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Observation of High Transformer Ratio from Bunch Shaping Using Emittance Exchange 发射度交换束形高变比的观察
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659416
G. Ha, Q. Gao, E. Wisniewski, J. Power, J. Shao, M. Conde, Wanming Liu, A. Zholents, C. Jing, R. Roussel
{"title":"Observation of High Transformer Ratio from Bunch Shaping Using Emittance Exchange","authors":"G. Ha, Q. Gao, E. Wisniewski, J. Power, J. Shao, M. Conde, Wanming Liu, A. Zholents, C. Jing, R. Roussel","doi":"10.1109/AAC.2018.8659416","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659416","url":null,"abstract":"Argonne Wakefield Accelerator (AWA) group members recently demonstrated transformer ratio enhancement of R=4.8. In the experiment, a triangular drive bunch and a trailing main bunch are passed through a dielectric slab structure (quartz) to generate the wakefield and a subsequent longitudinal phase space measurement system is used to measure R. We generated the drive's triangular current profile with the AWA emittance exchange beamline which allows easy control of the current profile by simple transverse manipulation (e.g. mask). This direct measurement indicated R=4.8 which is the highest measured transformer ratio so far. We present the experimental details in this paper, discuss the status of the high transformer ratio in plasma wakefield acceleration and introduce our future plans.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"19 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":"127321167","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
Investigating Instabilities of Long, Intense Laser Pulses in Plasma Wakefield Accelerators 等离子体尾流场加速器中长强激光脉冲的不稳定性研究
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659421
Jiayang Yan, P. Iapozzuto, Mael Flament, C. Joshi, Y. Jing, Prabhat Kumar, Roman Samulvak, I. Pogorelsky, C. Swinson, M. Babzien, K. Kusche, M. Polyanskiy, M. Fedurin, M. Palmer, W. Mori, R. Zgadzaj, J. Welch, M. Downer, W. Lu, V. Litvinenko, N. Vafaei-Najafabadi, L. Amorim
{"title":"Investigating Instabilities of Long, Intense Laser Pulses in Plasma Wakefield Accelerators","authors":"Jiayang Yan, P. Iapozzuto, Mael Flament, C. Joshi, Y. Jing, Prabhat Kumar, Roman Samulvak, I. Pogorelsky, C. Swinson, M. Babzien, K. Kusche, M. Polyanskiy, M. Fedurin, M. Palmer, W. Mori, R. Zgadzaj, J. Welch, M. Downer, W. Lu, V. Litvinenko, N. Vafaei-Najafabadi, L. Amorim","doi":"10.1109/AAC.2018.8659421","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659421","url":null,"abstract":"Laser wakefield acceleration (LWFA) is a promising method for reducing the cost and size of the state of the art and industrial accelerators. In the recent AE71 experimental campaign at the Brookhaven National Laboratory, a long (4 ps) powerful (300 GW) CO2 laser pulse was sent into a hydrogen gas to produce plasma wakefields. We analyzed the evolution of the laser numerically and found three distinct regions: where the laser self-modulates, where it is transversely disrupted, and where it self-channels. The laser disruption process is similar to the hosing instability that occurs in particle-beam-driven plasma wakefield accelerators. Although hosing instability has been well studied for particle-driven acceleration, the similar instability for long laser pulses has not been clearly explained, and a technique to prevent it is still lacking. Our numerical simulations were done with Particle-In-Cell code OSIRIS. Here we show the impact that plasma ionization and laser focal position have on the interaction of the laser with the plasma in the three distinct regions.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"70 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":"114580555","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
Bimodal Electron Gun R&D 双峰电子枪研发
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659391
Yong Jiang, Lin Wang, S. Shchelkunov, W. Fang, J. Hirshfield
{"title":"Bimodal Electron Gun R&D","authors":"Yong Jiang, Lin Wang, S. Shchelkunov, W. Fang, J. Hirshfield","doi":"10.1109/AAC.2018.8659391","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659391","url":null,"abstract":"A novel Bimodal Electron Gun is designed to apply microwaves at two harmonically-related frequencies in a half-cell RF gun to increase the RF breakdown threshold. This stratagem is intended to allow the RF gun structure to support a high acceleration gradient as well as to manipulate the emittance evolution in the half cell. The superposition of the harmonic field components can provide an engineered spatiotemporal distribution of the cathode field strength and phase by selecting a proper amplitude ratio and phase relationship between the first and second harmonic RF field components. This approach provides multiple control knobs over the cathode field, bunch length, and bunch charge density, and thus the suppression of the space charge effect and RF nonlinearity. The recent status of the Bimodal Electron Gun R&D is presented, including the designs of the novel two frequency directional coupler and rectangular-to-coaxial mode launchers.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"40 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":"124075480","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
