分类： 核科学技术 >> 核科学技术其他学科 提交时间： 2025-07-12
摘要： 铅基堆堆芯上腔室的温度振荡现象是影响核电站安全稳定运行的关键因素之一，其准确描述对热脉动机制的分析具有重要意义。采用SST k-ω湍流模型对该现象进行了数值模拟研究，定量分析了模型中β1、β2、β*三个参数对温度结果的影响及其不确定区间，并进行了参数敏感度分析。研究结果表明，温度不确定性的分布特征与流体流动和混合过程有着密切的联系。喷口附近区域由于受到喷口射流的直接影响，温度不确定性较低；而冷热喷口中间区域由于流体混合作用强烈，不确定性相对较高，特别是β2和P*参数在所研究的范围内对温度结果的不确定性有较大的贡献，这些发现为后续模型改进和工程应用提供了科学指导。
分类： 核科学技术 >> 核科学技术其他学科 提交时间： 2025-07-12
摘要： 六方氮化硼具有与石墨烯类似的六元环组成的片层结构，因而呈现出优异的机械性能和导热性能，在诸多应用领域受到广泛关注。基于六方氮化硼制备工艺的高能耗问题，本文旨在提出一种更加绿色、低能耗的制备工艺。本工作使用熔盐介质法作为制备工艺方法。该方法以KCl-NaCl为熔盐体系，三聚氰胺（C3N6H6）和硼酸（H3BO3）为反应物，并且通入氮气（N2）作为反应气氛。该研究通过改变熔盐与反应物质量比、反应物中氮-硼摩尔比、保温温度、保温时间等条件，系统研究了不同条件对制备六方氮化硼产物的影响。通过对各种所得样品的表征分析，得出最优的制备条件。在该工作的系统研究下，发现熔盐与反应物质量比为2:1、氮-硼摩尔比为1:2、1000℃保温10小时为最佳制备条件。在该条件下可以制备出平均尺寸50nm大小左右的六方氮化硼纳米片。说明在最佳工艺条件下，可以制备出粒径可控、形貌一致、结晶良好的六方氮化硼纳米片。本工作提供了一种绿色低碳合成六方氮化硼纳米片的新途径。
分类： 物理学 >> 核物理学 提交时间： 2025-07-10
Zhou, Mr. Shiqiang
Wang, Prof. Dong
Xie, Mr. Li-Rong
Lian, Mr. Chen
Zhou, Mr. Zhuo
Sun, Prof. Xiangming
Liu, Prof. Hongbang
Gao, Prof. Chaosong
liu, Mr. jun
Feng, Mr. Huan-Bo
Yi, Mr. DiFan
Zhang, Mr. Zi-Yi
Liu, Miss Si-Ying
Liu, Mr. Meng-Ping
Fang, Mr. Ni
chen, Mr. Ran
Luo, Mr. Yan-Jun
Dong, Mr. Chunlai
Tong, Mr. Yi-Chen
Lu, Miss Meng-Xin
摘要： This paper presents a novel pixel chip readout scheme: the Region-of-Interest Readout Circuit (ROIRC), which is designed for large area, large array pixel chips and Gas Pixel Detector (GPD). This design employs a sentinel pixel detection strategy, enabling rapid identification and prioritized readout of the pixel regions containing signal events. During the scanning readout of these signal events, ROIRC employs a Block-based readout approach, effectively minimizing the readout of non-signal pixels. The functionality of ROIRC has been successfully implemented on both the ASIC and FPGA platforms. In the tests of the ROIRC, the detector is capable of detecting low-energy X-rays in the range of 2-10 keV and support multiple event readouts, and the detector can perform effective readout of effective photons with a flux of up to 15k · (cm-2 · s-1) .
分类： 物理学 >> 核物理学 提交时间： 2025-07-10
摘要： Due to the current situation of the lack of devices and methods for measuring the internal contamination caused by radionuclides in wounds, which may be caused in spent fuel reprocessing and radioisotope production, we developed a new non-contact measurement system for radionuclide-contaminated wounds with better resolution, moderate size, and easy for clinical application by using the imaging and energy spectroscopy measurement technology to measure the amount and distribution of the contamination retained in wound. With that system，a measurement method to estimate the retention depth and activity of nuclides in the injured part was established by making use of the difference of the absorption attenuation coefficient of X/γ rays emitted by retained nuclides in the injured limb with different thicknesses , which realizes the identification of the retained nuclides in wounds, the measurement of the depth and activity of nuclides retained in different types of wounds, as well as the determination of the characteristics of the distribution of radioactive contamination in wounds. The problem of measuring the characteristics of radionuclide-contaminated wounds are solved fundamentally. This study is of great significance in upgrading the level of existing technology for radionuclide-contaminated wounds at home and abroad, improving the monitoring and evaluation system of internal irradiation, and enhancing the occupational health protection level of radiation practitioners.
