Subjects: Physics >> Nuclear Physics Subjects: Physics >> Interdisciplinary Physics and Related Areas of Science and Technology submitted time 2024-08-09
Abstract： Scanning magnets are devices responsible for deflecting particles to specific locations in particle therapy utilizing spot scanning techniques. To ensure the distortion of the scanned beams’ shapes remains within an acceptable level, it is necessary to guarantee that the homogeneity of the field integrals is sufficiently high in the two transversal directions within the good field region. Typically, this is accomplished by adding shims on both sides of magnet poles. In this study, we innovatively proposed a method to perform multi-objective optimization of shim parameters and excitation currents by the state-of-the-art evolutionary algorithm Non- dominated Sorting Genetic Algorithm-III (NSGA-III). Furthermore computer vision (CV) was implemented to automatically evaluate both the beam shape distortions and the centroids of the scanned beam spots at the target plane to assist efficient optimization process. With this method, optimal parameters of scanning magnets which have capability of scanning a carbon beam of 400 MeV/u beam energy across a 20 cm × 20 cm field size with a source-to-axis distance of 255 cm were obtained successfully. Meanwhile, we also conducted eddy current and temperature rise analysis, laminated steel plates with 19 slits cut near the pole gaps were used to reduce eddy
currents due to rapid variation of magnetic fields during the scanning process. Based on the optimized magnets
parameters, eddy current and temperature analyses were performed and the temperature rises were found to be near 40°C and 54°C for the Y and X magnets respectively at the designed scanning speeds, which meets the requirements for normal operation. This proposed procedure of optimization is expected to facilitate efficient and sophisticated design of various magnets applied to charged particle accelerators.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2024-08-06
Abstract： We investigated the properties of the phase diagram of high-order susceptibilities, speed of sound, and poly- tropic index based on an extended Nambu-Jona-Lasinio model with an eight-quark scalar-vector interaction. Non-monotonic behavior was observed in all these quantities around the phase transition boundary, which also revealed the properties of the critical point. Further, this study indicated that the chiral phase transition bound- ary and critical point could vary depending on the scalar-vector coupling constant GSV . At finite densities and temperatures, the negative GSV term exhibited attractive interactions, which enhanced the critical point temperature and reduced the chemical potential. The GSV term also affected the properties of the high-order susceptibilities, speed of sound, and polytropic index near the critical point. The nonmonotonic (peak or dip) structures of these quantities shifted to a low baryon chemical potential (and high temperature) with a negative GSV. GSV also changed the amplitude and range of the nonmonotonic regions. Therefore, the scalar-vector interaction was useful for locating the phase boundary and critical point in QCD phase diagram by comparing the experimental data. The study of the non-monotonic behavior of high-order susceptibilities, speed of sound, and polytropic index is of great interest, and further observations related to high-order susceptibilities, speed of sound, and polytropic index being found and applied to the search for critical points in heavy-ion collisions and the study of compact stars are eagerly awaited.
Subjects: Nuclear Science and Technology >> Radiation Physics and Technology Subjects: Physics >> Nuclear Physics submitted time 2024-08-06
Abstract： The back-streaming white-neutron beam line (Back-n) of the China Spallation Neutron Source is an essential neutron-research platform built for the study of nuclear data, neutron physics, and neutron applications. Many types of cross-sectional neutron-reaction measurements have been performed at Back-n since early 2018. These measurements have shown that a significant number of gamma rays can be transmitted to the experimental stations of Back-n along with the neutron beam. These gamma rays, commonly referred to as in-beam gamma rays, can induce a non-negligible experimental background in neutron-reaction measurements. Studying the characteristics of in-beam gamma rays is important for understanding the experimental background. However, measuring in-beam gamma rays is challenging because most gamma-ray detectors are sensitive to neutrons; thus, discriminating between neutron-induced signals and those from in-beam gamma rays is difficult. In this study, we propose the use of the black resonance filter method and a CeBr3 scintillation detector to measure the characteristics of the in-beam gamma rays of Back-n. Four types of black resonance filters, 181Ta, 59Co, natAg, and natCd, were used in this measurement. The time-of-flight (TOF) technique was used to select the detector signals remaining in the absorption region of the TOF spectra, which were mainly induced by in-beam gamma rays. The energy distribution and flux of the in-beam gamma rays of Back-n were determined by analyzing the deposited energy spectra of the CeBr3 scintillation detector and using Monte Carlo simulations. Based on the results of this study, the background contributions from in-beam gamma rays in neutron-reaction measurements at Back-n can be reasonably evaluated, which is beneficial for enhancing both the experimental methodology and data analysis.
