Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands.
Phys Rev Lett. 2010 Dec 31;105(26):264801. doi: 10.1103/PhysRevLett.105.264801. Epub 2010 Dec 22.
We demonstrate the compression of 95 keV, space-charge-dominated electron bunches to sub-100 fs durations. These bunches have sufficient charge (200 fC) and are of sufficient quality to capture a diffraction pattern with a single shot, which we demonstrate by a diffraction experiment on a polycrystalline gold foil. Compression is realized by means of velocity bunching by inverting the positive space-charge-induced velocity chirp. This inversion is induced by the oscillatory longitudinal electric field of a 3 GHz radio-frequency cavity. The arrival time jitter is measured to be 80 fs.
我们展示了将 95keV、空间电荷主导的电子束压缩到亚 100fs 持续时间的过程。这些电子束具有足够的电荷量（200fC）和足够的质量，可以在单次拍摄中捕获衍射图案，我们通过在多晶金箔上进行衍射实验证明了这一点。通过反转由正空间电荷引起的速度啁啾来实现速度束压缩。这种反转是由 3GHz 射频腔的振荡纵向电场引起的。测量到的到达时间抖动为 80fs。