分类： 物理学 >> 核物理学 提交时间： 2025-07-10
摘要： Austenitic stainless steels have been extensively utilized as key structural components in nuclear reactors, yet they exhibit a strong tendency to undergo swelling under neutron irradiation, which consequently deteriorates their mechanical performance. Hence, reliable prediction of the swelling evolution in austenitic stainless steels is essential to guarantee their operational integrity during reactor service. This research draws on a curated dataset documenting neutron irradiation-induced swelling in austenitic stainless steels, in which correlation analysis and recursive feature elimination were used to identify critical factors governing swelling behavior—namely, temperature, neutron flux, and the concentrations of Cr, Mn, Ni, Si, P, and C. Based on the 15 selected features, a multilayer perceptron (MLP) model was developed for predictive analysis of swelling, enabling precise prediction of the peak swelling temperature and the dose corresponding to the swelling incubation stage. Using the trained MLP model, a quantitative relationship was established between the swelling rate and the elemental concentrations of Cr, Mn, Ni, Si, P, and C. The analysis revealed that higher Cr content consistently promotes swelling, while increases in Si and P (above 0.02 wt.%) effectively suppress swelling. Additionally, there exist threshold concentrations for Mn (2.5 wt.%), Ni (35 wt.%), and C (0.1 wt.%), beyond which swelling is most effectively mitigated. The results of elemental interaction analysis indicate that in austenitic stainless steels containing high levels of Cr, Ni must be increased to 15–20 wt.% to achieve enhanced swelling resistance. Under conditions of low C concentration, increasing the P content appropriately can enhance the material's resistance to irradiation-induced swelling. These findings offer quantitative guidance for designing and optimizing the composition of austenitic stainless steels with improved swelling resistance under irradiation.
分类： 物理学 >> 核物理学 提交时间： 2025-07-09
摘要： Within the framework of the isospin-dependent quantum molecular dynamics model, the fusion cross section and fusion mechanism of neutron-deficient Pu isotopes in the reactions 24,26,30Si+196Hg were investigated. We found that the fusion cross sections are higher in the reaction with a more neutron-rich beam owing to the lower dynamical barrier. The dynamic barrier decreases with decreasing incident energy, which explains the fusion enhancement at the sub-barrier energy. The peak value of N/Z ratio in the neck region was the highest in reaction 30Si+196Hg, indirectly leading to the lowest dynamic barrier. Compared with the proton density distribution, the neck region for neutrons is larger, indicating that neutrons transfer more quickly than protons, leading to a high N/Z ratio in the neck. The time distribution of the appearance of dynamical barriers was wider at lower incident energies, indicating that the fusion process took longer to exchange nucleons. The single-particle potential barrier decreases with time evolution and finally disappears at a lower impact parameter, which is favorable for fusion events.
分类： 物理学 >> 核物理学 提交时间： 2025-07-09
Jiao, Dr. Pu
Hao, Dr. Zirui
Li, Dr. Zhicai
Sun, Dr. Qiankun
Liu, Dr. Longxiang
Xu, Dr. Hanghua
Zhang, Dr. Yue
Zhou, Miss Mengdie
Yang, Dr. Yuxuan
Jin, Dr. Sheng
Chen, Dr. Kaijie
Ye, Mr. Shan
Wang, Dr. Zhenwei
Wang, Dr. Yuting
Wei, Mrs. Hui-Ling
Fu, Dr. Yao
Wang, Prof. Hongwei
Fan, Prof. GongTao
Ma, Dr. Chun-Wang (Nuclear physics) 马春旺
摘要： To overcome the difficulty and expensive cost for some specific isotopic targets, a substitution method was proposed to measure the cross section of (γ, n) reactions. Considering that the natural copper element (natCu) only has 63Cu and 65Cu isotopes, the 65Cu(γ, n)64Cu reaction was taken as an example to test the substitution method. Using quasi-monoenergetic γ beams provided by the Shanghai Laser Electron Gamma Source (SLEGS) of the Shanghai Synchrotron Radiation Facility (SSRF), the natCu(γ, n) was measured from Eγ= 11.09 to 17.87 MeV. Furthermore, based on the 63Cu(γ, n) reaction measured using the same experimental setup at SLEGS, the 65Cu(γ, n)64Cu was extracted using the substitution method. The abundance variation of natural copper, showing a significant influence in the cross section, is also investigated. The results were compared to the existing experimental data measured by bremsstrahlung and positron annihilation in-flight sources, and the TALYS 2.0 predictions. The γ strength function (γSF) of 65Cu is obtained from the 65Cu(γ, n) data, and the reaction cross section of 64Cu(n, γ) was further calculated.
