作者机构：
[凌煜凡; 代圣齐; 赵鹏程; 朱恩平; 王继锋; 唐欢] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu;610213, China;[凌煜凡; 代圣齐; 朱恩平; 王继锋; 唐欢] 421001, China
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者：
Li Guo-Zhuang;Zhang Sheng;Jiao Zhi-Hong;Li Xin-Xia
期刊：
物理学报,2022年71(3):199-206 ISSN：1000-3290
通讯作者：
Li, XX;Zhang, S
作者机构：
[Li Xin-Xia; Li, XX; Li Guo-Zhuang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zhang Sheng; Li Guo-Zhuang] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.;[Jiao Zhi-Hong] Northwest Normal Univ, Coll Phys & Elect Engn, Lanzhou 730030, Peoples R China.;[Jiao Zhi-Hong; Zhang Sheng; Li Guo-Zhuang] Adv Energy Sci & Technol Guangdong Lab, Huizhou 516003, Peoples R China.
通讯机构：
[Zhang, S ] C;[Li, XX ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.
通讯机构：
[Xiao-Dong Wang] S;School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
Monte Carlo simulation;Muon tomography;Image reconstruction
摘要：
Muon tomography is a novel method for the non-destructive imaging of materials based on muon rays, which are highly penetrating in natural background radiation. Currently, the most commonly used imaging methods include muon radiography and muon tomography. A previously studied method known as coinciding muon trajectory density tomography, which utilizes muonic secondary particles, is proposed to image low and medium atomic number (Z) materials. However, scattering tomography is mostly used to image high-Z materials, and coinciding muon trajectory density tomography exhibits a hollow phenomenon in the imaging results owing to the self-absorption effect. To address the shortcomings of the individual imaging methods, hybrid model tomography combining scattering tomography and coinciding muon trajectory density tomography is proposed and verified. In addition, the peak signal-to-noise ratio was introduced to quantitatively analyze the image quality. Different imaging models were simulated using the Geant4 toolkit to confirm the advantages of this innovative method. The simulation results showed that hybrid model tomography can image centimeter-scale materials with low, medium, and high Z simultaneously. For high-Z materials with similar atomic numbers, this method can clearly distinguish those with apparent differences in density. According to the peak signal-to-noise ratio of the analysis, the reconstructed image quality of the new method was significantly higher than that of the individual imaging methods. This study provides a reliable approach to the compatibility of scattering tomography and coinciding muon trajectory density tomography.
作者机构：
[杨光; 钟翊君; 龚学余; 黄千红] Department of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[郑平卫] Department of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, China;[王占辉] Institute of Fusion Sciences, Southwestern Institute of Physics, Chengdu, 610000, China
通讯机构：
[Zhong, Y.; Gong, X.] D;Department of Nuclear Science and Technology, China
关键词：
杂质输运;电子回旋波
摘要：
本文基于OMFIT（One Modeling Framework for Integrated Tasks）平台，结合中国环流器二号M（HL-2M）托卡马克装置参数，自洽耦合等离子体平衡、外部辅助加热和电流驱动、输运等物理过程，考虑杂质浓度变化引起的等离子体密度、温度等输运量变化，以及引起的等离子体磁面中心Shafranov位移变化，从理论上进行杂质浓度变化对电子回旋波（Electron Cyclotron Wave，ECW）沉积位置和驱动电流效率的影响研究。研究结果表明，考虑杂质对等离子体的影响时，随着杂质浓度的增加，ECW沉积径向位置先向等离子体芯部移动然后向边缘移动，电流驱动效率先增加后减小。不考虑杂质对等离子体影响时，ECW沉积位置基本不变，电流驱动效率降低。 Background
In recent years, electron cyclotron wave (ECW) heating and current drive (ECCD) have been widely used in tokamak discharge experiments. The inevitable presence of impurity particles in the tokamak plasma affects the ECCD through radiation energy, inhibition of turbulent transport, and change the collision rate. Changes in plasma density, temperature and other transport quantities caused by the change of impurity concentration, induce the changes of Shafranov displacement at the center of magnetic surface of the plasma.
Purpose
This study aims to investigate the influence of impurity concentration changes on the ECW deposition position and current drive efficiency theoretically with consideration of all above related variations.
Methods
The One Modeling Framework for Integrated Tasks (OMFIT) platform was used to conduct integrated simulation study of the effect of impurity effect on ECW heating and current drive. The HL-2M Tokamak device parameters were combined with self-consistent coupled plasma equilibrium, external auxiliary heating and current drive, transport and other physical processes for simulation computation with the carbon ions as the unique impurity ions.
