发布求助
文献互助 智能选刊 最新文献

arXiv: Accelerator Physics最新文献

筛选
英文 中文
Study of ultra-high gradient acceleration in carbon nanotube arrays. 碳纳米管阵列超高梯度加速度研究。
arXiv: Accelerator Physics Pub Date : 2018-05-01 DOI: 10.18429/JACoW-IPAC2018-TUXGBE2
J. Resta-López, Alexandra Alexandrova, Y. Li, V. Rodin, Y. Wei, Carsten Welsch, Guoxing Xia, Yuan Zhao
{"title":"Study of ultra-high gradient acceleration in carbon nanotube arrays.","authors":"J. Resta-López, Alexandra Alexandrova, Y. Li, V. Rodin, Y. Wei, Carsten Welsch, Guoxing Xia, Yuan Zhao","doi":"10.18429/JACoW-IPAC2018-TUXGBE2","DOIUrl":"https://doi.org/10.18429/JACoW-IPAC2018-TUXGBE2","url":null,"abstract":"Solid-state based wakefield acceleration of charged particles was previously proposed to obtain extremely high gradients on the order of 1-10 TeV/m. In recent years the possibility of using either metallic or carbon nanotube structures is attracting new attention. The use of carbon nanotubes would allow us to accelerate and channel particles overcoming many of the limitations of using natural crystals, e.g. channeling aperture restrictions and thermal-mechanical robustness issues. In this paper, we propose a potential proof of concept experiment using carbon nanotube arrays, assuming the beam parameters and conditions of accelerator facilities already available, such as CLEAR at CERN and CLARA at Daresbury. The acceleration performance of carbon nanotube arrays is investigated by using a 2D Particle-In-Cell (PIC) model based on a multi-hollow plasma. Optimum experimental beam parameters and system layout are discussed.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86469942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Accelerators for Medical Applications - Radio Frequency Powering 医疗用加速器。射频供电
arXiv: Accelerator Physics Pub Date : 2018-04-23 DOI: 10.23730/CYRSP-2017-001.119
E. Montesinos
{"title":"Accelerators for Medical Applications - Radio Frequency Powering","authors":"E. Montesinos","doi":"10.23730/CYRSP-2017-001.119","DOIUrl":"https://doi.org/10.23730/CYRSP-2017-001.119","url":null,"abstract":"This paper reviews the main types of radio-frequency powering systems which may be used for medical applications. It gives the essentials on vacuum tubes, including tetrodes, klystrons, and inductive output tubes, and the essentials on transistors. The basics of combining systems, splitting systems, and transmission lines are discussed. The paper concludes with a case study specific to medical applications, including overall efficiency and cost analysis regarding the various available technologies.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80379194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Resonant and random excitations on the proton beam in the Large Hadron Collider for active halo control with pulsed hollow electron lenses 大型强子对撞机中质子束的共振和随机激励，用于脉冲空心电子透镜主动晕控制
arXiv: Accelerator Physics Pub Date : 2018-04-20 DOI: 10.1103/PHYSREVACCELBEAMS.24.021001
M. Fitterer, G. Stancari, A. Valishev, S. Redaelli, D. Valuch
{"title":"Resonant and random excitations on the proton beam in the Large Hadron Collider for active halo control with pulsed hollow electron lenses","authors":"M. Fitterer, G. Stancari, A. Valishev, S. Redaelli, D. Valuch","doi":"10.1103/PHYSREVACCELBEAMS.24.021001","DOIUrl":"https://doi.org/10.1103/PHYSREVACCELBEAMS.24.021001","url":null,"abstract":"We present the results of numerical simulations and experimental studies about the effects of resonant and random excitations on proton losses, emittances, and beam distributions in the Large Hadron Collider (LHC). In addition to shedding light on complex nonlinear effects, these studies are applied to the design of hollow electron lenses (HEL) for active beam halo control. In the High-Luminosity Large Hadron Collider (HL-LHC), a considerable amount of energy will be stored in the beam tails. To control and clean the beam halo, the installation of two hollow electron lenses, one per beam, is being considered. In standard electron-lens operation, a proton bunch sees the same electron current at every revolution. Pulsed electron beam operation (i.e., different currents for different turns) is also considered, because it can widen the range of achievable halo removal rates. For an axially symmetric electron beam, only protons in the halo are excited. If a residual field is present at the location of the beam core, these particles are exposed to time-dependent transverse kicks and to noise. We discuss the numerical simulations and the experiments conducted in 2016 and 2017 at injection energy in the LHC. The excitation patterns were generated by the transverse feedback and damping system, which acted as a flexible source of dipole kicks. Proton beam losses, emittances, and transverse distributions were recorded as a function of excitation patterns and strengths. The resonant excitations induced rich dynamical effects and nontrivial changes of the beam distributions, which, to our knowledge, have not previously been observed and studied in this detail. We conclude with a discussion of the tolerable and achievable residual fields and proposals for further studies.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77299757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Evaluation of Beam Halo from Beam-Gas Scattering at the KEK-ATF KEK-ATF中光束-气体散射对光束晕的评价
