Nuclear Engineering and Technology最新文献_第7页

Establishment of screening levels for thyroid contamination assessment in adults following a nuclear accident 核事故后成人甲状腺污染评估筛查水平的建立

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-07 DOI: 10.1016/j.net.2025.104103

Kihoon Kim, Seokwon Yoon, Hyungwoo Nam, Minsu Cho, Minseok Park

Rapid screening for thyroid contamination is crucial for implementing radiation protection measures in affected populations. Direct thyroid measurements using handheld radiation instruments are primarily performed during the early phases of a nuclear accident owing to their immediate results and operational convenience. This study aimed to derive dose conversion factors to convert measurements from handheld radiation instruments into thyroid equivalent doses. Thyroid screening levels were established for the South Korean Radiation Emergency Medical System. Instrument counting efficiencies were determined using a physical thyroid phantom and radioactive materials. Dose conversion factors were then derived by integrating the counting efficiencies with ¹³¹I retention functions and thyroid equivalent dose coefficients, under various intake scenarios. Screening levels were established using the derived conversion factors in conjunction with recommendations from the International Atomic Energy Agency, accounting for the time elapsed since radioiodine intake. The effectiveness of these levels was experimentally validated under various conditions, including detector performance, distance, and positioning. The derived screening levels can be used for offsite thyroid contamination measurements, facilitating rapid screening and dose assessment during radiation emergencies. Further studies are warranted to improve applicability in pediatric populations and reduce uncertainties in the current measurement system.

快速筛查甲状腺污染对于在受影响人群中实施辐射防护措施至关重要。使用手持式辐射仪器的直接甲状腺测量主要是在核事故的早期阶段进行的，因为它们的结果立即且操作方便。本研究旨在推导剂量转换因子，将手持式辐射仪器的测量值转换为甲状腺当量剂量。为韩国辐射紧急医疗系统制定了甲状腺筛查水平。仪器计数效率测定使用物理甲状腺幻影和放射性物质。然后，通过将计数效率与131I保留函数和甲状腺等效剂量系数进行积分，得出了不同摄入情景下的剂量转换因子。筛查水平是结合国际原子能机构的建议，根据摄入放射性碘后的时间计算得出的换算系数确定的。在各种条件下，包括探测器性能、距离和定位，实验验证了这些水平的有效性。导出的筛选水平可用于场外甲状腺污染测量，促进辐射紧急情况下的快速筛选和剂量评估。进一步的研究是必要的，以提高在儿科人群的适用性，并减少不确定性，目前的测量系统。

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引用次数: 0

Seismic analyses of i-SMR CV supports employing a component mode synthesis technique 采用分量模态综合技术对i-SMR CV支承进行地震分析

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-09 DOI: 10.1016/j.net.2025.104072

Jun-Yeop Lee , Dong-Hyeon Choi , Yoon-Suk Chang

To ensure the safety of next-generation reactors, innovative design concepts and subsequent extensive engineering analyses are essential. However, recurrent modifications of major structures, systems and components require substantial resources for repeated evaluations. This study proposes an efficient component mode synthesis (CMS) technique tailored for a developing small modular reactor. First, the baseline seismic parameters of critical locations were calculated through conventional modal analysis (MA), response spectrum analysis and time history analysis (THA) corresponding to their original configuration. Secondly, benchmark MA and THA were performed using both Craig-Bampton and Hintz-Herting CMS techniques. Comparison with the reference analysis outcomes showed the superior suitability of the latter. Finally, four design alternatives were developed and analyzed using the Hintz-Herting CMS technique to determine the optimal structural arrangement of supports. The results demonstrated that the proposed technique significantly reduced computational time by more than 80 % while preserving dynamic fidelity.

为了确保下一代反应堆的安全，创新的设计理念和随后广泛的工程分析是必不可少的。但是，主要结构、系统和部件的反复修改需要大量资源进行反复评价。本研究提出了一种高效的组件模式合成（CMS）技术，该技术适用于正在开发的小型模块化反应堆。首先，通过常规模态分析（MA）、反应谱分析（response spectrum analysis）和时程分析（time history analysis， THA）计算出关键位置的基线地震参数。其次，使用Craig-Bampton和Hintz-Herting CMS技术进行基准MA和THA。与参考分析结果比较，后者的适宜性更强。最后，利用Hintz-Herting CMS技术，开发并分析了四种设计方案，以确定支撑的最佳结构布置。结果表明，该方法在保持动态保真度的同时，显著减少了80%以上的计算时间。

