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

{"title":"Radiation from electrons channeled in the system of fan-oriented half-wavelength crystals","authors":"O.V. Bogdanov ,&nbsp;V.F. Grichshenko ,&nbsp;G.I. Gordienko ,&nbsp;D. Ismailov ,&nbsp;T.A. Tukhfatullin","doi":"10.1016/j.nima.2025.170326","DOIUrl":"10.1016/j.nima.2025.170326","url":null,"abstract":"<div><div>The interaction of a 255 MeV electron beam with a system of three fan-oriented half-wavelength Si crystal was studied through the simulation. The angular beam profiles in each crystal of the system were calculated and the channeling radiation spectra in forward direction were investigated.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170326"},"PeriodicalIF":1.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474476","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":"Commissioning of a photocathode and interaction laser system at RadiaBeam compact inverse Compton light source","authors":"Loic Amoudry ,&nbsp;Maksim Kravchenko ,&nbsp;Robert Berry ,&nbsp;Nathan Burger ,&nbsp;Amirari Diego ,&nbsp;Jonathan Edelen ,&nbsp;Marcos Ruelas ,&nbsp;Ronald Agustsson ,&nbsp;Gerard Andonian ,&nbsp;Yung-Chuan Chen ,&nbsp;Dmitriy Gavryushkin ,&nbsp;Tara Hodgetts ,&nbsp;Alex Murokh","doi":"10.1016/j.nima.2025.170287","DOIUrl":"10.1016/j.nima.2025.170287","url":null,"abstract":"<div><div>In the context of building a compact Inverse Compton Scattering X-ray source, an Yb:YAG laser was used to generate both the electron emission from a photocathode and act as the interaction laser on a 100 MeV inverse Compton scattering experiment. The laser generates 25 mJ pulses at 1030 nm, 1.5 ps long, up to 120 Hz. 10 % of the energy is sent into a Fourth Harmonic Generation (FHG) module where frequency doubling happens twice. Up to 200 μJ of adjustable UV laser can be exploited and sent towards the photocathode. The rest of the energy, 90 % of the initial IR beam, is propagated to the interaction region. The goal is to match a 1 mm beam diameter (flat-top, 1/e²) on the photocathode and 40 μm (1/e²) at the interaction region with high stability. To reach it, significant effort was put into optimization using state of the art laser propagation software and various tools like low aberrations lenses, truncated Gaussian beam, vacuum transport, relay of images, and closed loop stabilization system. In the end, this project pairs strong optical and mechanical constraints. A significant part of it was built and commissioned, showing exciting results. We will describe the whole laser system together with the various steps to reach the accelerator's needs, and the current achievements.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1075 ","pages":"Article 170287"},"PeriodicalIF":1.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479491","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":"Efficient modeling of structure-based wakefield accelerators via separated representations","authors":"Nathan M. Cook ,&nbsp;Dan T. Abell ,&nbsp;Morgan Henderson ,&nbsp;Ilya Pogorelov ,&nbsp;Calcifer Phillips ,&nbsp;Philippe Piot","doi":"10.1016/j.nima.2025.170292","DOIUrl":"10.1016/j.nima.2025.170292","url":null,"abstract":"<div><div>Structure-based wakefield accelerators (SWFA) promise orders of magnitude improvements in accelerating gradient over conventional approaches and have been identified as a candidate technology for future applications ranging from compact free electron lasers to multi-TeV lepton colliders. However, achieving the desired beam energy and quality can require meter-scale structures with tight tolerances, introducing new constraints on structure and beam characteristics to minimize emittance growth and combat transverse instabilities. High fidelity and self-consistent simulations of high brightness beams over these lengths necessitate enormous computational resources, making parametric studies of novel structures or instability-mitigation schemes unfeasible with standard practices. We present a technique for decomposing high dimensional wakefield systems into a set of lower dimensional components, capable of accurately reconstructing the structure response in a fraction of the time. We discuss the approach and implementation of this technique using Green’s Functions for common structure geometries. We demonstrate the potential for significant reduction in computation times and memory footprint using such representations, with extensions to higher dimensions.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170292"},"PeriodicalIF":1.