arXiv: Accelerator Physics Pub Date : 2018-03-22 DOI: 10.1103/PhysRevAccelBeams.21.051001
R. Yang, T. Naito, S. Bai, A. Aryshev, K. Kubo, T. Okugi, N. Terunuma, D. Zhou, A. Faus-Golfe, V. Kubytskyi, S. Liu, S. Wallon
{"title":"Evaluation of Beam Halo from Beam-Gas Scattering at the KEK-ATF","authors":"R. Yang, T. Naito, S. Bai, A. Aryshev, K. Kubo, T. Okugi, N. Terunuma, D. Zhou, A. Faus-Golfe, V. Kubytskyi, S. Liu, S. Wallon","doi":"10.1103/PhysRevAccelBeams.21.051001","DOIUrl":"https://doi.org/10.1103/PhysRevAccelBeams.21.051001","url":null,"abstract":"In circular colliders, as well as in damping rings and synchrotron radiation light sources, beam halo is one of the critical issues limiting the performance as well as potentially causing component damage and activation. It is imperative to clearly understand the mechanisms that lead to halo formation and to test the available theoretical models. Elastic beam-gas scattering can drive particles to large oscillation amplitudes and be a potential source of beam halo. In this paper, numerical estimation and Monte Carlo simulations of this process at the ATF of KEK are presented. Experimental measurements of beam halo in the ATF2 beam line using a diamond sensor detector are also described, which clearly demonstrates the influence of the beam-gas scattering process on the transverse halo distribution.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84138508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
First muon acceleration using a radio frequency accelerator 首次使用射频加速器加速μ子
arXiv: Accelerator Physics Pub Date : 2018-03-21 DOI: 10.1103/PhysRevAccelBeams.21.050101
S. Bae, H. Choi, Sang Il Choi, Y. Fukao, K. Futatsukawa, K. Hasegawa, T. Iijima, H. Iinuma, K. Ishida, N. Kawamura, B. Kim, R. Kitamura, H. Ko, Y. Kondo, S. Li, T. Mibe, Y. Miyake, T. Morishita, Y. Nakazawa, M. Otani, G. Razuvaev, G. Razuvaev, N. Saito, K. Shimomura, Y. Sue, E. Won, T. Yamazaki
{"title":"First muon acceleration using a radio frequency accelerator","authors":"S. Bae, H. Choi, Sang Il Choi, Y. Fukao, K. Futatsukawa, K. Hasegawa, T. Iijima, H. Iinuma, K. Ishida, N. Kawamura, B. Kim, R. Kitamura, H. Ko, Y. Kondo, S. Li, T. Mibe, Y. Miyake, T. Morishita, Y. Nakazawa, M. Otani, G. Razuvaev, G. Razuvaev, N. Saito, K. Shimomura, Y. Sue, E. Won, T. Yamazaki","doi":"10.1103/PhysRevAccelBeams.21.050101","DOIUrl":"https://doi.org/10.1103/PhysRevAccelBeams.21.050101","url":null,"abstract":"Muons have been accelerated by using a radio frequency accelerator for the first time. Negative muonium atoms (Mu$^-$), which are bound states of positive muons ($mu^+$) and two electrons, are generated from $mu^+$'s through the electron capture process in an aluminum degrader. The generated Mu$^-$'s are initially electrostatically accelerated and injected into a radio frequency quadrupole linac (RFQ). In the RFQ, the Mu$^-$'s are accelerated to 89 keV. The accelerated Mu$^-$'s are identified by momentum measurement and time of flight. This compact muon linac opens the door to various muon accelerator applications including particle physics measurements and the construction of a transmission muon microscope.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85497483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Non-evaporable getter coating chambers for extreme high vacuum 用于极高真空的不可蒸发吸气涂层室
arXiv: Accelerator Physics Pub Date : 2018-03-19 DOI: 10.1116/1.5010154
M. Stutzman, P. Adderley, M. Mamun, M. Poelker
{"title":"Non-evaporable getter coating chambers for extreme high vacuum","authors":"M. Stutzman, P. Adderley, M. Mamun, M. Poelker","doi":"10.1116/1.5010154","DOIUrl":"https://doi.org/10.1116/1.5010154","url":null,"abstract":"Techniques for NEG coating a large diameter chamber are presented along with vacuum measurements in the chamber using several pumping configurations, with base pressure as low as 1.56x10^-12 Torr (N2 equivalent) with only a NEG coating and small ion pump. We then describe modifications to the NEG coating process to coat complex geometry chambers for ultra-cold atom trap experiments. Surface analysis of NEG coated samples are used to measure composition and morphology of the thin films. Finally, pressure measurements are compared for two NEG coated polarized electron source chambers: the 130 kV polarized electron source at Jefferson Lab and the upgraded 350 kV polarized 2 electron source, both of which are approaching or within the extreme high vacuum (XHV) range, defined as P<7.5x10^-13 Torr.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85299228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Analytical Impedance Models for Very Short Bunches 甚短束的解析阻抗模型