Characterization of the Nonlinear Focusing Magnet for Quasi - Integrable Optics Experiments at the University of Maryland Electron Ring 马里兰大学电子环准可积光学实验非线性聚焦磁体的表征
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659376
D. Matthew, William P. Curtiss, H. Komkov, B. Beaudoin
{"title":"Characterization of the Nonlinear Focusing Magnet for Quasi - Integrable Optics Experiments at the University of Maryland Electron Ring","authors":"D. Matthew, William P. Curtiss, H. Komkov, B. Beaudoin","doi":"10.1109/AAC.2018.8659376","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659376","url":null,"abstract":"The University of Maryland Electron Ring (UMER) group is in the process of an experiment to test a new accelerator theory that mitigates beam loss from resonances, yet still supports stable beam orbits [1]. A nonlinear magnet element (an octupole channel consisting of several separate flexible printed circuit boards (PCBs)) has been constructed with preliminary measurements [2]. We present work done to characterize the channel. We use a Velmex stage with a Hall probe to generate gridded magnetic field measurements. This method gives a direct way to achieve fine resolution of the longitudinal dependence of the focusing field, which is a fundamental component of the nonlinear focusing theory. We concluded that the needed octupole strength profile is achievable and that given our assumptions of the measurement error, the magnetic center through the length of the channel remains within an acceptable tolerance.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"20 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":"115058203","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
[Title page] (标题页)
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/aac.2018.8659439
{"title":"[Title page]","authors":"","doi":"10.1109/aac.2018.8659439","DOIUrl":"https://doi.org/10.1109/aac.2018.8659439","url":null,"abstract":"","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"19 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":"129017034","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
High-Efficiency 2 MeV Beam-Driven Accelerator 高效率2 MeV束流驱动加速器
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659378
V. Teryaev, S. Shchelkunov, J. Hirshfield
{"title":"High-Efficiency 2 MeV Beam-Driven Accelerator","authors":"V. Teryaev, S. Shchelkunov, J. Hirshfield","doi":"10.1109/AAC.2018.8659378","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659378","url":null,"abstract":"A novel beam-driven electron accelerator, which we name the Electron Voltage Transformer (EVT), falls into the broad class of two-beam accelerators, but differs significantly from other configurations in that the RF source and the accelerator are built into the same vacuum envelope. Multiple drive beamlets and the beam to be accelerated receive radiofrequency (RF) modulation in a set of RF buncher cavities, from which the beams pass into the accelerating structure. The latter structure comprises decoupled, inductively-tuned cavities, wherein energy is transferred from the drive beams to the accelerated beam. Correct phasing-to achieve initial RF bunching, followed by acceleration-is accomplished by appropriate spacing of the cavity gaps. Preliminary results of numerical simulations are presented for a prototype of EVT, operating at L-band, in which a 6 A 110 kV beam is accelerated to 2 MeV with an overall efficiency of 60%. This unusually-high efficiency, high average power electron beam source should be attractive for a range of industrial applications.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"1 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":"121376946","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
Laser-Plasma - Accelerator-Driven Quasi - Monoenergetic MeV Thomson Photon Source and Laser Facility 激光等离子体加速器驱动的准单能MeV汤姆逊光子源和激光设备
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659433
H. Tsai, C. Geddes, T. Ostermavr, G. O. Muñoz, J. van Tilborg, S. Barber, F. Isono, H. Mao, K. Swanson, R. Lehe, A. Gonsalves, K. Nakamura, C. Tóth, C. Schroeder, E. Esarey, W. Leemans