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引用次数: 0

Nano-to-micro aerosol contaminants emissions from dismantling of nuclear reactor pressure vessel using mock-up experiments 核反应堆压力容器拆解过程中纳米至微气溶胶污染物排放的模拟实验

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-11 DOI: 10.1016/j.net.2025.104081

Wonseok Yang , Joonsoo Ock , Kwangseo Kim , Samuel Park , Nakkyu Chae , Haewoong Kim , Kwangsoo Park , Min-Ho Lee , Sungyeol Choi

The decommissioning of nuclear power plants presents significant challenges due to the release of radioactive aerosols from contaminated or activated metal cutting, posing risks of internal radiation exposure. To protect workers, it is crucial to characterize aerosol generation and verify the performance of air purification systems. Although previous studies relied on lab-scale experiments, full-scale mock-up testing is necessary to validate under field conditions. This study conducted remote oxy-fuel cutting experiments on a mock-up reactor pressure vessel (RPV) to evaluate aerosol characteristics and filtration efficiency. The mock-up, simulating the upper shell of the Kori Unit 1 RPV, was enclosed within a shielding tent connected to a ventilation system. During thermal cutting, we confirmed a bimodal size distribution, with nanoparticles (<100 nm) comprising a significant fraction. Chemical analysis identified that aerosol contained the key elements of RPV materials such as iron, chromium, nickel, and manganese. Filtration efficiency of mock-up system exceeded 99.87 % for particles under 10 μm. However, the dose conversion factors for inhalation calculated from experimental data were up to 4.71 times higher than the ICRP-recommended values. These findings emphasize the importance of precise aerosol monitoring and respiratory protective equipment to enhance safety protocols in nuclear decommissioning.

由于受污染或活化的金属切割释放放射性气溶胶，造成内部辐射暴露的风险，核电厂的退役提出了重大挑战。为了保护工人，至关重要的是表征气溶胶的产生和验证空气净化系统的性能。虽然以前的研究依赖于实验室规模的实验，但在现场条件下进行全尺寸模型测试是必要的。本研究在模拟反应堆压力容器（RPV）上进行了远程氧燃料切割实验，以评估气溶胶特性和过滤效率。该模型模拟了Kori 1号机组RPV的上部外壳，被封闭在一个与通风系统相连的屏蔽帐篷内。在热切割过程中，我们证实了一个双峰尺寸分布，纳米颗粒（<100 nm）占很大比例。化学分析表明，气溶胶含有RPV材料的关键元素，如铁、铬、镍和锰。模拟系统对10 μm以下颗粒的过滤效率超过99.87%。然而，根据实验数据计算的吸入剂量转换系数比icrp推荐值高出4.71倍。这些发现强调了精确的气溶胶监测和呼吸防护设备对加强核退役安全协议的重要性。

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引用次数: 0

Physics-guided multi-task learning for predicting thermophysical properties of Ag-In-Cd absorber alloys with extremely small data 以极小数据预测Ag-In-Cd吸收合金热物理性质的物理引导多任务学习

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-02 DOI: 10.1016/j.net.2025.104061

Yi-Rui Hu , Xiaoya Wang , Zhaohe Gao , Hongxing Xiao , Hongsheng Chen , Jie Xiong

Machine learning (ML) techniques have recently shown great promise in advancing nuclear materials research. However, the application of ML in this field is often limited by the scarcity of experimental data due to the high cost and complexity of irradiation experiments. In this study, we propose a physics-guided multi-task neural network (PGMTNN) framework to accurately predict the thermophysical properties of Ag-In-Cd control rod alloys under neutron irradiation, using extremely limited datasets. The PGMTNN model incorporates fundamental physical laws as soft constraints within a multi-task learning architecture, enabling the simultaneous prediction of density, specific heat capacity, thermal diffusivity, and thermal conductivity. This approach effectively captures the intrinsic correlations among different material properties and ensures physical consistency of the predictions. Compared with traditional ML methods and the transformer-based foundation model, the PGMTNN demonstrates superior performance, achieving an average coefficient of determination exceeding 0.92 on the testing set. These results underscore the potential of physics-guided, multi-task ML frameworks for accurate property prediction and reliable design of advanced absorber materials under small-data conditions.

