We describe a new method to produce intensity stable, highly coherent, narrow-band x-ray pulses in self-seeded free electron (FEL) lasers. The approach uses an ultra-short electron beam to generate a single spike FEL pulse with a wide coherent bandwidth. The self-seeding monochromator then notches out a narrow spectral region of this pulse to be amplified by a long portion of electron beam to full saturation. In contrast to typical self-seeding where monochromatization of noisy SASE pulses leads to either large intensity fluctuations or multiple frequencies, we show that this method produces a stable, coherent FEL output pulse with statistical properties similar to a fully coherent optical laser.
@article{arxiv.2004.04607,
title = {Enhanced Self-seeding with Ultra-short Electron Beams},
author = {Erik Hemsing and Aliaksei Halavanau and Zhen Zhang},
journal= {arXiv preprint arXiv:2004.04607},
year = {2020}
}