Generation of bright attosecond x-ray pulse trains via Thomson scattering from laser-plasma accelerators

作者：Luo, W; Yu, T P; Chen, M; Song, Y M; Zhu, Z C^*; Ma, Y Y; Zhuo, H B

来源：Optics Express, 2014, 22(26): 32098-32106.

DOI：10.1364/OE.22.032098

• Advanced Light Source
• All-optical scheme
• Attosecond x-ray pulse
• Electron acceleration
• Focused laser pulse
• Laser Compton scattering
• Laser-plasma accelerator
• Thomson backscattering

Generation of attosecond x-ray pulse attracts more and more attention within the advanced light source user community due to its potentially wide applications. Here we propose an all-optical scheme to generate bright, attosecond hard x-ray pulse trains by Thomson backscattering of similarly structured electron beams produced in a vacuum channel by a tightly focused laser pulse. Design parameters for a proof-ofconcept experiment are presented and demonstrated by using a particle-incell code and a four-dimensional laser-Compton scattering simulation code to model both the laser-based electron acceleration and Thomson scattering processes. Trains of 200 attosecond duration hard x-ray pulses holding stable longitudinal spacing with photon energies approaching 50 keV and maximum achievable peak brightness up to 10(20) photons/s/mm(2)/mrad(2)/0.1%BW for each micro-bunch are observed. The suggested physical scheme for attosecond x-ray pulse trains generation may directly access the fastest time scales relevant to electron dynamics in atoms, molecules and materials.

• 出版日期2014-12-29
• 单位上海交通大学; 南华大学; 中国人民解放军国防科学技术大学