机器学习（ML）技术最近在推进核材料研究方面显示出巨大的希望。然而，由于辐照实验的高成本和复杂性，机器学习在这一领域的应用往往受到实验数据稀缺的限制。在这项研究中，我们提出了一个物理引导的多任务神经网络（PGMTNN）框架，以准确预测Ag-In-Cd控制棒合金在中子辐照下的热物理性质，使用极其有限的数据集。PGMTNN模型将基本物理定律作为多任务学习架构中的软约束，能够同时预测密度、比热容、热扩散率和导热系数。这种方法有效地捕获了不同材料特性之间的内在相关性，并确保了预测的物理一致性。与传统的机器学习方法和基于变压器的基础模型相比，PGMTNN表现出更好的性能，在测试集上的平均确定系数超过0.92。这些结果强调了物理指导的多任务机器学习框架在小数据条件下准确预测性能和可靠设计先进吸收材料的潜力。

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引用次数: 0

Simulation study on event positioning algorithm of fast neutron imaging detector based on scintillating fiber and SiPM array 基于闪烁光纤和SiPM阵列的快中子成像探测器事件定位算法仿真研究

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-24 DOI: 10.1016/j.net.2025.104101

Weikun Chen , Guoqiang Zhong , Bing Hong , Jian Liu

A miniaturized fast neutron imaging detector based on scintillating fiber (Sci-Fi) is designed to adopt a SiPM array as its photoelectric conversion component. The center of gravity (CoG) method, widely used for neutron event positioning, demonstrates limited effectiveness when applied to signals originating from the peripheral regions of the array. To address this issue, the present study conducted a simulation analysis of the light output distribution characteristics from both the Sci-Fi and the associated light guide using the Geant4 toolkit. The photon distribution functions fitted for various regions all exhibited correlation coefficients exceeding 0.99. Furthermore, this work categorized the deviations encountered during the operation of the imaging detector into three principal types: inherent deviations, hardware-induced deviations, and algorithmic deviations. Focusing on algorithmic deviations, scintillation photon events randomly distributed within the Sci-Fi array were simulated. An inversion method, developed based on the photon distribution function, employed an iterative computational approach to accurately determine event positions by optimizing the fit. Compared to the CoG method, the inversion technique achieves a reduction in average positional deviation by over 13 %, sustains robust positioning performance for events occurring near the array edges, enhances the effective utilization of the SiPM array, and is well-suited for applications demanding higher spatial resolution and an expanded field of view.

采用SiPM阵列作为光电转换元件，设计了一种基于闪烁光纤的小型化快中子成像探测器。重心（CoG）方法广泛用于中子事件定位，当应用于来自阵列外围区域的信号时，其有效性有限。为了解决这一问题，本研究使用Geant4工具包对科幻光导和相关光导的光输出分布特性进行了模拟分析。各区域的光子分布函数的相关系数均大于0.99。此外，本工作将成像探测器运行过程中遇到的偏差分为三种主要类型：固有偏差、硬件诱发偏差和算法偏差。针对算法偏差，模拟了随机分布在科幻阵列中的闪烁光子事件。提出了一种基于光子分布函数的反演方法，采用迭代计算的方法通过优化拟合来精确确定事件位置。与CoG方法相比，该反演技术将平均位置偏差降低了13%以上，对发生在阵列边缘附近的事件保持了稳健的定位性能，提高了SiPM阵列的有效利用率，非常适合要求更高空间分辨率和扩展视场的应用。

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引用次数: 0

Computational analysis of electrorefiner for oxide-reduced LWR spent fuel 氧化还原轻水堆乏燃料电精炼厂的计算分析

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-11-24 DOI: 10.1016/j.net.2025.104044

Jin-Mok Hur, Eunsoo Lee, Sangkwon Lee, Jae Soo Ryu

Electrorefining is a main unit process of pyroprocessing for the treatment of light-water reactor (LWR) spent fuel, where enhancing throughput is essential for practical deployment. This study presents a two-dimensional (2D) computational model to analyze anode dissolution, cathode deposition, and cathode scraping under realistic electrode configurations, considering the unique characteristics of electroreduction cathode baskets of pyroprocessing. Parametric simulations revealed that increasing the applied cell voltage greatly improved throughput, while raising the initial UCl₃ concentration had only a modest effect under the modeling conditions of this study. Electrode spacing required optimization between higher deposition rates at short gaps and longer scraping intervals at wider gaps. Undesirable uranium dendrite growth at the cathode tip was suppressed not only by insulating the cathode tip but also by adjusting the cathode length. The plate cathode exhibited a higher capacity for uranium deposition prior to scraping than the rod cathode. The application of parallel multi-electrode configurations was found to effectively increase electrorefiner throughput, and the gain was proportional to the number of facing electrode surfaces. The optimization results obtained for plate cathode-based parallel multi-electrode configurations provided valuable design guidance and are expected to contribute significantly to the practical deployment of pyroprocessing.