分类： 核科学技术 >> 核科学与技术 提交时间： 2025-07-09
摘要： The Shanghai High Repetition Rate XFEL and Extreme Light Facility (SHINE) is currently under construction as one of the world’s most advanced hard X-ray free-electron laser facilities. The timing system, as an essential part of the free-electron laser facility, provides precise timing of trigger pulse signals for a range of devices to ensure that particles are generated and accelerated to the designed energy while enabling the precise measurement of beam parameters. To precisely distribute and synchronize the 1.003086MHz (1300/1296) timing signals over a distance of approximately 3.1km based on White Rabbit technology, three technical routes have been proposed. This paper begins with a description of the design and development process of the timing system for the SHINE project, which culminates with the determination of the design scheme. During the installation and commissioning of the timing system, the jitter accuracy of the timing signal was tested and found to be less than 10ps, which meets the requirements of the project. Furthermore, the precise clock synchronization signal provided by the timing system supported the joint debugging of various related systems and realization of beam acquisition.
分类： 物理学 >> 核物理学 提交时间： 2025-07-08
Li, Dr. ouyi
Meng, Dr. Weijia
Fang, Dr. Wenxiang
Zhong, Dr. Bin
ma, Prof. tianyu 马天予
yu, Prof. ganglin
摘要： For controlled nuclear fusion, it is of significance to develop a comprehensive simulation environment for Inertial Confinement Fusion(ICF) . This environment must accurately calculate the energy loss of charged particles in high-temperature, high-density plasma, and simulate the physical parameters of fusion reactions and products. This study presents a novel implementation of a modified Li-Petrasso (MLP) energy loss theory within the Geant4 framework, to address the critical challenge of simulating charged particle transport in high-temperature, high-density plasma for ICF research. The modified theory integrates binary collision terms, collective plasma effects, and quantum degeneracy corrections, enabling accurate calculations of stopping power, mean collision path, and energy transfer dynamics for particles such as recoil alpha particles, deuterons, and tritons under extreme plasma conditions. This work provides a detailed introduction to how to embed and calculate this process within Geant4 and verifies the correctness of the embedded model. Full simulation of the fusion process is also conducted. The results demonstrate that the improved Geant4 can effectively handle the energy loss of charged particles in such environments, calculate important fusion parameters like neutron energy spectrum and energy transfer ratios, and observe the production of ultra-high-energy neutrons. Comparisons with experimental fusion data show significant improvements in consistency, validating the improved Geant4's validity and accuracy. This work has, for the first time, achieved full simulation of charged particle energy loss and secondary neutron spectrum of ICF using Geant4, providing valuable insights into ICF characteristics and aiding in the development of more accurate fusion simulations.
分类： 物理学 >> 核物理学 提交时间： 2025-07-08
Zhu, Mr. Jun-Yu
Li , Dr. Xiao
Yu, Ms. Jiebing
Lu, Dr. Zhijun
Hao, Dr. XueRui
Wu, Dr. Bin
Zhang, Mr. Ling Chun
Long, Mr. Wei
Liu, Mr. Yang
Chen, Mr. Shengyi
Wu, Dr. Jian
Li, Dr. Xiang
摘要： Double radio-frequency (RF) systems, comprising both fundamental and harmonic cavities, are essential in advanced synchrotron light sources for lengthening beam bunches, thereby increasing the Touschek lifetime and reducing intrabeam scattering. RF cavities must incorporate effective higher-order mode (HOM) damping to mitigate coupled bunch instabilities (CBI). Additionally, a compact design is crucial for fitting within the limited straight sections of storage rings. This paper presents a novel coaxial bimodal cavity that simultaneously delivers fundamental and harmonic voltages, allowing independent operation of both modes and effective HOM damping. It offers a more compact and efficient alternative to conventional separate cavities. A prototype cavity design was developed, featuring resonant frequencies of 166.6 MHz for the fundamental mode and 499.8 MHz for the third harmonic mode. Simulation results indicate the successful implementation of a bimodal RF cavity, featuring independent frequency tuning, separate RF drives, and effective HOM damping. This work offers a compact and efficient solution for implementing double-frequency RF systems in advanced synchrotron light sources.