Subjects: Physics >> Nuclear Physics submitted time 2024-08-05
Abstract： We modified Zr/Ce-UiO-66-NH2 using dual bimetallization and amination strategies to efficiently extract uranium from water resources. XRD, FTIR, and XPS indicated the successful alteration of material amination. Moreover, the metal Zr was partially replaced by Ce in Zr-oxygen atom clusters in Zr/Ce-UiO-66-NH2. It possessed commendable structural stability in acidic and alkaline solutions. Irrespective of whether it was submerged in a 6 M strong acid or in a 0.5M strong base solution, the structural integrity of Zr/Ce-UiO-66 NH2 remained unaffected. Batch experiments at pH = 6.0 revealed that uranium adsorption by Zr/Ce-UiO-66 NH2 reached 376.8mg · g−1 and 611.33mg · g−1 at 298K and 328K, respectively. These values are much better than those obtained using bimetallic-modified Zr/Ce-UiO-66 or amine-functionalized UiO-66-NH2. After f ive consecutive sorption and desorption cycles, the material retained a uranium removal rate of more than 80%, proving its excellent regenerative properties. Kinetic modeling of U(VI) adsorption on Zr/Ce-UiO-66 NH2 implied that chemisorption dominated the rapid uranium sorption rate. We propose potential adsorption mechanisms involving three interactions: inner-sphere surface complexation, chemisorption, and electrostatic interactions. This study shows that the dual strategies of bimetallization and amination can effectively enhance U(VI) extraction from water. This approach has potential applications for the structural design of uranium adsorbents.
Subjects: Physics >> Nuclear Physics submitted time 2024-07-30
Abstract： In current neural network algorithms for nuclide identification in high-background, poor-resolution detectors,traditional network paradigms including back-propagation networks, convolutional neural networks, recurrent
neural networks, etc. have been limited in research on γ spectrum analysis because of their inherent mathemat#2;
ical mechanisms. It is difficult to make progress in terms of training data requirements and prediction accuracy.
In contrast to traditional network paradigms, network models based on the transformer structure have the charac#2;
teristics of parallel computing, position encoding, and deep stacking, which have enabled good performance in
natural language processing tasks in recent years. Therefore, in this paper, a transformer-based neural network
(TBNN) model is proposed to achieve nuclide identification for the first time. First, the Geant4 program was
used to generate the basic single-nuclide energy spectrum through Monte Carlo simulations. A multi-nuclide
energy spectrum database was established for neural network training using random matrices of γ-ray energy,
activity, and noise. Based on the encoder-decoder structure, a network topology based on the transformer was
built, transforming the 1024-channel energy spectrum data into a 32 × 32 energy spectrum sequence as the
model input. Through experiments and adjustments of model parameters, including the learning rate of the
TBNN model, number of attention heads, and number of network stacking layers, the overall recognition rate
reached 98.7%. Additionally, this database was used for training AI models such as back-propagation networks,
convolutional neural networks, residual networks, and long short-term memory neural networks, with overall
recognition rates of 92.8%, 95.3%, 96.3%, and 96.6%, respectively. This indicates that the TBNN model exhib#2;
ited better nuclide identification among these AI models, providing an important reference and theoretical basis
for the practical application of transformers in the qualitative and quantitative analysis of the γ spectrum.
Subjects: Physics >> Nuclear Physics submitted time 2024-07-30
Abstract： Track reconstruction algorithms are critical for polarization measurements. Convolutional neural networks (CNNs) are a promising alternative to traditional moment-based track reconstruction approaches. However, the hexagonal grid track images obtained using gas pixel detectors (GPDs) for better anisotropy do not match the classical rectangle-based CNN, and converting the track images from hexagonal to square results in a loss of information.
We developed a new hexagonal CNN algorithm for track reconstruction and polarization estimation in X-ray polarimeters, which was used to extract the emission angles and absorption points from photoelectron track images and predict the uncertainty of the predicted emission angles. The simulated data from the PolarLight test were used to train and test the hexagonal CNN models. For individual energies, the hexagonal CNN algorithm produced 15%–30% improvements in the modulation factor compared to the moment analysis method for 100% polarized data, and its performance was comparable to that of the rectangle-based CNN algorithm that was recently developed by the Imaging X-ray Polarimetry Explorer team, but at a lower computational and storage cost for preprocessing.