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437753","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":"Experimental investigation of saturation recovery behavior in MCP-PMT","authors":"Kuinian Li ,&nbsp;Yonglin Wei ,&nbsp;Hulin Liu ,&nbsp;Ping Chen ,&nbsp;Luanxuan He ,&nbsp;Riguang Chen ,&nbsp;Xinnan Zhao ,&nbsp;Dingjun Zhou ,&nbsp;Jinshou Tian ,&nbsp;Shengli Wu","doi":"10.1016/j.nima.2025.170323","DOIUrl":"10.1016/j.nima.2025.170323","url":null,"abstract":"<div><div>The MCP-PMT is a single-photon sensitive detector with a time resolution of tens of picoseconds. Utilizing ALD technology to fabricate nanofilms on the inner surfaces of microchannel plates significantly prolongs the lifetime of the MCP-PMT, enabling it to achieve an integrated anode charge exceeding 10 C/cm². However, for the long-lifetime MCP-PMTs using ALD technology, high counting rate saturation can lead to recovery time extending over several hours. This study presents experimental research on the saturation recovery behavior of MCP-PMTs fabricated with varying ALD layer thicknesses. The results suggest that the saturation recovery behavior is influenced by factors such as ALD layer thickness, MCP gain, saturation degree, and saturation duration. Specifically, a thicker ALD layer, deeper saturation, and longer saturation duration are associated with longer recovery time. When the output charge is constant, increasing the MCP gain has been demonstrated to decrease the recovery time from saturation. This paper clarifies the experimental findings by analyzing charge accumulation on the oxide film layer. The composition of the secondary electron emission layer on the microchannel plate's inner wall determines the polarity of the charges accumulating on its surface, which in turn dictates the saturation recovery behavior.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170323"},"PeriodicalIF":1.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419330","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":"Cauchy-like approximation of continuous crystal potential for axially channeled electrons","authors":"A.D. Khudyakova ,&nbsp;A.A. Savchenko ,&nbsp;W. Wagner","doi":"10.1016/j.nima.2025.170315","DOIUrl":"10.1016/j.nima.2025.170315","url":null,"abstract":"<div><div>We present advancements in the development of a computer program designed to simulate channeling radiation based on classical approaches. Our work focuses on optimizing the code to enable faster simulations of axial channeling radiation produced by relativistic electrons in germanium (Ge) and silicon (Si) single crystals. By introducing a Cauchy-like approximation for describing the axial potential, we replace the traditional Doyle-Turner approximation, resulting in a substantial improvement in computational efficiency and 14-fold increase in simulation speed. These enhancements not only accelerate the simulation process but also show rather accurate predictions of channeling radiation characteristics in various crystalline materials.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170315"},"PeriodicalIF":1.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437752","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":"On the development and introduction of a territorial anti-seismic early warning and protection system in Armenia","authors":"S.A. Mkhitaryan ,&nbsp;M.A. Hovhannisyan ,&nbsp;A.R. Mnatsakanyan ,&nbsp;K.S. Mkhitaryan ,&nbsp;V.K. Sissakian ,&nbsp;V. Baiocchi ,&nbsp;A.M. Minasyan ,&nbsp;A.H. Mkrtchyan ,&nbsp;H.R. Drmeyan","doi":"10.1016/j.nima.2025.170317","DOIUrl":"10.1016/j.nima.2025.170317","url":null,"abstract":"<div><div>The study of international experience shows that the advances in designing and introducing earthquake early warning systems (EEWS) significantly improved the effectiveness and feasibility of short-term early warnings of upcoming earthquake shakes and the use of territorial EEWSs in many countries. Despite the universal recognition of the EEWSs' efficiency in many countries and their encouraging experiences, no any territorial EEWS has yet been designed and implemented in the Republic of Armenia (RA), although the RA has painful statistics on the terrible human losses and immense material damages caused by previous devastating earthquakes, country's continues high seismicity and seismic risks, and the low seismic resistance of many objects.</div><div>Thus, from the point of view of increasing the RA seismic safety, the designing, creation, and introduction of a combined integrated territorial EEWS allowing advanced anti-seismic protection of the most important objects and public early warning is an important issue which was included in the IAPP NAS RA scientific research activities. On the other side, the comparative analyses of the specifics of the RA territory, including the distribution of seismic sources and the network of seismic stations with the operating EEWSs' various working principles, algorithms, and architectures show that none of the EEWSs’ on-site (local) or regional (network) algorithms and architectures used can be applied in the proposed Armenian EEWS.</div><div>Due to the above we started initial studies on designing an appropriate hybrid algorithm and architecture for the proposed desirable EEWS effective operation adapted to the RA specifics. In this context, we have begun particularly to study the international experience of the EEWSs’ designing, introduction, and operation, assessment of the need, possibility, and feasibility of creating a territorial effective EEW system for Armenia, comparison of algorithms and principles used in existing EEW systems and their capabilities with the specifics of Armenia.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170317"},"PeriodicalIF":1.