Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-07-23
Abstract： Common radioactive aerosol monitors are often not portable and are difficult to deploy quickly, which means they cannot meet the needs of nuclear emergency response. [Purpose]: This study aims to develop a robust and compact portable radioactive aerosol monitor. And it can carry out real-time measurement and remote monitoring to realize the function of identification and analysis of nuclides. [Methods]:This monitor utilises 3D printing technology to design a unique housing and gas path structure, employs an anticoincidence detector, and uses an Artery ultra-high performance microcontroller for signal acquisition via a two-channel energy discrimination method. Based on the Intel HD Graphics processor, the monitor processes and analyses the signal using the α/β ratio method, snip de-localisation method, and second derivative peak search method to achieve accurate measurement and identification and analysis of nuclides. [Results]: The theoretical detection limit for α and β of the monitor are 0.72 Bq/m³ and 1.71 Bq/m³, respectively. The monitor demonstrates excellent stability and detection efficiency. [Conclusions]: The monitor can be deployed on unmanned inspection robots and drones, offering significant advantages for real-time monitoring and emergency response. This capability ensures adaptability to various scenarios involving radioactive aerosols, enhancing both efficiency and responsiveness in critical situations.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-07-21
Abstract：页岩是页岩气形成的物质基础，页岩岩性复杂、矿物成分变化大，依靠常规测井资料进行储层评价具有挑战性。FLex测井技术测量快中子与地层元素作用产生的γ射线能谱，通过解谱分析后获得地层的元素含量与矿物成分，从岩石化学成分角度为非常规储层的岩性评价开辟了一条新的道路。利用FLex元素测井岩石矿物解释模型对页岩岩相进行识别和划分，对页岩储层的脆性进行定量评价。研究表明，龙马溪组以硅质页岩为主，具有脆性矿物发育，黏土含量较低的特点，龙马溪组页岩可压性中等，具有一定的储层改造潜力，元素测井技术在页岩储层品质和可压性评价应用前景广泛。
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-07-19
Abstract： Abstract Objective To explore the application value of shear wave elastography (SWE) technology in evaluating the severity of liver cirrhosis. Method The study included 130 patients with liver cirrhosis in our hospital from March 2019 to June 2022, and cirrhosis grading was evaluated using the Child Pugh method. The liver hardness and Young's modulus were measured with SWE technology. Meanwhile, Liver function index and serum fibrosis index were detected by laboratory technology. Pearson correlation analysis and statistical methods were employed to analyze the correlation between SWE parameters and the severity of liver cirrhosis. Results demonstrate that there are significant differences in liver hardness and Young's modulus among patients with different Child Pugh grades (P<0.05), and these indicators showed an increasing trend with the increase of Child Pugh grades. In addition, there is a high correlation between liver hardness and SWE parameters and the cirrhosis grading, liver function, and liver fibrosis, indicating that SWE technology has important reference value in the evaluation of liver cirrhosis. Conclusion The parameters of SWE are closely related to the severity of liver cirrhosis, providing an effective tool for non-invasive evaluation of liver cirrhosis. The results of this small sample study suggest that SWE technology has potential clinical application value in assessing the severity of liver cirrhosis. In the future, we will expand the sample size and explore the diagnostic efficacy of SWE technology in different subgroups of liver cirrhosis.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-07-12
Abstract： [Background]: In nuclear radiation detection, detectors that output microcurrents commonly use the ADA4530 chip, designed and manufactured by Analog Devices, Inc. (ADI), to construct transimpedance amplifier circuits for measuring microcurrent signals. [Purpose]:To address the issue of dependency on foreign technology in the field of weak current measurement and to achieve the goal of designing weak current amplification circuits using entirely domestic components. [Methods]:The circuit design uses entirely domestic components and is based on the I-V conversion method for transimpedance amplification. [Results]: After careful design considerations and the selection of domestic components, a microcurrent transimpedance amplifier circuit with an output voltage range of 0 to 10V was successfully constructed. [Conclusions]:Testing showed that with a feedback resistor of 100GΩ, the linear fit for an input current of 0.1 to 100pA had an R2value of 0.99998, a relative deviation of less than 0.235%, and a noise peak-to-peak value of 0.057pA. When the feedback resistor is 10GΩand the input current is 1pA, the temperature drift over a range of -10℃to 80℃ is less than 0.042pA/℃. When the feedback resistor is 10GΩand the input is left floating, the output drift is less than 0.2662pA during a 6-hour stability test at room temperatu