分类： 核科学技术 >> 粒子加速器 提交时间： 2025-07-07
摘要： 上海质子治疗装置（SAPT）是首台国产质子治疗示范装置，旋转机架是质子治疗装置中的重要组成部分，等中心精度达±0.275mm，优于国际主流设备，要求高运动定位精度和可靠性。本研究揭示了位于瑞金质子中心360°旋转机架的研制和等中心精度的研究并与实测结果进行对比。通过ANSYS对旋转机架进行有限元分析，使用激光跟踪仪测量实际变形情况，验证了典型工况下等中心点处的精度要求并进行原因分析，验证了国产旋转机架的可靠性。
分类： 物理学 >> 核物理学 提交时间： 2025-07-07
Shi-Yu Zhang
Yang-Bo Nie
Qi Zhao
Xin-Yi Pan
Yan-Yan Ding
Kuo-Zhi Xu
Xiao-Yu Wang
Bei-Bo He
Qi Sun
Jie Ren
Hong-Tao Chen
Xi-Chao Ruan
Zheng Wei
摘要： Beryllium (9Be) serves as a crucial neutron multiplier and reflection material, being extensively employed in the nuclear industry. The evaluated nuclear data are utilized in the design of the nuclear devices. Following the interaction between neutrons and 9Be, all neutrons generated stem from the 9Be(n, 2n)8Be reaction chan nel, except for the elastic scattering reaction channel. Nevertheless, the data of the outgoing neutron double differential cross section of the reaction channel provided by the latest internationally evaluated libraries still exhibit considerable discrepancies. A shielding integral experiment based on slab 9Be samples with measure ments of neutron spectra leaked from different angles is an effective approach to verify the double differential cross section data. Hence, in this study, a shielding integral experiment of 9Be samples of different thicknesses was conducted using a nanosecond pulsed deuterium-tritium neutron source established by the China Institute of Atomic Energy. Theneutron time-of-flight spectra of three thicknesses (4.4 cm, 8.8 cm, and 13.2 cm) and six an gles (47◦, 58◦, 73◦, 107◦, 122◦, and 133◦) were measured by the neutron time-of-flight method, and 18 sets of experimental data were obtained. Additionally, the MCNP-4C program was used to obtain the simulated results of the leakage neutron spectra using the evaluated nuclear data of 9Be from the CENDL-3.2, ENDF/B-VIII.0, JENDL-5, and JEFF-3.3 libraries. The simulated results of the leakage neutron spectra were compared with the experimental results, and the results showed that in the elastic scattering energy region, the simulated results from the CENDL-3.2, ENDF/B-VIII.0, and JENDL-5 libraries were slightly higher at small angles and slightly lower at large angles. In the (n, 2n) energy region, the simulated results from the CENDL-3.2 library were significantly different from the experimental results in terms of spectral shape, and the simulated results from the ENDF/B-VIII.0 and the JENDL-5 libraries were in good agreement with the experimental results at small angles but low at large angles. The simulated results from the JEFF-3.3 library showed serious underestimation at all angles.