电精炼是轻水堆乏燃料热处理的主要单元工艺，提高处理能力对轻水堆乏燃料的实际应用至关重要。考虑到热处理电还原阴极篮的独特特性，本研究提出了一个二维计算模型来分析现实电极配置下的阳极溶解、阴极沉积和阴极刮擦。参数模拟表明，在本研究的建模条件下，增加施加的电池电压大大提高了吞吐量，而提高初始UCl3浓度只有适度的影响。电极间距需要在短间隙较高的沉积速率和较宽间隙较长的刮擦间隔之间进行优化。通过对阴极尖端进行绝缘处理和调整阴极长度，可以抑制阴极尖端铀枝晶的生长。在刮削前，板阴极表现出比棒阴极更高的铀沉积能力。平行多电极结构的应用可以有效地提高电精炼厂的吞吐量，并且增益与面对电极表面的数量成正比。基于平板阴极的并联多电极结构的优化结果提供了有价值的设计指导，并有望对热处理的实际部署做出重大贡献。

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引用次数: 0

Optimization of spent fuel reduction and reactivity control using LEU+ fuel and hybrid burnable absorbers in innovative small modular reactors 新型小型模块化反应堆中使用低浓铀+燃料和混合可燃吸收剂的乏燃料减量和反应性控制优化

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-03 DOI: 10.1016/j.net.2025.104059

Jinsun Kim , Se Yeon Hwang , Tae Sik Jung , Jooil Yoon

This study presents an advanced core design for the innovative small modular reactor (i-SMR), enabling fully soluble boron-free operation through optimized integration of hybrid burnable absorbers (BAs)—gadolinia (Gd₂O₃) and erbia (Er₂O₃)—with LEU + fuel. The design addresses the challenges of excess reactivity control and spent fuel minimization, both critical in boron-free SMR environments. Gadolinia provides strong initial reactivity suppression, while Er₂O₃ ensures gradual, sustained absorption, enabling long-cycle operation. LEU + fuel increases average discharge burnup from approximately 50,000 to 68,500 MWd/MTU, extending the cycle by over 33 % and reducing spent fuel assemblies by about 25 % over an 80-year lifetime— demonstrating significant improvements within the i-SMR design framework.

The design employs the PRAGMA/SPHINCS coupled code system, where PRAGMA performs continuous-energy Monte Carlo lattice calculations to generate homogenized few-group cross-sections, and SPHINCS carries out high-fidelity pin-by-pin diffusion simulations for full-core analysis. This coupled modeling framework accurately captures neutron flux distributions and burnup behavior inherent in hybrid burnable absorbers and high-enrichment LEU + fuel configurations. Evaluations confirm that key core safety parameters—including fuel temperature coefficient (FTC), moderator temperature coefficient (MTC), integrated temperature coefficient (ITC), and subcriticality margin—are satisfied throughout the cycle. The results show the i-SMR core achieves operational safety and sustainable spent fuel management, offering a robust, environmentally competitive solution for next-generation nuclear plants.

本研究提出了一种新型小型模块化反应堆（i-SMR）的先进核心设计，通过优化混合可燃吸收剂(BAs) -钆（Gd2O3）和铒(Er2O3) -与低浓铀+燃料的集成，实现了完全可溶无硼运行。该设计解决了过度反应性控制和乏燃料最小化的挑战，这在无硼SMR环境中都是至关重要的。钆提供了强大的初始反应性抑制，而Er2O3确保逐渐，持续吸收，实现长周期操作。低浓缩铀+燃料将平均排放燃耗从大约50,000 MWd/MTU增加到68,500 MWd/MTU，在80年的使用寿命中，将循环时间延长了33%以上，并减少了约25%的乏燃料组件，这表明了i-SMR设计框架的重大改进。该设计采用PRAGMA/SPHINCS耦合代码系统，其中PRAGMA执行连续能量蒙特卡罗晶格计算以生成均匀化的少群截面，SPHINCS执行高保真的逐引脚扩散模拟以进行全核分析。该耦合建模框架准确地捕获了混合可燃吸收剂和高富集低浓铀+燃料配置中固有的中子通量分布和燃耗行为。评估确认关键核心安全参数，包括燃料温度系数（FTC）、慢化剂温度系数（MTC）、综合温度系数（ITC）和亚临界余量，在整个循环过程中都得到满足。结果表明，i-SMR堆芯实现了运行安全性和可持续的乏燃料管理，为下一代核电站提供了一个强大的、具有环境竞争力的解决方案。