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-07-09
Abstract： [Background]: In nuclear radiation detection, detectors that output microcurrents commonly use the ADA4530 chip, designed and manufactured by Analog Devices, Inc. (ADI), to construct transimpedance amplifier circuits for measuring microcurrent signals. [Purpose]:To address the issue of dependency on foreign technology in the field of weak current measurement and to achieve the goal of designing weak current amplification circuits using entirely domestic components. [Methods]:The circuit design uses entirely domestic components and is based on the I-V conversion method for transimpedance amplification. [Results]: After careful design considerations and the selection of domestic components, a microcurrent transimpedance amplifier circuit with an output voltage range of 0 to 10V was successfully constructed. [Conclusions]:Testing showed that with a feedback resistor of 100GΩ, the linear fit for an input current of 0.1 to 100pA had an R2value of 0.99998, a relative deviation of less than 0.235%, and a noise peak-to-peak value of 0.057pA. When the feedback resistor is 10GΩand the input current is 1pA, the temperature drift over a range of -10℃to 80℃ is less than 0.042pA/℃. When the feedback resistor is 10GΩand the input is left floating, the output drift is less than 0.2662pA during a 6-hour stability test at room temperatu
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-07-04
Abstract： [Background]: Accurate localization of radioactive material is essential for finding "orphan sources", decontaminating and decommissioning nuclear facilities, and optimizing radiation protection. Silicon Photomultiplier (SiPM) has been widely used in scintillator detection systems. [Purpose]: To realize a low-cost large-field-of-view high-resolution detection system, a mixed-mode readout circuit combining a resistive network, a preamplifier circuit and an ASIC module is designed and verified. [Methods]: Firstly, by changing the rising edge, falling edge, pulse width and amplitude of the input pulse, the requirements of the A5202 module on the input pulse are experimentally measured to achieve the best data acquisition performance. When the rise time of the input pulse is less than 150ns and the amplitude is greater than 20mV, the data measured by the A5202 module has less noise and higher energy resolution. Then simulation is carried out by Multisim software. This simulation analyzes in detail the relationship between the resistor resistance and the rise time of the output signal. It determines the optimum resistor resistance value for the symmetric charged division circuit. The rise time of the output signal is relatively minimized when the resistance value of the first stage shunt resistor is 1 kOhm and the resistance value of the second stage shunt resistor is 100 ohms. Finally, in order to simultaneously take into account the characteristics of the output signal of the symmetric charged division circuit and the requirements of the A5202 module for the input signal, an inverse proportional operational amplifier circuit with the AD8066ARZ chip as the core is designed. It is used to connect the A5202 module and the symmetric charged division circuit. After the scintillator detection system was assembled, the stability of the system was examined, then the RMS noise of the system was measured, and finally the positioning accuracy of the system was examined. In order to improve the robustness of localization, the localization threshold was first calibrated with a single LYSO. The LYSO was further replaced with an array of Cerium-doped Gadolinium Aluminum Gallium Garnet (GAGG(Ce)) crystals and the calibration results were examined with a 241Am source. [Results]: The test results show that the readout circuit has an RMS noise of about 3 mV, retains the energy and position information of the signal well, and has an average energy resolution of about 12.13%. [Conclusions]: The readout circuit designed in this paper simplifies the 64-channel SiPM signal into 4 channels, and reduces the number of detector output signal channels by 16 times. A single ASIC module can read out 1024 SiPMs at the same time, which can greatly reduce the cost of readout for large-area SiPM arrays.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-07-04
