Pub Date : 2025-02-14DOI: 10.1016/j.nima.2025.170328
A. Avetisyan , L. Mkrtchyan , S. Khosrovyan , L. Aloyan
This study explores the dose-dependent effects of ultrashort electron beams on DNA damage and the role of Zn-containing porphyrins in modulating this interaction. As advancements in electron beam technology continue to emerge, their potential applications in fields such as medicine and genetic engineering are becoming increasingly significant. However, the complex mechanisms governing the interaction between ultrashort electron beams and DNA remain largely uncharted. We investigated the influence of varying electron beam doses on DNA isolated from the calf thymus, as well as on DNA/porphyrin complexes. The presence of ZnTOEPyP porphyrin and its effects on radiation-induced DNA damage were examined at different relative concentrations of the complexes (r = 0.01; 0.02; 0.04, where r = Cporph./CDNA) and compared to previous findings. The study sought to uncover the potential potentiating effects of porphyrins on DNA damage, dependent on both porphyrin concentration and radiation dose. Utilizing spectroscopic melting methods in a 10−3 M NaCl buffer solution. We identified the dependence of porphyrin-induced protective or radiation-enhancing effects on the combination of relative concentration and irradiation dose.
{"title":"Investigating the impact of metalloporphyrins on DNA damage during electron beam irradiation","authors":"A. Avetisyan , L. Mkrtchyan , S. Khosrovyan , L. Aloyan","doi":"10.1016/j.nima.2025.170328","DOIUrl":"10.1016/j.nima.2025.170328","url":null,"abstract":"<div><div>This study explores the dose-dependent effects of ultrashort electron beams on DNA damage and the role of Zn-containing porphyrins in modulating this interaction. As advancements in electron beam technology continue to emerge, their potential applications in fields such as medicine and genetic engineering are becoming increasingly significant. However, the complex mechanisms governing the interaction between ultrashort electron beams and DNA remain largely uncharted. We investigated the influence of varying electron beam doses on DNA isolated from the calf thymus, as well as on DNA/porphyrin complexes. The presence of ZnTOEPyP porphyrin and its effects on radiation-induced DNA damage were examined at different relative concentrations of the complexes (r = 0.01; 0.02; 0.04, where r = C<sub>porph.</sub>/C<sub>DNA</sub>) and compared to previous findings. The study sought to uncover the potential potentiating effects of porphyrins on DNA damage, dependent on both porphyrin concentration and radiation dose. Utilizing spectroscopic melting methods in a 10<sup>−3</sup> M NaCl buffer solution. We identified the dependence of porphyrin-induced protective or radiation-enhancing effects on the combination of relative concentration and irradiation dose.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170328"},"PeriodicalIF":1.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419331","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}
A novel kind of tritium detector for in-line tritium measurements for DT fuels recycling system in fusion research has been developed, which is capable of measuring tritium concentration by detecting the signal induced by electrons emitted in tritium beta decay directly without the application of voltage. This power-free tritium detector (PTD) is a compact type with sensitive volume only 0.7 mL, and it can be installed in-line and provide the real-time tritium concentration for the tritium processing. The response time of PTD is around 4.8 s when it is used as the detector of micro Gas Chromatography (micro-GC) in isotope separation system for fusion fuel system. Furthermore, the sensitivity of PTD is estimated to be as low as 3.2 ppm in the experiments. Characterized by a compact design, fast response time and high sensitivity, the PTD is able to be directly integrated within tritium fuel systems to facilitate the achievement of process control, tritium accountancy and radiation protection in fusion research.
{"title":"Power-free tritium detector for DT fuels in fusion research","authors":"Zhilin Chen, Yang Yang, Ping Chen, Shenghan Cheng, Yu Li, Wenxiang Jiang","doi":"10.1016/j.nima.2025.170332","DOIUrl":"10.1016/j.nima.2025.170332","url":null,"abstract":"<div><div>A novel kind of tritium detector for in-line tritium measurements for DT fuels recycling system in fusion research has been developed, which is capable of measuring tritium concentration by detecting the signal induced by electrons emitted in tritium beta decay directly without the application of voltage. This power-free tritium detector (PTD) is a compact type with sensitive volume only 0.7 mL, and it can be installed in-line and provide the real-time tritium concentration for the tritium processing. The response time of PTD is around 4.8 s when it is used as the detector of micro Gas Chromatography (micro-GC) in isotope separation system for fusion fuel system. Furthermore, the sensitivity of PTD is estimated to be as low as 3.2 ppm in the experiments. Characterized by a compact design, fast response time and high sensitivity, the PTD is able to be directly integrated within tritium fuel systems to facilitate the achievement of process control, tritium accountancy and radiation protection in fusion research.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170332"},"PeriodicalIF":1.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444703","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}
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.