Subjects: Physics >> Nuclear Physics submitted time 2024-07-29
Abstract： Pyrochlores are potential immobilization matrices of high-level radioactive waste, and it is important to study the irradiation effect of pyrochlore immobilization matrices. Y2-xCexTi2O7+y (x = 0, 0.2, 0.4, 0.6) pyrochlores were irradiated by 400 keV Ne2+ and 6.5 MeV Xe26+ at room temperature at an average dose of about 0.16 dpa. Under 400 keV Ne2+ irradiation, the samples undergo lattice disorder, phase separation and partial amorphization in sequence with increasing Ce content. Under 6.5 MeV Xe26+ irradiation, the damage in samples is more significant than that of the samples irradiated by Ne2+, but no phase separation is observed in any of this group. This difference in the damage process may be related to the rate of defect accumulation. The proportion of nuclear energy loss of 6.5 MeV Xe ions in Y2-xCexTi2O7+y is 29.88%, which is larger than that of 400 keV Ne ions (17.15%), leading to a faster defect accumulation and more stable defect clusters in the samples irradiated by Xe ions, and therefore amorphization occurs directly from disordered pyrochlores. This result may contribute to the selection of ion beam species and energies with specific irradiation modification objectives.
Subjects: Physics >> Nuclear Physics submitted time 2024-07-28
Abstract： In the scenario of a steam generator tube rupture (SGTR) accident in a lead-cooled fast reactor (LFR), secondary
circuit subcooled water under high pressure is injected into an ordinary-pressure primary vessel, where
a molten lead-based alloy (typically pure lead or lead bismuth eutectic (LBE)) is used as the coolant. To clarify
the pressure build-up characteristics under water jet injection, this study conducted several experiments by injecting
pressurized water into a molten LBE pool at Sun Yat-sen University. To obtain a further understanding,
several new experimental parameters were adopted, including the melt temperature, water subcooling, injection
pressure, injection duration, and nozzle diameter. Through detailed analyses, it was found that the pressure
and temperature during the water-melt interaction exhibited a consistent variation trend with our previous water
droplet injection mode LBE experiment. Similarly, the existence of a steam explosion was confirmed, which
typically results in a much stronger pressure buildup. For the non-explosion cases, increasing the injection
pressure, melt-pool temperature, nozzle diameter, and water subcooling promoted pressure build-up in the melt
pool. However, a limited enhancement effect was observed when increasing the injection duration, which may
be owing to the continually rising pressure in the interaction vessel or the isolation effect of the generated steam
cavity. Regardless of whether a steam explosion occurred, the calculated mechanical and kinetic energy conversion
efficiencies of the melt were relatively small (not exceeding 4.1% and 0.7%, respectively). Moreover, the
range of the conversion efficiency was similar to that of previous water droplet experiments, although the upper
limit of the jet mode was slightly lower.
Subjects: Physics >> Nuclear Physics submitted time 2024-07-17
Abstract： We present a theoretical study of the medium modifications of the $p_T$ balance ($x_J$) of dijets in Xe+Xe collisions at $sqrt{s_{NN}}$ = 5.44 TeV. The initial production of dijets was carried out using the POWHEG+PYTHIA8 prescription, which matches the next-to-leading order (NLO) QCD matrix elements with the parton shower (PS) effect. The SHELL model described the in-medium evolution of nucleus-nucleus collisions using a transport approach. The theoretical results of the dijet $x_J$ in the Xe+Xe collisions exhibit more imbalanced distributions than that in the p+p collisions, consistent with the recently reported ATLAS data. By utilizing the Interleaved Flavor Neutralisation, an infrared-and-collinear-safe jet flavor algorithm, to identify the flavor of the reconstructed jets, we classify dijets processes into three categories: gluon-gluon ($gg$), quark-gluon ($qg$) and quark-quark ($qq$), and investigated the respective medium modification patterns and fraction changes of the $gg$, $qg$, and $qq$ components of the dijet sample in Xe+Xe collisions. It is shown that the increased fraction of $qg$ component at a small $x_J$ contributes to the imbalance of the dijet; in particular, the $q_1g_2$ (quark-jet-leading) dijets experience more significant asymmetric energy loss than the $g_1q_2$ (gluon-jet-leading) dijets traversing the QGP. By comparing the $∆⟨x_J⟩$ of inclusive, ccbar and bbbar dijets in Xe+Xe collisions, we observe $∆⟨x_J⟩_{incl.} > ∆⟨x_J⟩_{ccbar} > ∆⟨x_J⟩_{bbbar}$. Moreover, $ρ_{Xe,Pb}$, the ratios of the nuclear modification factors of dijets in Xe+Xe to that in Pb+Pb, were calcualted, which indicates that the yield suppression of dijets in Pb+Pb is more pronounced than that in Xe+Xe owing to the larger radius of the lead nucleus.