Abstract： Cosmic-ray muons are highly penetrating background-radiation particles found in natural environments. In this study, we develop and test a plastic scintillator muon detector based on machine-learning algorithms. The detector underwent muon position-resolution tests at the Institute of Modern Physics in Lanzhou using a mul tiwire drift chamber (MWDC) experimental platform. In the simulation, the same structural and performance parameters were maintained to ensure the reliability of the simulation results. The Gaussian process regression (GPR) algorithm was used as the position-reconstruction algorithm owing to its optimal performance. The re sults of the Time Difference of Arrival algorithm were incorporated as one of the features of the GPR model to reconstruct the muon hit positions. The accuracy of the position reconstruction was evaluated by comparing the experimental results with Geant4 simulation results. In the simulation, large-area plastic scintillator detectors achieved a position resolution better than 20 mm. In the experimental-platform tests, the position resolutions of the test detectors were 27.9 mm. We also analyzed factors affecting the position resolution, including the crit ical angle of the total internal reflection of the photomultiplier tubes and distribution of muons in the MWDC. Simulations were performed to image both large objects and objects with different atomic numbers. The results showed that the system could image high- and low-Z materials in the constructed model and distinguish objects with significant density differences. This study demonstrates the feasibility of the proposed system, thereby providing a new detector system for muon-imaging applications.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-06-28
Abstract： Abstract Background : Radioactivity measurement is widely used in various fields of nuclear technology application. The measurement uncertainty, confidence interval and detection limit are important parameters of radioactivity measurement. Different calculation methods may get different results, and the calculation results directly affect some important and relevant decisions. Purpose : It is important to analyze whether the calculation method is used properly. Methods : The important parameters of α particle activity concentration measurement were studied by partial derivative method and Monte Carlo method. In this study, based on the measurement of α activity concentration, the sources of uncertainty for the measurement results were analyzed. The measurement uncertainty, confidence limits, decision threshold and detection limit of α particle activity concentration under different input modes were derived and calculated by partial derivative and MC methods. Results : The results show that when the input uncertainty is higher than 10%, the relative deviation between confidence interval and uncertainty results obtained by the two calculation methods is greater than 15%. When the relative uncertainty of the input is small, the detection limit is about 2 times of the decision threshold. Conclusions : The partial derivative method is widely used, but it does not consider the probability distribution of the input, and it is not suitable for complex and special input models. Under the circumstances, Monte Carlo method can be used to obtain more reliable calculation results. The two approaches can be applied in complementary ways.
Peer Review Status:
Awaiting Review
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-06-28
Abstract： [Background] There is an efficiency loss in calculating the detection efficiency of CdZnTe detector using the traditional Monte Carlo method. [Purpose] Calculate the efficiency of CdZnTe detectors using sourceless efficiency calibration technique. [Methods] A method for calculating the detection efficiency of CdZnTe based on the ideal model (only considering the interaction between photons and the detector crystal and structural materials) was proposed. [Results] A 152Eu standard source sample was used to verify the reliability of the calculation method, the results show that the deviation between the calculated results and the reference values is less than 5%. [Conclusions] This method does not need to consider the complex process of incomplete carrier collection in CdZnTe crystal, and can obtain reliable efficiency calculation results by simple operation process.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-06-25
Abstract： X-ray detectors show potential applications in medical imaging, materials science, and nuclear energy. To achieve high detection efficiency and spatial resolution, many conventional semiconductor materials, such as amorphous selenium, cadmium telluride zinc, and perovskites have been utilized in direct conversion X-ray detectors. However, these semiconductor materials are susceptible to temperature-induced performance degra-dation, crystallization, delamination, uneven lattice growth, radiation damage, and high dark current. This study explores a new approach by coupling an FC40 electronic fluorinated liquid with a specialized high-resolution and high-readout-speed complementary metal-oxide-semiconductor (CMOS) pixel array, specifically the Top-metal II− chip, to fabricate a direct conversion X-ray detector. The fluorinated