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Design of an efficient collector for the HIAF electron cooling system

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Nuclear Science and Techniques 2021年第10期32卷 39-49页

作者： Mei-Tang Tang Li-Jun Mao Hai-Jiao Lu Li-Xia Zhao Jie Li Xiao-Ping Sha Fu Ma Yun-Bin Zhou Kai-Min Yan Xiao-Ming Ma Xiao-Dong yang jian-cheng yang Institute of Modern Physics Chinese Academy of ScienceLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A collector with high perveance,efficient recu-peration,and low secondary emissions is required for the 450-keV electron cooler in the HIAF accelerator *** optimize the collection efficiency of the collector,a simulation program,based on the Monte Carlo simulations,was developed in the world’s first attempt to calculate the electron collection *** this program,the backscattering electrons and secondary electrons generated on the collector surface are calculated using a Monte Carlo approach,and all electron trajectories in the collector region are tracked by the Runge–Kutta *** this paper,the features and structure of our program are *** backscattering electron yields,with various collector surface materials,are calculated using our ***,the collector efficiencies for various col-lector structures and electromagnetic fields are simulated and *** measurement results of the collection efficiency of the HIAF collector prototype and the CSRm synchrotron are also *** experimental results were in good agreement with the simulation results of our program.

关键词： Electron cooler Secondary electron Backscattering electron Monte Carlo method Dielectric function

Two-plane painting injection scheme for BRing of HIAF

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Nuclear Science and Techniques 2017年第8期28卷 47-53页

作者： Guo-Feng Qu Wei-Ping Chai Jia-Wen Xia jian-cheng yang Heng Du Zhong-Shan Li Wen-Wen Ge Wen-Heng Zheng Peng Shang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China University of Chinese Academy of Sciences Beijing 100046China

The high-intensity heavy-ion accelerator facility(HIAF)is under design at the Institute of Modern Physics(IMP)and will provide an intense ion beam for nuclear physics,atomic mass measurement research,and other *** the main ring of HIAF,the BRing accumulates beams to high intensity and accelerates them to high *** achieve high intensities up to 1×10^(11)(^(238)U^(34+)),the injection gain of the BRing must be as high as ***,multiple multiturn injection supported by the electron cooling system takes a long time,causing substantial beam loss under a strong space charge ***,a two-plane painting injection scheme is proposed for beam accumulation in the *** scheme uses a tilted injection septum and horizontal and vertical bump magnets to paint the beam into horizontal and vertical phase space *** this paper,the two-plane painting injection parameters are optimized,and the resulting injection process is simulated using the Objective Ring Beam Injection and Tracking(ORBIT)*** injection gain of up to 110.3 with a loss rate of 2:3%is achieved,meeting the requirements of BRing.

关键词：绘画平面近代物理研究所注射过程重离子加速器电子冷却系统束流损失纵向相空间

Fast-bunching design of compact heavy ion RFQ linac

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Nuclear Science and Techniques 2018年第12期29卷 81-88页

作者： Ke-Dong Wang You-Jin Yuan Xue-Jun Yin jian-cheng yang Heng Du Zhong-Shan Li Xiao-Ni Li He Zhao Zi-Qiang Dong Jie Liu Jia-Wen Xia Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049China Huizhou Research Center of Ion Science Huizhou 516003China

We propose the construction of a compact linac as the injector of a cancer therapy facility at the Institute of Modern Physics(IMP) of the Chinese Academy of Sciences(CAS). Based on a traditional setup, a new compact fast-bunching design is first introduced to optimize the 600 keV/u RFQ with a 0.05 pm A ^(12)C^(4+) beam. This shortens the RFQ structure length from the standard design value of272–230 cm while effectively regulating the particle loss and emittance growth. In addition, a detailed error analysis was performed after the optimization process. The error sources cover input beam parameters errors, machining errors and alignment errors. The simulation results show that the beam loss and emittance growth of the RFQ are acceptable and within typical ranges of error.

关键词：线性加速器设计价值 RFQ 重离子单位面积优化过程中国科学院现代物理

Design of proton beam collimation system for HIAF-BRing

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Radiation Detection Technology and Methods 2022年第4期6卷 519-529页

作者： Wen-Heng Zheng jian-cheng yang Peng Li Da-Yu Yin Guo-Dong Shen Jie Li Li-Ping Yao Fu-Dong Shi Wei-Ping Chai Li-Jun Mao Wu-yuan Li Geng Wang Bo yang cheng Luo Wen-Wen Ge Zhong-Shan Li Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Science Beijing 100049China

Background The Booster Ring is further designed to store and accelerate protons up to 2×1012 particles per pulse in the High-Intensity heavy-ion Accelerator Facility project,which was originally designed to accelerate high-intensity heavy ion *** and Methods To minimize the uncontrolled proton beam halo loss around the ring in operation,a two-stage collimation system is proposed to provide a well-shielded dump for localizing the proton beam halo *** and conclusion In this paper,the simulation is carried out to evaluate the collimation system which shows a 92.93%collimation efﬁ***,several factors that affect the collimation efﬁciency are taken into consideration,including the physical aperture,the offset and rotation errors of the collimators,the closed orbit distortion,as well as the Betatron tunes.

