分类： 核科学技术 >> 辐射物理与技术 提交时间： 2024-04-19
Lu, Yudong
Zheng, Jinxing
Liu, Xufeng
Wu, Huan
Ge, Jian
Xu, Kun
Li, Ming
Liu, Haiyang
Zhu, Lei
Liu, Fei
摘要： The superconducting magnet system of a fusion reactor plays a vital role in plasma confinement, a processthat can be disrupted by various operational factors. A critical parameter for evaluating the temperature marginof superconducting magnets during normal operation is the nuclear heating caused by D-T neutrons. This studyinvestigates the impact of nuclear heating on a superconducting magnet system by employing an improvedanalysis method that combines neutronics and thermal hydraulics.In the magnet system, toroidal field (TF) magnets are positioned closest to the plasma and bear the highestnuclear-heat load, making them prime candidates for evaluating the influence of nuclear heating on stability.To enhance the modeling accuracy and facilitate design modifications, a parametric TF model that incorporatesheterogeneity is established to expedite the optimization design process and enhance the accuracy of the computations. A comparative analysis with a homogeneous TF model reveals that the heterogeneous model improvesaccuracy by over 12%. Considering factors such as heat load, magnetic-field strength, and cooling conditions,the cooling circuit facing the most severe conditions is selected to calculate the temperature of the superconductor. This selection streamlines the workload associated with thermal-hydraulic analysis. This approach enablesa more efficient and precise evaluation of the temperature margin of TF magnets. Moreover, it offers insightsthat can guide the optimization of both the structure and cooling strategy of superconducting magnet systems.
分类： 核科学技术 >> 核仪器、仪表 提交时间： 2023-06-01
Shi-Xing Liu
Wei Zhang
Zi-Han Zhang
Shuang Lin
Hong-Rui Cao
Cheng-Xin Song
Jin-Long Zhao
Guo-Qiang Zhong
摘要： 核安全防护通常需要同时探测中子和伽马射线，探测器的实时中子/伽马脉冲分辨是其关键性能参数。近年来，采用Cs2LiLaBr6 (CLLB)晶体的双读出探测器引起了广泛关注，论文研究电荷比较法、幅度比较法、时间比较法和脉冲梯度法的甄别性能，以及Sallen-Key滤波器的甄别效果。实验结果表明，通过合适的滤波，四种方法的品质因数(FOM)都有所提高。其中，电荷比较法抗噪声性能最佳，最适合CLLB探测器实时甄别中子/伽马脉冲。其甄别性能取决于参数、和。在对应脉冲峰值10%的时刻，，仅需延迟640-740 ns，此刻对应3.1-3.3 MeV的电荷比较方法最优FOM大于1.46。所提出的最大分辨差模型( MDDM)计算值与最优FOM的差异小于3.9%，表明该模型可以很好地指导电荷比较法的参数选择。
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