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

Interplay of space charge, intrabeam scattering, and synchrotron radiation in the Compact Linear Collider damping rings 紧凑直线对撞机阻尼环中空间电荷、束内散射和同步辐射的相互作用

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-06-12 DOI: 10.1103/physrevaccelbeams.27.064403

M. Zampetakis, F. Antoniou, F. Asvesta, H. Bartosik, Y. Papaphilippou

{"title":"Interplay of space charge, intrabeam scattering, and synchrotron radiation in the Compact Linear Collider damping rings","authors":"M. Zampetakis, F. Antoniou, F. Asvesta, H. Bartosik, Y. Papaphilippou","doi":"10.1103/physrevaccelbeams.27.064403","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.064403","url":null,"abstract":"Future ultralow emittance rings for <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>e</mi><mo>−</mo></msup><mo>/</mo><msup><mi>e</mi><mo>+</mo></msup></math> colliders require extremely high beam brightness and can thus be limited by collective effects. In this paper, the interplay of effects such as synchrotron radiation, intrabeam scattering (IBS), and space charge in the vicinity of excited betatron resonances is assessed. In this respect, two algorithms were developed to simulate IBS and synchrotron radiation effects and integrated in the pyorbit tracking code, to be combined with its widely used space charge module. The impact of these effects on the achievable beam parameters of the Compact Linear Collider (CLIC) damping rings was studied, showing that synchrotron radiation damping mitigates the adverse effects of IBS and space charge induced resonance crossing. The studies include also a full dynamic simulation of the CLIC damping ring cycle starting from the injection beam parameters. It is demonstrated that a careful working point choice is necessary, in order to accommodate the transition from detuning induced by lattice nonlinearities to space-charge dominated detuning and thereby avoid excessive losses and emittance growth generated in the vicinity of strong resonances.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141553075","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

Design study of a low emittance complex bend achromat lattice 低发射率复合弯曲消色差晶格的设计研究

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-06-11 DOI: 10.1103/physrevaccelbeams.27.061601

Minghao Song, Timur Shaftan

引用次数: 0

Luminosity and beam-induced background studies for the Cool Copper Collider 冷铜对撞机的光度和光束诱导背景研究

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-06-11 DOI: 10.1103/physrevaccelbeams.27.061001

Dimitrios Ntounis, Emilio Alessandro Nanni, Caterina Vernieri

{"title":"Luminosity and beam-induced background studies for the Cool Copper Collider","authors":"Dimitrios Ntounis, Emilio Alessandro Nanni, Caterina Vernieri","doi":"10.1103/physrevaccelbeams.27.061001","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.061001","url":null,"abstract":"A high-energy electron-positron collider has been widely recognized by the particle physics community to be the next crucial step for detailed studies of the Higgs boson and other fundamental particles and processes. Several proposals for such colliders, either linear or circular, are currently under evaluation. Any such collider will be required to reach high lumimosities, in order to collect enough data at a reasonable time scale, while at the same time coping with high rates of background particles produced from beam-beam interactions during the collisions. In this paper, we analyze the luminosity and beam-beam interaction characteristics of the Cool Copper Collider (<math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mrow><mi mathvariant=\"normal\">C</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math>) and perform a comparison with other linear collider proposals. We conclude that <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mrow><mi mathvariant=\"normal\">C</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math> can reach the same or higher collision rates as the other proposals, without having to cope with higher beam-induced background fluxes. Thus, <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mrow><mi mathvariant=\"normal\">C</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math> emerges as an attractive option for a future electron-positron collider, benefiting from the collective advancements in beam delivery and final focus system technologies developed by other linear collider initiatives.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141553175","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

Analytic formulas for the D-mode Robinson instability D 模式罗宾逊不稳定性的解析公式

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-06-07 DOI: 10.1103/physrevaccelbeams.27.064402

Tianlong He, Weiwei Li, Zhenghe Bai, Weimin Li

{"title":"Analytic formulas for the \u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mi>D</mml:mi></mml:math>\u0000-mode Robinson instability","authors":"Tianlong He, Weiwei Li, Zhenghe Bai, Weimin Li","doi":"10.1103/physrevaccelbeams.27.064402","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.064402","url":null,"abstract":"The passive superconducting harmonic cavity (PSHC) scheme is adopted by several existing and future synchrotron light source storage rings, as it has a relatively smaller R/Q and a relatively larger quality factor (Q), which can effectively reduce the beam-loading effect and suppress the mode-one instability. By using a minimum search algorithm to solve the mode-zero Robinson instability equation of uniformly filled rigid bunches, we have revealed that the fundamental mode of PSHC with a large loaded Q possibly triggers the D-mode Robinson instability [T. He , Mode-zero Robinson instability in the presence of passive superconducting harmonic cavities, ]. This instability is a mode-zero coupled bunch instability, with an oscillation frequency close to the PSHC detuning (D-mode). Uniquely, it is anti-damped by the radiation damping effect. In this paper, we derive analytical formulas for the frequency and growth rate of the D-mode Robinson instability by taking several appropriate approximations. These formulas provide crucial insights for analyzing and understanding the D-mode Robinson instability.\u0000 \u0000 \u0000 \u0000 \u0000 Published by the American Physical Society\u0000 2024\u0000 \u0000 \u0000","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141375337","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 dynamics framework incorporating acceleration to define the minimum aperture in two focusing schemes for proton radiotherapy linac 结合加速度的光束动力学框架，在质子放射治疗直列加速器的两种聚焦方案中确定最小孔径

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.27.064401

M. Southerby, R. Apsimon

引用次数: 0

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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}

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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