关键词： Proton beam Two-stage collimation system ORBIT Collimation efﬁciency

Beam dynamics,RF measurement,and commissioning of a CW heavy ion IH-DTL

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Nuclear Science and Techniques 2018年第3期29卷 143-155页

作者： Heng Du You-Jin Yuan Zhong-Shan Li Zhi-Jun Wang Peng Jin Xiao-Ni Li Guo-Zhu Cai Wen-Wen Ge Guo-Feng Qu Yuan He Jia-Wen Xia jian-cheng yang Xue-Jun Yin Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A 53.667 MHz CW(continuous-wave) heavy ion IH-DTL has been designed for the SSC-LINAC injector of HIRFL-CSR(Heavy Ions Research Facility at Lanzhou-Cooling Storage Ring). It accelerates ions with maximum mass-to-charge ratio of 7.0 from 143 to 295 ke V/u. Low-power RF measurement of the IH-DTL1 has been taken to investigate the RF performance and the quality of the electric field distribution on the beam *** measured Q_0 value and the shunt impedance are 10,400 and 198 MX/m, respectively. The electric field distributions on and around the beam axis were evaluated and compared with the design value. By a new approach,the dipole field component is also estimated. The beam dynamics simulation using measured field distribution was presented in this paper. Based on the dynamics analysis in both transverse and longitudinal phase space, the field distribution can meet the design requirement. Finally, the RF conditioning and very first beam commissioning on the IH-DTL1 were finished. The beam test results agree well with the simulation results; what's more, the property of the variable output beam energy about the separated functions DTL was verified.

关键词： Linac RF measurement Beam dynamic simulation Commissioning

Charge resolution in the isochronous mass spectrometry and the mass of ^(51)Co

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Nuclear Science and Techniques 2021年第4期32卷 30-37页

作者： Xu Zhou Meng Wang Yu-Hu Zhang Hu-Shan Xu You-Jin Yuan jian-cheng yang Yu.A.Litvinov S.A.Litvinov Bo Mei Xin-Liang Yan Xing Xu Peng Shuai Yuan-Ming Xing Rui-Jiu Chen Xiang-cheng Chen Chao-Yi Fu Qi Zeng Ming-Ze Sun Hong-Fu Li Qian Wang Tong Bao Min Zhang Min Si Han-Yu Deng Ming-Zheng Liu Ting Liao Jin-yang Shi Yu-Nan Song Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China GSI Helmholtzzentrum fu¨r Schwerionenforschung Planckstraße 164291 DarmstadtGermany Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Science Xi’an Jiaotong UniversityXi’an 710049China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China CNRS/IN2P3 IJCLabUniversite´Paris-Saclay91405 OrsayFrance

Isochronous mass spectrometry(IMS)of heavyion storage rings is a powerful tool for the mass measurements of short-lived *** IMS experiments,masses are determined through precision measurements of the revolution times of the ions stored in the ***,the revolution times cannot be resolved for particles with nearly the same mass-to-charge(m/q)*** overcome this limitation and to extract the accurate revolution times for such pairs of ion species with very close m/q ratios,in our early work on particle identification,we analyzed the amplitudes of the timing signals from the detector based on the emission of secondary ***,the previous data analysis method is further improved by considering the signal amplitudes,detection efficiencies,and number of stored ions in the ring.A sensitive Z-dependent parameter is introduced in the data analysis,leading to a better resolution of ^(34)Ar^(18+) and ^(51)Co^(27+) with A/Z=17/*** mean revolution times of ^(34)Ar^(18+) and ^(51)Co^(27+) are deduced,although their time difference is merely 1.8 *** uncorrected,overlapped peak of these ions has a full width at half maximum of 7.7 *** mass excess of ^(51)Co was determined to be-27;332e41T keV,which is in agreement with the previous value of-27;342e48T keV.