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419332","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":"Recent advances of experiment and simulation on luminosity performance at BEPCII","authors":"Di Yin ,&nbsp;Yanru Wei ,&nbsp;Huiping Geng ,&nbsp;Yudong Liu ,&nbsp;Yuan Zhang ,&nbsp;Jinliu Su ,&nbsp;Zhi Liu ,&nbsp;Hongfei Ji ,&nbsp;Jun Xing ,&nbsp;Weibin Liu ,&nbsp;Junhui Yue ,&nbsp;Chenghui Yu","doi":"10.1016/j.nima.2025.170289","DOIUrl":"10.1016/j.nima.2025.170289","url":null,"abstract":"<div><div>Recently, the routine operational peak luminosity of BEPCII at 1.89 GeV has reached <span><math><mrow><mn>1</mn><mo>.</mo><mn>0</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>33</mn></mrow></msup><mspace></mspace><msup><mrow><mtext>cm</mtext></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup><msup><mrow><mtext>s</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span>. The tuning of the transverse multi-bunch feedback system has effectively mitigated the oscillations of the coherent beam-beam <span><math><mi>π</mi></math></span> mode in the horizontal direction, increasing the peak luminosity by approximately 20%. This paper introduces the commissioning process and discusses the observed beam phenomena. Additionally, the underlying mechanisms have been examined through simulations and are now well understood. A preliminary experiment on top-up injection has also been conducted with optimized configurations of the feedback system, demonstrating the potential of top-up injection near 1.89 GeV at BEPCII.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170289"},"PeriodicalIF":1.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419354","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":"Preliminary study of time-encoding imaging based on multiple-ring rotation modulation collimator","authors":"Lingqin Kong ,&nbsp;Lei Shuai ,&nbsp;Xiuzuo Liang ,&nbsp;XiaoMing Wang ,&nbsp;Xuanhou Hu ,&nbsp;Yiwen Zhang ,&nbsp;Kai Zhuang ,&nbsp;Meichan Feng ,&nbsp;Yu Xi ,&nbsp;Yuzhong Feng ,&nbsp;Long Wei","doi":"10.1016/j.nima.2025.170252","DOIUrl":"10.1016/j.nima.2025.170252","url":null,"abstract":"<div><div>For environmental radiation monitoring, the rotational modulation collimator (RMC) imaging system is considered as a promising imaging method with little complexity of the system. In this study, we have proposed a new collimator style of rotating modulation collimator and proven the feasibility of the imaging system through imaging experiments, which provides a research basis for the subsequent improvement design and algorithm optimization of RMC imaging system.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170252"},"PeriodicalIF":1.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429890","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":"Pion photoproduction on a deuteron at the VEPP-3 electron beam","authors":"Yu.M. Cherepennikov ,&nbsp;E.M. Darwish ,&nbsp;A.I. Fix ,&nbsp;V.V. Gauzshtein ,&nbsp;M.I. Levchuk ,&nbsp;A. Yu Loginov ,&nbsp;D.M. Nikolenko ,&nbsp;I.A. Rachek ,&nbsp;Yu.V. Shestakov ,&nbsp;M.V. Shevelev ,&nbsp;D.K. Toporkov ,&nbsp;A.V. Yurchenko ,&nbsp;S.A. Zevakov","doi":"10.1016/j.nima.2025.170316","DOIUrl":"10.1016/j.nima.2025.170316","url":null,"abstract":"<div><div>In this paper, we present a review of the experiment devoted to the study of the pion photoproduction on a tensor-polarized deuteron target performed with the use of the VEPP-3 electron beam in 2013. The connection between the electro- and photoreactions on the deuteron is described. The methods for analyzing the experimental statistics and estimating the inseparable background with the use of the GEANT4 package and the GENBOS photoreaction generator are presented.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170316"},"PeriodicalIF":1.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429891","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":"Finite Rayleigh length in Compton backscattering","authors":"Dmitrii V. Gavrilenko ,&nbsp;Alexander P. Potylitsyn ,&nbsp;Alexey A. Tishchenko","doi":"10.1016/j.nima.2025.170314","DOIUrl":"10.1016/j.nima.2025.170314","url":null,"abstract":"<div><div>In this paper, an approach is proposed to take into account the influence of the finite Rayleigh length of a laser beam on the number of scattered photons in the process of inverse Compton scattering. The method is based on the calculation of the overlap integral between the particle distribution density functions in electron and photon beams, taking into account the change in their sizes and in a total cross section during the collision. It is shown that this effect can have a significant impact on the total number of scattered photons, reducing it. It occurs even at the Rayleigh lengths exceeding the dimensions of the interaction region. We estimated the effect for the parameters of LUXE facility and found it to be very weak. At the same time, for Gauss-Laguerre beams, in which due to the superoscillation effect the Rayleigh length seems to be able to reach very small values, we predict that the effect of the finite Rayleigh length in Compton backscattering will be very distinct, reaching about 20% or more.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170314"},"PeriodicalIF":1.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421645","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}