Physical Review Special Topics-accelerators and Beams最新文献_第10页

Response matrices in strongly coupled storage rings with a radio-frequency system constraining the revolution time 具有旋转时间限制的射频系统强耦合存储环中的响应矩阵

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-29 DOI: 10.1103/PHYSREVSTAB.18.054001

V. Ziemann

引用次数: 1

Subradiant spontaneous undulator emission through collective suppression of shot noise 通过集体抑制散粒噪声的次辐射自发波动发射

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-21 DOI: 10.1103/PHYSREVSTAB.18.050703

D. Ratner, E. Hemsing, A. Gover, A. Marinelli, A. Nause

引用次数: 7

Heavy ion linac as a high current proton beam injector 重离子直线加速器作为大电流质子束注入器

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-18 DOI: 10.1103/PHYSREVSTAB.18.050102

W. Barth, A. Adonin, S. Appel, P. Gerhard, M. Heilmann, F. Heymach, R. Hollinger, W. Vinzenz, H. Vormann, S. Yaramyshev

{"title":"Heavy ion linac as a high current proton beam injector","authors":"W. Barth, A. Adonin, S. Appel, P. Gerhard, M. Heilmann, F. Heymach, R. Hollinger, W. Vinzenz, H. Vormann, S. Yaramyshev","doi":"10.1103/PHYSREVSTAB.18.050102","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.050102","url":null,"abstract":"A significant part of the experimental program at Facility for Antiproton and Ion Research (FAIR) is dedicated to pbar physics requiring a high number of cooled pbars per hour. The primary proton beam has to be provided by a 70 MeV proton linac followed by two synchrotrons. The new FAIR proton linac will deliver a pulsed proton beam of up to 35 mA of $36text{ }text{ }ensuremath{mu}mathrm{s}$ duration at a repetition rate of 4 Hz (maximum). The GSI heavy ion linac (UNILAC) is able to deliver world record uranium beam intensities for injection into the synchrotrons, but it is not suitable for FAIR relevant proton beam operation. In an advanced machine investigation program it could be shown that the UNILAC is able to provide for sufficient high intensities of ${mathrm{CH}}_{3}$ beam, cracked (and stripped) in a supersonic nitrogen gas jet into protons and carbon ions. This advanced operational approach will result in up to 3 mA of proton intensity at a maximum beam energy of 20 MeV, $100text{ }text{ }ensuremath{mu}mathrm{s}$ pulse duration and a repetition rate of up to 2.7 Hz delivered to the synchrotron SIS18. Recent linac beam measurements will be presented, showing that the UNILAC is able to serve as a proton FAIR injector for the first time, while the performance is limited to 25% of the FAIR requirements.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89104061","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: 36

Measurements and Analysis of a High-Brightness Electron Beam Collimated in a Magnetic Bunch Compressor 高亮度电子束在磁束压缩机中准直的测量与分析

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-18 DOI: 10.1103/PHYSREVSTAB.18.050702

F. Zhou, K. Bane, Yuantao Ding, Zhirong Huang, H. Loos, T. Raubenheimer

{"title":"Measurements and Analysis of a High-Brightness Electron Beam Collimated in a Magnetic Bunch Compressor","authors":"F. Zhou, K. Bane, Yuantao Ding, Zhirong Huang, H. Loos, T. Raubenheimer","doi":"10.1103/PHYSREVSTAB.18.050702","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.050702","url":null,"abstract":"A collimator located in a magnetic bunch compressor of a linear accelerator driven x-ray free electron laser has many potential applications, such as the removal of horns in the current distribution, the generation of ultrashort beams, and as a diagnostic of the beam slice emittance. Collective effects, however, are a major concern in applying the technique. Systematic measurements of emittance and analysis were performed using a collimator in the first bunch compressor of the Linac Coherent Light Source (LCLS). In the nominal, undercompressed configuration using the collimator we find that the y emittance (nonbending plane) is not increased, and the x emittance (in the bending plane) is increased by about 25%, in comparison to the injector emittance. From the analysis we conclude that the parasitic effects associated with this method are dominated by coherent synchrotron radiation (CSR), which causes a “systematic error” for measuring slice emittance at the bending plane using the collimation method. In general, we find good agreement between the measurements and simulations including CSR. However, for overcompressed beams at smaller collimator gaps, an extra emittance increase is found that does not agree with 1D simulations and is not understood.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79096081","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: 15

Detailed investigation of the low energy secondary electron yield of technical Cu and its relevance for the LHC 技术Cu低能二次电子产率的详细研究及其对大型强子对撞机的意义

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-18 DOI: 10.1103/PHYSREVSTAB.18.051002

R. Cimino, L. A. González, G. Iadarola, R. Larciprete, A. Romano, G. Rumolo

引用次数: 42

Physics design of a 10 MeV injector test stand for an accelerator-driven subcritical system 加速器驱动亚临界系统10 MeV喷油器试验台物理设计