分类： 核科学技术 >> 核科学与技术 提交时间： 2025-07-07
摘要： 铅铋共晶合金（Lead-Bismuth Eutectic，LBE）因其高导热系数、高热容以及可在常压下高温运行的特点，成为第四代反应堆一回路冷却剂的主要候选介质之一。非等温液态LBE在上腔室复杂结构中的不充分混合会引起非周期性温度波动，并对反应堆结构材料的完整性造成影响，是使用LBE作为一回路介质的反应堆需要重点关注的热工流体现象。基于公开的液态钠平行三喷口实验数据，本文对比分析了不同湍流模型在模拟温度脉动方面的适用性，并进一步比较了LBE与液态钠在平行三喷口结构中的温度脉动强度。在此基础上，采用经过验证的大涡模拟（Large-Eddy Simulation，LES）方法，开展了LBE在反应堆上腔室复杂流通结构中的温度脉动特性研究。结果表明：LBE的温度脉动强度主要集中在1~10 Hz范围内，属于典型的低频脉动；温度脉动最为剧烈的区域位于堆芯出口至热管段之间的约3/4高度处；而在堆芯出口远端，由于非等温LBE混合较为充分，其温度脉动强度显著减弱。研究成果可为结构材料的热疲劳评估及反应堆测点布置提供重要参考。
分类： 物理学 >> 核物理学 提交时间： 2025-07-07
梁, Dr. 杰
Wang, Mr. Ke-liang
Guo, Dr. Ji-ping
Zhang, Mrs. Fan
Wu, Ms. Ya-qin
Jun, Prof. Yang
Zhun, Prof. Ying-chun
摘要： This paper reports an experimental investigation into the backscatter effects on gamma radiation monitors. The study addresses deviations in measurement readings observed in wall-mounted monitors compared to free-air devices due to backscatter phenomena. Reinforced concrete test blocks were employed to simulate operational environments, with measurements conducted using three detector types: a radiation protection level dosimeter with ionization chamber, an air-kerma radiation monitor with counter tube, and a radiation detector with NaI(Tl) scintillator. Analysis of backscatter factors at varying distances and orientations revealed that: (1) backscatter factors decreased with increasing source-to-surface distance, and (2) central irradiation generally yielded higher backscatter factors than non-central irradiation. The experimental data provide essential reference for formulating or revising pertinent technical standards.
分类： 核科学技术 >> 核科学与技术 提交时间： 2025-07-06
摘要： Recently, machine learning has become a powerful tool for predicting nuclear charge radius $R_{\mathrm{C}}$, providing novel insights into complex physical phenomena. This study employs the continuous Bayesian probability (CBP) estimator and the Bayesian model averaging (BMA) to optimize the predictions of $R_{\mathrm{C}}$ from sophisticated theoretical models. The CBP estimator treats the residual between the theoretical and experimental values of $R_{\mathrm{C}}$ as a continuous variable, deriving its posterior probability density function (PDF) from Bayesian theory. The BMA method assigns weights to models based on their predictive performance for benchmark nuclei, thereby accounting for each model’s unique strengths. In global optimization, the CBP estimator improves the predictive accuracy of the three theoretical models by about 60\%. In extrapolation analyses, it consistently achieves an improvement rate of approximately 45\%, demonstrating the robustness of the CBP estimator. Furthermore, the combination of the CBP and BMA methods reduces the standard deviation to below 0.02 fm, effectively reproducing the pronounced shell effects on $R_{\mathrm{C}}$ of the Ca and Sr isotope chains. The studies in this paper propose an efficient way to accurately describe $R_{\mathrm{C}}$ of unknown nuclei, with potential applications to research on other nuclear properties.
分类： 核科学技术 >> 核仪器、仪表 提交时间： 2025-07-05
摘要： 我们提出了一种混合康普顿与正电子发射断层成像（PET）的原型系统，旨在提升数据利用率并实现多种放射性药物的同步成像。该原型系统包含两个采用LYSO-SiPM（硅光电倍增管耦合掺铈硅酸钇镥晶体）的探测器，均为实验室现有设备。其中一个探测器由50 × 50阵列的LYSO晶体组成，单晶体尺寸为0.9 mm × 0.9 mm × 10 mm，中心间距1 mm；另一个探测器则由25 × 25阵列的LYSO晶体组成，单晶体尺寸为1.9 mm × 1.9 mm × 10 mm，中心间距2 mm。这些探测器安装于一个旋转平台上，使其既可作为康普顿相机，也可作为PET探测器对工作。每个探测器的64通道SiPM信号通过电容复用电路处理，产生四个位置加权输出信号。采用不同的能量窗区分康普顿事件与PET事件。通过多种放射源对能量分辨率及能量-通道关系进行了标定。在511 keV能量点，测得两个探测器的平均能量分辨率（半高全宽，FWHM）分别为17.5%和15.2%。初步实验结果表明，该系统在康普顿成像模式下的角分辨率（FWHM）为8.6°。注入¹⁸F溶液的V形导管得到了清晰重建，进一步验证了系统在康普顿成像模式下的成像能力。模拟和实验成像研究结果显示，在PET成像模式下，该系统可检测直径小至1毫米的肿瘤。成功进行了小鼠骨骼PET成像，其结果与相应的计算机断层扫描（CT）图像匹配良好。该技术在推动生理功能成像模态的发展方面具有巨大潜力。
分类： 物理学 >> 核物理学 提交时间： 2025-07-05
摘要： 介子束流与原子核碰撞实验在中高能核物理和粒子物理研究领域发挥了重要推动作用，特别是在强子谱研究方面取得了一系列重要实验测量结果。本文对目前国际上几个比较典型的介子束流实验进行了梳理与总结，这包括了位于日本的 J-PARC 实验；欧洲核子中心的 COMPASS 实验、AMBER 实验以及计划中的 HIKE实验；美国 JLab 的 GlueX 实验和 EIC 项目。进一步，我们基于国内的 HIAF 装置对可能产生的次级介子束流的参数指标进行了分析估算，并讨论了可以开展的相关物理测量。通过对这些实验项目的调研分析，旨在为进一步规划和建造我国的介子束流实验装置并开展强子物理方面的研究有所启发和借鉴。
