2018 IEEE Advanced Accelerator Concepts Workshop (AAC)最新文献_第6页

Field Emission from Silicon Nanocones Cathodes 硅纳米锥阴极的场发射

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659413

O. Mohsen, Anusorn Lueansaramwong, S. Valluri, V. Korampally, P. Piot, S. Chattopadhyay

引用次数: 2

Detuned-Structure-Based Beam-Driven Accelerator 基于失谐结构的光束驱动加速器

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659386

Yong Jiang, X. Chang, S. Shchelkunov, Lin Wang, J. Hirshfield

{"title":"Detuned-Structure-Based Beam-Driven Accelerator","authors":"Yong Jiang, X. Chang, S. Shchelkunov, Lin Wang, J. Hirshfield","doi":"10.1109/AAC.2018.8659386","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659386","url":null,"abstract":"An experimental research is being conducted at the Yale University Beam Physics Laboratory, aiming to confirm fundamental aspects of an as-yet untested two-beam collinear electron accelerator concept employing a detuned bimodal cavity structure. The features of this novel beam-driven accelerator concept include (i) interleaving of bunches of the low-current accelerated beam with bunches of the high-current drive beam, while both beams move along the same central axis in the structure; (ii) excitation by the drive beam of two modes of each cavity in the structure, with the frequency of the higher mode equal to three times the frequency of the fundamental TM010mode; and (iii) detuning of the cavity modes away from the frequency of the accelerated and drive beam bunches, and their third harmonic. Advantages that are anticipated from this approach include (a) operation at higher acceleration gradient with lower breakdown and pulsed heating rates than for a structure of single-mode cavities at the same acceleration gradient, due to the unconventional spatiotemporal field distributions in the bimodal cavities; (b) realization of a transformer ratio well above two, due to the detuning of the cavity modes; and (c) greater system simplicity and lower cost than for a two-beam accelerator with separate drive and accelerated beam-lines. The recent R&D progress is presented.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124612757","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

Experimental Opportunities for the Ion Channel Laser 离子通道激光器的实验机会

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659422

M. Litos, R. Ariniello, C. Doss, K. Hunt-Stone, J. Cary

{"title":"Experimental Opportunities for the Ion Channel Laser","authors":"M. Litos, R. Ariniello, C. Doss, K. Hunt-Stone, J. Cary","doi":"10.1109/AAC.2018.8659422","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659422","url":null,"abstract":"The ion channel laser (ICL) was originally proposed as a compact, plasma-based alternative to the free electron laser (FEL) [1]. It is, in many ways, analogous to the FEL, though it offers some distinct advantages all on its own. Most notably, the ICL can accommodate a larger electron energy spread, making it better suited for high-brightness plasma-injected beams. In addition, the same radiator (plasma source) can be used to produce elliptically polarized light without alteration, a feature that is absent in an FEL. Historically, electron beam quality and plasma source development were insufficient for the demonstration of the ICL. In addition, the ICL appeared unfavorable due to the inherently short Rayleigh length of the radiation it produced. Recent literature, however, has shown that high gain can be achieved, despite the short Rayleigh length [2]. In addition, current and near-future facilities are able to provide appropriate beams and plasma sources for the ICL. Experimental opportunities to demonstrate an ICL at the Facility for Advanced Accelerator Experimental Tests II (FACET-II) are presented, utilizing both a 10 GeV beam originating from the SLAC National Accelerator Laboratory linac, and a 1 GeV high-brightness, plasma-injected beam.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129142782","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

Fabrication of Micron-Scale Diamond Field Emitter Arrays for Dielectric Laser Accelerators 介质激光加速器用微米级金刚石场发射阵列的制备

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659407

Dongsung Kim, H. Andrews, B. Choi, E. Simakov

引用次数: 4

Summary of Working Group 7: Radiation Generation and Advanced Concepts 第七工作组:辐射的产生和先进概念摘要

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659394

Nikolai Yamnolskv, N. Lemos

引用次数: 0

Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets 激光等离子体加速器电子束产生相干光跃迁辐射干涉条纹的观测

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659381

A. Lumpkin, M. LaBerge, D. Rule, R. Zgadzaj, A. Hannasch, M. Downer, O. Zarini, B. Bowers, A. Irman, J. Couperus, A. Debus, Alexander Kohler, U. Schramm

