Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment最新文献

{"title":"Exploring spatial resolution enhancements on IMAT for steel corrosion studies","authors":"Vicky Ullas Mirashi ,&nbsp;Winfried Kockelmann ,&nbsp;Nikil Kapur ,&nbsp;Anna Fedrigo ,&nbsp;Manuel Morgano ,&nbsp;Thawatchart Chulapakorn ,&nbsp;Adrian Losko ,&nbsp;Alexander Wolfertz ,&nbsp;Anton S. Tremsin ,&nbsp;Adriana Matamoros-Veloza","doi":"10.1016/j.nima.2025.170284","DOIUrl":"10.1016/j.nima.2025.170284","url":null,"abstract":"<div><div>Neutron imaging offers benefits over X-rays for steel corrosion studies including deep penetration and high sensitivity to some light elements such as hydrogen. However, the resolution is frequently at or below the thickness of the corroded layer. This work demonstrates two approaches to enhance the spatial resolution on IMAT at the ISIS neutron source. The first approach shows that a fiber optics taper attached to an optical camera box for white beam imaging can achieve a spatial resolution down to 15 μm. The second approach uses event centroiding with a Timepix3-based detector for diffraction contrast imaging achieving a spatial resolution of 30 μm. These results support advances in corrosion and degradation studies of steel using neutron imaging.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170284"},"PeriodicalIF":1.5,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A model-independent method for mitigation of pileup artefacts in energy-resolved radiation counting","authors":"Vincenzo Monaco,&nbsp;Elisabetta Durisi,&nbsp;Valeria Monti,&nbsp;Lorenzo Visca","doi":"10.1016/j.nima.2025.170276","DOIUrl":"10.1016/j.nima.2025.170276","url":null,"abstract":"<div><div>This article presents a model-independent post-processing method to restore the counting and spectral information of pulse-height analyzers in the presence of pulse pileup at high counting rates. The method is based on the measurement of counts and of the integral durations of the detector signals over different thresholds, and on the comparison of the measurements from two sources with the same energy distribution and different counting rates <span><math><mi>ρ</mi></math></span>. The procedure does not require the modeling of the pulse shape, the knowledge of the dead-time <span><math><mi>τ</mi></math></span> or other parameters. The correction technique was validated with simulations and with spectra of high activity gamma sources collected with a high-purity germanium (HPGe) detector. For a simulated flat energy distribution and a ratio 2 between the two counting rates, the relative mean deviation between the corrected and input spectra is less than 1% and the relative standard deviation below 5% up to a normalized input rate <span><math><mrow><mi>ρ</mi><mi>τ</mi><mo>=</mo><mn>1</mn><mo>.</mo><mn>0</mn></mrow></math></span>. These results improve by increasing the difference between the input rates of the two sources. In the simulation of an X-ray spectrum at a normalized input rate <span><math><mrow><mi>ρ</mi><mi>τ</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>5</mn></mrow></math></span>, the ratio between the number of corrected and generated counts in each energy bin is below a few percent. The experimental validation was performed by acquiring two spectra of <span><math><msup><mrow></mrow><mrow><mn>241</mn></mrow></msup></math></span>Am sources of different activities placed in a fixed position and of a high activity <span><math><msup><mrow></mrow><mrow><mn>137</mn></mrow></msup></math></span>Cs source placed in two different position. In both cases, the correction method provides count rate distributions in close agreement with a reference spectrum from a lower activity source. The mitigation of artefacts in HPGe spectra overcomes the performance of a standard pileup rejection method.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170276"},"PeriodicalIF":1.5,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and implementation of a front-end amplifier with over 100 dB dynamic range and 40 MHz bandwidth","authors":"Lushan Wang ,&nbsp;Qiang Yang ,&nbsp;Qiang Li ,&nbsp;Sixin Wu ,&nbsp;Bo Peng ,&nbsp;Jiaxing Wen ,&nbsp;Yue Yang ,&nbsp;Wenbo Mo ,&nbsp;Yugang Zhou ,&nbsp;Ling Miao ,&nbsp;Jiazhou Li","doi":"10.1016/j.nima.2025.170254","DOIUrl":"10.1016/j.nima.2025.170254","url":null,"abstract":"<div><div>In the high-energy astrophysical research, high-power laser-plasma experiments, and many fields, the detection of particles with wide energy range or radiation fields with wide flux range is required. However, the dynamic range of most radiation detector systems are not exceeding four orders of magnitude due to the limiting dynamic range of readout electronic circuits, which cannot satisfy the requirement. This paper proposes a preamplifier circuit design for radiation detectors with high dynamic range and high bandwidth. The preamplifier is a transimpedance amplifier with two feedback loops, featuring a fast trigger and switch circuit to automatically adjust the amplifier’s gain. Ultimately, the circuit achieved a dynamic range of over five orders of magnitude at a 40 MHz bandwidth, reaching 102.59 dB. Used in a liquid scintillation detector readout system, the preamplifier was tested in an n-<span><math><mi>γ</mi></math></span> discrimination experiment. The experimental results show that, coupling the detector with this circuit achieves a larger dynamic range detection and better n-<span><math><mi>γ</mi></math></span> discrimination capability.