分类： 物理学 >> 核物理学 提交时间： 2024-04-28
摘要： The high-intensity heavy-ion accelerator facility (HIAF) is a scientific research facility complex composed ofmultiple cascade accelerators of different types, which pose a scheduling problem for devices distributed overa certain range of 2 km, involving over a hundred devices. The White Rabbit (WR), a technology-enhancingGigabit Ethernet, has shown the capability of scheduling distributed timing devices but still faces the challengeof obtaining real-time synchronization calibration parameters with high precision. This study presents a calibra#2;tion system based on a time-to-digital converter implemented on an ARM-based System-on-Chip (SoC). Thesystem consists of four multi-sample delay lines, a bubble-proof encoder, an edge controller for managing datafrom different channels, and a highly effective calibration module that benefits from the SoC architecture. Theperformance was evaluated with an average RMS precision of 5.51 ps by measuring the time intervals from 0to 24000 ps with 120000 data for every test. The design presented in this study refines the calibration precisionof the HIAF timing system. This eliminates the errors caused by manual calibration without efficiency loss andprovides data support for fault diagnosis. It can also be easily tailored or ported to other devices for specificapplications and provides more space for developing timing systems for particle accelerators, such as whiterabbits on HIAF.
分类： 物理学 >> 核物理学 提交时间： 2023-06-24
Wang, Yongsheng
Huang, Wenxue
Tian, Yulin
Wang, Junying
Li, Cheng
Zhang, Fengshou
Zhao, Kai
Zhou, Xiaohong
Xu, Hushan
摘要： The multinucleon transfer (MNT) reaction is one promising way to produce neutron-rich heavy nuclei and even super heavynuclei and attracts more and more attentions theoretically and experimentally. A low energy nuclear structure spectrometer calledLENSHIAF specific to the MNT reactions will be designed and constructed in the ongoing big project HIAF in China. In theLENSHIAF spectrometer, the most challenge part is how to collect and stop efficiently the high-energy MNT products into the gascell. By using Monte-Carlo method, the geometry of the gas cell, the thickness of the titanium window/degrader, and the optimalgas pressure filled in the gas cell have been calculated and estimated. For neutron-rich nuclei around N=126 from 136Xe+198Ptreaction, with a titanium window/degrader with a thickness of 2.53.5 um, a cylindrical helium gas cell with a length of 0.6 m and adiameter of 1.2 m can satisfy the requirements to stop the target-like fragments. For heavier and super heavy nuclei from 238U+238Ureaction, with a 58 um thick titanium window/degrader, the cylindrical gas cell has to be as big as a length of at least 1.6 m and adiameter of 1.6 m.
分类： 物理学 >> 核物理学 提交时间： 2023-09-11
摘要： 本工作制作了一套由快发光塑料闪烁体耦合快光电倍增管组成的塑料闪烁体飞行时间探测器的样机，通过皮秒脉冲激光测试了探测器的时间性能，旨在为将来的 HIAF-HFRS 飞行时间探测器作预研。对于两种不同尺寸的塑闪探测器，通过改变激光的光斑大小、频率、光强和位置等各项参数来模拟真实束流的情况，并使用 CAEN-DT5742 数字化仪以及 Mesytec-MCFD16+MTDC32 电子学系统进行了系统的测试。使用聚焦激光照射在塑闪中心位置时，小尺寸 (7 cm7 cm) 塑闪探测器的 ToF 分辨最好可达 8 ps；小-大 (26 cm10 cm) 塑闪探测器的 TOF 分辨最好可达到 12 ps。在改变激光各项参数后，得到的响应时间分辨为 1016 ps 和 1946 ps。测试结果表明，所得到的 ToF 分辨满足 HFRS 束线的时间分辨性能要求，为飞行时间探测器的优化奠定了基础。
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