Physical Review Accelerators and Beams最新文献_第6页

Incoherent tune measurement of an ion storage ring using single ions 利用单离子对离子存储环进行不连贯调谐测量

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-06-04 DOI: 10.1103/physrevaccelbeams.27.062801

T. Liao, C. Guo, X. L. Yan, X. Zhou, Y. M. Xing, M. Wang, Y. J. Yuan, Y. H. Zhang, X. H. Zhou, M. Zhang, W. W. Ge, H. Y. Jiao, Y. L. Jiang, L. J. Mao, R. J. Chen, C. Y. Fu, R. S. Mao, J. C. Yang, S. A. Litvinov, Yu. A. Litvinov

{"title":"Incoherent tune measurement of an ion storage ring using single ions","authors":"T. Liao, C. Guo, X. L. Yan, X. Zhou, Y. M. Xing, M. Wang, Y. J. Yuan, Y. H. Zhang, X. H. Zhou, M. Zhang, W. W. Ge, H. Y. Jiao, Y. L. Jiang, L. J. Mao, R. J. Chen, C. Y. Fu, R. S. Mao, J. C. Yang, S. A. Litvinov, Yu. A. Litvinov","doi":"10.1103/physrevaccelbeams.27.062801","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.062801","url":null,"abstract":"The measurement of betatron tunes is important in the studies of beam dynamics in circular accelerators. Here, we report a new method to extract the fractional tune values using revolution times of single ions stored for a few hundred turns in a heavy-ion storage ring utilizing a single time-of-flight detector. The experiment was done at the experimental Cooler Storage Ring (CSRe) in Lanzhou. The unbunched cocktail secondary beam was injected into the ring and allowed to coast without further excitation. Since the average number of simultaneously stored ions inside the 128.8 m-circumference ring was merely <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>∼</mo><mn>20</mn></math>, the obtained tune values are considered to be incoherent. Given that the revolution time of an individual ion is related to its momentum, the chromaticity of the ring could be addressed. Moreover, the data indicate a possible beam mismatch in vertical direction <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mover accent=\"true\"><mi>y</mi><mo stretchy=\"false\">^</mo></mover></math> at the injection into CSRe. The new method is developed for ultralow beam intensities and is thus a sensitive approach to tune measurements. Thanks to its simplicity, the method can straightforwardly be employed at other circular accelerators by applying the same detection approach.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":"72 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141258967","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

Improving the beam quality of the low-energy muon beamline at Paul Scherrer Institute: Characterization of ultrathin carbon foils 提高保罗-舍勒研究所低能μ介子光束线的光束质量：超薄碳箔的表征

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-30 DOI: 10.1103/physrevaccelbeams.27.054501

Gianluca Janka, Zaher Salman, Andreas Suter, Thomas Prokscha, Maria Mendes Martins, Xiaojie Ni

{"title":"Improving the beam quality of the low-energy muon beamline at Paul Scherrer Institute: Characterization of ultrathin carbon foils","authors":"Gianluca Janka, Zaher Salman, Andreas Suter, Thomas Prokscha, Maria Mendes Martins, Xiaojie Ni","doi":"10.1103/physrevaccelbeams.27.054501","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.054501","url":null,"abstract":"The low-energy muon (LEM) beamline at the Paul Scherrer Institute currently stands as the world’s only facility providing a continuous beam of low-energy muons with keV energies for conducting muon spin rotation experiments on a nanometer depth scale in heterostructures and near a sample’s surface. As such, optimizing the beam quality to reach its full potential is of paramount importance. One of the ongoing efforts is dedicated to improving the already applied technique of single muon tagging through the detection of secondary electrons emerging from an ultrathin carbon foil. In this work, we present the results from installing a thinner foil with a nominal thickness of <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>0.5</mn><mtext> </mtext><mtext> </mtext><mi mathvariant=\"normal\">μ</mi><mi mathvariant=\"normal\">g</mi></mrow><mrow><mtext> </mtext><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math> and compare its performance to that of the previously installed foil with a nominal thickness of <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mrow><mn>2.0</mn><mtext> </mtext><mtext> </mtext><mi mathvariant=\"normal\">μ</mi><mi mathvariant=\"normal\">g</mi><mtext> </mtext></mrow><mrow><msup><mrow><mi>cm</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></mrow></math>. Our findings indicate improved beam quality, characterized by smaller beam spots, reduced energy loss and straggling of the muons, and enhanced tagging efficiency. Additionally, we introduce a method utilizing blue laser irradiation for cleaning the carbon foil, further improving and maintaining its characteristics.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":"49 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189800","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

Extended interaction length laser-driven acceleration in a tunable dielectric structure 可调介电结构中的扩展相互作用长度激光驱动加速度

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-30 DOI: 10.1103/physrevaccelbeams.27.051303

Sophie Crisp, Alexander Ody, Joel England, Pietro Musumeci

引用次数: 0

Bridging the gap between machine learning and particle accelerator physics with high-speed, differentiable simulations 利用高速可微分模拟缩小机器学习与粒子加速器物理学之间的差距

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-28 DOI: 10.1103/physrevaccelbeams.27.054601