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170254"},"PeriodicalIF":1.5,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143128791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of oxygen-rich targets for elastic backscattering applications using the high-energy vibrational powder plating method","authors":"Stefan Gmuca,&nbsp;Ján Kliman","doi":"10.1016/j.nima.2025.170278","DOIUrl":"10.1016/j.nima.2025.170278","url":null,"abstract":"<div><div>Thin and thick oxygen-rich targets of metal-oxide WO<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> powder were prepared using an in-air version of the high-energy vibrational powder plating method. The targets are intended to be used for elastic backscattering applications of ¹⁶O(<span><math><mi>α</mi></math></span>, <span><math><mi>α</mi></math></span>) and ¹⁶O(p,p) resonances at 3038 keV and 3473 keV, respectively, in the beam energy calibration of small accelerators. The high resolution optical microscopy method and X-ray fluorescence technique were used to characterize the targets deposited on various backing substrates. It was shown that the distribution of tungsten in the deposited layers is homogeneous and uniform. From the stoichiometric preservation of the method, the homogeneity and uniformity of the O distribution are deduced. The results indicate that the method used is a viable and effective technique for preparing high-quality nuclear targets, with significant implications for elastic backscattering experiments and other applications in nuclear physics.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170278"},"PeriodicalIF":1.5,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of correlations between spectral phase fluctuations of the laser pulse and the performance of an LPA","authors":"Finn Kohrell ,&nbsp;Sam Barber ,&nbsp;Kyle Jensen ,&nbsp;Christopher Doss ,&nbsp;Curtis Berger ,&nbsp;Carl Schroeder ,&nbsp;Eric Esarey ,&nbsp;Florian Grüner ,&nbsp;Jeroen van Tilborg","doi":"10.1016/j.nima.2025.170267","DOIUrl":"10.1016/j.nima.2025.170267","url":null,"abstract":"<div><div>Successfully using electron bunches generated from Laser-Plasma Accelerators (LPAs) to drive reliable Free-Electron Lasers (FELs) requires exceptional stability of the parameters involved in the LPA interaction. On the BELLA Center’s Hundred Terawatt Undulator (HTU) System at Lawrence Berkeley National Laboratory (LBNL) we use a 100 Terawatt Ti:Sapph laser, capable of supplying 2.5 Joule, sub 40 fs pulses at 1 Hz on target, to produce 100 MeV, quasi-monoenergetic electron beams. As part of the effort to characterize and stabilize the laser pulses, a non-invasive on-shot spectral phase diagnostic was designed and commissioned on the HTU beamline. The results allow studying the direct correlations of spectral phase fluctuations to LPA and FEL parameters and chart a path towards further stabilization of the LPA process.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170267"},"PeriodicalIF":1.5,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a linac-based LEPD experimental station for surface structure analysis and coordination with synchrotron radiation ARPES","authors":"Rezwan Ahmed ,&nbsp;Izumi Mochizuki ,&nbsp;Toshio Hyodo ,&nbsp;Tetsuroh Shirasawa ,&nbsp;Seigi Mizuno ,&nbsp;Yoshinari Kondo ,&nbsp;Kenichi Ozawa ,&nbsp;Miho Kitamura ,&nbsp;Kenta Amemiya ,&nbsp;Bartlomiej Checinski ,&nbsp;Jozef Ociepa ,&nbsp;Achim Czasch ,&nbsp;Ottmar Jagutzki ,&nbsp;Ken Wada","doi":"10.1016/j.nima.2025.170270","DOIUrl":"10.1016/j.nima.2025.170270","url":null,"abstract":"<div><div>We report on the development of a low-energy positron diffraction (LEPD) experimental station for surface structure analysis using a linear electron accelerator (linac)-based slow-positron beam. LEPD is the positron counterpart of low-energy electron diffraction (LEED) and is expected to offer higher accuracy in surface structure determination compared to LEED. The station enables acquisition of LEPD <span><math><mi>I</mi></math></span>–<span><math><mi>V</mi></math></span> curves within a few hours. It consists of two ultra-high vacuum (UHV) chambers for LEPD measurements and sample preparation, equipped with essential tools for surface preparation and evaluation. A newly designed sample holder has been developed to be compatible with this LEPD station at SPF-A4 of the Slow Positron Facility (SPF) and the angle-resolved photoemission spectroscopy (ARPES) station at BL-13B of the Photon Factory (PF), both located at the Tsukuba campus of the Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK). This system facilitates LEPD and ARPES measurements on the same sample under consistent surface conditions, achieved through identical preparation environments and procedures.