Free electron lasers: Present status and future challenges
Free electron lasers: Present status and future challenges
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DOI：
10.1016/j.nima.2010.02.274
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发表时间：
2010-06-01
影响因子：
1.4
通讯作者：
Zholents, A. A.
中科院分区：
文献类型：
--
作者：
Barletta, W. A.;Bisognano, J.;Zholents, A. A.
随着德国软x射线FLASH设备的科学成功以及SLAC直线加速器相干光源的引人注目的调试，自由电子激光器准备成为从远红外到硬x射线的超短时间分辨率或超精细光谱分辨率的可调谐，强烈，相干光子的首要来源。本文考察了FEL性能和底层使能技术的最新进展。在5-10年的时间尺度上，它评估了三种基本机器架构——sase FELs、种子FELs和主要x射线科学用户设施的FEL振荡器的准备状态，并研究了FELs在整个光谱范围内实现其全部潜力所面临的挑战。在软硬x射线中，除了充分的横向相干性外，高纵向相干性将是性能升级的关键；使用基于激光或自播种或振荡器的想法可以预期在质量上优于今天的SASE源。短脉冲，从飞秒到阿秒，可以现实地设想。将高重复率的电子源与超导射频线性加速器耦合在一起，将有可能实现前所未有的平均光束亮度，并且单个加速器综合体将同时为许多用户提供服务。(C) 2010 Elsevier B.V.版权所有
With the scientific successes of the soft X-ray FLASH facility in Germany and the recent spectacular commissioning of the Linac Coherent Light Source at SLAC, free electron lasers are poised to take center stage as the premier source of tunable, intense, coherent photons of either ultra-short time resolution or ultra-fine spectral resolution, from the far infrared to the hard X-ray regime. This paper examines the state of the art in FEL performance and the underlying enabling technologies. It evaluates the state of readiness of the three basic machine architectures-SASE FELs, seeded FELs, and FEL oscillators for the major X-ray science user facilities on the 5-10 years time scale and examines the challenges that lie ahead for FELs to achieve their full potential throughout the entire spectral range. In soft and hard X-rays, high longitudinal coherence, in addition to full transverse coherence, will be the key performance upgrade; ideas using laser-based or self-seeding or oscillators can be expected to be qualitatively superior to today's SASE sources. Short pulses, from femtoseconds to attoseconds, can be realistically envisioned. With high repetition rate electron sources coupled to superconducting radiofrequency linear accelerators, unprecedented average beam brightness will be possible and many users would be served simultaneously by a single accelerator complex. (C) 2010 Elsevier B.V. All rights reserved.