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首页> 外文会议>X-Ray FEL Optics and Instrumentation 30-31 July 2000 San Diego, USA >Radiation properties of the Linac Coherent Light Source: Challenges for x-ray optics
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Radiation properties of the Linac Coherent Light Source: Challenges for x-ray optics

机译：直线加速器相干光源的辐射特性：x射线光学的挑战

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The Linac Coherent Light Source (LCLS) is a free-electron laser (FEL) now in the advanced planning stage at the Stanford Linear Accelerator Center. This machine will employ the process of self-amplified spontaneous emission (SASE) to generate extremely bright pulses of hard x-ray radiation, at wavelengths down to about 1.5A. Being the first laser to operate in this spectral region, it will produce radiation with properties that are radically different in several respects from that produced by any other x-ray source, including today's 3~rd -generation synchrotron sources. Using this radiation to best scientific advantage will place unprecedented demands on the x-ray optics. Most importantly, the LCLS will be a pulsed radiation source, with extremely intense, short pulses and a low duty cycle. It will be possible and desirable to collect a complete experimental data set with a single radiation pulse. This will require optics which manipulate a single pulse so as to cover the full range of parameter space to be studied. Also, because of the very high peak power, sub-picosecond pulse length, and very high coherence of the FEL pulse, optics must be robust, able to preserve the short pulse length, and able to preserve spatial coherence. Finally, since it seems likely that the LCLS FEL radiation will be bright enough to promote nonlinear x-ray processes, there will be a need for optics which emphasize particular nonliear effects.
机译：直线加速器相干光源（LCLS）是一种自由电子激光器（FEL），目前正处于斯坦福线性加速器中心的高级规划阶段。该机器将采用自放大自发发射（SASE）的过程，以产生低亮度的硬X射线辐射脉冲，其波长低至约1.5A。作为在此光谱区域中工作的第一台激光器，它将产生辐射，该辐射的特性与包括今天的第三代同步加速器源在内的任何其他X射线源所产生的特性在几个方面都存在根本性的差异。利用这种辐射获得最佳的科学优势将对X射线光学器件提出前所未有的要求。最重要的是，LCLS将是脉冲辐射源，具有极强的短脉冲和低占空比。用单个辐射脉冲来收集完整的实验数据集将是可能且合乎需要的。这将需要操纵单个脉冲的光学器件，以覆盖要研究的整个参数空间范围。而且，由于非常高的峰值功率，亚皮秒脉冲长度以及FEL脉冲的非常高的相干性，光学器件必须坚固耐用，能够保留短脉冲长度并能够保持空间相干性。最后，由于LCLS FEL辐射似乎足够亮以促进非线性X射线过程，因此需要强调特殊非线性效应的光学器件。

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