析仪（NPA）作为托卡马克（Tokamak）装置的重要诊断工具，在等离子体物理研究中具有重要科学意义和广泛应用前景。NPA通过精确测量从等离子体中逃逸的中性粒子，可获取等离子体内部的关键信息，包括离子温度、快离子能谱分... 详细信息

中性粒子分析仪（NPA）作为托卡马克（Tokamak）装置的重要诊断工具，在等离子体物理研究中具有重要科学意义和广泛应用前景。NPA通过精确测量从等离子体中逃逸的中性粒子，可获取等离子体内部的关键信息，包括离子温度、快离子能谱分布和氢同位素比例等。自20世纪60年代首台NPA问世以来，经过60余年的技术发展，其诊断能力已经实现了质的飞跃，并且发展出了多种类型的NPA。针对中国环流3号（HL-3）装置的快离子物理研究，四川大学与核工业西南物理研究院联合研制了基于LYSO+SiPM探测器的串联式平行电磁场结构的NPA(E//B NPA)。该E//B NPA已安装到HL-3装置，并在等离子体放电实验中成功测量到高能量氘（D）中性粒子能谱，为今后HL-3装置中性粒子诊断及快离子研究奠定了坚实的技术基础。

关键词：中性粒子分析仪能量和质量分辨托卡马克快离子物理

IMF production and symmetry energy in heavy ion collisions near Fermi energy

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Nuclear Science and Techniques 2013年第5期24卷 1-6页

作者： wada roy HUANG Meirong LIN Weiping LIU Xingquan ZHAO Minghui CHEN Zhiqiang Institute of Modern Physics Chinese Academy of Science University of Chinese Academy of Sciences

The symmetry energy at the time of the production of intermediate mass fragments(IMFs) is studied using experimentally observed IMF multiplicities combined with quantum statistical model calculations(QSM of Hahn and St cker).The ratios of difference in chemical potentials between neutrons and protons relative to the temperature,(μn-μp)/T,and the double ratio temperature,T,were extracted experimentally in the reactions of64,70Zn,64Ni+58,64Ni,112,124Sn,197Au,232Th at 40A *** extracted(μn-μp)/TTscales linearly with δNN,where δNN is the asymmetry parameter,(N-Z)/A,of the emitting source and(μn-μp)/T=(11.1 1.4)δNN0.21 was *** experimentally extracted(μn-μp)/T and the double ratio temperatures are compared with those from the QSM *** temperatures-,T,and densities,ρ,extracted from the(μn-μp)/T values agreed with those from the double ratio thermometer which used the yield ratios of d,t,h and α *** the two analyses of the differential chemical potential analysis and the initial temperature analysis end up almost identical relation between T and ρ.T=5.25±0.75 MeV is evaluated from the(μn-μp)/Tanalysis,but no density determination was *** the extracted T value,the symmetry energy coefficient Esym =14.6±3.5 MeV is determined for the emitting source of T=5.25±0.75 MeV.

关键词：国际货币基金组织对称能重离子碰撞生产费米能量子统计模型实验观察中等质量碎片

Experimental reconstruction of primary fragments with kinematical focusing method

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Nuclear Science and Techniques 2013年第5期24卷 54-58页

作者： LIN Weiping wada roy HUANG Meirong LIU Xingquan ZHAO Minghui CHEN Zhiqiang Institute of Modern Physics Chinese Academy of Science University of Chinese Academy of Sciences

An experimental method was used to evaluate the primary isotope yields of semi-central collisions in the reaction system64Zn+112Sn at 40A *** characteristic nature of the hot nuclear matter at the time of the isotope formation was *** multiplicities of light particles(LPs) associated with intermediate mass fragments(IMFs) were determined experimentally by using a kinematical focusing *** primary isotope distributions,reconstructed by a Monte Carlo method,were compared with those of the AMD-Gemini ***/T=0.11 and asym/T=3.34 were extracted from the reconstructed primary fragments *** are consistent with those of the primary fragments of the AMD simulation.

关键词：运动学主段实验聚焦法同位素分布中等质量碎片蒙特卡罗方法反应体系

A simulation study of a windowless gas-stripping room in an E//B neutral particle analyzer

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Nuclear Science and Techniques 2021年第7期32卷 22-30页

作者： Yuan Luo Wei-Ping Lin Pei-Pei Ren Guo-Feng Qu Jing-Jun Zhu Xing-Quan Liu Xiao-Bing Luo Zhu An roy wada Lin-Ge Zang Yu-Fan Qu Zhong-Bing Shi Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA School of Physics Henan Normal UniversityXinxiang 453007China Southwestern Institute of Physics Chengdu 610064China

The neutral particle analyzer(NPA)is one of the crucial diagnostic devices in a Tokamak *** stripping unit is one of the main parts of the NPA.A windowless gas-stripping room with two differential pipes has been constructed in a parallel electric and magnetic fields(E//B)*** pressure distributions in the stripping chamber are simulated by ANSYS Fluent together with MolFlow+.Based on the pressure distributions obtained from the simulation,the stripping efficiency of the E//B NPA is studied using *** reaction physics is modified to track the charge state of each particle in a cross-section-based method in *** transmission rates(R)and stripping efficiencies f_(+1)are examined for particle energies ranging from 20 to 200 keV with the input pressure(P_(0)),ranging from 20 to 400 *** to the combined global efficiency,R×f_(+1),P_(0)=240 Pa is obtained as the optimum pressure for the maximum global efficiency in the incident energy range investigated.

