2018 IEEE Advanced Accelerator Concepts Workshop (AAC)最新文献_第7页

CO2-Laser-Driven Dielectric Laser Accelerator co2激光驱动介电激光加速器

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659403

W. Kimura, I. V. Poaorelsky, L. Schächter

{"title":"CO2-Laser-Driven Dielectric Laser Accelerator","authors":"W. Kimura, I. V. Poaorelsky, L. Schächter","doi":"10.1109/AAC.2018.8659403","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659403","url":null,"abstract":"In dielectric laser accelerators (DLAs), the electrons traverse through a channel whose structure period and transverse dimensions are comparable to the laser wavelength. If a 1-µm laser wavelength is used, this means the acceleration channel width must be less than or equal to 1 µm, which severely restricts the amount of charge that can be passed through the channel and places high demands on the electron beam emittance. Using a CO2 laser operating at 10 µm wavelength to drive the DLA enlarges the dimensions of the channel by 10 times. This increases the amount of charge that can be accelerated by orders of magnitude and eases the emittance requirements. As an additional improvement, we are proposing using an inverse free electron laser (IFEL), driven by a portion of the CO2 laser beam, to generate microbunches that are injected into the DLA. This allows maximizing the number of accelerated electrons and minimizing their energy spread, thereby improving the output beam quality. Other advantages of our approach include facilitating achieving phase synchronization of the microbunches within each DLA stage due to the longer laser wavelength and easing fabrication of the microstructures with acceptable tolerances because the structures are 10 times larger. To illustrate the scalability of this concept, we present a straw man design for a high-repetition-rate, high-peak-power CO2 laser system capable of driving multi-stage DLAs up to the energy and luminosity requirements for a future collider. Innovative features of this design include utilizing solid-state lasers (Fe: ZnSe) for pumping the CO2 amplifiers rather than conventional discharge pumping and recirculating laser power through the amplifiers to support high-efficiency, high-repetition-rate, multi-bunch acceleration.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"43 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":"130878572","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: 6

Optimization of the Compact Gamma-ray Source Based on Inverse Compton Scattering Design 基于逆康普顿散射设计的紧凑型伽玛射线源优化

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659417

Han Chen, Yingchao Du, Lixin Yan, Jiaru Shi, Wenhui Huang, Chuanxiang Tang

{"title":"Optimization of the Compact Gamma-ray Source Based on Inverse Compton Scattering Design","authors":"Han Chen, Yingchao Du, Lixin Yan, Jiaru Shi, Wenhui Huang, Chuanxiang Tang","doi":"10.1109/AAC.2018.8659417","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659417","url":null,"abstract":"Recently a MeV quasi-monochromatic compact gamma-ray source with high peak spectral density based on the inverse Compton scattering (ICS) has been proposed in the Department of Engineering Physics, Tsinghua University. This type compact gamma-ray source will be used for advanced X/gamma-ray imaging application based on the nuclear resonance Fluorescence (NRF) [1]. The machine size and the peak spectral density of scattered photons are the most important parameters for such applications. In order to make the source compact enough, a compact commercial narrow bandwidth Nd: Yag laser system with ~50 fs FWHM duration and ~1.5 J maximum energy per pulse is selected as the scattering laser, and the linac is proposed to combine a photo-injector and an X-band main linac to obtain high quality 250 MeV maximum energy electron beam with high charge (~ 200 pC) and low transverse and longitudinal emittance. In ICS, the properties of the generated photons are determined by the parameters of the incident laser and electron beam, and also their interaction geometry. In this paper, we will present the optimization of the linac design. We systematically simulate and optimize the linac design with Matlab, Astra [2] and Cain [3]. In the simulations and optimizations, we use differential evolution algorithm for simultaneous optimization of multiple parameters. Three possible types of photo-injector, S-band photocathode RF(radio frequency) gun with S-band booster, C-band photocathode RF gun with C-band booster, X-band photocathode RF gun with X-band booster, are systematically optimized and compared. We also analyzed wakefield effect on the electron beam quality.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"38 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":"133552006","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