liquid FC40 (molecular formula: C21F48N2) is an electronic medium that is minimally affected by temperature and displays no issues with uniform conductivity. It exhibits a low dark current and minimal radiation damage and enables customizable thickness in X-ray absorption. This addresses the limitations inherent in conventional semiconductor-based de-tectors. In this study, simple X-ray detector imaging tests were conducted, demonstrating the excellent coupling capability between FC40 electronic fluorinated liquid and CMOS chips by the X-ray detector. A spatial reso-lution of 4.0 lp/mm was measured using a striped line par card, and a relatively clear image of a cockroach was displayed in the digital radiography imaging results. Preliminary test results indicated the feasibility of fabricating an X-ray detector by combining FC40 electronic fluorinated liquid and CMOS chips. Owing to the absence of issues related to chip-material coupling, a high spatial resolution could be achieved by reducing the chip pixel size. This method presents a new avenue for studies on novel liquid-based direct conversion X-ray detectors.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-06-03
Abstract： [Background] As one of the main radionuclides released into the environment by the operation of reactors and accelerators, the measurement of 41Ar activity concentration is of great significance for ensuring public health. In the field of radioactive gas measurement, the β-γ coincidence method is widely used because it can significantly reduce the background and improve the sensitivity of the detector. However, at present, there is little study on β-γ coincidence detectors for 41Ar measurement. [Purpose] In order to realize high sensitivity measurement of 41Ar, a detector composed of plastic scintillator and CsI(Tl) scintillator is designed, and an optimization method of detector structure based on minimum detectable activity concentration (MDC) is proposed. [Methods] The optimization process of the detector is realized based on Geant4 simulation. Firstly, the energy deposition of β-rays in CsI(Tl) with different thicknesses of BC404 was simulated. Secondly, the peak efficiency of 1293.6 keV γ-ray in CsI(Tl) scintillator with different thicknesses was simulated. Thirdly, assuming that the sampling time of argon is proportional to the volume of the detector’s gas chamber, by simulating with different gas chamber volume, the comprehensive effects of β detection efficiency, γ peak efficiency, gas chamber volume and sampling time on MDC were analyzed. Finally, the influence of measurement time on MDC under different background counting rates was analyzed. [Results] It is concluded that the particle number percentage of the energy deposited by 41Ar decay β-rays in CsI(Tl) is about 0.74% when the thickness of BC404 is 3 mm. The γ peak efficiency increases with the increase of CsI(Tl) scintillator thickness. With the argon sampling rate of 600 mL/h, the optimal detector size parameters that minimize MDC are completely determined. When the background count rate is 1×10-3 ~1 cps, the recommended measurement time for 41Ar is about 200 minutes. [Conclusions] When the measurement time is 200 minutes, the sample cooling time is 30 minutes and the background count rate is 5×10-3 cps, the MDC of the optimized β-γ coincidence detector for 41Ar measurement is about 1.7 Bq/m3.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-27
Abstract： Shielding material is critical for downhole pulsed neutron tool design as it directly influences the accuracy of formation measurements. A well-designed shield configuration ensures that the response of the tool is maximally representative of formation without being impacted by tool and borehole environment. This manuscript investigates the effects of boron-containing materials on neutron and gamma detectors based on a newly designed logging-while-drilling tool, which is currently undergoing manufacturing process. As boron content increases, its ability to absorb thermal neutrons significantly enhances. Through simulation, it is proven that boron carbide (B4C) can be used as an effective boron shielding material for thermal neutrons and therefore employed in this work. To shield against thermal neutrons migrating from mud pipes, the optimal shielding thicknesses for near and far neutron detectors are determined to be 5mm and 4mm. For an example, at a porosity of 25 p.u., the near neutron sensitivity shows a 5.6% increase in response. Furthermore, in order to shield capture gamma generated by thermal neutrons once they enter tool from the mud pipe and formation, the internal and external shields for the gamma detector is evaluated. Results show internal shield needs 75% boron content while the external shield is of 14.2mm thickness and 25% boron content to minimize tool effect.