arXiv: Accelerator Physics Pub Date : 2018-03-19 DOI: 10.23732/CYRCP-2018-001.133
I. Zagorodnov
{"title":"Analytical Impedance Models for Very Short Bunches","authors":"I. Zagorodnov","doi":"10.23732/CYRCP-2018-001.133","DOIUrl":"https://doi.org/10.23732/CYRCP-2018-001.133","url":null,"abstract":"We discuss several analytical models for impedances of very short bunches. The approximate analytical models are compared with direct solution of Maxwells equations.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76289498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Imaging nanoscale spatial modulation of a relativistic electron beam with a MeV ultrafast electron microscope 用MeV超快电子显微镜成像相对论电子束的纳米尺度空间调制
arXiv: Accelerator Physics Pub Date : 2018-03-12 DOI: 10.1063/1.5023179
Chao Lu, Tao Jiang, Shengguang Liu, Rui Wang, Lingrong Zhao, P. Zhu, Yaqi Liu, Jun Xu, D. Yu, W. Wan, Yimei Zhu, D. Xiang, Jie Zhang
{"title":"Imaging nanoscale spatial modulation of a relativistic electron beam with a MeV ultrafast electron microscope","authors":"Chao Lu, Tao Jiang, Shengguang Liu, Rui Wang, Lingrong Zhao, P. Zhu, Yaqi Liu, Jun Xu, D. Yu, W. Wan, Yimei Zhu, D. Xiang, Jie Zhang","doi":"10.1063/1.5023179","DOIUrl":"https://doi.org/10.1063/1.5023179","url":null,"abstract":"Accelerator-based MeV ultrafast electron microscope (MUEM) has been proposed as a promising tool to study structural dynamics at the nanometer spatial scale and picosecond temporal scale. Here we report experimental tests of a prototype MUEM where high quality images with nanoscale fine structures were recorded with a pulsed 3 MeV picosecond electron beam. The temporal and spatial resolution of the MUEM operating in single-shot mode is about 4 ps (FWHM) and 100 nm (FWHM), corresponding to a temporal-spatial resolution of 4e-19 s*m, about 2 orders of magnitude higher than that achieved with state-of-the-art single-shot keV UEM. Using this instrument we offer the demonstration of visualizing the nanoscale periodic spatial modulation of an electron beam, which may be converted into longitudinal density modulation through emittance exchange to enable production of high-power coherent radiation at short wavelengths. Our results mark a great step towards single-shot nanometer-resolution MUEMs and compact intense x-ray sources that may have wide applications in many areas of science.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86776237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Optics and bremsstrahlung estimates for channeling radiation experiments at FAST FAST通道辐射实验的光学和轫致辐射估计
arXiv: Accelerator Physics Pub Date : 2018-02-16 DOI: 10.2172/1480121
J. Hyun, P. Piot, Tanaji Sen
{"title":"Optics and bremsstrahlung estimates for channeling radiation experiments at FAST","authors":"J. Hyun, P. Piot, Tanaji Sen","doi":"10.2172/1480121","DOIUrl":"https://doi.org/10.2172/1480121","url":null,"abstract":"This paper presents X-ray spectra of channeling radiation (CR) expected at the FAST (Fermi Accelerator Science and Technology) facility in Fermilab. Our purpose is to produce high brightness quasi-monochromatic X-rays in an energy range from 40 keV to 110 keV. We will use a diamond crystal and low emittance electrons with an energy of around 43 MeV. The quality of emitted X-rays strongly depends on parameters of the electron beam at the crystal. We present simulations of the beam optics for high brightness and high yield operations with bunch charges of 1 pC, 20 pC, and 200 pC. We estimate the X-ray spectra including bremsstrahlung background for a charge of 20 pC. The electron beam distributions with and without channeling in the diamond crystal are calculated. We discuss an X-ray detector system to avoid pile-up effect during high charge operations.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76557037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Electron Multi-Beams (Electron Grids, Electron Lattices and Electron Grates): New Elements for Accelerators 电子多束束(电子栅格、电子晶格和电子栅格):加速器的新元件
arXiv: Accelerator Physics Pub Date : 2018-01-26 DOI: 10.2172/1464935
V. Shiltsev
{"title":"Electron Multi-Beams (Electron Grids, Electron Lattices and Electron Grates): New Elements for Accelerators","authors":"V. Shiltsev","doi":"10.2172/1464935","DOIUrl":"https://doi.org/10.2172/1464935","url":null,"abstract":"Since the initial proposal in 1990s, the method of electron lenses has been successfully developed and employed at the high energy particle colliders, like Tevatron and RHIC. Here we propose a new set of electron multi beam elements (electron grids, electron lattices, electron grates and other) which employ many beams in various spatial configurations, with possible time varying currents. We present major principles of operation and generation of such systems and briefly discuss a set of possible applications in accelerators.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76662841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信