关键词： Neutral particle analyzer Windowless gas-stripping chamber Stripping efficiency Ansys Fluent MolFlow+ GEANT4

An active base designed in high-counting-rate applications for Hamamatsu R1924A photomultiplier tube

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Nuclear Science and Techniques 2017年第10期28卷 59-63页

作者： Pei-Pei Ren Wei-Ping Lin roy wada Xing-Quan Liu Mei-Rong Huang Guo-Yu Tian Fei Luo Qi Sun Zhi-Qiang Chen Guo-Qing Xiao Rui Han Fu-Dong Shi Bo-Xing Gou Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA College of Physics and Electronics information InnerMongolia University for NationalitiesTongliao 028000China University of Science and Technology of China Hefei 230026China

Hamamatsu R1924A is one of the most widely used photomultiplier tubes(PMTs) in nuclear *** the active base suitable for R1924A is still not available in market, an active base is designed for Hamamatsu R1924A PMT, and the test results at high counting rates are presented. The active bases with two different sets of resistor chains were tested and compared by a frequency-controlled green straw hat LED light. A stable signal output up to 100 kHz is achieved using frequency-controlled LED pulsed light. The temperature of bases, which reflects the power consumption and is crucial for applications in vacuum, is also monitored with the same LED pulsed light. The temperature of the active base with smaller resistances reaches about twice of that of the active base with larger resistances in the resistor chain. For the applications in vacuum, the active base with resistance between the two sets of resistor chains may be preferable.

关键词：光电倍增管高计数率应用设计松活性基团 LED灯频率控制

Symmetry energy extraction from primary fragments in intermediate heavy-ion collisions

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Nuclear Science and Techniques 2015年第2期26卷 117-123页

作者：刘星泉黄美容 roy wada 林炜平任培培陈志强肖国青闵春华张苏雅拉图韩瑞靳增雪刘建立石福栋 Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences College of Information and Software Engineering University of Electronic Science and Technology

An improved method is proposed for the extraction of the symmetry energy coefficient relative to the temperature, asym/T, for the heavy-ion reactions near the Fermi energy region, based on the modified Fisher Model(MFM). This method is applied to the primary fragments of the Anti-symmetrized Molecular Dynamics(AMD)simulations for the reactions of40 Ca + 40 Ca at 35 Me V/nucleon. The density and the temperature at the fragment formation stage are extracted using a self-consistent method.

关键词：对称能重离子碰撞提取主段重离子反应分子动力学费米能级自洽方法

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中能重离子反应中的定向流的研究(英文)

IMP & HIRFL Annual Report 2011年 58-59页

作者：刘星泉 roy wada

It has been pointed out that anisotropic flows, such as a transverse or elliptic flow, are one of the most important observables, which constrains the nuclear force and the underlying EOS at super-normal density and re ects the evolution dynamics of nuclear collisions. Since the transverse ows are created in the primary stage of the reactions, the existing studies have been focused on the primary particles and the effects of the secondary particles, which are emitted during the cooling down stage of the excited fragments, have not been taken into account. In this study we first focus on the secondary particle effect on the transverse flow, which is investigated by using AMD(antisymmetrized molecular dynamics model) and Genimi codes.

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5 - 13 Nuclear Data Measurement Facility for ADS Spallation Target Design

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IMP & HIRFL Annual Report 2012年第1期 232-233页

作者： Chen Zhiqiang Liu Jianli Han Rui Shi Fudong Zhang Suyalatu Liu Xingquan Jin Zengxue Lin Weiping roy wada

AMD中Gogny核子-核子相互作用势对原子核基态性质的影响

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原子核物理评论 2020年第3期37卷 580-585页

作者：王金成张苏雅拉吐黄美容 roy wada 郑华王德鑫宋娜唐鑫立立内蒙古民族大学数理学院内蒙古通辽028000 内蒙古民族大学核物理研究所内蒙古通辽028000 Cyclotron Institute Texas A&M UniversityTexas 7843USA 陕西师范大学物理与信息技术学院西安710119 沈阳师范大学物理科学与技术学院沈阳110034

在反对称化的分子动力学(AMD)模型中,分别采用gO、gOas和gOass三套Gogny相互作用参数研究了^(4)He、^(6)Li、^(12)C、^(20)Ne、^(40)Ca和^(60)Ni的结合能和均方根半径在自身平均场中随时间的涨落。系统地研究了原子序数从1到18的同位素... 详细信息

在反对称化的分子动力学(AMD)模型中,分别采用gO、gOas和gOass三套Gogny相互作用参数研究了^(4)He、^(6)Li、^(12)C、^(20)Ne、^(40)Ca和^(60)Ni的结合能和均方根半径在自身平均场中随时间的涨落。系统地研究了原子序数从1到18的同位素的结合能,并与现有实验数据进行比较,发现gO的结果更接近实验值。这为利用AMD研究低能区的熔合和中能区的多重碎裂等核反应机制提供了基础。

关键词： AMD 结合能方均根半径