Realizing A Hard X-Ray Storage Ring Free Electron Laser Oscillator at the APS-U
Abstract
We show that the APS-U could support a hard X-ray storage ring free electron laser oscillator, providing a promising avenue toward high repetition rate, narrow bandwidth coherent light sources. The results of our numerical simulations demonstrate that a transverse gradient undulator yields ~8% and ~6% single-pass gain at 8.05 keV and 10 keV respectively. We further identify a configuration at 5 keV that does not require a TGU but still exceeds a 5% gain threshold despite the relatively short 5-meter long insertion device. All cases presented retain spectral purity on the order of meV and reach a steady-state output whose equilibrium is consistent with the Renieri Saturation Limit. We have calculated the 5 keV case to have an average brightness of ~10^26 photons/(s * mm2 * mrad2 * 0.1% BW), representing an increase in more than four orders of magnitude from the standard APS-U undulator. These results indicate that a storage ring free electron laser oscillator at multi-keV photon energies is feasible with nominal APS-U parameters and standard x-ray cavity optics.
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BibTeX
@misc{aneke2026realizing,
title = {{Realizing A Hard X-Ray Storage Ring Free Electron Laser Oscillator at the APS-U}},
author = {Emmanuel Aneke and Kent Wootton and Ryan Lindberg and Chris Jacobsen},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.10419},
eprint = {2608.10419},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.10419},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Realizing A Hard X-Ray Storage Ring Free Electron Laser Oscillator at the APS-U
AU - Emmanuel Aneke
AU - Kent Wootton
AU - Ryan Lindberg
AU - Chris Jacobsen
PY - 2026
DA - 2026/09/21
PB - arXiv
DO - 10.48550/arxiv.2608.10419
UR - https://arxiv.org/abs/2608.10419
AB - We show that the APS-U could support a hard X-ray storage ring free electron laser oscillator, providing a promising avenue toward high repetition rate, narrow bandwidth coherent light sources. The results of our numerical simulations demonstrate that a transverse gradient undulator yields ~8% and ~6% single-pass gain at 8.05 keV and 10 keV respectively. We further identify a configuration at 5 keV that does not require a TGU but still exceeds a 5% gain threshold despite the relatively short 5-meter long insertion device. All cases presented retain spectral purity on the order of meV and reach a steady-state output whose equilibrium is consistent with the Renieri Saturation Limit. We have calculated the 5 keV case to have an average brightness of ~10^26 photons/(s * mm2 * mrad2 * 0.1% BW), representing an increase in more than four orders of magnitude from the standard APS-U undulator. These results indicate that a storage ring free electron laser oscillator at multi-keV photon energies is feasible with nominal APS-U parameters and standard x-ray cavity optics.
ER -