Physical Review Accelerators and Beams最新文献_第8页

Laser-driven pointed acceleration of electrons with preformed plasma lens 利用预制等离子体透镜进行激光驱动的电子尖点加速

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.27.051301

K. A. Ivanov, D. A. Gorlova, I. N. Tsymbalov, I. P. Tsygvintsev, S. A. Shulyapov, R. V. Volkov, A. B. Savel’ev

{"title":"Laser-driven pointed acceleration of electrons with preformed plasma lens","authors":"K. A. Ivanov, D. A. Gorlova, I. N. Tsymbalov, I. P. Tsygvintsev, S. A. Shulyapov, R. V. Volkov, A. B. Savel’ev","doi":"10.1103/physrevaccelbeams.27.051301","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.051301","url":null,"abstract":"The simultaneous laser-driven acceleration and angular manipulation of the fast electron beam are experimentally demonstrated. The bunch of multi-MeV energy charged particles is generated during the propagation of the femtosecond laser pulse through the near-critical plasma slab accompanied by plasma channeling. Plasma is formed by the controlled breakdown of a thin-tape target by a powerful nanosecond prepulse. The electron beam pointing approach is based on the refraction of a laser pulse in the presence of a strong radial density gradient in the breakdown of the tape with a small displacement of the femtosecond laser beam relative to the breakdown symmetry axis. A shift of several micrometers makes it possible to achieve beam deflection by an angle up to 10° with acceptable beam charge and spectrum conservation. This opens up opportunities for <i>in situ</i> applications for scanning objects with an electron beam and the multistage electron beam energy gain in consecutive laser accelerators without bulk magnetic optics for particles. Experimental findings are supported by numerical particle-in-cell calculations of laser-plasma acceleration and hydrodynamic simulations.","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":"141063281","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

Crystal-based absolute photon energy calibration methods for hard x-ray free-electron lasers 基于晶体的硬 X 射线自由电子激光器绝对光子能量校准方法

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-16 DOI: 10.1103/physrevaccelbeams.27.050701

Christian Grech, Marc Walter Guetg, Gianluca Aldo Geloni, Ulrike Boesenberg, Naresh Kujala, Mikako Makita, Svitozar Serkez

引用次数: 1

Experimental demonstration of radius-varying active plasma lensing for laser-plasma-accelerated proton beams with increased collection angle 用于激光等离子体加速质子束的半径可变主动等离子体透镜的实验演示，收集角增大

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-13 DOI: 10.1103/physrevaccelbeams.27.052802

Yang Yan, Tong Yang, Zhen Guo, Mingfeng Huang, Hao Cheng, Yuze Li, Yanlv Fang, Chentong Li, Yadong Xia, Qiangyou He, Yiting Yan, Chen Lin, Xueqing Yan

{"title":"Experimental demonstration of radius-varying active plasma lensing for laser-plasma-accelerated proton beams with increased collection angle","authors":"Yang Yan, Tong Yang, Zhen Guo, Mingfeng Huang, Hao Cheng, Yuze Li, Yanlv Fang, Chentong Li, Yadong Xia, Qiangyou He, Yiting Yan, Chen Lin, Xueqing Yan","doi":"10.1103/physrevaccelbeams.27.052802","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.052802","url":null,"abstract":"Active plasma lensing, a compact method for intensifying the focus of charged particle beams by providing a magnetic field gradient of kT/m, has emerged as a sought-after technology in laser plasma accelerator applications. However, the utilization of active plasma lenses faces significant hurdles when dealing with laser-driven proton pulses, characterized by their broad bandwidth and high divergence. To address this challenge, we developed a novel active plasma lens with a variable radius, specifically designed to optimize lens geometry in accordance with the beam envelope, and performed the first measurement of its focusing ability. The experimental findings reveal that, compared to conventional cylindrical active plasma lenses, our radius-varying lens exhibits a 2.0-fold improvement in single-energy transmission efficiency, while maintaining comparable achromatic ability. This breakthrough is anticipated to significantly contribute to the miniaturization of laser proton accelerators.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939524","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

Vacuum chambers for Swiss Light Source arcs 用于瑞士光源电弧的真空室

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-10 DOI: 10.1103/physrevaccelbeams.27.053201

R. Ganter, P. Braschoss, H.-H. Braun, J. Buchmann, A. Citterio, M. Dehler, N. Gaiffi, N. Kirchgeorg, M. Magjar, C. Rosenberg, D. Stephan, L. Schulz, R. Sieber, X. Wang, A. Zandonella