关键词： Isochronous mass spectrometry Charge resolution Signal amplitude Micro-channel plate ^(51)Co

Dielectric-ion-conductive ZnNb2O6 layer enabling rapid desolvation and diffusion for dendrite-free Zn metal batteries

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Journal of Energy Chemistry 2025年第1期100卷 693-701页

作者： Haifeng yang jian Wang Panpan Zhang Xiaomin cheng Qinghua Guan Jing Dong Bixian Chen Lujie Jia Jing Zhang Yongzheng Zhang Yunjian Liu Hongzhen Lin School of Materials Science and Engineering Jiangsu University i-Lab & CAS Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Helmholtz Institute Ulm (HIU) Karlsruhe Institute of Technology (KIT) School of Materials Science and Engineering Xi'an University of Technology State Key Laboratory of Chemical Engineering East China University of Science and Technology

Rechargeable aqueous zinc-metal batteries （AZMBs） are promising candidates for large-scale energy storage systems due to their low cost and high ***,their performance and sustainability are significantly hindered by the sluggish desolvation kinetics at the electrode/electrolyte interface and the corresponding hydrogen evolution reaction where active water molecules tightly participate in the Zn（H2O）62+solvation ***,learnt from self-generated solid electrolyte interphase （SEI） in anodes,the dielectric but ion-conductive zinc niobate nanoparticles artificial layer is constructed on metallic Zn surface （ZNB@Zn）,acting as a rapid desolvation *** zincophilic and dielectric-conductive properties of ZNB layer accelerate interfacial desolvation/diffusion and suppress surface corrosion or dendrite formation,achieving uniform Zn plating/stripping behavior,as confirmed by electronic/optical microscopies and interface spectroscopical measurements together with theoretical ***,the as-prepared ZNB@Zn electrode exhibits excellent cycling stability of over 2000 h and robust reversibility （99.54%） even under high current density and depth of discharge ***,the assembled ZNB@Zn-based full cell displays high capacity-retention rate of 80.21%after 3000 cycles at 5 A g-1and outstanding rate performance up to 10 A *** large-areal pouch cell is stabilized for hundreds of cycles,highlighting the bright prospects of the dielectric but ion-conductive layer in further application of AZMBs.

关键词： Zn metal battery Dielectric artificial layer Rapid ion diffusion Zincophilic diffusion Active water inhibition

基于小波变换的固体火箭发动机地面试验图像的烟雾去除方法

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系统仿真学报 2004年第11期16卷 2490-2492页

作者：程建杨杰上海交通大学图像处理与模式识别研究所上海200030

针对固体火箭发动机(SRM)地面试验图像受烟雾干扰严重,在SRM地面试验图像预处理中,烟雾去除研究非常重要。首先从频域滤波法进行了探讨,然后根据小波变换能兼顾空频域和多分辨率分析的特性提出了一种基于小波变换的图像烟雾去除方法。... 详细信息

针对固体火箭发动机(SRM)地面试验图像受烟雾干扰严重,在SRM地面试验图像预处理中,烟雾去除研究非常重要。首先从频域滤波法进行了探讨,然后根据小波变换能兼顾空频域和多分辨率分析的特性提出了一种基于小波变换的图像烟雾去除方法。实验结果表明,所提出的基于小波变换的方法对SRM地面试验图像的烟雾去除更有效。

关键词：固体火箭发动机(SRM) 图像预处理烟雾去除小波变换

The IH-RFQ for HIRFL-CSR injector

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Nuclear Science and Techniques 2018年第6期29卷 119-127页

作者： Zhong-Shan Li Xue-Jun Yin Heng Du Jia-Wen Xia You-Jin Yuan jian-cheng yang Peng Li Jie Li Xiao-Ni Li Guo-Dong Shen Wen-Wen Ge Wen-Heng Zheng Xiao-Hu Zhang Ke-Dong Wang Yun-Zhe Gao Qi-Yu Kong Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049China

A new linac injector CSR-LINAC for the Cooler Storage Ring of the Heavy Ion Research Facility in Lanzhou(HIRFL-CSR) is proposed to improve the performance of the HIRFL. As a key component of the CSRLINAC, the 108.48-MHz radio frequency quadrupole(RFQ) is under design at the Institute of Modern *** ions with mass-to-charge ratios of 3–7 will be accelerated from 4 to 300 keV/u by the RFQ. In the beam dynamics design, the New Four-Section Procedure is adopted to improve the transmission efficiency and obtain a compact structure. In this paper, a transmission efficiency of 98.0% in the 3.07-m-long cavity was obtained. The Interdigital H-type structure is employed because of its mechanical stability and high shunt impedance. The RF performance of the cavity is investigated by the electromagnetic simulation. The optimized results of the electric field to meet the beam dynamics requirements are presented in this paper.

关键词： HIRFL-CSR 注射线性加速器动力学设计机械稳定性关键部件现代物理重离子