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Inverse Free Electron Laser Interactions with Sub-Picosecond High Brightness Electron Beams.

机译：亚皮秒级高亮度电子束与自由电子的逆相互作用。

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摘要

Advanced accelerators have great promise in reducing the size and cost of high energy colliders as well as bringing high brightness x-ray sources to the laboratory tabletop scale. The inverse free electron laser (IFEL) is a high gradient advanced accelerator scheme that is one of the most ecient ways of transferring energy from a laser to an electron beam. By copropagating a laser and a relativistic electron beam through an undulator in vacuum and taking advantage of resonant ponderomotive motion of the electron beam, IFEL avoids the breakdown associated with other schemes that use a material to couple the laser fields to the electron beams.;This dissertation provides an overview of IFEL, the photoinjector electron beams to be used in IFEL interactions, and two IFEL applications: compression and synchronization of a photoinjector electron beam to a laser application using THz driven IFEL and high gradient acceleration using IFEL.;The numerically investigated THz IFEL application shows that with a 10 microJ THz 8 pulse train, an electron beam bunch length of 100 fs RMS can be compressed to 14 fs RMS and have the beam's time of arrival jitter relative to an external laser reduced by an order of magnitude.;High gradient acceleration by IFEL was examined experimentally at Lawrence Livermore National Laboratory (LLNL). This experiment marks the first attempt to use sub-picosecond time pulse, TW peak power scale titanium:sapphire laser pulses to perform IFEL acceleration. The demonstrated energy gain from 77 to 120 MeV combined with particle tracking simulations shows an accelerating gradient of over 200 MeV/m. Because the laser pulse length is the same order as the slippage experienced by the electron beam with respect to the laser and the time of arrival jitter has been measured to be greater than 2 ps, the overlap is investigated through relative single shot time of arrival measurements using electro-optic sampling based spatial encoding techniques. The temporal overlap measurement was found to be consistent with a cross-correlation model taking into account the independently measured laser and electron beam lengths.
机译：先进的加速器在减小高能对撞机的尺寸和成本以及将高亮度X射线源引入实验室桌面规模方面具有广阔的前景。逆自由电子激光器（IFEL）是一种高梯度高级加速器方案，它是将能量从激光器传输到电子束的最有效方法之一。通过在真空中通过波荡器使激光和相对论电子束共同传播，并利用电子束的共振质子运动，IFEL避免了与使用材料将激光场耦合到电子束的其他方案相关的击穿。论文概述了IFEL，用于IFEL相互作用的光注入电子束以及两种IFEL应用：使用THz驱动IFEL将光注入电子束压缩和同步到激光应用以及使用IFEL进行高梯度加速。 THz IFEL应用表明，使用10 microJ THz 8脉冲序列，可以将100 fs RMS的电子束束长度压缩到14 fs RMS，并使光束相对于外部激光器的到达时间抖动减少一个数量级。 IFEL在劳伦斯·利弗莫尔国家实验室（LLNL）进行了实验，检验了高梯度加速度。该实验标志着首次尝试使用亚皮秒时间脉冲TW峰值功率标度钛：蓝宝石激光脉冲执行IFEL加速。从77 MeV到120 MeV的能量增益与粒子跟踪仿真相结合，显示出超过200 MeV / m的加速梯度。由于激光脉冲长度与电子束相对于激光器的滑移量相同，并且到达抖动时间已测量为大于2 ps，因此通过相对单次到达时间测量来研究重叠使用基于电光采样的空间编码技术。考虑到独立测量的激光和电子束长度，发现时间重叠测量与互相关模型一致。

著录项

  • 作者

    Moody, Joshua Timothy.;

  • 作者单位

    University of California, Los Angeles.;

  • 授予单位 University of California, Los Angeles.;
  • 学科 Physics Elementary Particles and High Energy.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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