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首页> 外文期刊>Laser and Particle Beams >Time-resolved ionization measurements with intense ultrashort XUV and X-ray free-electron laser pulses
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Time-resolved ionization measurements with intense ultrashort XUV and X-ray free-electron laser pulses

机译：具有激烈的超短XUV和X射线自由电子激光脉冲的时间分辨电离测量

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摘要

Modern free-electron lasers (FEL) operating in XUV (extreme ultraviolet) or X-ray range allow an access to novel research areas. An example is the ultrafast ionization of a solid by an intense femtosecond FEL pulse in XUV which consequently leads to a change of the complex index of refraction on an ultrashort timescale. The photoionization and subsequent impact ionization resulting in electronic and atomic dynamics are modeled with our hybrid code XTANT(X-ray thermal and non-thermal transitions) and a Monte Carlo code XCASCADE(X-ray-induced electron cascades). The simulations predict the temporal kinetics of FEL-induced electron cascades and thus yield temporally and spatially resolved information on the induced changes of the optical properties. In a series of experiments at FERMI and LCLS, single shot measurements with spatio-temporal encoding of the ionization process have been performed by a correlation of the FEL pump pulse with an optical femtosecond probe pulse. An excellent agreement between the experiment and the simulation has been found. We also show that such kind of experiments forms the basis for pulse duration and arrival time jitter monitoring as currently under development for XUV-FELs.
机译：在XUV（极端紫外线）或X射线范围内运行的现代自由电子激光器（FEL）允许进入新型研究领域。一个例子是通过XUV中强烈的飞秒FEL脉冲通过XUV的超速电离，因此导致超短秒形尺寸的复数折射率的变化。导致电子和原子动力学产生的光离移和随后的冲击电离是用我们的混合码XTANT（X射线热和非热转换）和蒙特卡罗码Xcascade（X射线诱导的电子级联）进行建模。仿真预测了FEL诱导的电子级联的时间动力学，从而在时间上和空间上解析了关于光学性质的诱导变化的信息。在FERMI和LCLS的一系列实验中，通过与光学飞秒探针脉冲的熔泵脉冲的相关性来执行具有电离过程的时空编码的单次测量。已经找到了实验与模拟之间的良好协议。我们还表明，这种实验形式构成了脉冲持续时间和到达时间抖动监测的基础，因为XUV-FELS正在开发下。

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