Subjects: Physics >> Nuclear Physics submitted time 2024-07-13
Abstract： Abstract [Background]: The indirect non-destructive measurement of accelerator electron beam parameters has been a challenge, and the traditional methods using X-ray pinhole imaging on a storing ring or slit diffraction on a linear accelerator have their own shortcomings. Laser Compton Scattering (LCS) device is a new type of a light source producing a high-energy γ beam by the interaction of relativistic electrons and low-energy photons. [Purpose]: To extract the SSRF electron beam parameters based on the LCS techniques. [Method]: This study aims to search for the simulated spectrum, reconstructed by the Monte Carlo simulation program based on Geant4, that best matches the experimental energy spectrum. Then the corresponding parameters are extracted, which include the horizontal beam size, energy, and emittance. The consistency of the gamma energy spectrum at different colliding angles measured on the Shanghai Laser Electron Gamma Source (SLEGS) beamline station of Shanghai Synchrotron Radiation Facility (SSRF) is verified. [Results]: The extracted electron beam parameters of the Shanghai Light Source storing ring are in good agreement with the theoretical values. [Conclusion]: It proves that Laser Compton scattering to be an effective and non-destructive way to determine the electron beam parameters indirectly and lays a stable foundation for the extraction of other parameters of the electron beam.
Subjects: Physics >> Nuclear Physics submitted time 2024-07-09
Abstract： The validity of the isobaric multiplet mass equation (IMME) is of fundamental importance due to the basic
concept of isospin. Recently, a serious breakdown was found in the 𝐴 = 54 𝑇 = 3 isospin septet, the largest isospin
system where the validity of IMME have been tested up to now. Motivated by this previous study, the masses of specific
isobaric analogue states have been revisited using recent results from advanced mass measurement experiments. It is
found that the IMME holds well in 𝐴 = 50 and 46 isospin septets and the coefficients of IMME also follow the systematic
trends. Mass excess values for 50Ni and 46Fe, are predicted to be -3932(20) keV and 898(67) keV, respectively.
Subjects: Physics >> Nuclear Physics submitted time 2024-06-28
Yong Sun
Qi-Biao Wang
Peng-Cheng Li
Ming Xia
Bin Liu
He-Yong Huo
Wei Yin
Yang Wu
Sheng Wang
Chao Cao
Xin Yang
Run-Dong Li
Hang Li
Bin Tang
Abstract： Nuclear energy is a vital source of clean energy that will continue to play an essential role in global energy production for future generations. Nuclear fuel rods are core components of nuclear power plants, and their safe utilization is paramount. Due to its inherent high radioactivity, indirect neutron radiography (INR) is currently the only viable technology for irradiated nuclear fuel rods in the field of energy production. This study explores the experimental technique of indirect neutron computed tomography (INCT) for radioactive samples. This project includes the development of indium and dysprosium conversion screens of different thicknesses and conducts resolution tests to assess their performance. Moreover, a pressurized water reactor (PWR) dummy nuclear fuel rods have been fabricated by self-developing substitute materials for cores and outsourcing of mechanical processing. Experimental research on the INR is performed using the developed dummy nuclear fuel rods. The sparse reconstruction technique is used to reconstruct the INR results of 120 pairs of dummy nuclear fuel rods at different angles, achieving a resolution of 0.8 mm for defect detection using INCT.
Subjects: Physics >> Nuclear Physics submitted time 2024-06-25
Abstract： [Background]: Neutron capture reaction cross sections are of significant importance in various fields, including fundamental physics, nuclear astrophysics, nuclear engineering, and materials science. Traditionally, the measurement of neutron capture reaction cross sections involves detecting all gamma rays produced from the target nucleus after reacting with neutrons. Theoretical methods are then used to calculate the proportion of the neutron capture reaction, thus obtaining the cross section. This method relies heavily on theoretical predictions and the combined effects of multiple reaction channels, which can obscure the structural features of the target reaction, resulting in smoothed cross section data in the resonance regions predicted by theory. [Purpose]: To overcome the limitations of the traditional method and reduce dependency on theoretical predictions, a more precise method utilizing high-energy resolution gamma detectors is needed to accurately measure the neutron capture reaction cross sections by identifying the yields of individual reaction channels. [Methods]: By analyzing the decay scheme of reaction products, high-energy resolution gamma detectors were employed to measure one or more characteristic gamma lines that can represent the reaction effects. This approach excludes interference from other reaction channels, thereby providing accurate neutron capture reaction cross sections. The 91Zr(n,γ)92Zr reaction was used to compare the advantages and disadvantages of this method with the traditional method. The experiment was conducted at the China Spallation Neutron Source. [Results]: In this work, clear resonance phenomena was observed in the theoretically predicted resonance regions. The results in non-resonance regions were consistent with previous data within error margins. This demonstrates that the new method provides accurate and reliable data for neutron capture reaction cross sections. [Conclusions]: The proposed method has significant advantages over traditional methods, offering a new approach for measuring neutron capture reaction cross sections. It reduces reliance on theoretical predictions and provides more detailed and accurate cross section data, especially in the resonance regions. This new method offers a promising direction for future research in neutron capture reactions.