Transverse Wakefield Control via Phase-Matched Laser Modes in Plasma Channels 等离子体通道中相位匹配激光模式的横向尾流场控制

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659427

B. Djordjević, C. Benedetti, C. Schroeder, E. Esarey, W. Leemans

引用次数: 0

Compression of Terawatt Long-Wavelength Laser Pulses Through Backward Raman Amplification 利用反向拉曼放大压缩太瓦长波激光脉冲

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659390

Yu-Hsin Chen, L. Johnson, D. Gordon, D. Kaganovich, B. Hafizi, M. Babzien, M. Polyanskiy, I. Pogorelsky, M. Palmer

引用次数: 1

Generation of Coherent Monochromatic Betatron Radiation by Laser-triggered Ionization Injection in Plasma Accelerators 等离子体加速器中激光触发电离注入产生相干单色电子辐射

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659443

B. Guo, Xinlu Xu, J. Hua, Yipeng Wu, C. Pai, W. Lu

引用次数: 2

Generation of Broadband THz Pulses by Laser Wakefield at Radial Boundary of Plasma Column 等离子体柱径向边界激光尾流场产生宽带太赫兹脉冲

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659420

S. Kalmykov, A. Englesbe, J. Elle, A. Schmitt-Sody

{"title":"Generation of Broadband THz Pulses by Laser Wakefield at Radial Boundary of Plasma Column","authors":"S. Kalmykov, A. Englesbe, J. Elle, A. Schmitt-Sody","doi":"10.1109/AAC.2018.8659420","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659420","url":null,"abstract":"Photoionization of an ambient gas by a tightly focused, femtosecond, weakly relativistic laser pulse leaves behind the pulse a column of electron density (a “filament”). At the column surface, the density drops to zero within a thin (micron-scale) boundary layer. Ponderomotive force of the pulse drives within the filament a cylindrical wave of charge separation (laser wake). If the pulse waist size is much smaller than the Langmuir wavelength, electron current in the wake is mostly transverse. In the filament surface area, this current rapidly decays (electrons, crossing the sharp density gradient, phase out of wake within a few Langmuir oscillation cycles.) Coupling electron wake velocity to the sharp radial density gradient generates at the filament surface a short-lived, almost aperiodic rotational current. This current serves as a source for a broadband THz electromagnetic pulse co-moving with the wake. As long as the background gas is uniform, the wake phase velocity is slightly subluminal, and the THz pulse is evanescent in the radial direction. The evanescence is, however, slow, occurring on a millimeter to centimeter length scale. Properties of the evanescent THz pulse contain information on the wake currents, and may thus serve as optical diagnostics.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"27 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":"132555014","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

Generation and Acceleration of the Trailing Positron Bunch Using a Drive- Trailing Electron Bunch Configuration 利用驱动-拖尾电子束结构产生和加速拖尾正电子束

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659435

Hiroki Fujii, W. An, K. Marsh, W. Mori, C. Joshi

引用次数: 0

Summary of Working Group 5: Beam Sources, Monitoring, and Control 第五工作组总结:波束源、监测和控制

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2018-08-01 DOI: 10.1109/AAC.2018.8659379

N. Moody, R. Tarkeshian

引用次数: 0

Novel Fast Simulation Technique for Axisymmetric Plasma Wakefield Acceleration Configurations in the Blowout Regime 井喷状态轴对称等离子体尾流场加速结构的快速模拟新技术

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 2017-10-23 DOI: 10.1103/PhysRevAccelBeams.21.071301

P. Baxevanis, G. Stupakov

引用次数: 3

Electron Beam Guiding with a Laser Bessel Beam 用激光贝塞尔光束引导电子束

2018 IEEE Advanced Accelerator Concepts Workshop (AAC) Pub Date : 1900-01-01 DOI: 10.1109/aac.2018.8659383

L. Schächter, W. Kimura

引用次数: 3