Jan Kaiser, Chenran Xu, Annika Eichler, Andrea Santamaria Garcia

{"title":"Bridging the gap between machine learning and particle accelerator physics with high-speed, differentiable simulations","authors":"Jan Kaiser, Chenran Xu, Annika Eichler, Andrea Santamaria Garcia","doi":"10.1103/physrevaccelbeams.27.054601","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.054601","url":null,"abstract":"Machine learning has emerged as a powerful solution to the modern challenges in accelerator physics. However, the limited availability of beam time, the computational cost of simulations, and the high dimensionality of optimization problems pose significant challenges in generating the required data for training state-of-the-art machine learning models. In this work, we introduce cheetah, a pytorch-based high-speed differentiable linear beam dynamics code. cheetah enables the fast collection of large datasets by reducing computation times by multiple orders of magnitude and facilitates efficient gradient-based optimization for accelerator tuning and system identification. This positions cheetah as a user-friendly, readily extensible tool that integrates seamlessly with widely adopted machine learning tools. We showcase the utility of cheetah through five examples, including reinforcement learning training, gradient-based beamline tuning, gradient-based system identification, physics-informed Bayesian optimization priors, and modular neural network surrogate modeling of space charge effects. The use of such a high-speed differentiable simulation code will simplify the development of machine learning-based methods for particle accelerators and fast-track their integration into everyday operations of accelerator facilities.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":"69 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141168295","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

Beam loss detection based on generation of Cherenkov light in optical fibers in the CERN Linear Electron Accelerator for Research 基于在欧洲核子研究中心研究用直线电子加速器的光纤中产生切伦科夫光的光束损耗探测技术

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-28 DOI: 10.1103/physrevaccelbeams.27.052901

S. Benítez, B. Salvachúa, M. Chen

引用次数: 0

Off-energy operation for the Extremely Brilliant Source at the European Synchrotron Radiation Facility 欧洲同步辐射设施极亮光源的离能运行

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-28 DOI: 10.1103/physrevaccelbeams.27.051601

L. Valle, T. Brochard, N. Carmignani, L. R. Carver, J. Chavanne, F. Ewald, G. Le Bec, S. M. Liuzzo, T. Perron, J. Reyes-Herrera, P. Raimondi, K. Scheidt, R. Versteegen, J. Wade, S. White

引用次数: 0

Wakefield generation in hydrogen and lithium plasmas at FACET-II: Diagnostics and first beam-plasma interaction results FACET-II 氢和锂等离子体中的瓦基弗生成：诊断和首次光束-等离子体相互作用结果

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-24 DOI: 10.1103/physrevaccelbeams.27.051302

D. Storeyet al.

{"title":"Wakefield generation in hydrogen and lithium plasmas at FACET-II: Diagnostics and first beam-plasma interaction results","authors":"D. Storeyet al.","doi":"10.1103/physrevaccelbeams.27.051302","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.051302","url":null,"abstract":"Plasma wakefield acceleration provides ultrahigh acceleration gradients of tens of GeV/m, providing a novel path toward efficient, compact, TeV-scale linear colliders, and high brightness free electron lasers. Critical to the success of these applications is demonstrating simultaneously high gradient acceleration, high energy transfer efficiency, and preservation of emittance, charge, and energy spread. Experiments at the FACET-II National User Facility at SLAC National Accelerator Laboratory aim to achieve all of these milestones in a single-stage plasma wakefield accelerator, providing a 10 GeV energy gain in a <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo form=\"prefix\"><</mo><mn>1</mn><mtext> </mtext><mtext> </mtext><mi mathvariant=\"normal\">m</mi></math> plasma with high energy transfer efficiency. Such a demonstration depends critically on diagnostics able to measure emittance with mm mrad accuracy, energy spectra to determine both percent level energy spread, and broadband energy gain and loss, incoming longitudinal phase space, and matching dynamics. This paper discusses the experimental setup at FACET-II, including the incoming beam parameters from the FACET-II linac, plasma sources, and diagnostics developed to meet this challenge. Initial progress on the generation of beam ionized wakes in meter-scale hydrogen gas is discussed as well as commissioning of the plasma sources and diagnostics.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":"31 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141146423","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

Editorial: Coauthor! Coauthor! 社论：共同作者合著者

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-21 DOI: 10.1103/physrevaccelbeams.27.050001

Randall D. Kamien, Daniel Ucko

引用次数: 0

All-optical source size and emittance measurements of laser-accelerated electron beams 激光加速电子束的全光源尺寸和发射率测量

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-20 DOI: 10.1103/physrevaccelbeams.27.052803

F. C. Salgado, A. Kozan, D. Seipt, D. Hollatz, P. Hilz, M. Kaluza, A. Sävert, A. Seidel, D. Ullmann, Y. Zhao, M. Zepf

引用次数: 0

Longitudinal phase space diagnostics with a nonmovable corrugated passive wakefield streaker 利用不可移动的波纹状被动若飞条纹器进行纵向相空间诊断

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-20 DOI: 10.1103/physrevaccelbeams.27.050702

Philipp Dijkstal, Weilun Qin, Sergey Tomin

引用次数: 0