分类： 物理学 >> 核物理学 提交时间： 2024-06-11
Yu-Ning Yang
Fang Yan
Zi-Hao Wang
Xiang-Yu Tan
Wen-Jie Wu
Xiang-Rong Fu
Jun Lei
Guo-Ping Lin
Gang Xu
Wei-Min Pan
摘要： 高能光子源 （HEPS） 对存储环板的振动水平有严格的限制。如果振动水平超过规格限值，会影响设备的正常运行，影响实验终端的采样效率。随着周边城市基础设施建设的不断扩大，为了控制外部振动源，有必要研究HEPS场地的振动传播特性。为了评估外部振动对HEPS关键组件的影响，已经进行了一系列测量。振动台用于人工生成频率为 7Hz 至 100 Hz 的垂直正弦激励。沿裸露地面测量振动响应，分析不同频率的振动衰减。根据测量数据的拟合结果，得到衰减公式和关键参数范围。同时，通过在HEPS现场行驶的50吨起重机的振动数据验证了衰减公式。测量数据与上述拟合公式非常吻合。测量数据与拟合曲线之间的差异在 $35 %$ 以内。本研究将为HEPS校园周边外部行驶载荷的相关调控奠定基础，同时为地面振动传播的研究方法提供参考。
分类： 物理学 >> 核物理学 提交时间： 2024-05-20
摘要： Tritium, a radioactive nuclide discharged by nuclear power plants, poses challenges for removal. Continuous online monitoring of tritium in water is crucial for real-time radiation data, given its predominant existence in the environment as water. This paper presents the design, simulation, and development of a tritium monitoring device utilizing a plastic scintillation fiber (PSF) array. Experimental validation confirmed the device’s detection efficiency and minimum detectable activity. The recorded detection efficiency of the device is 1.6 × 10−3 , which exceeds the theoretically simulated value of 4 × 10−4 by four times. Without shielding, the device can achieve a minimum detectable activity of 3165 Bq L−1 over a 1600-second measurement duration. According to simulation and experimental results, enhancing detection efficiency is possible by increasing the number and length of PSFs and implementing rigorous shielding measures. Additionally, reducing the diameter of PSFs can also improve detection efficiency. The minimum detectable activity of the device can be further reduced using the aforementioned methods.
分类： 核科学技术 >> 核科学与技术 提交时间： 2024-03-08
摘要： Various electromagnetic signals are excited by the beam in the acceleration and beam-diagnostic elements of a particle accelerator. It is important to obtain time-domain waveforms of these signals with high temporal resolution for research, such as the study of beam-cavity interactions and bunch-by-bunch parameter measure#2;ments. Therefore, a signal reconstruction algorithm with ultrahigh spatiotemporal resolution and bunch phase compensation based on equivalent sampling is proposed in this paper. Compared with traditional equivalent sampling, the use of phase compensation and setting the bunch signal zero-crossing point as the time reference can construct a more accurate reconstructed signal. The basic principles of the method, simulation, and experi#2;mental comparison are also introduced. Based on the beam test platform of the Shanghai Synchrotron Radiation Facility (SSRF) and the method of experimental verification, the factors that affect the reconstructed signal qual#2;ity are analyzed and discussed, including the depth of the sampled data, quantization noise of analog-to-digital converter (ADC), beam transverse oscillation, and longitudinal oscillation. The results of the beam experiments show that under the user operation conditions of the Shanghai Synchrotron Radiation Facility (SSRF), a beam excitation signal with an amplitude uncertainty of 2% can be reconstructed.
点击量
待评议
点击量
下载量
评论
通过
