Physical Review Accelerators and Beams最新文献

Efficient algorithms for dynamic aperture and momentum acceptance calculation in synchrotron light sources 同步辐射光源动态孔径和动量接受计算的高效算法

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-19 DOI: 10.1103/physrevaccelbeams.27.094002

Bernard Riemann, Masamitsu Aiba, Jonas Kallestrup, Andreas Streun

引用次数: 0

Calculations of space-charge tune shifts in storage rings with extremely short bunches and small bunch spacing 计算极短束和小束间距存储环中的空间电荷调变

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-18 DOI: 10.1103/physrevaccelbeams.27.094201

Zihang Zhao, Na Wang, Haisheng Xu, Zhilong Pan

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Dual-energy electron storage ring 双能量电子储存环

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-18 DOI: 10.1103/physrevaccelbeams.27.090101

B. Dhital, Y. S. Derbenev, A. Hutton, H. Zhang, G. A. Krafft, Y. Zhang, F. Lin, V. S. Morozov

{"title":"Dual-energy electron storage ring","authors":"B. Dhital, Y. S. Derbenev, A. Hutton, H. Zhang, G. A. Krafft, Y. Zhang, F. Lin, V. S. Morozov","doi":"10.1103/physrevaccelbeams.27.090101","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.090101","url":null,"abstract":"A dual-energy electron storage ring is a novel concept initially proposed to cool hadron beams at high energies. The design consists of two closed rings operating at significantly different energies: the low-energy ring and the high-energy ring. These two rings are connected by an energy recovery linac (ERL) that provides the necessary energy difference. The ERL features superconducting radio-frequency (SRF) cavities that first accelerate the beam from the low energy <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>E</mi><mi>L</mi></msub></math> to the high energy <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>E</mi><mi>H</mi></msub></math> and then decelerate the beam from <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>E</mi><mi>H</mi></msub></math> to <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>E</mi><mi>L</mi></msub></math> in the next pass. The different SRF cavities in the ERL section can be adjusted based on the applications. In this paper, we present a possible layout of a dual-energy electron storage ring. The preliminary optics of the ring is designed to optimize chromaticity correction, dynamic aperture, momentum aperture, beam lifetime, radiation damping, and intrabeam scattering effects. The primary focus of this paper is on the stability conditions and beam dynamics studies associated with this storage ring.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142259682","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

Harmonic analysis of nonstationary signals with application to LHC beam measurements 应用于大型强子对撞机光束测量的非稳态信号谐波分析

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-16 DOI: 10.1103/physrevaccelbeams.27.094001

G. Russo, G. Franchetti, M. Giovannozzi, E. H. Maclean

引用次数: 0

Theory of particle beams transport over curved plasma-discharge capillaries 粒子束在弯曲等离子体放电毛细管上的传输理论

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-13 DOI: 10.1103/physrevaccelbeams.27.091301

A. Frazzitta, R. Pompili, A. R. Rossi

{"title":"Theory of particle beams transport over curved plasma-discharge capillaries","authors":"A. Frazzitta, R. Pompili, A. R. Rossi","doi":"10.1103/physrevaccelbeams.27.091301","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.091301","url":null,"abstract":"We present a new approach that demonstrates the deflection and guiding of relativistic electron beams over curved paths by means of the magnetic field generated in a plasma-discharge capillary. The active bending plasma (ABP) represents a promising solution that has been recently demonstrated with a proof of principle experiment. An ABP device consists of a curved capillary where large discharges (of the order of kA) are propagated in a plasma channel. Unlike conventional bending magnets, in which the field is constant over the bending plane, in the ABP, the azimuthal magnetic field generated by the discharge grows with the distance from the capillary axis. This features makes the device less affected by the beam chromatic dispersion so that it can be used to efficiently guide particle beams with non-negligible energy spreads. The study we present in the following aims to provide a theoretical basis of the main ABP features by presenting an analytical description of a single-particle motion and rms beam dynamics. The retrieved relationships are verified by means of numerical simulations and provide the theoretical matrix formalism needed to completely characterize such a new transport device.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177723","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

Coherent-synchrotron-radiation-free longitudinal shaping of a high-charge electron bunch based on velocity modulation 基于速度调制的高电荷电子束无相干同步辐射纵向整形

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-12 DOI: 10.1103/physrevaccelbeams.27.092801

