Department of Physics, Center for Attosecond Science and Technology, Pohang University of Science and Technology, Pohang, 37673, South Korea.
Max Planck Center for Attosecond Science, MPK, POSTECH, Pohang, 37673, South Korea.
Sci Rep. 2016 Nov 28;6:37700. doi: 10.1038/srep37700.
Attosecond metrology using laser-based high-order harmonics has been significantly advanced and applied to various studies of electron dynamics in atoms, molecules and solids. Laser-based high-order harmonics have a limitation of low power and photon energies. There is, however, a great demand for even higher power and photon energy. Here, we propose a scheme for a terawatt attosecond (TW-as) X-ray pulse in X-ray free-electron laser controlled by a few cycle IR pulse, where one dominant current spike in an electron bunch is used repeatedly to amplify a seeded radiation to a terawatt level. This scheme is relatively simple, compact, straightforward, and also produces a temporally and spectrally clean pulse. The viability of this scheme is demonstrated in simulations using Pohang accelerator laboratory (PAL)-XFEL beam parameters.
基于激光的高阶谐波的阿秒计量学已经得到了显著的发展，并应用于原子、分子和固体中电子动力学的各种研究。基于激光的高阶谐波的功率和光子能量有限。然而，人们对更高的功率和光子能量有很大的需求。在这里，我们提出了一种在几周期 IR 脉冲控制下的太瓦级阿秒（TW-as）X 射线脉冲的方案，其中一个电子束中的一个主要电流尖峰被重复使用，将种子辐射放大到太瓦级。该方案相对简单、紧凑、直接，并且还产生了时间和光谱上干净的脉冲。利用浦项加速器实验室（PAL）-XFEL 束参数的模拟证明了该方案的可行性。
