论文标题
使用基于等离子体的加速度的高亮度电子的高亮度电子束在X射线波长束
Generation and acceleration of high brightness electrons beams bunched at X-ray wavelengths using plasma-based acceleration
论文作者
论文摘要
我们使用粒子中的粒子（PIC）模拟和理论分析表明，高质量的电子束的密度在Angstrom尺度下调制，可以在非线性等离子体波波唤醒中直接使用密度倾斜注入来直接生成。密度调制在调制期间打开和关闭电子的注入。由于电子的初始位置与尾流内部的最终捕获位置之间的独特纵向映射，这会导致电子束在波长范围内的密度调制量的尺寸比等离子密度调制短。两个相同频率的两个反向传播激光器的蓬代作用力可以在激光波长的一半下产生密度调制。假设激光波长为$ 0.8 \ micro \ meter $，则完全自以为是的Osiris PIC模拟表明，该方案可以生成在10s和100埃100埃埃斯特词之间调制的高质量光束。这样的光束可以通过通过共振式解散器来产生完全连贯的，稳定的GW X射线。
We show using particle-in-cell (PIC) simulations and theoretical analysis that a high-quality electron beam whose density is modulated at angstrom scales can be generated directly using density downramp injection in a periodically modulated density in nonlinear plasma wave wakefields. The density modulation turns on and off the injection of electrons at the period of the modulation. Due to the unique longitudinal mapping between the electrons' initial positions and their final trapped positions inside the wake, this results in an electron beam with density modulation at a wavelength orders of magnitude shorter than the plasma density modulation. The ponderomotive force of two counter propagating lasers of the same frequency can generate a density modulation at half the laser wavelength. Assuming a laser wavelength of $0.8\micro\meter$, fully self-consistent OSIRIS PIC simulations show that this scheme can generate high quality beams modulated at wavelengths between 10s and 100 angstroms. Such beams could produce fully coherent, stable, hundreds of GW X-rays by going through a resonant undulator.
