两级合相增强谐波产生全相干硬X射线
Fully coherent hard X-ray generation by two-stage of Phase-merging Enhanced Harmonic Generation
摘要：
种子自由电子激光级联是产生全相干X射线辐射的一种有效方法。本文研究了一种新的产生相干硬X射线的方法，即级联最近提出的相位合并增强谐波产生（PEHG）。该方案包括一个狗腿和两个PEHG配置，这可能是未来X射线自由电子激光装置的提取波荡器分支的主要候选人之一。实验结果表明，该方案在现有技术条件下是可行的，能够产生高亮度、窄带宽、完全相干的X射线辐射脉冲，初始200 nm种子激光转换后的1埃波长辐射峰值功率超过2 GW。
英文摘要：
Cascading stages of seeded free electron laser (FEL) is a promising way to produce fully coherent X-ray radiations. We study a new approach to produce coherent hard X-rays by cascading the recently proposed phase-merging enhanced harmonic generation (PEHG). The scheme consists of one dogleg and two PEHG configurations, which may be one of the leading candidates for the extracted undulator branch in future X-ray FEL facilities. FEL physics studies show that such a scheme is feasible within the present technology and can provide high brightness X-ray radiation pulses with narrow bandwidth and fully coherence, and the radiated peak power at 1 angstrom wavelength converted from an initial 200 nm seed laser is over 2 GW.
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