Zhi Song, Shiyu Zhou, Jianfei Hua, Yingchao Du, Fei Li, Bo Peng, Wei Lu, Zhen Wang

{"title":"Coherent-synchrotron-radiation-free longitudinal shaping of a high-charge electron bunch based on velocity modulation","authors":"Zhi Song, Shiyu Zhou, Jianfei Hua, Yingchao Du, Fei Li, Bo Peng, Wei Lu, Zhen Wang","doi":"10.1103/physrevaccelbeams.27.092801","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.092801","url":null,"abstract":"Beam-driven plasma wakefield acceleration (PWFA) is a promising technique to generate high-energy electron bunches for future electron-positron colliders. Longitudinal shaping of high-charge drive beam is highly desired for achieving high-transformer ratio and loading high-charge witness beam. However, the existing shaping schemes either focused on relatively low-charge bunch shaping or accompanied with significant charge-loss rate (typically over 50%). In this paper, a coherent-synchrotron-radiation-free shaping scheme based on velocity modulation is proposed to generate a high-charge beam with a linearly ramped profile. A <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo form=\"prefix\" stretchy=\"false\">></mo><mn>10</mn><mtext> </mtext><mtext> </mtext><mi>kA</mi></mrow></math>-peak-current shaped beam containing <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo form=\"prefix\">></mo><mn>50</mn><mtext> </mtext><mtext> </mtext><mi>nC</mi></math> charge with a low charge-loss rate is demonstrated by a start-to-end simulation, and the tunabilities of the beam charge and the peak current, and the robustness of the proposed shaping scheme are also discussed. When loaded by a 3 nC witness beam, a <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo form=\"prefix\">></mo><mi>GV</mi><mo>/</mo><mi mathvariant=\"normal\">m</mi></math> accelerating electric field with a transformer ratio larger than 4 can be achieved in a uniform plasma for the shaped drive beam, providing the possibility of high-transformer-ratio PWFA for a high-charge beam.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177722","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

Efficient six-dimensional phase space reconstructions from experimental measurements using generative machine learning 利用生成式机器学习从实验测量中高效重建六维相空间

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-11 DOI: 10.1103/physrevaccelbeams.27.094601

Ryan Roussel, Juan Pablo Gonzalez-Aguilera, Eric Wisniewski, Alexander Ody, Wanming Liu, John Power, Young-Kee Kim, Auralee Edelen

{"title":"Efficient six-dimensional phase space reconstructions from experimental measurements using generative machine learning","authors":"Ryan Roussel, Juan Pablo Gonzalez-Aguilera, Eric Wisniewski, Alexander Ody, Wanming Liu, John Power, Young-Kee Kim, Auralee Edelen","doi":"10.1103/physrevaccelbeams.27.094601","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.094601","url":null,"abstract":"Next-generation accelerator concepts, which hinge on the precise shaping of beam distributions, demand equally precise diagnostic methods capable of reconstructing beam distributions within six-dimensional position-momentum spaces. However, the characterization of intricate features within six-dimensional beam distributions using current diagnostic techniques necessitates a substantial number of measurements, using many hours of valuable beam time. Novel phase space reconstruction techniques are needed to reduce the number of measurements required to reconstruct detailed, high-dimensional beam features in order to resolve complex beam phenomena and as a feedback in precision beam shaping applications. In this study, we present a novel approach to reconstructing detailed six-dimensional phase space distributions from experimental measurements using generative machine learning and differentiable beam dynamics simulations. We demonstrate that this approach can be used to resolve six-dimensional phase space distributions from scratch, using basic beam manipulations and as few as 20 two-dimensional measurements of the beam profile. We also demonstrate an application of the reconstruction method in an experimental setting at the Argonne Wakefield Accelerator, where it is able to reconstruct the beam distribution and accurately predict previously unseen measurements <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>75</mn><mo>×</mo></math> faster than previous methods.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177724","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 and test of an X-band constant gradient structure X 波段恒定梯度结构的设计与测试

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-06 DOI: 10.1103/physrevaccelbeams.27.090401

Qiang Gao, Hao Zha, Jiaru Shi, Xiancai Lin, Yingchao Du, Boyuan Feng, Hongyu Li, Heng Deng, Fangjun Hu, Jian Gao, Qingzhu Li, Weihang Gu, Jiayang Liu, Wenhui Huang, Chuanxiang Tang, Huaibi Chen

