Development of the Ionization-Injection Scheme for Generating High-Quality, Multi-GeV Electron Beams from a Plasma Wake Field Accelerator, Using the FACET Facility at SLAC

等离子体加速是利用与等离子体结构（如电子等离子体波）相关的电场来加速电子等带电粒子的尖端技术。等离子体结构是用超短激光脉冲或粒子束产生的。这项技术提供了一种构建比传统加速器技术小得多的高性能粒子加速器的方法。刺激激光或电子束在等离子体中产生电荷“尾流”。粒子“驾驭”这种波，因此在这种被称为等离子尾流场加速（PWA）的技术中被加速。利用粒子加速的新模式可以产生重大影响，因为加速器代表了解决医学和工业中许多应用的重要技术工具。该合同将侧重于开发等离子体尾流场加速器的电离注入。为了制造一个实用的PWA装置，必须控制足够能量的电子的窄能量扩散并将其注入等离子体。这个奖项将允许这些电子束的发展，称为束。这项工作将包括演示小束可以被控制，并可以调整到所需的能量。如果成功，这项工作将解决在等离子体尾流中精确（自）放置超短电子束的问题，该电子束可以从尾流中提取大量能量，并有可能产生极低发射率的光束。这里提出的想法的成功演示将极大地影响未来加速器和光源的发展。更广泛的影响现代束流物理/加速器科学需要比传统加速器领域（如激光科学、等离子体物理和原子物理）目前提供的更广泛领域的培训。该奖项将为具有如此广泛背景的优秀学生提供这类培训。如果成功，这项工作所追求的想法可能会改变未来的粒子加速器和光源。

Plasma acceleration is a cutting-edge technique for accelerating charged particles such as electrons using the electric field associated with a plasma structure, such as an electron plasma wave. The plasma structure is created using either ultra-short laser pulses or particle beams. This technique offers a way to build high performance particle accelerators of much smaller size than conventional accelerator techniques. The stimulating laser or electron beam creates a charge "wake" in the plasma. Particles "ride" this wave and are thus accelerated in this technique called plasma wakefield acceleration (PWA). Exploiting new modes for particle acceleration can have significant impact, as accelerators represent a significant technological tool addressing many applications in medicine and industry.This award will focus on developing ionization injection for plasma wakefield accelerators. To make a practical PWA device, a narrow energy spread of electrons of sufficient energy must be controlled and injected into the plasma. This award will allow the development of these electron bunches, called bunchlets. The work will include a demonstration that the bunchlets can be controlled and can be tuned to a desired energy.Intellectual MeritIf successful this work will solve the problem of precisely (self-) placing an ultra-short electron bunch in the plasma wake that can extract a significant amount of energy from the wake and has the potential to generate extremely low emittance beams. The successful demonstration of the ideas presented here will greatly impact both future accelerator and light source development.Broader ImpactsModern beam physics/accelerator science needs a workforce with training in broader areas than currently offered within the conventional accelerator field such as laser science, plasma physics and atomic physics. This award will provide this type of training to excellent students with just such a broad background. If successful, the ideas pursued in this work could potentially transform future particle accelerator and light sources.