分类: 核科学技术 >> 核探测技术与核电子学 提交时间: 2024-05-21
摘要: The cooling storage ring (CSR) external-target experiment (CEE) is a spectrometer used in construction to study the properties of nuclear matter inhigh-baryon density regionsat the Heavy-Ion Research Facility in Lanzhou(HIRFL). This study presentsthe design, simulation, manufacturing,and testingof ahalf-size prototype of amulti-wire drift chamber (MWDC) for the CEE. First, theperformance of the MWDCconnected tohome-made electronics was simulated. The results demonstratedthat an energy resolution of 18.5% for 5.9-keVX-rays and a position resolution of 194 um for protons can be achieved bythe current design. Becausethe size of the largest MWDCreached176× 314 cm, a set of 98× 98 cm prototypes was built using the new techniques. The positioning accuracy of the anode wires inthis prototype exceeded20 um. After optimizationusing commercially available electronicdevices, the prototype achievedan energy resolution of 19.7% for a 55FeX-ray source. The CEE-MWDCdetector and electronics were simultaneouslytested. An energy resolution of 22% was achievedfor the 55Fesource;the track residuals were approximately330 umfor the cosmic rays. The results demonstrate that the current design and techniquesmeet the requirementsof the CEE-MWDCarray.
分类: 核科学技术 >> 辐射物理与技术 提交时间: 2024-04-04
摘要: The High Energy Fragment Separator (HFRS), which is currently under construction, is a leading international radioactive beam device. Multiple sets of position-sensitive Twin Time Projection Chamber (TPC)detectors are distributed on HFRS for particle identification and beam monitoring. The twin TPCs’ readoutelectronics system operates in a trigger-less mode due to its high counting rate, leading to a challenge of handling large amounts of data. To address this problem, we introduced an event-building algorithm. This algorithmemploys a hierarchical processing strategy to compress data during transmission and aggregation. In addition,it reconstructs twin TPCs’ events online and stores only the reconstructed particle information, which significantly reduces the burden on data transmission and storage resources. Simulation studies demonstrated that thealgorithm accurately matches twin TPCs’ events and reduces more than 98% of the data volume at a countingrate of 500 kHz/channel.
分类: 核科学技术 >> 核科学与技术 提交时间: 2023-11-06
摘要: HFRS (HIAF FRagment separator (HFRS) will be the radioactive secondary beam separation line on High-Intensity heavy-ion Accelerator Facility (HIAF) in China. Several TPC detectors, with high count rates, are planned for particle identification and beam monitoring at HFRS. This paper presents an event-driven internal memory and synchronous readout (EDIMS) prototype ASIC chip. The aim is to provide HFRS-TPC with high-precision time and charge measurements with high count rates and a large dynamic range. The first prototype EDIMS chip integrated 16 channels and is fabricated using a 0.18-um CMOS process. Each channel consists of a charge-sensitive amplifier, fast shaper, slow shaper, peak detect-and-hold circuit, discriminator with time-walk compensation, analog memory, and FIFO. The token ring is used for clock-synchronous readout. The chip is taped and tested.
分类: 物理学 >> 核物理学 提交时间: 2023-06-06
摘要: β衰变半衰期和β延迟中子发射(βn)在核物理和核能等基础科学和工业应用的发展中具有重要意义,其中β−衰变起着重要作用。许多理论模型已经被提出来描述β-衰变的半衰期,而对βn的系统研究仍然很少。本文旨在通过解析公式研究了β−-衰减半衰期和βn概率,并与实验数据进行了比较。通过考虑衰减能量、凹凸度和壳效应等主要因素,提出了β−-衰减性质的解析公式。采用自助法同时评价计算的总不确定性,由统计量和系统不确定性组成。评估了中子富区的β−-衰变半衰期、βn概率和相应的不确定性。实验中的半衰期被很好地再现了。更多的预测也提出了理论的不确定性,这有助于更好地理解实验结果和理论结果之间的差异