论文标题
在偶极磁体中的激光梁相互作用的首次观察
First observation of laser-beam interaction in a dipole magnet
论文作者
论文摘要
作为新一代的光源，自由电子激光器（Fels）在Angstrom-Femtsecond时空和时间尺度上提供高亮度X射线脉冲。 FEL背后的基本物理是电磁波和相对论电子光束之间的相互作用，该电源梁由数百或数千个带有交替磁场的偶极磁体组成。在这里，我们报告了纯偶极磁铁中激光束相互作用的第一个观察结果，其中测量了具有40盎司振幅和266 nm周期的电子束能量调制。我们证明，这种能量调制可用于发射播种的FEL，也就是说，在高增强谐波生成方案中以种子激光器的第六次谐波进行激光。结果揭示了FEL激光的最基本过程，并为研究和开发激光束相互作用打开了新的方向。
As a new-generation light source, free-electron lasers (FELs) provide high-brightness X-ray pulses at the angstrom-femtosecond space and time scales. The fundamental physics behind the FEL is the interaction between an electromagnetic wave and a relativistic electron beam in an undulator, which consists of hundreds or thousands of dipole magnets with an alternating magnetic field. Here, we report the first observation of the laser-beam interaction in a pure dipole magnet, in which the electron beam energy modulation with 40-keV amplitude and 266-nm period is measured. We demonstrate that such an energy modulation can be used to launch a seeded FEL, that is, lasing at the sixth harmonic of the seed laser in a high-gain harmonic generation scheme. The results reveal the most basic process of the FEL lasing and open up a new direction for the study and exploitation of laser-beam interactions.
