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首页> 外文期刊>Journal of synchrotron radiation >Transient thermal stress wave and vibrational analyses of a thin diamond crystal for X-ray free-electron lasers under high-repetition-rate operation
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Transient thermal stress wave and vibrational analyses of a thin diamond crystal for X-ray free-electron lasers under high-repetition-rate operation

机译：在高重复速率运行下X射线自由激光器的瞬态热应力波和薄钻晶体的振动分析

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摘要

High-brightness X-ray free-electron lasers (FELs) are perceived as fourthgeneration light sources providing unprecedented capabilities for frontier scientific researches in many fields. Thin crystals are important to generate coherent seeds in the self-seeding configuration, provide precise spectral measurements, and split X-ray FEL pulses, etc. In all of these applications a high-intensity X-ray FEL pulse impinges on the thin crystal and deposits a certain amount of heat load, potentially impairing the performance. In the present paper, transient thermal stress wave and vibrational analyses as well as transient thermal analysis are carried out to address the thermomechanical issues for thin diamond crystals, especially under high-repetition-rate operation of an X-ray FEL. The material properties at elevated temperatures are considered. It is shown that, for a typical FEL pulse depositing tens of microjoules energy over a spot of tens of micrometers in radius, the stress wave emission is completed on the tens of nanoseconds scale. The amount of kinetic energy converted from a FEL pulse can reach up to ~10 nJ depending on the layer thickness. Natural frequencies of a diamond plate are also computed. The potential vibrational amplitude is estimated as a function of frequency. Due to the decreasing heat conductivity with increasing temperature, a runaway temperature rise is predicted for high repetition rates where the temperature rises abruptly after ratcheting up to a point of trivial heat damping rate relative to heat deposition rate.
机译：高亮度X射线自由电子激光器（FEL）被认为是第四天的光源，为许多领域的前沿科学研究提供了前所未有的能力。薄的晶体是重要的，在自接煤机配置中产生相干种子，提供精确的光谱测量，并在所有这些应用中提供精确的光谱测量和分开的X射线脉冲等。高强度X射线FEL脉冲撞击薄晶体和沉积一定量的热负荷，可能损害性能。在本文中，进行瞬态热应力波和振动分析以及瞬态热分析，以解决薄型金刚石晶体的热机械问题，尤其是在X射线FEL的高重复速率操作下。考虑了升高温度的材料特性。结果表明，对于典型的纤维脉冲在半径的数十微米的点上沉积数十微米能量，应力波发射在数十纳秒刻度上完成。根据层厚度，从FEC脉冲转换的动能的量可以达到至多10 NJ。还计算了钻石板的固有频率。估计电位振动幅度是频率的函数。由于温度升高，导致导热率升高，预测失控温度上升对于高重复速率，其中温度在棘轮上突然上升到相对于热沉积速率的速度传热点。

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