分类： 物理学 >> 核物理学 提交时间： 2025-07-05
摘要： The Cerenkov detector has a distinct advantage in constructing the reaction vertex and incident direction of energetic particles, enabling the identification of emission sources. We propose a novel approach to measure neutrino sources by employing a modular photomultiplier tube (PMT) array, utilizing clean and transparent deep sea water as the sensitive medium. The feasibility of detecting solar neutrinos is demonstrated through extensive simulations using the Geant4 package. These simulations incorporate the production and transport of Cerenkov photons generated by electron scattering, with the Hough transform method applied to enhance the accuracy of vertex and direction reconstruction, particularly in the presence of noisy or incomplete data. The dominant background from γ-radiation due to 40K in seawater can be suppressed by a factor of 10^7 by introducing a threshold on the number of triggered PMTs. The total reconstruction efficiency increases with incident energy, achieving 25% for 6 MeV neutrinos and 52% for 10 MeV neutrinos, respectively. For source localization, a sufficient number of neutrino events must be detected, depending on background intensity above the threshold. The Hough transform is also applied to manage high noise levels during this process. The simulation results confirm the feasibility of detecting solar neutrinos using deep sea water, paving the way for future underwater neutrino detection systems.
分类： 核科学技术 >> 核科学与技术 提交时间： 2025-07-04
Jiarong wang
Bingsheng tu
Jifei Wu
Tianhang Zhang
Jialin Liu
Jiateng Peng
Jiawei Wang
Yang Shen
Baoren Wei
Yaming Zou
摘要： Accurate atomic mass data hold significant application value in various research fields, in which Penning Trap mass spectrometry is considered the most precise experimental method. A cryogenic detection system is a key component for reading out the image charge of charged particles in Penning traps using the Fouriertransform ion cyclotron resonance technique. In this paper, we present the development and characteristics of this detection system, which includes a superconducting resonator and cryogenic low-noise amplifiers. The resonator consists of delicately woven thin NbTi wires configured into a multilayer helical coils, offering a quality factor of 98004 at around 1 MHz. Low-noise amplifiers are developed based on GaAs field-effect transistors, exhibiting amplification factors greater than 27 dB with a power consumption of approximately 6 mW in the frequency range of 0.1 to 10 MHz. The lowest input voltage noise is 0.8 nV/ √ Hz at 1 MHz. The fabrication process, operation, and measurements are elucidated in detail.
分类： 物理学 >> 核物理学 提交时间： 2025-07-04
摘要： A first attempt to simulate the charge exchange process of C2+ to C-, in which C2+ with low energy through an exchange medium, using the Monte Carlo Software Geant4 has been accomplished. The yields of Cq (q=-2, -1, 0 and +1) from injected C2+ with different energies into different exchange medium are measured by setting up the physical model in the simulation program. The effect of different energies (range from 60 to 300keV), different exchange medium (isobutene and methane), different density distribution of exchange medium in charge exchange cell on the charge exchange efficiency have been studied. The comparison of the present results with the experimental results shows the feasibility of this method. Moreover, the present results demonstrate that low-density diffuse regions on either side of the high-density central region in the charge exchange cell has a significant contribution to improving the charge exchange efficiency. The charge exchange efficiency in organic non-metallic gases of isobutene is higher than in methane, particularly, an efficiency close to 2% of C2+ to C- conversion can be achieved in methane.
点击量
待评议
点击量
下载量
评论
通过