Results
The simulation results show that when the influence of impurities on the plasma is considered, with the increase of the impurity concentration, the radial position of the ECW deposition first moves to the plasma core and then moves to the edge, and the current drive efficiency first increases and then decreases. Due to the competition between the radiation effect and the dilution effect of the impurity-plasma interaction, the radiation loss power basically increases linearly with the increase of Z eff , while the dilution effect suppresses the turbulence and improve the confinement, but the stabilization effect slows down with the increase of Z eff .
Conclusions
When the influence of impurities on the plasma is not considered, the deposition position of ECW is basically unchanged, and the current drive efficiency decreases. Results of this study have guiding significance for electron cyclotron current drive (ECCD) to control the plasma current profile and control the instability of magnetic fluid.
作者机构：
[陈钊] China Nuclear Power Technology Research Institute Co., Ltd., Shenzhen, 518000, China;[赵鹏程; 彭梁兴; 肖英杰] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China
通讯机构：
[Zhao, P.] S;School of Nuclear Science and Technology, China
关键词：
环形燃料;径向功率分布;燃耗过程;栅元温度场;有效温度
摘要：
环形燃料可显著提高压水堆堆芯功率密度，对实现反应堆小型化设计和经济性提高具有重要意义。本研究为获得环形燃料栅元的有效温度计算方法，以西屋公司设计的环形燃料栅元为计算对象，开发了环形燃料单通道热工水力分析程序THCAFS（Thermal-Hydraulic Code of Annular Fuel with Single channel），建立了环形燃料栅元的有效温度的计算模型。基于THCAFS分析了西屋公司四环路压水堆所设计的环形燃料栅元的热工水力性能，并与VIPRE-01、TAFIX和NACAF的计算结果进行Code-to-Code对比验证。同时，利用蒙特卡罗程序SERPENT模拟燃料棒中径向功率分布和燃耗过程，通过自主开发程序THCAFS模拟燃料棒中的热力学行为，获得不同燃耗下的径向功率分布、核素密度变化和栅元温度场。结果表明：THCAFS可初步应用于环形燃料设计以及热工水力分析，且有效温度计算方法也可为相关环形燃料共振有效温度的机理性研究提供重要的参考性价值。 Background
The annular fuel can increase the power density of the reactor due to its double-sided cooling, which is of great significance to the miniaturization and long-life operation of the pressurized water reactor.
Purpose
This study aims at the calculation method of effective temperature of annular fuel cell by developing the thermal-hydraulic analysis code named THCAFS (Thermal-Hydraulic Code of Annular Fuel with Single channel) for annular fuel, and establishing a calculation model for the effective temperature of the annular fuel cell.
Methods
Based on THCAFS, the thermal-hydraulic performance of the annular fuel cell designed by Westinghouse 4-loop PWR was analyzed, and the Code-to-Code comparison was carried out with the calculation results of VIPRE-01, TAFIX and NACAF. At the same time, the Monte Carlo code SERPENT was employed to simulate the radial power distribution and burnup process in the fuel rod, and the self-developed code THCAFS was used to simulate the thermodynamic behavior in the fuel rod, and the radial power distribution, nuclide density change and cell temperature field.
Results & Conclusions
The results show that THCAFS can be preliminarily applied to annular fuel design and thermal-hydraulic analysis. The maximum deviation of the ratio between the fitting function power and the simulated power under different fuel consumption does not exceed 2%. This effective temperature calculation method can also provide important reference value for the mechanism study of the relevant annular fuel resonance effective temperature.
作者机构：
[胡少华; 周青芝; 李桂元; 王倩] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[胡少华; 周青芝; 李桂元; 王倩] 421001, China
摘要：
According to gauge/gravity duality, we use an Einstein-Maxwell-dilaton (EMD) model to study the running coupling constant at finite chemical potential and magnetic field. First, we calculate the effect of temperature on the running coupling constant and find the results are qualitatively consistent with lattice guage theory. Subsequently, we calculate the effect of chemical potential and magnetic field on running coupling. It is found that the chemical potential and magnetic field both suppress the running coupling constant. However, the effect of the magnetic field is slightly larger than that of chemical potential for a fixed temperature. Compared with the confinement phase, the magnetic field has a large influence on the running coupling in the deconfinement phase.
作者机构：
[Junjie Li; Xin Ling; Yong Deng; Fengbo Gu; Xiaohui Qi; Guopu Qu] School of Nuclear Science and Technology, University of South China, Hengyang, China;Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing, China;State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, CAS, Beijing, China;University of Chinese Academy of Sciences, Beijing, China;[Xiaoxue Fan] Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy, School of Nuclear Science and Engineering, North China Electric Power University, Beijing, China
通讯机构：
[Xilei Sun] I;[Guopu Qu] S;School of Nuclear Science and Technology, University of South China, Hengyang, China
摘要：
Radon is a noble gas, which endangers our health. The liquid scintillator is one of the detector materials used to measure radon in the environment. But there are challenges in measuring radon using a liquid scintillator, such as independent manual operation and long measurement periods. We propose a liquid scintillator detector for the rapid measurement of radon, which is composed of a breathable liquid scintillator probe and photomultiplier tube. Cascade decay recognition and pulse shape discrimination (PSD) were used to select radon events.