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-15 DOI: 10.1103/PHYSREVSTAB.18.054201

Fang Yan, S. Pei, H. Geng, C. Meng, Yaliang Zhao, Biao Sun, P. Cheng, Zheng Yang, H. Ouyang, Zhihui Li, Jingyu Tang, Jianli Wang, Y. Sui, J. Dai, P. Sha, R. Ge

{"title":"Physics design of a 10 MeV injector test stand for an accelerator-driven subcritical system","authors":"Fang Yan, S. Pei, H. Geng, C. Meng, Yaliang Zhao, Biao Sun, P. Cheng, Zheng Yang, H. Ouyang, Zhihui Li, Jingyu Tang, Jianli Wang, Y. Sui, J. Dai, P. Sha, R. Ge","doi":"10.1103/PHYSREVSTAB.18.054201","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.054201","url":null,"abstract":"The 10 MeV accelerator-driven subcritical system (ADS) Injector I test stand at Institute of High Energy Physics (IHEP) is a testing facility dedicated to demonstrate one of the two injector design schemes [Injector Scheme-I, which works at 325 MHz], for the ADS project in China. The injector is composed of two parts, the linac part and the beam dump line. The former is designed on the basis of 325 MHz four-vane type copper structure radio frequency quadrupole and superconducting (SC) spoke cavities with beta = 0.12. The latter is designed to transport the beamcoming out of the SC section of the linac to the beam dump, where the beam transverse profile is fairly enlarged and unformed to simplify the beam target design. The SC section consists of two cryomodules with 14 beta = 0.12 Spoke cavities, 14 solenoid and 14 BPMs in total. The first challenge in the physics design comes from the necessary space required for the cryomodule separation where the periodical lattice is destroyed at a relatively lower energy of similar to 5 MeV. Another challenge is the beam dump line design, as it will be the first beam dump line being built by using a step field magnet for the transverse beam expansion and uniformity in the world. This paper gives an overview of the physics design study together with the design principles and machine construction considerations. The results of an optimized design, fabrication status and end to end simulations including machine errors are presented.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80806985","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: 7

Transverse space-charge induced microbunching instability in high-brightness electron bunches 高亮度电子束中横向空间电荷诱导的微束不稳定性

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-11 DOI: 10.1103/PHYSREVSTAB.18.054401

M. Venturini, J. Qiang

引用次数: 5

Conical diffraction effect in optical and x-ray Smith-Purcell radiation 光学和x射线史密斯-珀塞尔辐射中的锥形衍射效应

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-08 DOI: 10.1103/PHYSREVSTAB.18.052801

D. Sergeeva, A. Tishchenko, M. Strikhanov

{"title":"Conical diffraction effect in optical and x-ray Smith-Purcell radiation","authors":"D. Sergeeva, A. Tishchenko, M. Strikhanov","doi":"10.1103/PHYSREVSTAB.18.052801","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.052801","url":null,"abstract":"Smith-Purcell radiation is a well-known phenomenon, which provides a noninvasive scheme for diagnostics of charged particle beams and is used as an effective source of electromagnetic waves, e.g., in the orotron, the free electron laser, etc. In this paper we develop the theory of Smith-Purcell radiation (SPR) for the little-investigated case of arbitrary angles between the charged particle trajectories and the rulings of a grating. The effect of conical diffraction arising here changes drastically the space distribution of the radiation. By contrast to the only existing approach, described by Haeberle et al. [Phys. Rev. E 55, 4675 (1997)], which requires difficult numerical calculations, we give a fully analytic theory of SPR. Also, in this paper we present for the first time the theory of x-ray Smith-Purcell radiation. Evanescent waves on the surface are shown to lead to strong enhancement of Smith-Purcell radiation, through a resonant mechanism. The results are important for the description of real divergent high-brightness beams and for the development of novel noninvasive diagnostic schemes based on the Smith-Purcell effect.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85490494","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: 24

Racetrack-shape fixed field induction accelerator for giant cluster ions 跑道形状的固定场感应加速器，用于巨大的簇离子

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-08 DOI: 10.1103/PHYSREVSTAB.18.050101

K. Takayama, T. Adachi, M. Wake, K. Okamura

引用次数: 10

Research and development towards duty factor upgrade of the European X-Ray Free Electron Laser linac 欧洲x射线自由电子激光直线加速器占空因数升级的研究与开发

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-05-07 DOI: 10.1103/PHYSREVSTAB.18.050701

J. Sekutowicz, V. Ayvazyan, M. Barlak, J. Branlard, W. Cichalewski, W. Grabowski, D. Kostin, J. Lorkiewicz, W. Merz, R. Nietubyć, R. Onken, A. Piotrowski, K. Przygoda, E. Schneidmiller, M. Yurkov

引用次数: 23