Very high brightness and power LCLS-II hard X-ray pulses
Abstract
We show the feasibility of generating X-ray pulses in the 4 to 8 keV fundamental photon energy range with 0.65 TW peak power, 15 fs pulse duration, bandwidth, using the LCLS-II copper linac and hard X-ray (HXR) undulator. Third harmonic pulses with 8-12 GW peak power and narrow bandwidth are also generated. High power and small bandwidth X-rays are obtained using two electron bunches separated by about 1 ns, one to generate a high power seed signal, the other to amplify it by tapering the magnetic field of the HXR undulator. The bunch delay is compensated by delaying the seed pulse with a four crystals monochromator. The high power seed leads to higher output power and better spectral properties, with 94\% of the X-ray power being within the near transform limited bandwidth. We discuss some of the experiments made possible by X-ray pulses with these characteristics, like single particle imaging and high field physics.
Keywords
Cite
@article{arxiv.1812.04661,
title = {Very high brightness and power LCLS-II hard X-ray pulses},
author = {Aliaksei Halavanau and Franz-Josef Decker and Claudio Emma and Jackson Sheppard and Claudio Pellegrini},
journal= {arXiv preprint arXiv:1812.04661},
year = {2019}
}