Subjects: Physics >> Nuclear Physics submitted time 2024-06-25
Abstract： In conventional isochronous mass spectrometry (IMS) performed at a storage ring, the precision of mass measurement for short-lived nuclei depends on the precise determination of the revolution times (Ts) of stored ions. However, the resolution of T inevitably deteriorates due to the magnetic rigidity spread of the ions, resulting in limited mass resolving power. In this work, we measure the betatron tune Q (the number of betatron oscillations within a single revolution) of the ions, and construct a correlation between T and Q. From this correlation, the T are transformed corresponding to a fixed Q with higher resolution. Using the transformed Ts, we re-determine the masses of 63Ge, 65As, 67Se, and 71Kr, which agree well with the mass values measured by the newly developed IMS (Bρ-IMS). We also study the systematics of Coulomb displacement energies (CDEs) and find that the anomalous staggering in CDEs is removed using the new mass values. This method of T transformation is very useful for the conventional IMS equipped with a single time-of-flight detector.
Peer Review Status:Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2024-06-24
Zhi-Jun Chi
Hong-Ze Zhang
Jin Lin
Xuan-Qi Zhang
Hao Ding
Qi-Li Tian
Zhi Zhang
Ying-Chao Du
Wen-Hui Huang
Chuan-Xiang Tang
Abstract： Owing to the Thomson scattering between relativistic electrons and a laser, continuously polarization-tunable X-rays can be easily generated, providing an excellent probe for advanced X-ray imaging. In this paper, a method for simultaneous fluorescence and Compton scattering computed tomography is proposed using linearly polarized X-rays. The proposed method feasibility was verified using Monte Carlo simulations. In the simulations, the phantom is a polytetrafluoroethylene (Teflon) cylinder inside which are cylindrical columns containing aluminum, water, and gold (Au)-loaded water solutions with Au concentrations ranging between 0.5--4.0 wt%, and a parallel hole collimator imaging geometry was adopted. By adjusting the incident X-ray polarization direction, both the X-ray fluorescence computed tomography (XFCT) and Compton scattering computed tomography (CSCT) images of the phantom were accurately reconstructed using a maximum-likelihood expectation maximization algorithm. A similar attenuation contrast problem for the different cylindrical columns in the phantom can be resolved in the XFCT and CSCT images. The interplay between XFCT and CSCT was analyzed and the contrast-to-noise ratio (CNR) of the reconstruction was improved by correcting for the mutual influence between the two imaging modalities. Compared with K-edge subtraction imaging, XFCT exhibits a CNR advantage for the phantom.
Subjects: Nuclear Science and Technology >> Radiation Protection Technology Subjects: Physics >> Nuclear Physics submitted time 2024-06-23
Abstract： The impact of the radiation dose produced by 222Rn/220Rn and its progeny on human health has garnered
increasing interest in the nuclear research field. The establishment of robust, regulatory, and competent 220Rn
chambers is crucial for accurately measuring radioactivity levels. However, studying the uniformity of the 220Rn
progeny through experimental methods is challenging, because measuring the concentration of 220Rn and its
progeny in multiple spatial locations simultaneously and in real time using experimental methods is difficult.
Therefore, achieving precise control of the concentration of 220Rn and its progeny as well as the reliable sampling
of the progeny pose significant challenges. To solve this problem, this study uses computational fluid dynamics
to obtain the flow-field data of the 220Rn chamber under different wind speeds and progeny-replenishment rates.
Qualitative analysis of the concentration distribution of the progeny and quantitative analysis of the progeny
concentration and uniformity of the progeny concentration are conducted. The research findings indicated
that the progeny-concentration level is primarily influenced by wind speed and the progeny-complement rate.
