发表机构
Northwestern University; Argonne National Laboratory（西北大学; 阿贡国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究表明APS-U可支持硬X射线储存环自由电子激光振荡器，采用横向梯度波荡器等配置可达到高增益、高亮度，实现多keV光子能量的该振荡器具备可行性。
AI 中文摘要
我们表明，APS-U（高级光子源升级装置）可支持硬X射线储存环自由电子激光振荡器，为实现高重复频率、窄带宽相干光源提供了有前景的途径。数值模拟结果显示，横向梯度波荡器（TGU）在8.05 keV和10 keV时分别产生约8%和约6%的单通增益。我们进一步确定了5 keV的一种配置，该配置无需使用TGU，尽管插入装置仅长5米，仍超过5%的增益阈值。所有呈现的案例均保持meV量级的光谱纯度，并达到与Renieri饱和极限一致的稳态输出。我们计算得出，5 keV案例的平均亮度约为10^26光子/(s·mm²·mrad²·0.1%带宽)，比标准APS-U波荡器提高了四个数量级以上。这些结果表明，利用APS-U的标称参数和标准X射线腔光学元件，实现多keV光子能量的储存环自由电子激光振荡器是可行的。
英文摘要
We show that the APS-U could support a hard X-ray storage ring free electron laser oscillator, providing a promising avenue toward high repetition rate, narrow bandwidth coherent light sources. The results of our numerical simulations demonstrate that a transverse gradient undulator yields ~8% and ~6% single-pass gain at 8.05 keV and 10 keV respectively. We further identify a configuration at 5 keV that does not require a TGU but still exceeds a 5% gain threshold despite the relatively short 5-meter long insertion device. All cases presented retain spectral purity on the order of meV and reach a steady-state output whose equilibrium is consistent with the Renieri Saturation Limit. We have calculated the 5 keV case to have an average brightness of ~10^26 photons/(s * mm2 * mrad2 * 0.1% BW), representing an increase in more than four orders of magnitude from the standard APS-U undulator. These results indicate that a storage ring free electron laser oscillator at multi-keV photon energies is feasible with nominal APS-U parameters and standard x-ray cavity optics.
