Speaker
Description
We demonstrate that a hard X-ray storage ring free-electron laser oscillator (SRFELO) with steady-state output is feasible using nominal APS-U parameters. Numerical simulations using a planar undulator yield a 5.2 keV configuration that exceeds 6% gain, even within a strict 5-meter insertion device limit. We present a comparative study between results using an Elegant and Genesis-based python wrapper code and a 1D FEL code made internally. The code provides a self-consistent model by coupling 3 ODEs for multi-slice FEL growth with a Fokker-Planck solver to evolve electron bunch moments between passes. We observe a saturation regime where FEL-induced heating balances synchrotron radiation damping, reaching an equilibrium consistent with the Renieri limit. These results indicate that the APS-U can support a hard X-ray SRFELO, marking a promising avenue toward fifth-generation light sources.
Funding Agency
This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science and is based on work supported by the U.S. DOE Office of Science-Basic Energy
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