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引用次数: 0

Sandstone-type uranium mineralization coupled with extensional tectonics 砂岩型铀矿化与伸展构造相耦合

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-09 DOI: 10.1016/j.net.2025.104075

Bocheng Zhang , Zhibing Feng , Fengjun Nie , Chunlian Wang , Fei Xia , Li Jiang , Tengfei Ren , Jingyi Wang

While compressional tectonics has long been recognized as a significant factor in uranium mineralization, the role of extensional tectonics remains comparatively understudied. This investigation analyzes representative sandstone-hosted uranium provinces, including the Colorado Plateau (North America), the Agadez region (West Africa), the North China–Transbaikal region (Northeast Asia), and the Massif Central (Western Europe). Our systematic analysis reveals that extensional tectonics, building upon pre-existing rifting structures, amplify tectono-magmatic activity, which in turn exerts spatiotemporally control on uranium deposition and gives rise to diverse mineralization ages. Key structural elements within tectonic transition zones, such as uplifts, fault systems, and volcanism, play critical roles: uplifts and shallow-level faults govern the recharge and migration of supergene fluid, whereas deep-seated faults facilitate the transport of reductants (e.g., hydrocarbons) and magma. These deep pathways provide the essential thermal energy and additional components for uranium precipitation. Collectively, these processes collectively form high-relief transition zones that act as prime sites for uranium enrichment. In addition, multi-phase extensional events generate permeable conduits and thermal anomalies that are crucial for mobilizing and concentrating uranium from source rocks. This study provides an enhanced understanding of the genesis of sandstone-hosted uranium deposits and offers a theoretical framework for future exploration targeting.

虽然挤压构造长期以来被认为是铀矿化的重要因素，但伸展构造的作用研究相对较少。本研究分析了具有代表性的砂岩含铀省份，包括科罗拉多高原（北美）、阿加德兹地区（西非）、华北-外贝加尔地区（东北亚）和中部地块（西欧）。系统分析表明，在原有裂陷构造的基础上，伸展构造放大了构造-岩浆活动，从而对铀矿沉积产生时空控制作用，形成了不同的成矿年龄。构造过渡带中的关键构造要素，如隆升、断裂系统和火山作用，起着至关重要的作用：隆升和浅层断裂控制着表生流体的补给和运移，而深层断裂则促进还原剂（如碳氢化合物）和岩浆的输送。这些深层途径为铀沉淀提供了必需的热能和额外的成分。总的来说，这些过程共同形成了高起伏过渡区，作为铀浓缩的主要场所。此外，多期张拉事件会形成渗透管道和热异常，这对从烃源岩中动员和富集铀至关重要。该研究加深了对砂岩型铀矿床成因的认识，并为今后的找矿目标提供了理论框架。

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引用次数: 0

Enhancing SEU tolerance efficacy in advanced FinFET FPGA devices using system-level fine-grained spatial redundancy techniques 利用系统级细粒度空间冗余技术增强先进FinFET FPGA器件的SEU容差效率

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-04 DOI: 10.1016/j.net.2025.104047

Chang Cai , Hong-Jie Zeng , Ze-Qi Huang , Xue-Zhi Zheng , Yi Sun , Jing Zhang , Min-Chi Hu , Han-Tao Jing , Zhi-Xin Tan , Rui-Rui Fan , Jun Ge , Shu-Sheng Pan

This paper investigates the Single Event Upset (SEU) sensitivity, system-level hardening effectiveness, and potential applications of high-performance 16 nm Field Programmable Gate Arrays (FPGAs) in radiation environments. Representative circuits incorporating flip-flops and configured arithmetic logic units were specifically designed using FPGA internal resources. This integration introduces extra upset errors due to the additional utilization of arithmetic logics, contributing to a better understanding of SEU sensitivity in FPGA-based circuits within actual application designs. The irradiation tests were conducted to evaluate the SEU sensitivity of D flip-flops (DFFs) and Configuration Memories (CRAMs) under various application conditions. The results indicate that Fine-Grained (FG) Triple Modular Redundancy (TMR) circuits play a critical role in achieving high SEU tolerance, whereas general TMR hardening circuits often prove ineffective in most experiments, even with triplicated flip-flops. FG TMR circuits were developed to address the limitations of general TMR circuits, achieving SEU tolerance improvements by three orders of magnitude for output protection. Notably, FG TMR circuits showed no global signal-induced failures during proton irradiation tests. Furthermore, these system-level radiation tolerance designs present promising applications for Commercial Off-The-Shelf (COTS) devices in spaceflight and ground accelerator facility.