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170270"},"PeriodicalIF":1.5,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polarization radiation from a fractal cluster","authors":"Pavel G. Shapovalov,&nbsp;Alexey A. Tishchenko","doi":"10.1016/j.nima.2025.170266","DOIUrl":"10.1016/j.nima.2025.170266","url":null,"abstract":"<div><div>The paper considers the polarization radiation that occurs when an ultrarelativistic electron passes through a fractal cluster. The characteristics of radiation from clusters of different sizes constructed using the diffusion limited aggregation algorithm are numerically calculated. The transformation of the polarization radiation pattern is traced depending on the number of particles in the cluster. The evolution of the asymmetry formation “forward–backward” is clearly observed with an increase in the number of particles making up the fractal cluster.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170266"},"PeriodicalIF":1.5,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"HIBISCUS: A new ion beam radio-frequency quadrupole cooler-buncher for high-precision experiments with exotic radioactive ions","authors":"A. Jaries ,&nbsp;J. Ruotsalainen ,&nbsp;R. Kronholm ,&nbsp;T. Eronen ,&nbsp;A. Kankainen","doi":"10.1016/j.nima.2025.170273","DOIUrl":"10.1016/j.nima.2025.170273","url":null,"abstract":"<div><div>HIBISCUS (Helium-Inflated Beam Improvement Setup that Cools and Undermines Spreads), a new radiofrequency quadrupole cooler-buncher device has been developed and commissioned offline at the Ion Guide Isotope Separator On-Line (IGISOL) facility in Jyväskylä in Finland, as an in-kind contribution for the Facility for Antiproton and Ion Research facility. HIBISCUS improves the ion optical properties of incident low-energy 6 keV beams with the option to have it ultimately extracted in temporally short bunches (<span><math><mrow><mo>&lt;</mo><mn>1</mn></mrow></math></span> <span><math><mrow><mi>μ</mi><mi>s</mi></mrow></math></span>). This paper provides technical descriptions of its main characteristics, along with a set of optimum working parameters and performance in terms of transmission efficiency, longitudinal energy spread of the cooled ions and temporal width of the extracted bunches.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170273"},"PeriodicalIF":1.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamic parameters of the electron gas in CdSe nanoplatelets","authors":"L.A. Tadevosyan ,&nbsp;H.Ts. Ghaltaghchyan ,&nbsp;V.A. Harutyunyan ,&nbsp;Y.Sh. Mamasakhlisov ,&nbsp;H.A. Sarkisyan","doi":"10.1016/j.nima.2025.170274","DOIUrl":"10.1016/j.nima.2025.170274","url":null,"abstract":"<div><div>The thermodynamic characteristics of weakly interacting electron gas in CdSe nanoplatelet are theoretically studied. In the Boltzmann approximation, the partition function of the system is precisely calculated, and it is shown that it is expressed through the Ramanujan theta function. The dependences of the entropy and heat capacity on the size of the nanoplatelet are determined. The temperature behavior of the heat capacity of the gas of electrons in low- and high-temperature regions is analyzed.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170274"},"PeriodicalIF":1.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of β-particles to determine cross sections relevant to the weak r-process","authors":"Sándor R. Kovács ,&nbsp;Tibor Norbert Szegedi ,&nbsp;Ákos Tóth ,&nbsp;Attila Németh ,&nbsp;Manoj Kumar Pal ,&nbsp;Edit Szilágyi ,&nbsp;Mihály Braun ,&nbsp;György Gyürky ,&nbsp;Zoltán Elekes ,&nbsp;Zoltán Halász ,&nbsp;Tamás Szücs ,&nbsp;Gábor Gyula Kiss","doi":"10.1016/j.nima.2025.170272","DOIUrl":"10.1016/j.nima.2025.170272","url":null,"abstract":"<div><div>The neutron-rich isotopes with 30 <span><math><mo>≤</mo></math></span> Z <span><math><mo>≤</mo></math></span> 45 are thought to be synthesized in neutrino-driven winds after the collapse of a massive star. This nucleosynthesis scenario, called the weak r-process, is studied using nuclear reaction network calculations. The accuracy of the nucleosynthesis simulations is strongly influenced by the reliability of the nuclear physics input parameters used. Recently, it has been demonstrated that (<span><math><mi>α</mi></math></span>,n) reactions play a particularly important role in the weak r-process, but their rates – computed from the cross sections – are only known with large uncertainties in the astrophysically relevant temperature range. The half-lives of the products of some key reactions are such that, in principle, the cross sections can be studied using the activation technique. In many cases, however, the <span><math><mi>β</mi></math></span>-decay of the reaction products leads to the ground state of the daughter nucleus, hence no gamma emission occurs. The purpose of this manuscript is to present our setup with which we determine the cross sections by measuring the yield of <span><math><mi>β</mi></math></span>-particles emitted during radioactive decay. The ⁸⁶Kr(<span><math><mi>α</mi></math></span>,n)⁸⁹Sr reaction cross-section measurement is used, as a case study.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170272"},"PeriodicalIF":1.5,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}