Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment最新文献_第9页

Studies of simultaneous operation both round beam and flat beam in a diffraction-limited storage ring

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-11 DOI: 10.1016/j.nima.2025.170280

Chongchong Du , Jiuqing Wang , Sheng Wang , Daheng Ji , Saike Tian , Xiaoyu Li

{"title":"Studies of simultaneous operation both round beam and flat beam in a diffraction-limited storage ring","authors":"Chongchong Du , Jiuqing Wang , Sheng Wang , Daheng Ji , Saike Tian , Xiaoyu Li","doi":"10.1016/j.nima.2025.170280","DOIUrl":"10.1016/j.nima.2025.170280","url":null,"abstract":"<div><div>The diffraction-limited storage rings (DLSRs) can provide an electron beam emittance below 100 <span><math><mrow><mtext>pm</mtext><mo>⋅</mo><mtext>rad</mtext></mrow></math></span>, approaching the hard X-rays diffraction limit with better transverse coherence and higher brightness compared to the current light sources, to the synchrotron light users. A round beam with equal horizontal and vertical emittances can effectively mitigate intra-beam scattering effects and increase the Touschek lifetime, however a horizontally elongated flat beam is preferable for some beamline applications with brighter photon beam. Depending on the specific requirement on the experiment, some users prefer high brightness with flat beam while others prefer high horizontal coherence with round beam. To address the limitation of being able to provide only one type of operation mode as either round beam or flat beam, this paper proposes two approaches for the simultaneous operation of both modes with several bunches in flat beam and the other in round beam, namely the flat beam generation in round-beam mode and the round beam generation in flat-beam mode. As an example to demonstrate its feasibility, the lattice design, dynamic aperture, and numerical simulations of these two approaches on the latest lattice of the High Energy Photon Source (HEPS) storage ring, are presented.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170280"},"PeriodicalIF":1.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428120","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}

引用次数: 0

Preliminary experiment study of hardware time stamp method based on event timing system

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-11 DOI: 10.1016/j.nima.2025.170301

Gong Ruizhe , Shi Lei , Sun Jitao , Wang Qian , Yin Chongxian , Liu Ming

{"title":"Preliminary experiment study of hardware time stamp method based on event timing system","authors":"Gong Ruizhe , Shi Lei , Sun Jitao , Wang Qian , Yin Chongxian , Liu Ming","doi":"10.1016/j.nima.2025.170301","DOIUrl":"10.1016/j.nima.2025.170301","url":null,"abstract":"<div><div>The rapid advancement of free-electron laser (FEL) technology to its fourth generation introduces significant challenges in data acquisition and alignment due to high repetition frequency beams reaching up to 1 MHz (Huang et al., 2021). Traditional software-based synchronization methods, such as Network Time Protocol (NTP), fail to provide the required timestamp accuracy under these conditions. Furthermore, the White Rabbit system, though has many advanced factors, also has limitations such as relatively high hardware requirements and inflexible master clock frequency, making it suboptimal for FEL projects.</div><div>This paper presents a novel hardware timestamp scheme based on an event timing system, widely used in large scientific facilities, which simplifies wiring complexity and reduces hardware demands at the receiver end. This scheme has been successfully implemented on the DC GUN equipment at Dalian, China, and tested under 1 MHz beam current conditions. The results demonstrate that the proposed solution can provide stable and accurate timestamps with a precision of up to 10 ns.</div><div>Our scheme's compatibility with existing event timing systems ensures ease of integration and modification, facilitating enhanced data accuracy and utilization in applications such as fast track feedback and AI-driven auto-beam tuning. This design promises significant improvements in the precision and efficiency of data alignment in high-frequency beam environments.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170301"},"PeriodicalIF":1.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437822","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}

引用次数: 0

An innovative method for slow extraction in circular hadron accelerators with resonance islands and bent crystals

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-10 DOI: 10.1016/j.nima.2025.170286

Dóra Erzsébet Veres , Massimo Giovannozzi , Giuliano Franchetti

引用次数: 0

Machine learning for reactor power monitoring with limited labeled data

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-10 DOI: 10.1016/j.nima.2025.170285

C.L. Stewart , B.L. Goldblum , R.G. Abbott , L. Appleby , B.J. Borghetti , V. Hollingshead , J.H. Whetzel

