Physical Review Accelerators and Beams最新文献_第7页

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

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

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Reconstructing phase space of injection beam based on the measurement of accumulated beam: A novel tomography algorithm and its applications 基于累积光束的测量重建注入光束的相空间：新型层析成像算法及其应用

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.27.052804

H. Y. Liu, S. Y. Xu, M. T. Li, Y. S. Yuan, L. S. Huang, X. Y. Feng, S. Wang

{"title":"Reconstructing phase space of injection beam based on the measurement of accumulated beam: A novel tomography algorithm and its applications","authors":"H. Y. Liu, S. Y. Xu, M. T. Li, Y. S. Yuan, L. S. Huang, X. Y. Feng, S. Wang","doi":"10.1103/physrevaccelbeams.27.052804","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.052804","url":null,"abstract":"The measurement of phase space has always been an important topic in the field of accelerator physics, playing an indispensable role in understanding the beam dynamics. The phase space distribution of the injected beam is crucial for optimizing the multiturn accumulation injection process in synchrotrons. However, directly and accurately measuring the phase space distribution is a challenging task. In this study, we propose an innovative tomographic algorithm based on the measurement data of the accumulated beam profile obtained from the wall current monitor (WCM) in a synchrotron, to reconstruct the longitudinal phase space of the injected beam. Simulations were conducted for various initial distribution scenarios, and the results showed that this algorithm can achieve a difference of about 4% in the rms momentum spread between the initial and reconstructed phase space distribution of the injected beam. This algorithm has been applied to the China Spallation Neutron Source and successfully measured the momentum spread of the injected beam. Machine studies considering the phase error of the injected beam showed a high consistency between the reconstructed beam profiles and the measurement results from the WCM on Rapid Cycling Synchrotron. The research results demonstrate that this algorithm can be an effective approach for measuring the momentum distribution of the injected beam in a synchrotron. Furthermore, this method also has the potential to be extended to reconstruct the transverse phase space of the injected beam.\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":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141114234","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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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

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Table-top ion-trap experiment on the stability of intense short bunches in linear hadron accelerators 关于直线强子加速器中强短束稳定性的台式离子阱实验

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.27.054201

M. Kuroda, A. Kasagaki, H. Okamoto, K. Ito

{"title":"Table-top ion-trap experiment on the stability of intense short bunches in linear hadron accelerators","authors":"M. Kuroda, A. Kasagaki, H. Okamoto, K. Ito","doi":"10.1103/physrevaccelbeams.27.054201","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.054201","url":null,"abstract":"The novel experimental system “S-POD” (Simulator of Particle Orbit Dynamics) is employed to explore the stability of short hadron bunches in high-intensity linacs. In a previous study with the S-POD [M. Goto et al., ], a static potential was used to focus the bunch in the longitudinal direction. We here make a step forward to include the possibility of pure synchrotron resonance, introducing periodic modulation to the longitudinal potential well. The modulation period was taken a half of the transverse alternating-gradient focusing period, which reflects the most typical lattice condition of a drift-tube linac. Detailed stability maps are constructed to reveal dangerous parameter regions where serious beam loss may occur due to resonance. We reconfirm the existence of various betatron and synchrobetatron resonance stop bands whose widths and locations change in tune space depending on the bunch intensity. It turns out that the periodicity of the longitudinal focusing potential brings about no pronounced effect on the resonance feature; the result is very similar to what we obtained in the previous study with a static longitudinal potential. As long as the lattice periodicity mentioned above is maintained, no serious noncoupling synchrotron resonance appears even with a high synchrotron phase advance above 90° per unit alternating-gradient cell. Severe envelope instability may, however, be excited in the longitudinal direction if the axial focusing force includes error components that affect the original lattice periodicity. The experimental observations can be explained with the free from the concept of incoherent tune spread.\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":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141117664","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

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

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Longitudinal ion-clearing mechanism in space-charge neutralization of low energy beams 低能束空间电荷中和中的纵向离子清除机制

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.27.050101

C. A. Valerio-Lizarraga

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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

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Metal additive manufacturing for particle accelerator applications 用于粒子加速器的金属快速成型技术

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-17 DOI: 10.1103/physrevaccelbeams.27.054801

Tobia Romano, Guntis Pikurs, Andris Ratkus, Toms Torims, Nicolas Delerue, Maurizio Vretenar, Lukas Stepien, Elena López, Maurizio Vedani

{"title":"Metal additive manufacturing for particle accelerator applications","authors":"Tobia Romano, Guntis Pikurs, Andris Ratkus, Toms Torims, Nicolas Delerue, Maurizio Vretenar, Lukas Stepien, Elena López, Maurizio Vedani","doi":"10.1103/physrevaccelbeams.27.054801","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.054801","url":null,"abstract":"Metal additive manufacturing technologies are rapidly becoming an integral part of the advanced technological portfolio for the most demanding industrial applications. These processes are capable of fabricating three-dimensional components with near-net shape quality by depositing the constituent materials in a layer-by-layer fashion. This fabrication approach provides numerous advantages over conventional manufacturing methods, including enhanced design flexibility, reduced production costs and lead times, rapid prototyping, and the possibility to repair damaged parts. In recent years, the growing demand for novel accelerator components with improved performance characteristics, integrating structures such as drift tubes and internal cooling channels, has prompted the exploration of additive manufacturing in the field of particle accelerators. Radio-frequency components, beam intercepting devices, and vacuum systems have been prototyped using various metallic materials and additive manufacturing technologies, demonstrating performance levels comparable to the conventionally manufactured counterparts in preliminary tests. However, the absence of established qualification protocols and the uncertain reliability of additively manufactured parts under the demanding conditions typical of accelerator applications pose significant challenges to the integration of additive manufacturing processes into the fabrication practices of these components. This paper provides a comprehensive review of documented applications of metal additive manufacturing in particle accelerators, highlighting benefits, challenges, and opportunities for future improvements. The main requirements and currently available test setups for the assessment of additively manufactured components in applications involving ultrahigh vacuum and intense electromagnetic fields are also discussed.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063360","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

Thermal and electric field driven rf breakdown precursor formation on metal surfaces 金属表面的热和电场驱动射频击穿前驱体形成

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-17 DOI: 10.1103/physrevaccelbeams.27.053101

Ryo Shinohara, Soumendu Bagchi, Evgenya Simakov, S. Baryshev, Danny Perez

{"title":"Thermal and electric field driven rf breakdown precursor formation on metal surfaces","authors":"Ryo Shinohara, Soumendu Bagchi, Evgenya Simakov, S. Baryshev, Danny Perez","doi":"10.1103/physrevaccelbeams.27.053101","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.053101","url":null,"abstract":"The phenomenon of electric breakdown poses serious challenges to the design of devices that operate in high electric field environments. Experimental evidence points toward breakdown events that are accompanied by elevated temperatures and dark current spikes, which is attributed to high-asperity nanostructure formation that enhances the local electric field and triggers a runaway process. However, the exact mechanistic origin of such nanostructures under typical macroscopic operational conditions of electric field and magnetic-field-mediated heating remains poorly understood. In this work, we simulate the evolution of a copper surface under the combined action of the electric fields and elevated temperatures. Using a mesoscale curvature-driven surface evolution model, we show how a copper surface can undergo a type of dynamical instability that naturally leads to the formation of sharp asperities in realistic experimental conditions. Exploring the combined effect of fields and temperature rise, we identify the critical regimes that allow for the formation of breakdown precursors. The results show that thermoelastic stresses, while not essential, can significantly lower the critical electric field required for runaway surface instability, which is consistent with experimental observations that thermal effects can increase breakdown rates.\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":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140962657","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