{"title":"Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets","authors":"A. Lumpkin, M. LaBerge, D. Rule, R. Zgadzaj, A. Hannasch, M. Downer, O. Zarini, B. Bowers, A. Irman, J. Couperus, A. Debus, Alexander Kohler, U. Schramm","doi":"10.1109/AAC.2018.8659381","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659381","url":null,"abstract":"We report initial observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched electrons from laser-driven plasma accelerators (LPAs). These are revealed in the angular distribution patterns obtained by a CCD camera with the optics focused at infinity, or the far-field, viewing a Wartski two-foil interferometer. The beam divergences deduced by comparison to results from an analytical model are sub-mrad, and they are smaller than the ensemble vertical beam divergences measured at the downstream screen of the electron spectrometer. The transverse sizes of the beamlet images were obtained with focus at the object, or near field, and were in the few-micron regime as reported by LaBerge et al. [8]. The enhancements in intensity are significant relative to incoherent optical transition radiation (OTR) enabling multiple cameras to view each shot. We present two-foil interferometry effects coherently enhanced in both the 100-TW LPA at 215 MeV energy at Helmholtz-Zentrum Dresden-Rossendorf and the PW LPA at 1.0-GeV energy at the University of Texas-Austin. A transverse emittance estimate is reported for a microbunched beamlet example generated within the plasma bubble.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116252872","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

Beamline Design for Plasma-Wakefield Acceleration Experiments at MAX IV MAX IV等离子体尾流场加速实验的光束线设计

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659401

J. Svensson, H. Ekerfelt, O. Lundh, E. Mansten, J. Andersson, M. Kotur, F. Lindau, S. Thorin, T. Charles

{"title":"Beamline Design for Plasma-Wakefield Acceleration Experiments at MAX IV","authors":"J. Svensson, H. Ekerfelt, O. Lundh, E. Mansten, J. Andersson, M. Kotur, F. Lindau, S. Thorin, T. Charles","doi":"10.1109/AAC.2018.8659401","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659401","url":null,"abstract":"The MAX IV Laboratory is a synchrotron radiation user facility located just outside the city of Lund, Sweden. The facility is made up of two storage rings, at 3 GeV and 1.5 GeV, respectively, and a linear accelerator, serving as a full-energy injector for the rings as well as a driver for the Short-Pulse Facility (SPF) located downstream of the extraction point to the 3 GeV ring. Recently, as part of the Soft X-ray Laser (SXL) project, a design study towards using the linac as a soft X-ray free-electron laser (FEL) driver was started. Part of the study is the design and commissioning of a diagnostics beamline based on a Transverse Deflecting Structure (TDS). Moreover, the PlasMAX collaboration is working towards using the MAX IV linac also for beam-driven plasma-wakefield (PWFA) experiments. Therefore, the design of the diagnostics beamline is being done to also accommodate an interaction chamber and final focusing, located upstream of the TDS. This proceeding details the current status of the beamline design and shows some preliminary single- and double-bunch current measurements.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121841473","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: 4

Comparison of Conservation Behavior in Several Variationally Derived Implementations for Simulating Electromagnetic Plasmas 几种变分实现中电磁等离子体模拟的守恒行为比较

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659406

A. Stamm, B. Shadwick

引用次数: 0

Characteristics of High Electron Beam Generation and Dose Distribution in Laser Wakefield Accelerator for Cancer Treatment 激光韦克菲尔德加速器治疗肿瘤的高电子束产生特性及剂量分布

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659415

K. Kim, Y. Hwangbo, S. Jeon, Jaehoon Kim

{"title":"Characteristics of High Electron Beam Generation and Dose Distribution in Laser Wakefield Accelerator for Cancer Treatment","authors":"K. Kim, Y. Hwangbo, S. Jeon, Jaehoon Kim","doi":"10.1109/AAC.2018.8659415","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659415","url":null,"abstract":"A laser wakefield accelerator (LWFA) can accelerate electrons using the interaction between high-intensity laser pulses and plasma. We developed and studied a small cancer treatment device using a 16-TW ultra-short high power laser based LWFA system and conducted further research to build a high-efficiency LWFA using a specific plasma density structure. The optimal acceleration condition was confirmed using a two-dimensional (2D) particle-in-cell (PIC) simulation, using the EPOCH 2D code. From the plasma density up-ramp structure, an electron beam energy of 210 MeV was obtained, which is 1.5 times higher than that obtained from the uniform plasma distribution. In addition, an electron beam energy of 70 MeV was obtained by ionization injection from a gas mixture of helium containing 10% nitrogen. A Gafchromic film was used to measure the three-dimensional dose distribution of the beam. The measured dose distributions are similar to those of high-energy electron beams with a narrow pencil-beam distribution. The dose distribution along the depth is similar to that obtained using the GEANT4 code, which considers the energy distribution of the electron beam. As the electron beam energy increases, the penetration depth is expected to increase, which suggests the possibility of developing an effective cancer treatment device.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"33 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125854791","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: 0

External Electron Injection for the AWAKE Experiment 用于AWAKE实验的外部电子注入

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659402

M. Turner, C. Bracco, S. Gessner, B. Goddard, E. Gschwendtner, P. Muggli, Felipe Pefia Asmus, F. Velotti, L. Verra

引用次数: 9