Wind speed also plays a crucial role in determining progeny-concentration uniformity, whereas the progeny-
complement rate has minimal impact on uniformity. To ensure the accuracy of 220Rn progeny-concentration
sampling, we propose a methodology for selecting an appropriate sampling area based on varying progeny
concentrations. This study holds immense importance for enhancing the regulation and measurement standards
of 220Rn and its progeny.
Subjects: Physics >> Nuclear Physics Subjects: Engineering and technical science >> Engineering General Technology submitted time 2024-06-21
Abstract： For tracking and tagging the cosmic-ray muon (CR-muon), the Taishan Antineutrino Observatory (TAO) experiment is equipped with a top veto tracker (TVT) system composed of 160 modules, each consisting of plastic scintillator (PS) strip as target material, embedded wavelength shifting fiber (WLS-fiber) as photon collection and transmission medium, and silicon photomultipliers (SiPMs) at both ends as read-out. This article introduces the unique design of the module and reports the excellent performance of all modules, providing guidance and important reference for the process design of scintillation detectors with WLS-fibers. In general, when the CR-muon hits the center of plastic scintillator and without optical grease, the most probable value of the signal amplitude at one end of the PS strip is greater than 40.8 p.e. and 51.5 p.e. for all the 2 m-length modules and 1.5 m-length modules respectively. The CR-muon tagging efficiency of PS module is measured to be more than 99.3%, which meets the requirement of TAO.
Peer Review Status:Awaiting Review
Subjects: Physics >> The Physics of Elementary Particles and Fields Subjects: Physics >> Nuclear Physics submitted time 2024-06-20
Xiaozhou Yu
Xiyang Wang
Weihu Ma
Shihong Fu
Pengfei Sun
Jinxing Song
Wanbin He
Yang Shen
Long Ma
Jinhui Chen
Huan Zhong Huang
Siguang Wang
Jing Zhou
Xiaomei Li
Abstract： The sPHENIX experiment is a new generation of large acceptance detector at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory with scientific goals focusing on probing the strongly interacting Quark-Gluon Plasma (QGP) with hard probes of jets, open heavy flavor particles and $ Upsilon$ production. The EMCal detector, covering the pseudo-rapidity region of $ eta leq 1.1$, is an essential subsystem of sPHENIX. In this paper, we focus on the production and test for the EMCal blocks covering a pseudo-rapidity of $ eta in 0.8 , 1.1 $. These, in conjunction with central pseudo-rapidity EMCal blocks, significantly enhance the sPHENIX physics capability of jet and $ Upsilon$ particle measurements. In this paper, detector module production and testing of the sPHENIX W-powder/Scintillating Fiber (W/ScFi) Electromagnetic Calorimeter Blocks are presented. Selection of the tungsten powder, mold fabrication, QA procedures and cosmic ray test results are discussed.
Subjects: Physics >> Nuclear Physics submitted time 2024-06-20
Abstract：
Synchrotron microscopic data commonly suffer from poor image quality with degraded resolution incurred by instrumentation defects or experimental conditions. Image restoration methods are often applied to recover the reduced resolution, providing improved image details that can greatly facilitate scientific discovery. Among these methods, deconvolution techniques are straightforward, yet either require known prior information or struggle to tackle large experimental data. Deep learning (DL)-based super-resolution (SR) methods handle large data well, however data scarcity and model generalizability are problematic. In addition, current image restoration methods are mostly offline and inefficient for many beamlines where high data volumes and data complexity issues are encountered. To overcome these limitations, an online image-restoration pipeline that adaptably selects suitable algorithms and models from a method repertoire is promising. In this study, using both deconvolution and pretrained DL-based SR models, we show that different restoration efficacies can be achieved on different types of synchrotron experimental data. We describe the necessity, feasibility, and significance of constructing such an image-restoration pipeline for future synchrotron experiments.
Subjects: Physics >> Nuclear Physics submitted time 2024-06-15
Abstract： Since the ion cyclotron resonance isotope separation (ICR-IS) method was proposed last century, it has received much attention of researchers in the world. Based on the published resuts on the ICR-IS in the past few decades, a review is presented in this paper including the fundamental theorey of ICR-IS, basic structure of device, major criteria for obtaining significant isotope separation effects, and the recent progress in the theoretical and experimental research fields for obtaining different isotopes using the ICR-IS approach. And finally, the key scientific issues in future research for promoting industrial applications of the ICR-IS method are discussed briefly.
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