Coherent X-rays with Tunable Time-Dependent Polarization
Abstract
We describe a method for producing high power, coherent x-ray pulses from a free electron laser with femtosecond scale periodic temporal modulation of the polarization vector. This approach relies on the generation of a temporal intensity modulation after self seeding either by modulating the seed intensity or the beam current. After generating a coherent temporally modulated -polarization pulse, the electron beam is delayed by half a modulation period and sent into a short orthogonally oriented undulator, serving as a -polarization afterburner. We provide simulations of three configurations for realizing this polarization switching, namely, enhanced self seeding with an intensity modulation generated by 2 color self seeding, enhanced self seeding of a current modulated bunch, and regular self seeding of a current modulated bunch. Start to end simulations for the Linac Coherent Light Source-II are provided for the latter.
Cite
@article{arxiv.2009.10914,
title = {Coherent X-rays with Tunable Time-Dependent Polarization},
author = {Nicholas Sudar and Ryan Coffee and Erik Hemsing},
journal= {arXiv preprint arXiv:2009.10914},
year = {2020}
}