{"title":"Laser-Plasma - Accelerator-Driven Quasi - Monoenergetic MeV Thomson Photon Source and Laser Facility","authors":"H. Tsai, C. Geddes, T. Ostermavr, G. O. Muñoz, J. van Tilborg, S. Barber, F. Isono, H. Mao, K. Swanson, R. Lehe, A. Gonsalves, K. Nakamura, C. Tóth, C. Schroeder, E. Esarey, W. Leemans","doi":"10.1109/AAC.2018.8659433","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659433","url":null,"abstract":"In this report, we demonstrate precise control of a laser plasma accelerator (LPA) through characterization of a shock-induced density downramp injector. Experiments systematically varied the shock injector profile, including shock angle, shock position, up-ramp width, and acceleration length. As a result, an electron beam that was highly tunable from 30 to 300 MeV with 8.5% energy spread, 1.5 mrad divergence and 0.35 mrad pointing fluctuation was produced. We also report the progress of a project focusing on demonstrating the crucial enablers of a compact LPA based MeV Thomson photon source in an integrated experiment and a dedicated 100 TW laser facility built at the Berkeley Lab Laser Accelerator (BELLA) Center, Lawrence Berkeley National Laboratory (LBNL).","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"57 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":"126012892","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
[Copyright notice] (版权)
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/aac.2018.8659431
{"title":"[Copyright notice]","authors":"","doi":"10.1109/aac.2018.8659431","DOIUrl":"https://doi.org/10.1109/aac.2018.8659431","url":null,"abstract":"","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"98 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":"133766773","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
Mitigation Techniques for Witness Beam Hosing in Plasma - Based Acceleration 基于等离子体的加速度中见证人光束的抑制技术
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659396
L. Hildebrand, W. An, Xinlu Xu, Fei Li, Y. Zhao, M. Hogan, V. Yakimenko, S. Nagaitsev, E. Adli, C. Joshi, W. Mori
{"title":"Mitigation Techniques for Witness Beam Hosing in Plasma - Based Acceleration","authors":"L. Hildebrand, W. An, Xinlu Xu, Fei Li, Y. Zhao, M. Hogan, V. Yakimenko, S. Nagaitsev, E. Adli, C. Joshi, W. Mori","doi":"10.1109/AAC.2018.8659396","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659396","url":null,"abstract":"We present three methods for mitigating the hosing of the witness beam in plasma wakefield acceleration (PWFA) experiments. We will look at a specific case with parameters similar to what will be used in FACET-II (Facility for Advanced Accelerator Experimental Tests). First, we examine adding an energy chirp to the witness beam and how the loading of the beam affects the growth of the energy spread. Next, we look at how an asymmetric (elliptical) drive beam can suppress the hosing of the witness beam by making the focusing force vary along the propagation direction. Finally, we look at the regime where ion collapse from the drive beam suppresses the hosing of the witness beam.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"520 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":"123206952","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
Toward Plasma Wakefield Simulations at Exascale 在百亿亿次的等离子体韦克菲尔德模拟
2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659392
J. Vay, A. Almgren, J. Bell, R. Lehe, A. Myers, Jaehong Park, Olga Shapoval, M. Thévenet, Weiqun Zhang, D. Grote, M. Hogan, L. Ge, C. Ng
{"title":"Toward Plasma Wakefield Simulations at Exascale","authors":"J. Vay, A. Almgren, J. Bell, R. Lehe, A. Myers, Jaehong Park, Olga Shapoval, M. Thévenet, Weiqun Zhang, D. Grote, M. Hogan, L. Ge, C. Ng","doi":"10.1109/AAC.2018.8659392","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659392","url":null,"abstract":"Turning the current experimental plasma accelerator state-of-the-art from a promising technology into mainstream scientific tools depends critically on high-performance, high-fidelity modeling of complex processes that develop over a wide range of space and time scales. As part of the U.S. Department of Energy's Exascale Computing Project, a team composed of Lawrence Berkeley National Laboratory, SLAC Accelerator National Laboratory and Lawrence Livermore National Laboratory researchers is developing a new open-source plasma accelerator simulation tool. The new software will harness the power of future exascale supercomputers for the exploration of outstanding questions in the physics of acceleration and transport of particle beams in chains of plasma channels. This will benefit the ultimate goal of compact and affordable high-energy physics colliders, and many spinoff applications of plasma accelerators along the way. We give an update on some of the code latest developments and discuss future plans.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"95 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":"126245213","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
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