{"title":"Vacuum chambers for Swiss Light Source arcs","authors":"R. Ganter, P. Braschoss, H.-H. Braun, J. Buchmann, A. Citterio, M. Dehler, N. Gaiffi, N. Kirchgeorg, M. Magjar, C. Rosenberg, D. Stephan, L. Schulz, R. Sieber, X. Wang, A. Zandonella","doi":"10.1103/physrevaccelbeams.27.053201","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.053201","url":null,"abstract":"The vacuum chambers for diffraction limited storage ring differ from the previous storage rings generation in three main aspects: the cross-section dimension, which is divided by a factor of 2 or more to fit smaller magnet apertures; the material, which includes much more copper for heat dissipation and to limit resistive wakefields; the coating of the inner surface with a nonevaporable getter (NEG) to ensure good pumping level despite low conductance. This paper gives a detailed description of the vacuum chambers’ design used in the arc section of SLS 2.0, starting with conceptual design choices based among others on synchrotron radiation heat and wakefield considerations. The particular case of the main bending magnet vacuum chamber is explained in detail from design to manufacturing, including the development of an appropriate NEG coating procedure. Finally, the overall assembly of a 17 m long arc, its activation to reach pressure in the <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mrow><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>11</mn></mrow></msup></mrow><mtext> </mtext><mtext> </mtext><mi>mbar</mi></mrow></math> range followed by transport and installation into the magnets is presented. This validates the choice of <i>ex situ</i> activation for an arc vessel made out of copper, with wall thicknesses as small as 1 mm and with less than 0.5 mm clearance to magnet poles.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939567","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

Conceptual design of a high reactive-power ferroelectric fast reactive tuner 高反应功率铁电快速反应调谐器的概念设计

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-10 DOI: 10.1103/physrevaccelbeams.27.052001

Ilan Ben-Zvi, Graeme Burt, Alejandro Castilla, Alick Macpherson, Nicholas Shipman

{"title":"Conceptual design of a high reactive-power ferroelectric fast reactive tuner","authors":"Ilan Ben-Zvi, Graeme Burt, Alejandro Castilla, Alick Macpherson, Nicholas Shipman","doi":"10.1103/physrevaccelbeams.27.052001","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.052001","url":null,"abstract":"We present a novel design of a ferroelectric fast reactive tuner (FE-FRT) capable of modulating mega-VAR reactive power on a submicrosecond timescale. The high reactive power capability of our design extends the range of applications of reactive tuners to numerous applications. We present a detailed analytical model of the performance of a megawatt-class reactive power device and benchmark it against finite-element method eigenmode and frequency domain electromagnetic simulations. We introduce new features, including an annulus design for the ferroelectric capacitors and capacitive window coupling to the cavity. We consider thermal design issues and nonlinear effects in the ferroelectric. The model covers several configurations, allowing control of the frequency of superconducting and normal-conducting cavities in a variety of applications and frequencies. We calculate that the FE-FRT designed should be capable of handling around 0.45 MVAR of reactive power with around 3 kW of resistive losses, providing a frequency tuning range of 8 kHz in an example of 400 MHz cavity geometry.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939466","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, integration, and commissioning of the first linac for image guided hadron therapy prototype 设计、集成和调试第一台用于图像引导强子治疗原型的直线加速器

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-09 DOI: 10.1103/physrevaccelbeams.27.054701

Alberto Degiovanniet al.

引用次数: 0

Feasibility of a strong focusing synchrotron for cold neutron beams 冷中子束强聚焦同步加速器的可行性

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-08 DOI: 10.1103/physrevaccelbeams.27.054001

S. Y. Lee, L. K. Nguyen

引用次数: 0

Transverse emittance growth due to rf noise in crab cavities: Theory, measurements, cure, and high luminosity LHC estimates 蟹腔中的射频噪声导致的横向幅射增长：理论、测量、治疗和高亮度大型强子对撞机估计值

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-06 DOI: 10.1103/physrevaccelbeams.27.051001

P. Baudrenghien, T. Mastoridis

{"title":"Transverse emittance growth due to rf noise in crab cavities: Theory, measurements, cure, and high luminosity LHC estimates","authors":"P. Baudrenghien, T. Mastoridis","doi":"10.1103/physrevaccelbeams.27.051001","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.051001","url":null,"abstract":"The High-Luminosity LHC (HL-LHC) upgrade with planned operation from 2029 onward has a goal of achieving a tenfold increase in the integrated number of recorded collisions thanks to a doubling of the intensity per bunch (<math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2.2</mn><mo>×</mo><msup><mn>10</mn><mn>11</mn></msup></math> protons) and a reduction of <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>β</mi><mo>*</mo></msup></math> (the <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math> value in the two high luminosity detectors, namely ATLAS and CMS) to 15 cm. Such an increase in recorded collisions would significantly expedite new discoveries and exploration. Crab cavities are an important component of the HL-LHC upgrade and will contribute strongly to achieving an increase in the number of recorded collisions. However, noise injected through the crab cavity radio frequency (rf) system could cause significant transverse emittance growth and limit luminosity lifetime. We presented a theoretical formalism relating transverse emittance growth to rf noise in an earlier work. In this follow-up paper, we summarize measurements in the super-proton synchrotron (SPS) at CERN that validate the theory, we present estimates of the emittance growth rates using state-of-the-art rf and low-level rf (LLRF) technologies, and we set the rf noise specifications to achieve acceptable performance. A novel dedicated feedback system acting through the crab cavities to mitigate emittance growth will be required. In this work, we develop a theoretical formalism to evaluate the performance of such a feedback system in any collider, identify limiting components, present simulation results to validate these studies, and derive key design parameters for an HL-LHC implementation of such a feedback system.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882880","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