Peer Review Status:Awaiting Review
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-21
Abstract： The cooling storage ring (CSR) external-target experiment (CEE) is a spectrometer used in construction to study the properties of nuclear matter in high-baryon density regions at the Heavy-Ion Research Facility in Lanzhou (HIRFL). This study presents the design, simulation, manufacturing, and testing of a half-size prototype of a multi-wire drift chamber (MWDC) for the CEE. First, the performance of the MWDC connected to home-made electronics was simulated. The results demonstrated that an energy resolution of 18.5% for 5.9-keV X-rays and a position resolution of 194 um for protons can be achieved by the current design. Because the size of the largest MWDC reached 176 × 314 cm, a set of 98 × 98 cm prototypes was built using the new techniques. The positioning accuracy of the anode wires in this prototype exceeded 20 um. After optimization using commercially available electronic devices, the prototype achieved an energy resolution of 19.7% for a 55Fe X-ray source. The CEE-MWDC detector and electronics were simultaneously tested. An energy resolution of 22% was achieved for the 55Fe source; the track residuals were approximately 330 um for the cosmic rays. The results demonstrate that the current design and techniques meet the requirements of the CEE-MWDC array.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-21
Abstract： [Background]: In order to apply in different scenarios of silicon-photomultiplier-coupled scintillator detector, Preamplifiers need to fulfill different requirements. [Purpose]: This study aims to design high-bandwidth, low-noise preamplifiers to cater for different output modes of silicon-photomultiplier-coupled scintillator detector. [Methods]: Based on OPA855 and consideration of bandwidth and noise, a transimpedance amplifier (TIA) and a voltage feedback amplifier (VFB) were designed. The amplifier circuits were simulated and analysed using PSpice for TI software to obtain circuit parameters. Finally, the signal response and noise baseline level were measured, and signals of 241Am source were analysed using a silicon-photomultiplier-coupled Cerium-doped Gadolinium Aluminum Gallium Garnet (GAGG(Ce)) detector. [Results and Conclusions]: These preamplifiers have good gain stability. TIA's bandwidth is 101MHz lower than VFB's 381MHz, but its baseline noise level σnoise≅ 448.32μV is better than the VFB's σnoise≅ 680.96μV . In addition, TIA is suitable for energy measurements and small-area SiPM applications, while VFB is more suitable for time measurements and large-area SiPM arrays.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-18
Abstract： [Background] Due to the independence of traditional neutron and density measurement instruments, in order to improve the safety and efficiency of geological information.[Purpose]Integrate the design of existing neutron and density instruments to merge the neutron density components And analyze in detail the gamma influencing factors in integrated design.[Methods] In order to investigate the influence of the distance between neutron and gamma sources on detector measurements, Monte Carlo simulation was used to analyze detector counts and energy spectra at different distances between neutron and gamma sources, and the results were validated under different rock and density conditions.[Results] Keeping the true instrument source distance, neutron source intensity and other parameters unchanged, the neutron radiation field has no significant impact on the density measurement results when the neutron and gamma sources are 410mm apart, and the absolute error of the inversion density is less than 0.015g/cm3. By changing the neutron source intensity to explore the impact of source intensity on integrated research, and simulating multiple neutron sources with different intensities, it can be found that as the neutron source intensity gradually increases, the optimal distance between the neutron source and gamma source gradually increases and presents a quadratic function relationship.[Conclusions] Based on such findings, the distance between the two sources can be flexibly determined based on the strength of the neutron source, enabling rapid performance evaluation of on-site instrument testing and providing theoretical guidance for integrated design.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-11
Abstract： [Background]:In response to the issue of neutron beam instability or misfire during the operation of the Thorium Molten Salt Reactor with a Particle and Neutron Source (TMSR-PNS), it is necessary to design and develop a neutron beam monitor with high counting rate, low neutron beam perturbation, and high neutron/gamma discrimination capability. [Purpose]: This study aims to investigate the influence of structural parameters of neutron beam monitors on their performance. [Methods]: Firstly, considering that the energy spectrum of TMSR-PNS mainly focuses on the energy range from thermal neutrons to 1 MeV, LiF was chosen as the neutron conversion material. The SRIM program was used to calculate the range of secondary charged particles in the neutron conversion layer and the scintillator, providing a preliminary reference for determining the thickness. Subsequently, a relevant physical model was established using Geant4, irradiating with neutrons and gamma rays of different energies. Finally, the simulation results were used to determine the effects of parameters such as neutron conversion layer thickness, scintillator thickness, metal shell, and the placement angle of the PMT on the detector performance. [Results]: The neutron conversion layer thickness of the scintillator is relatively suitable at about 2 µm for intrinsic detection efficiency. With a scintillator thickness of 2 mm and a discrimination threshold of 0.1 MeV, the detector demonstrates insensitivity to gamma rays. Additionally, by comparing the impact of different shell materials on electron generation by gamma rays, iron, which produces fewer electrons, was selected as the shell material. [Conclusions]: The influence of detector structural parameters on detector performance obtained in this study is of guiding significance, providing theoretical reference for the subsequent preparation of detectors.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-07
