Production of a femtosecond X-ray pulse using an electron beam driven by laser-plasma acceleration and its applications to time-resolved X-ray diffraction

我们已经证明了通过激光康普顿散射（LCS），这是一个飞秒激光脉冲的准单能电子（QME）束的散射与激光等离子体加速驱动的窄能量扩展的X射线脉冲的产生。使用含有70 pC电子的QME束产生具有约5 mrad的发散角的良好准直的X射线束，其中在单能峰中具有60 MeV的能量。X射线光子数估计为每脉冲2E+7，这与使用射频加速器的LCS X射线源中实现的光子数相当。的X射线的峰值能量估计为60千电子伏的数值模拟使用QME束的测量特性。还建议X射线脉冲持续时间为100 fs的量级。

We have demonstrated X-ray pulse generation via laser Compton scattering (LCS), which is the scattering of a femtosecond laser pulse off a quasi-monoenergetic electron (QME) beam with a narrow energy spread driven by laser-plasma acceleration. A well-collimated X-ray beam with a divergence angle of approximately 5 mrad is produced using a QME beam containing 70 pC electrons with an energy of 60 MeV in the monoenergetic peak. The X-ray photon number is estimated to be 2E+7 per pulse, which is comparable to that achieved in LCS X-ray sources using rf accelerators. The peak energy of the X-rays is estimated to be 60 keV by a numerical simulation using the measured characteristics of the QME beam. It is also suggested that the X-ray pulse duration is on the order of 100 fs.