{"title":"Machine learning for reactor power monitoring with limited labeled data","authors":"C.L. Stewart , B.L. Goldblum , R.G. Abbott , L. Appleby , B.J. Borghetti , V. Hollingshead , J.H. Whetzel","doi":"10.1016/j.nima.2025.170285","DOIUrl":"10.1016/j.nima.2025.170285","url":null,"abstract":"<div><div>Real-time reactor power monitoring is critical for a variety of nuclear applications, spanning safety, security, operations, and maintenance. While machine learning methods have shown promise in monitoring reactor power levels, there is limited research on their efficacy in label-starved environments. The goal of this work is to assess the feasibility of classifying nuclear reactor power level using multisource data in scenarios with limited labels. Data were collected using low-resolution multisensors at four nuclear reactor facilities: two large research reactors and two TRIGA reactors. Within each pair, one reactor dataset served as the source and the other as the target in a transfer learning paradigm. Twenty-three supervised models were trained on labeled sequences of magnetic field and acceleration data from each of the target sites. Self-learning and transfer learning methods were applied to the top performing models to assess their classification performance with increasing amounts of labeled data. While reactor power level classification was achieved with a Matthews Correlation Coefficient of up to 0.739 ± 0.003 and 0.622 ± 0.009 with only 400 sequences per power state for the large research reactor and TRIGA target sites, respectively, self-learning and transfer learning leveraging source site data did not improve target classification performance. These findings suggest that alternative methods, such as higher sensitivity sensors, digital twins, or the use of physics-informed models, are required to enable high-performance classification in machine learning approaches to reactor monitoring with a dearth of target ground truth.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170285"},"PeriodicalIF":1.5,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377627","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}

引用次数: 0

Preparation of selenium target using sedimentation method for in-beam γ-ray spectroscopic measurement

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-10 DOI: 10.1016/j.nima.2025.170288

R. Mondal Saha , K. Banerjee , A. Chakraborty , N. Gayathri , Satya Samiran Nayak , Souvik Jana , G.R. Umapathy , R. Shil , Anirban Basak , S. Bhattacharyya , Satyajit Hazra , Saif Ahmad Khan

{"title":"Preparation of selenium target using sedimentation method for in-beam γ-ray spectroscopic measurement","authors":"R. Mondal Saha , K. Banerjee , A. Chakraborty , N. Gayathri , Satya Samiran Nayak , Souvik Jana , G.R. Umapathy , R. Shil , Anirban Basak , S. Bhattacharyya , Satyajit Hazra , Saif Ahmad Khan","doi":"10.1016/j.nima.2025.170288","DOIUrl":"10.1016/j.nima.2025.170288","url":null,"abstract":"<div><div>Natural and isotopically enriched selenium targets with a typical thickness of 6.8 mg/cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> were prepared using only 20 mg of powder, which was deposited on a Mylar backing through sedimentation process. The surface morphology of these targets was examined using scanning electron microscopy, while elemental analysis was conducted through <span><math><mi>X</mi></math></span>-ray photoelectron spectroscopy, energy-dispersive <span><math><mi>X</mi></math></span>-ray spectroscopy and <span><math><mi>X</mi></math></span>-ray diffraction technique. These analyses confirmed that the selenium retained its crystalline structure, with no elemental impurities other than carbon and oxygen. The presence of carbon and oxygen was mainly due to the polyvinyl alcohol used during fabrication. The thickness of the targets was measured via <span><math><mi>X</mi></math></span>-ray attenuation using a Germanium-based Low-Energy Photon Spectrometer. These targets were subsequently employed in ion-beam-induced <span><math><mi>γ</mi></math></span>-ray spectroscopic measurements to investigate the nuclear level structure of <span><math><msup><mrow></mrow><mrow><mn>81</mn><mo>,</mo><mn>82</mn></mrow></msup></math></span>Br. Even after five days of continuous beam exposure, the condition of the targets remained unchanged. X-ray diffraction analysis of the irradiated targets showed no significant changes in microstrain and crystallite size.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170288"},"PeriodicalIF":1.5,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419355","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}

引用次数: 0

High-precision calibration of gain and characterization of single-photoelectron response in photomultiplier tubes

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-09 DOI: 10.1016/j.nima.2025.170269

Yan Wang , Kun Jiang , Kaifeng Shen , Cheng Li , Zebo Tang , Wangmei Zha

引用次数: 0

Muon absorption imaging for the density structure of metro tunnel overburden

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-08 DOI: 10.1016/j.nima.2025.170307

Jianming Zhang , Zhiwei Li , Jie Pang , Dikun Yang , Zhentao Yang , Zhongchang Chen , Guihua Long , Peng Du , Liping Huang , Tiantian Song , Kaidi Li , Menglin Cui , Feng Bao , Fang Liu , Yanhui Wang , Dongxiang Liu , Xiaoping Ouyang , Ran Han

