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首页> 外文期刊>Moscow University Physics Bulletin >Generation of Coherent Radiation in the Near X-Ray Band by a Cascade FEL with a Two-Frequency Undulator
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Generation of Coherent Radiation in the Near X-Ray Band by a Cascade FEL with a Two-Frequency Undulator

机译：用双频波动器的级联纤维件在近X射线带中产生相干辐射

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摘要

Generation of X-ray radiation in a cascade self-amplified spontaneous emission free-electron laser (SASE FEL) using the harmonics of a two-frequency undulator is studied. The advanced phenomenological model of a one-pass FEL that accounts for the main losses in real FELs is presented: the electron energy spread in the beam, the beam divergence, diffraction, and the fact that emission losses are greater at higher harmonics than in the main frequency range. The FEL mathematical model was performed using the Mathematica software and calibrated within the experiment carried out at the operating SPARC facility via complex three-dimensional numerical simulations. The phenomenological model is used to analyze FEL dynamics for generation of a high-energy X-ray emission at a relatively short length. It is proposed to use a two-frequency undulator for the initial electron grouping and subsequent frequency multiplication in a cascade FEL with higher harmonic amplification (HGHG). The advantages of the two-frequency undulator are presented for electron grouping at higher harmonics of the undulator radiation (UR). The operation of several types of FEL is simulated with amplification of the seed laser wave frequency in two and three cascades to generate the soft X-ray radiation. A seed laser with a wavelength of 11.43 nm corresponding to the peak reflectivity of mirror coatings with MoRu/Be is proposed for generating the intensive X-ray laser radiation with lambda similar to 1.27-3.37 nm. Here, the intensive radiation power reaches 50 MW at a length of only 35 meters; the radiation shows good temporal coherence corresponding to the performance of a low-power seed laser with a lower frequency.
机译：研究了使用双频波动器的谐波的级联自增大自发发射自由电子激光器（SASE FEL）的X射线辐射。介绍了一个单通件FEL的先进现象模型，其占真实纤维中的主要损失：光束中的电子能量蔓延，光束发散，衍射以及排放损耗更高的谐波比在主频率范围。使用Mathematica软件进行FEL数学模型，并通过复杂的三维数值模拟在操作SPARC工具处进行的实验中进行校准。该现象学模型用于分析FEL动力学，以在相对短的长度下产生高能X射线发射。建议使用双频率的波浪器用于初始电子分组和随后的级联FEC中的频率倍增，具有更高的谐波放大（HGHG）。在波动辐射辐射（UR）的较高谐波处，提供了双频率波动器的优点。通过在两个和三个级联中的种子激光波频率的放大来模拟几种类型的FEL的操作，以产生软X射线辐射。提出了一种与Moru / Moru的镜涂的峰值反射率相对应的种子激光，用于产生具有类似于1.27-3.37nm的强化X射线激光辐射。在这里，密集的辐射功率达到50兆瓦，长度仅为35米;辐射显示出与具有较低频率的低功率种子激光的性能对应的良好时间相干性。

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