High transmission efficiency collection system for laser-accelerated proton beams based on permanent magnet quadrupoles prefocusing 基于永磁四极预聚焦的激光加速质子束高传输效率收集系统

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-05-03 DOI: 10.1103/physrevaccelbeams.27.052801

Yang Yan, Hao Cheng, Yuze Li, Yanlv Fang, Yadong Xia, Qiangyou He, Chentong Li, Fangnan Li, Zhen Guo, Yiting Yan, Mingfeng Huang, Minjian Wu, Kedong Wang, Kun Zhu, Xueqing Yan, Chen Lin

{"title":"High transmission efficiency collection system for laser-accelerated proton beams based on permanent magnet quadrupoles prefocusing","authors":"Yang Yan, Hao Cheng, Yuze Li, Yanlv Fang, Yadong Xia, Qiangyou He, Chentong Li, Fangnan Li, Zhen Guo, Yiting Yan, Mingfeng Huang, Minjian Wu, Kedong Wang, Kun Zhu, Xueqing Yan, Chen Lin","doi":"10.1103/physrevaccelbeams.27.052801","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.052801","url":null,"abstract":"A new high transmission efficiency, easily tunable, and cost-effective beam collection system is proposed for laser-accelerated proton beams with large divergence angles and wide energy spectra. In previous experiments conducted at the compact laser plasma accelerator platform of Peking University, a beamline was initially constructed with a collection system based on an electromagnetic quadrupoles (EMQs) triplet. However, due to the limited acceptance angle, the EMQs exhibited a monoenergetic transmission efficiency of only 10% to 20% for laser accelerated proton beams. Permanent magnet quadrupoles (PMQs), known for their high magnetic field gradients, compact size, and lower expenses, are well suited for integration with other readily adjustable transmission elements like EMQs and solenoids, effectively enhancing the beam collection capabilities of the system. In this paper, we show that by introducing a pair of centimeter-sized PMQs in front of the EMQs for beam prefocusing, the beam’s transverse size is quickly compressed, enabling transmission of highly divergent protons. Experimental results demonstrate that the prefocusing by PMQs increased the system’s transmission efficiency by a factor of 2.44 to 6.01 compared to the original setup, while also enhancing the energy selection based on stronger chromatic effect. This method can be extended to 100 MeV high-energy proton beamlines and is crucial for applications of laser plasma accelerators.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140826960","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

Evolution of density-modulated electron beams in drift sections 密度调制电子束在漂移段中的演变

IF 1.7 3区物理与天体物理

Physical Review Accelerators and Beams Pub Date : 2024-04-26 DOI: 10.1103/physrevaccelbeams.27.040702

Shaukat Khan, Giovanni Perosa, Filippo Sottocorona, Alexander Brynes, Giovanni De Ninno, Giuseppe Penco, Primož Rebernic Ribič, Simone Spampinati, Carlo Spezzani, Mauro Trovò, Luca Giannessi, Enrico Allaria, Evgeny Schneidmiller, Eugenio Ferrari

{"title":"Evolution of density-modulated electron beams in drift sections","authors":"Shaukat Khan, Giovanni Perosa, Filippo Sottocorona, Alexander Brynes, Giovanni De Ninno, Giuseppe Penco, Primož Rebernic Ribič, Simone Spampinati, Carlo Spezzani, Mauro Trovò, Luca Giannessi, Enrico Allaria, Evgeny Schneidmiller, Eugenio Ferrari","doi":"10.1103/physrevaccelbeams.27.040702","DOIUrl":"https://doi.org/10.1103/physrevaccelbeams.27.040702","url":null,"abstract":"Initiating the amplification process in a short-wavelength free-electron laser (FEL) by external seed laser pulses results in radiation with a high degree of longitudinal and transverse coherence. The basic layout in seeded harmonic generation involves a periodic electron energy modulation by laser-electron interaction in a short undulator (the “modulator”), which is converted into a density modulation in a dispersive section immediately followed by a long FEL undulator (the “radiator”) tuned to a harmonic of the seed laser wavelength. With the advent of more complex seeding schemes, density-modulated beams may need to be transported in drift sections before entering the radiator. Long FEL undulators may also contain several drift spaces to accommodate focusing elements and diagnostics. Therefore, it is of general interest to study the evolution of density-modulated electron beams in drift sections under the influence of repulsive Coulomb forces. At FERMI, a seeded FEL user facility in Trieste, Italy, systematic studies of the impact of varying drift length on coherent harmonic emission were undertaken. In order to make the underlying physics transparent, the emphasis of this paper is on reproducing the experimental findings with analytical estimates and a simple one-dimensional numerical model. Furthermore, the Coulomb forces in a drift section may be employed to enhance the laser-induced energy modulation and yield an improved density modulation before entering the FEL radiator.","PeriodicalId":54297,"journal":{"name":"Physical Review Accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140805703","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