Abstract： [Background]: With the deepening of oil and gas exploration, the research on the design and measurement methods of X-ray density logging tools, as a new generation of controllable sources, has attracted widespread attention. [Purpose]: Based on the prototype of ultra-slim gamma logging tool, the gamma source is replaced with an X-ray source. [Methods]: The specific content includes: 1) simulating and matching the energy spectrum of the X-ray source; 2) comprehensively guiding the forward design of the key parameters of the tool through indicators such as detection efficiency, formation sensitivity, and detection depth; 3) conducting X-ray density measurements based on the multivariate forward and inverse modeling method, and comparing them with gamma density logging results. [Results]: The results show that when the short and long-spaced detectors’ source distances of the X-ray tool are set to 110mm and 290mm, it can achieve comparable or even higher detection indicators compared to gamma tool. Compared with gamma logging, X-ray logging has better formation sensitivity, vertical resolution, and formation measurement accuracy. The formation density and Pe are within 0.015g/cm3 and 0.2b/e, respectively. Especially in the barite mudcake scenario, the accuracy of Pe measurement has been improved by 47%. [Conclusions]: These studies provide reference for tool forward design and X-ray density measurement.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-06
Abstract： [Background]: With the deepening of oil and gas exploration, the research on the design and measurement methods of X-ray density logging tools, as a new generation of controllable sources, has attracted widespread attention. [Purpose]: Based on the prototype of ultra-slim gamma logging tool, the gamma source is replaced with an X-ray source. [Methods]: The specific content includes: 1) simulating and matching the energy spectrum of the X-ray source; 2) comprehensively guiding the forward design of the key parameters of the tool through indicators such as detection efficiency, formation sensitivity, and detection depth; 3) conducting X-ray density measurements based on the multivariate forward and inverse modeling method, and comparing them with gamma density logging results. [Results]: The results show that when the short and long-spaced detectors’ source distances of the X-ray tool are set to 110mm and 290mm, it can achieve comparable or even higher detection indicators compared to gamma tool. Compared with gamma logging, X-ray logging has better formation sensitivity, vertical resolution, and formation measurement accuracy. The formation density and Pe are within 0.015g/cm3 and 0.2b/e, respectively. Especially in the barite mudcake scenario, the accuracy of Pe measurement has been improved by 47%. [Conclusions]: These studies provide reference for tool forward design and X-ray density measurement.
Subjects: Physics >> Nuclear Physics Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-04-28
Abstract： A charged particle array, named MATE-PA, which serves as an auxiliary detec#2;tor system to the Multi-purpose Active-target Time projection chamber for nuclear astrophysical and exotic beam Experiments (MATE) has been con#2;structed. The array is composed of twenty single-sided strip-silicon detectors, covering around 10% of the solid angle. It is dedicated for the detection of reaction-induced charged particles which penetrate the MATE active volume. The performance of MATE-PA has been experimentally studied using an alpha source, and a 36-MeV 14N beam injected into the chamber of MATE, filled with a mixture gas of 95% 4He and 5% CO2 under the pressure of 500 mbar, at the Radioactive Ion Beam Line in Lanzhou (RIBLL). The results demonstrate good separation of light charged particles with the forward double-layer silicon detectors of MATE-PA. The energy resolution of the Si detectors was deduced to be about 1% (σ) for an energy loss of about 10 MeV by the α particles. The inclusion of MATE-PA helps improve particle identification, and increases the dynamic range for the kinetic energy of charged particles, in particular that of α particles up to about 15 MeV.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-04-26
Abstract： [Background]: The High Energy Cosmic Radiation Detection Facility (HERD) is a flagship scientific instrument planned to be deployed on the Chinese Space Station, aiming to indirectly detect dark matter, accurately measure cosmic ray compositions, and conduct surveys of high-energy gamma-ray emissions. Among them, the silicon charge detector is one of the key components of HERD, used to measure the charges of cosmic rays ranging from hydrogen to nickel.[Purpose]: To validate and analyze the charge measurement capability of silicon charge detectors, a ground test system was designed for a prototype silicon charge detector beamline.[Methods]: The ground test system utilizes Xilinx's ZYNQ UltraScale+ MPSoC chip as the control chip, achieving functions including LVDS data reception, encoding and decoding, RS-422 control, and gigabit Ethernet data reception and storage. [Results]: The silicon charge detector beamline prototype participated in heavy ion beam experiments at the European Nuclear Research Center, with the ground test system collecting 100G of experimental data during the beamline experiments. [Conclusions]: The Ground Test system demonstrated good stability and reliability during the beam experiment, providing important technical support and data foundation for subsequent experiments of the HERD project's silicon charge detector.
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