{"title":"Radiation from electrons channeled in the system of fan-oriented half-wavelength crystals","authors":"O.V. Bogdanov , V.F. Grichshenko , G.I. Gordienko , D. Ismailov , 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}
Pub Date : 2025-02-13DOI: 10.1016/j.nima.2025.170287
Loic Amoudry , Maksim Kravchenko , Robert Berry , Nathan Burger , Amirari Diego , Jonathan Edelen , Marcos Ruelas , Ronald Agustsson , Gerard Andonian , Yung-Chuan Chen , Dmitriy Gavryushkin , Tara Hodgetts , Alex Murokh
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.
{"title":"Commissioning of a photocathode and interaction laser system at RadiaBeam compact inverse Compton light source","authors":"Loic Amoudry , Maksim Kravchenko , Robert Berry , Nathan Burger , Amirari Diego , Jonathan Edelen , Marcos Ruelas , Ronald Agustsson , Gerard Andonian , Yung-Chuan Chen , Dmitriy Gavryushkin , Tara Hodgetts , 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/e<sup>2</sup>) on the photocathode and 40 μm (1/e<sup>2</sup>) 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}
Pub Date : 2025-02-13DOI: 10.1016/j.nima.2025.170292
Nathan M. Cook , Dan T. Abell , Morgan Henderson , Ilya Pogorelov , Calcifer Phillips , Philippe Piot
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.
{"title":"Efficient modeling of structure-based wakefield accelerators via separated representations","authors":"Nathan M. Cook , Dan T. Abell , Morgan Henderson , Ilya Pogorelov , Calcifer Phillips , 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}
Pub Date : 2025-02-13DOI: 10.1016/j.nima.2025.170323
Kuinian Li , Yonglin Wei , Hulin Liu , Ping Chen , Luanxuan He , Riguang Chen , Xinnan Zhao , Dingjun Zhou , Jinshou Tian , Shengli Wu
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.
{"title":"Experimental investigation of saturation recovery behavior in MCP-PMT","authors":"Kuinian Li , Yonglin Wei , Hulin Liu , Ping Chen , Luanxuan He , Riguang Chen , Xinnan Zhao , Dingjun Zhou , Jinshou Tian , 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/cm<sup>2</sup>. 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}
Pub Date : 2025-02-13DOI: 10.1016/j.nima.2025.170315
A.D. Khudyakova , A.A. Savchenko , W. Wagner
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.
{"title":"Cauchy-like approximation of continuous crystal potential for axially channeled electrons","authors":"A.D. Khudyakova , A.A. Savchenko , 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}
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.
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.
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.
{"title":"On the development and introduction of a territorial anti-seismic early warning and protection system in Armenia","authors":"S.A. Mkhitaryan , M.A. Hovhannisyan , A.R. Mnatsakanyan , K.S. Mkhitaryan , V.K. Sissakian , V. Baiocchi , A.M. Minasyan , A.H. Mkrtchyan , 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}
Pub Date : 2025-02-12DOI: 10.1016/j.nima.2025.170289
Di Yin , Yanru Wei , Huiping Geng , Yudong Liu , Yuan Zhang , Jinliu Su , Zhi Liu , Hongfei Ji , Jun Xing , Weibin Liu , Junhui Yue , Chenghui Yu
Recently, the routine operational peak luminosity of BEPCII at 1.89 GeV has reached . The tuning of the transverse multi-bunch feedback system has effectively mitigated the oscillations of the coherent beam-beam 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.
{"title":"Recent advances of experiment and simulation on luminosity performance at BEPCII","authors":"Di Yin , Yanru Wei , Huiping Geng , Yudong Liu , Yuan Zhang , Jinliu Su , Zhi Liu , Hongfei Ji , Jun Xing , Weibin Liu , Junhui Yue , 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}
Pub Date : 2025-02-12DOI: 10.1016/j.nima.2025.170252
Lingqin Kong , Lei Shuai , Xiuzuo Liang , XiaoMing Wang , Xuanhou Hu , Yiwen Zhang , Kai Zhuang , Meichan Feng , Yu Xi , Yuzhong Feng , Long Wei
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.
{"title":"Preliminary study of time-encoding imaging based on multiple-ring rotation modulation collimator","authors":"Lingqin Kong , Lei Shuai , Xiuzuo Liang , XiaoMing Wang , Xuanhou Hu , Yiwen Zhang , Kai Zhuang , Meichan Feng , Yu Xi , Yuzhong Feng , 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}
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