{"title":"Muon absorption imaging for the density structure of metro tunnel overburden","authors":"Jianming Zhang , Zhiwei Li , Jie Pang , Dikun Yang , Zhentao Yang , Zhongchang Chen , Guihua Long , Peng Du , Liping Huang , Tiantian Song , Kaidi Li , Menglin Cui , Feng Bao , Fang Liu , Yanhui Wang , Dongxiang Liu , Xiaoping Ouyang , Ran Han","doi":"10.1016/j.nima.2025.170307","DOIUrl":"10.1016/j.nima.2025.170307","url":null,"abstract":"<div><div>Detecting the geological structure of the overburden above subway tunnels is crucial for the safe operation of the subway. Cosmic-ray muon, due to their strong penetration capabilities, offer a non-invasive method to probe underground structures. This study leverages muon absorption imaging technology to map the geological density variations of the overburden between Shenzhen Metro's Apollo South and Yuanshan Stations. A muon detector measured muon flux at 22 points within the tunnel, which, combined with preliminary geophysical drilling data, allowed for the estimation of average densities using the differential evolution global optimization algorithm. The results show that muon flux variations corresponded well with changes in marble content within the soil, reflecting density increases from 2.08 g/cm³ to 2.27 g/cm³ between measurement points 1 to 13, and decreases to 2.03 g/cm³ at points 14 and beyond due to river erosion effects. This study confirms the efficacy of muon absorption imaging in identifying density anomalies in tunnel overburden. By integrating prior geological information, the differential evolution algorithm enhances the precision and efficiency of stratification analysis. This novel approach offers significant potential for mitigating geological hazards and ensuring subway safety, with broader applications in other underground infrastructure and continuous monitoring systems. The findings could influence future standards in subway construction and operation, highlighting the importance of innovative methods in geological assessment and infrastructure safety.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170307"},"PeriodicalIF":1.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394661","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}

引用次数: 0

Standing wave Dielectric Disk Accelerating structure design and low power measurements

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-07 DOI: 10.1016/j.nima.2025.170283

S. Weatherly , C. Jing , E. Wisniewski , D. Doran , J. Power , B. Freemire , T. Abe , T. Higo , D. Satoh

{"title":"Standing wave Dielectric Disk Accelerating structure design and low power measurements","authors":"S. Weatherly , C. Jing , E. Wisniewski , D. Doran , J. Power , B. Freemire , T. Abe , T. Higo , D. Satoh","doi":"10.1016/j.nima.2025.170283","DOIUrl":"10.1016/j.nima.2025.170283","url":null,"abstract":"<div><div>A Dielectric Disk Accelerator (DDA) is a metallic accelerating structure loaded with dielectric disks to increase coupling between cells, thus producing a high group velocity, while still maintaining a high shunt impedance. This is crucial for achieving high efficiency, high gradient acceleration in the short rf pulse acceleration regime. Recent research of these structures has produced traveling wave structures that are powered by very short (<span><math><mo>∼</mo></math></span>9 ns), very high power (400 MW) RF pulses using two beam acceleration at the Argonne Wakefield Accelerator Complex. In testing, these structures have withstood more than 320 MW of power and produced accelerating gradients of over 100 MV/m. A new standing wave DDA structure is being fabricated for testing on the Nextef2 test stand at KEK that will be powered by a more conventional, klystron power source. Simulation results of this structure show that at 50 MW of input power, the DDA produces a 457 MV/m gradient. It also has a large shunt impedance of 160 M<span><math><mi>Ω</mi></math></span>/m and an r/Q of 21.6 k<span><math><mi>Ω</mi></math></span>/m. Cold testing of this structure was conducted this summer showing a good match with the excited field but a significantly lower matching at the working frequency.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170283"},"PeriodicalIF":1.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394695","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}

引用次数: 0

Synchrotron based sparse-view CT artifact correction with STC-UNet

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-07 DOI: 10.1016/j.nima.2025.170306

Renmu Zhang , Jun Wang , Lihua Wang , Biao Deng , Jun Hu

{"title":"Synchrotron based sparse-view CT artifact correction with STC-UNet","authors":"Renmu Zhang , Jun Wang , Lihua Wang , Biao Deng , Jun Hu","doi":"10.1016/j.nima.2025.170306","DOIUrl":"10.1016/j.nima.2025.170306","url":null,"abstract":"<div><div>Synchrotron radiation micro-CT imaging is widely used in various scientific fields as a 3D non-destructive imaging technique with high penetration, high resolution and high contrast. Roots According to the Shannon-Nyquist theorem, sufficient projection data need to be collected to obtain high-quality CT reconstructed slices. In order to improve the temporal resolution of CT, sparse data sampling methods have been proposed. However, images reconstructed from sparse view projections often have severe streak artifacts. In this paper, we propose an artifact correction method swin transformer and convolutional U-net (STC-Unet) for synchrotron sparse CT. The network is based on the structure of U-Net, which combines the local feature extraction capability of convolutional neural network and the global feature extraction capability of Transformer in the encoder part, and reduces the artifacts introduced by the single up-sampling by using a dual up-sampling module in the decoder part. The method is applied to sparse CT experiments on synchrotron radiation metal mesh samples, and the results show that the method has good results in removing artifacts while preserving structural details. Compared with other methods, the quantitative evaluation of our proposed model is significantly improved.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170306"},"PeriodicalIF":1.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387689","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}

引用次数: 0

Application of a data-driven tomography method for the Gas Electron Multiplier (GEM) based X-ray camera on EAST

IF 1.5 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-07 DOI: 10.1016/j.nima.2025.170281

Y. Hu , E. Li , C. Ma , C. Mai

引用次数: 0