$$^{241}$$
Am4(
$$\alpha $$
) and
$$^{90}$$
Sr(
$$\beta $$
) source calibration was used to optimize the PSD figure of merit of the liquid scintillator, and a
$$^{232}$$
Th (
$$^{220}$$
Rn) diffusion source was used to verify the function of this novel detector for measuring radon. The detector had an integrated design for sampling and measurement, which simplified the measurement steps. Thus, this novel liquid scintillator detector demonstrated promise for use in radon-detection systems.
作者机构：
[Long-Fei Wang; Bang-Heng Lv; Feng-Tai Wu; Guo-Zhang Huang; Ze-Yu Ruan; Yan-Cong Chen; Zhao-Ping Ni; Ming-Liang Tong] Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, China;[Min Liu] School of Nuclear Science and Technology, University of South China, Hengyang, China
通讯机构：
[Ming-Liang Tong] K;Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, China
作者机构：
[李玥航; 于涛; 陈珍平] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[甘斌; 鲜希睿; 牛昊轩] Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu;610213, China;Hunan Provincial Digital Reactor Engineering Technology Research Center, Hengyang
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构：
[李琼; 刘紫静; 王维嘉; 赵鹏程; 于涛; 常浩彤] School of Nuclear Science and Technology, University of South China, Hunan, Hengyang;421001, China;Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hunan, Hengyang;[李琼; 刘紫静; 赵鹏程; 于涛] 421001, China<&wdkj&>Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hunan, Hengyang;[李琼; 刘紫静; 王维嘉; 赵鹏程; 于涛; 常浩彤] 421001, China
作者：
Li Chun-Yu;Hao Guang-Zhou;Liu Yue-Qiang;Wang Lian;Liu Yi-Hui-Zi
期刊：
物理学报,2022年71(7):256-264 ISSN：1000-3290
作者机构：
[Hao Guang-Zhou; Li Chun-Yu; Wang Lian] Southwestern Inst Phys, Chengdu 610041, Peoples R China.;[Liu Yue-Qiang] Gen Atom, San Diego, CA 92186 USA.;[Liu Yi-Hui-Zi] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
摘要：
铅铋反应堆广泛应用的需求要求研究人员在现有堆芯方案的基础上开展大量优化设计工作。针对铅铋反应堆多物理、多变量、多约束耦合影响的多维非线性约束优化设计问题，基于Kriging代理模型、正交拉丁超立方抽样和SEUMRE空间搜索技术构建铅铋反应堆智能优化方法，耦合物理蒙卡计算/热工分析程序，开发包含抽样、耦合程序前后处理、反应堆优化分析功能的优化平台，并以铅铋反应堆SPALLER-4，URANUS为原型分别开展最小燃料装载量的方案寻优与参数优化验证。验证结果表明，该智能优化方法用于铅铋反应堆设计方案寻优和堆芯参数优化可行、有效，相比传统蒙卡程序计算寻优，在保证预测精度前提下极大地降低了计算成本，与URANUS初始模型比较，燃料装载量、堆芯总质量、活性区体积、堆芯总体积分别优化10.8%，11.5%，18.1%，17.1%，为基于代理模型的智能优化方法应用于铅铋反应堆的优化设计提供参考。 The extensive application requirements of lead-bismuth reactors require researchers to carry out a lot of optimization design work on the basis of existing core schemes. Aiming at the multi-dimensional nonlinear constrained optimization design problem of lead-bismuth reactor with multi-physical, multi-variable and multi-constraint coupling effects, an intelligent optimization method for lead-bismuth reactor was constructed based on Kriging surrogate model, orthogonal Latin hypercube sampling and SEUMRE spatial search technology. Coupled with physical Monte Carlo calculation/thermal ranalysis code, an optimization platform including sampling, pre-and post-processing of coupling program and reactor optimization analysis function was developed. Taking SPALLER-4 and URANUS as prototypes, the scheme optimization and parameter optimization verification of minimum fuel load were carried out respectively. The verification results show that the core intelligent optimization method is feasible and effective for the optimization of lead-bismuth reactor design scheme and core parameters. Compared with the traditional Monte Carlo calculation optimization, the calculation cost is greatly reduced under the premise of ensuring the prediction accuracy. Compared with the URANUS initial model, the fuel loading, the total mass of the core, the volume of the active zone and the total volume of the core are optimized by 10.8%, 11.5%, 18.1% and 17.1% respectively, which provides a reference for the intelligent optimization method based on the surrogate model applied to the optimization design of lead-bismuth reactor.