本文研究了高性能16nm现场可编程门阵列（fpga）在辐射环境中的单事件扰动（SEU）灵敏度、系统级硬化效率和潜在应用。利用FPGA内部资源，设计了包含触发器和配置算术逻辑单元的代表性电路。由于算术逻辑的额外利用，这种集成引入了额外的干扰误差，有助于在实际应用设计中更好地理解基于fpga的电路中的SEU灵敏度。通过辐照试验，评价了D触发器（dff）和组态存储器（cram）在不同应用条件下的SEU敏感性。结果表明，细粒度（FG）三模冗余（TMR）电路在实现高SEU容限方面发挥了关键作用，而一般的TMR硬化电路在大多数实验中往往被证明是无效的，即使是三次触发器。FG TMR电路的开发是为了解决一般TMR电路的局限性，实现了输出保护的SEU容差提高了三个数量级。值得注意的是，在质子辐照测试中，FG TMR电路显示没有全局信号诱导故障。此外，这些系统级辐射容限设计为航天和地面加速器设施中的商用现货（COTS）设备提供了有前途的应用。

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引用次数: 0

Curvature-induced singularities and stability analysis of curved perfectly matched layers for ICRF antenna–plasma coupling ICRF天线-等离子体耦合中弯曲完美匹配层的曲率诱导奇异性及稳定性分析

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-24 DOI: 10.1016/j.net.2025.104098

Wentao Geng, Donghui Xia, Xinyu Fang, Zhangsheng Huang, Yonghua Ding

In electromagnetic modeling of ion cyclotron range of frequencies (ICRF) antennas, curved coupling models provide a more realistic representation of the antenna and edge-plasma geometry, improving the accuracy of wave-coupling and loading predictions. However, limited radial space near the plasma boundary constrains the implementation of curved perfectly matched layers (PMLs), and field singularities may arise under such confined conditions. To investigate this issue, an idealized curved-domain model was formulated to analyze how curvature and the stretching function influence PML behavior. An analytical expression for the fast-wave reflection coefficient was derived and compared with finite-element simulations, which verified the analytical trends and revealed localized field enhancements associated with curvature and steep stretching. Building on these results, two-dimensional antenna–plasma coupling models incorporating J-TEXT–relevant parameters were used to evaluate PML performance under realistic spatial constraints. Planar models were also analyzed for reference. The 2D simulations show that stable absorption and smooth field distributions are maintained when the radial PML thickness lies within 0.12–0.13 m and the poloidal and toroidal PML spans satisfy θ_PMLp > 0.3 rad and θ_PMLt > 0.12 rad, with less than 2 % variation in coupled power. These results provide practical reference values for configuring curved PMLs in fusion-relevant electromagnetic simulations.

在离子回旋加速器频率范围（ICRF）天线的电磁建模中，弯曲耦合模型提供了更真实的天线和边缘等离子体几何形状的表示，提高了波耦合和负载预测的准确性。然而，等离子体边界附近有限的径向空间限制了弯曲完美匹配层（pml）的实现，在这种受限条件下可能会产生场奇点。为了研究这一问题，建立了一个理想化的曲线域模型来分析曲率和拉伸函数对PML性能的影响。推导了快波反射系数的解析表达式，并与有限元模拟结果进行了比较，验证了解析趋势，揭示了曲率和陡坡拉伸相关的局部场增强。在此基础上，采用包含j - text相关参数的二维天线-等离子体耦合模型来评估现实空间约束下PML的性能。并对平面模型进行了分析，以供参考。二维仿真结果表明，当径向PML厚度在0.12 ~ 0.13 m范围内，极向和环向PML跨度分别满足θPMLp >； 0.3 rad和θPMLt >； 0.12 rad时，耦合功率变化小于2%，吸收稳定，场分布平滑。这些结果为在与聚变相关的电磁仿真中配置弯曲pml提供了实用的参考价值。

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引用次数: 0