From Phase Space Manipulation to First Light from a Laser Plasma Accelerator Powered Free Electron Laser

从相空间操纵到激光等离子体加速器驱动的自由电子激光器的第一束光

• 批准号: 1632796
• 负责人: Wim Leemans
• 金额: $ 45万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-15 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1632796&HistoricalAwards=false
• 关键词: Phase; Space; Manipulation; First; Light

The goal of this project is to develop a table-top x-ray source. High-brightness x-ray light sources are indispensible tools to probe chemical, biological, and physical systems. The x-ray source is driven by electron beams generated in an accelerator that relies on very intense laser beams to excite waves in a cloud of ionized gas, a plasma, on which electrons can surf to reach high energies. This technology has already shown that electron beams can be produced from devices that are only a few inches long compared to several-football-field-long accelerators using conventional technology. In order for a lot of x-rays to be generated, the electron beam quality has to be excellent, and this project will demonstrate that such beams can, in fact, be produced. Success of this project will greatly reduce the size of x-ray sources and bring this tool to individual laboratories and investigators, promoting the advancement of science. This project also supports the education of three graduate students, to be trained in the physics of ultra-short beams, laser-plasma interactions, and advanced accelerator concepts.The project aims at developing a compact, ultra-fast (femtosecond), soft X-ray radiation source using beams produced by a laser-plasma accelerator (LPA). Intense radiation can be generated via the undulator radiation mechanism by coupling the ultra-short laser-plasma-accelerated electron beam into a conventional magnetic undulator. Transport of the electron beams will be performed with two magnetic lenses, incorporating recently-developed ultra-strong active plasma lenses, and a chicane for energy dispersion. The latter is critical to reduce the beam slice energy spread, enabling the observation of free-electron laser gain. By fielding undulator-based radiation diagnostics, the electron beam quality will be measured on every shot and will provide the necessary feedback to understand and control the requirements imposed on the laser plasma accelerator and transport lattice to deliver high quality beams. The project consists of three phases: (1) Operate the LPA in a stable and high-charge mode with the new 100-TW-class laser system. (2) Implement and demonstrate the LPA source-to-undulator transport system, and commission an undulator embedded with strong focusing. Ultra-short incoherent undulator radiation with on the order of 10^8 photons per shot in the 10-100 eV range is expected. (3) By tuning the chicane, coherent enhancement of the undulator radiation will be pursued. This light source is intrinsically synchronized to the laser driver, making such a compact source ideal for pump-probe applications in ultrafast science.

该项目的目标是开发台式 X 射线源。 高亮度 X 射线光源是探测化学、生物和物理系统不可或缺的工具。 X射线源由加速器中产生的电子束驱动，加速器依靠非常强的激光束来激发电离气体云（等离子体）中的波，电子可以在等离子体上冲浪以达到高能量。这项技术已经表明，与使用传统技术的几个足球场长的加速器相比，只有几英寸长的设备可以产生电子束。 为了产生大量的 X 射线，电子束质量必须优异，该项目将证明实际上可以产生这样的电子束。该项目的成功将大大缩小X射线源的尺寸，并将这一工具带给各个实验室和研究人员，促进科学的进步。 该项目还支持三名研究生的教育，接受超短光束物理、激光等离子体相互作用和先进加速器概念方面的培训。该项目旨在利用激光等离子体加速器 (LPA) 产生的光束开发紧凑、超快（飞秒）软 X 射线辐射源。通过将超短激光等离子体加速电子束耦合到传统的磁波荡器中，可以通过波荡器辐射机制产生强辐射。电子束的传输将通过两个磁透镜进行，其中包括最近开发的超强活性等离子体透镜和用于能量分散的减速通道。后者对于减少光束切片能量扩散至关重要，从而能够观察自由电子激光增益。通过部署基于波荡器的辐射诊断，将在每次发射时测量电子束质量，并提供必要的反馈，以了解和控制对激光等离子体加速器和传输晶格的要求，以提供高质量的光束。该项目分为三个阶段：(1) 使用新的 100 TW 级激光系统以稳定和高电荷模式运行 LPA。 (2) 实现并演示LPA源到波荡器传输系统，并调试嵌入强聚焦的波荡器。预计在 10-100 eV 范围内每次发射大约 10^8 个光子的超短非相干波荡器辐射。 (3)通过调整减速弯道，将追求波荡器辐射的相干增强。该光源本质上与激光驱动器同步，使得这种紧凑的光源非常适合超快科学中的泵浦探针应用。

项目成果

Filtering higher-order laser modes using leaky plasma channels

使用泄漏等离子体通道过滤高阶激光模式

• DOI: 10.1063/1.5006198
• 发表时间: 2018
• 期刊: Physics of Plasmas
• 影响因子: 2.2
• 作者: Djordjević, B. Z.;Benedetti, C.;Schroeder, C. B.;Esarey, E.;Leemans, W. P.
• 通讯作者: Leemans, W. P.

Measured Emittance Dependence on the Injection Method in Laser Plasma Accelerators

• DOI: 10.1103/physrevlett.119.104801
• 发表时间: 2017-09-05
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Barber, S. K.;van Tilborg, J.;Leemans, W. P.
• 通讯作者: Leemans, W. P.

Comparative study of active plasma lenses in high-quality electron accelerator transport lines

高质量电子加速器传输线中活性等离子体透镜的比较研究

• DOI: 10.1063/1.5018001
• 发表时间: 2018
• 期刊: Physics of Plasmas
• 影响因子: 2.2
• 作者: van Tilborg, J.;Barber, S. K.;Benedetti, C.;Schroeder, C. B.;Isono, F.;Tsai, H.-E.;Geddes, C. G.;Leemans, W. P.
• 通讯作者: Leemans, W. P.

Control of quasi-monoenergetic electron beams from laser-plasma accelerators with adjustable shock density profile

• DOI: 10.1063/1.5023694
• 发表时间: 2018-04-01
• 期刊: PHYSICS OF PLASMAS
• 影响因子: 2.2
• 作者: Tsai, Hai-En;Swanson, Kelly K.;Leemans, Wim
• 通讯作者: Leemans, Wim

Density characterization of discharged gas-filled capillaries through common-path two-color spectral-domain interferometry

通过共路双色谱域干涉测量放电气体毛细管的密度表征

• DOI: 10.1364/ol.43.002776
• 发表时间: 2018
• 期刊: Optics Letters
• 影响因子: 3.6
• 作者: van Tilborg, J.;Gonsalves, A. J.;Esarey, E. H.;Schroeder, C. B.;Leemans, W. P.
• 通讯作者: Leemans, W. P.