{"title":"Design and test of an X-band constant gradient structure","authors":"Qiang Gao, Hao Zha, Jiaru Shi, Xiancai Lin, Yingchao Du, Boyuan Feng, Hongyu Li, Heng Deng, Fangjun Hu, Jian Gao, Qingzhu Li, Weihang Gu, Jiayang Liu, Wenhui Huang, Chuanxiang Tang, Huaibi Chen","doi":"10.1103/physrevaccelbeams.27.090401","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.090401","url":null,"abstract":"A light source project named very compact inverse Compton scattering gamma-ray source (VIGAS) is under development at Tsinghua University. VIGAS aims to generate monochromatic high-energy gamma rays by colliding 350-MeV electron beams with 400-nm laser photons within a 12-m beamline. To produce a high-energy electron beam in such a compact space, the system consists of an S-band high-brightness injector and six X-band high-gradient accelerating structures. The goal of the X-band structure is to operate at a high gradient of <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>80</mn><mtext> </mtext><mtext> </mtext><mi>MV</mi><mo>/</mo><mi mathvariant=\"normal\">m</mi></mrow></math>. Therefore, we adopts the constant gradient traveling wave approach, where the iris from the first cell to the end cell is tapered. The structure has 72 cells, including 70 cells and 2 couplers, so we named it XT72. The frequency of XT72 is selected to 11.424 GHz, and the <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>π</mi><mo>/</mo><mn>3</mn></math> mode is adopted. In this paper, we present a comprehensive study covering the detailed design, fabrication, rf tuning, and high-power test results of the first XT72. Additionally, we compare the performance of this structure to that of the previous constant impedance structure. Our results demonstrate that the XT72 is capable of operating at an <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>80</mn><mtext>−</mtext><mrow><mi>MV</mi><mo>/</mo><mi mathvariant=\"normal\">m</mi></mrow></mrow></math> gradient with a lower breakdown rate. This advancement paves the way for the development of VIGAS project and contributes to the wider application of X-band room-temperature high-gradient structures in compact accelerator facilities.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177729","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 feedback in coaxial superconducting radio frequency cavities 同轴超导射频空腔中的热反馈

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-09-03 DOI: 10.1103/physrevaccelbeams.27.092001

Mattias McMullin, Philipp Kolb, Zhongyuan Yao, Robert Laxdal, Tobias Junginger

{"title":"Thermal feedback in coaxial superconducting radio frequency cavities","authors":"Mattias McMullin, Philipp Kolb, Zhongyuan Yao, Robert Laxdal, Tobias Junginger","doi":"10.1103/physrevaccelbeams.27.092001","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.092001","url":null,"abstract":"The surface resistance of superconducting radio frequency (SRF) cavities depends on the strength of the applied rf field. This field dependence is caused by a combination of intrinsic losses and the extrinsic thermal feedback (TFB) effect. To test theories of intrinsic field dependence, the extrinsic part must be compensated for when analyzing experimental data from SRF cavity tests. Performing this compensation requires knowing thermal parameters that describe heat flow in the cavity walls. The relevant thermal parameters have been measured in the case of superfluid helium, below 2.177 K, but no detailed measurements have yet been reported for cooling of niobium surfaces in normal fluid helium baths. Because of this, the impact of TFB on the field dependence at temperatures near 4.2 K is unknown. In the present study, we report measurements of normal fluid helium boiling from niobium surfaces and its dependence on the orientation of the boiling surface and bath temperature. These measurements are used to create a finite-element model of heat transfer in cavities from TRIUMF’s coaxial test program. This tool is then used to compensate for TFB when analyzing a range of datasets from this program. Results are presented showing that TFB has a weak impact for the temperatures of 2.0 and 4.2 K, where SRF cavities are usually operated, but it is an important effect at intermediate temperatures.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177725","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

Erratum: Acceleration of uranium beam to record power of 10.4 kW and observation of new isotopes at Facility for Rare Isotope Beams [Phys. Rev. Accel. beams 27, 060101 (2024)] 勘误：铀束加速到创纪录的10.4千瓦功率以及在稀有同位素束设施观测到新同位素[物理评论-加速束 27, 060101 (2024)]

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-08-29 DOI: 10.1103/physrevaccelbeams.27.089901

P. N. Ostroumovet al.

引用次数: 0