3 papers
physics.acc-ph2026
An x-ray regenerative amplifier free-electron laser with a step-tapered-undulator
Henry P. Freund, P. J. M. van der Slot, P. G. O'Shea
Regenerative amplifier x-ray free-electron lasers constitute alternative configurations for fourth generation light sources which are typically operated in self-amplified spontaneo…
physics.optics2025
Efficiency enhancement in regenerative amplifier free-electron lasers using a tapered undulator
Henry Freund, Peter van der Slot, Patrick O'Shea
Recent progress in short wavelength free-electron lasers extending from the extreme ultraviolet through the x-ray regime have opened new avenues for industrial and research applica…
physics.acc-ph2024
The Generation of Variable Polarization States in Terawatt X-Ray Free-Electron Lasers
Henry P. Freund, Patrick G. O'Shea
Terawatt x-ray free-electron lasers (XFELs) represent the frontier in further development of x-ray sources and require high current densities with strong transverse focusing. In th…