Speaker
Description
Cavity-based free-electron lasers (CBXFELs) have the potential to dramatically improve the stability and coherence of FELs. The CBXFEL project is an Argonne, SLAC, RIKEN collaboration to build a 65-m-long rectangular X-ray cavity at the LCLS, to demonstrate low-loss cavity ringdown and two-pass FEL gain. Argonne was responsible for design and construction of the X-ray cavity and SLAC was responsible for CBXFEL installation and preparation of the appropriate linac beam, including chicanes, as well as additional diagnostics. Controls, physics simulations, and commissioning are joint efforts. RIKEN/Sumitomo supplied the high-quality diamond crystal plates that Argonne subsequently laser-machined, thermally treated, and characterized to produce high-reflectivity diamond crystal mirrors for the cavity. Design, fabrication, assembly, and testing of X-ray optics, X-ray diagnostics, and their precision mechanical support and motion systems are complete. Final components were installed in the LCLS tunnel in April 2026. Commissioning with X-rays has begun, including the measurement of first cavity ringdown. Details will be presented. The next stage, fine tuning of the x-ray orbits in the cavity, increasing ring-down lifetime, and demonstration of amplification, will begin after the LCLS summer shutdown.
Funding Agency
Work is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contracts: DE-AC02-06CH11357 (ANL) and DE-AC02-76SF00515 (SLAC).
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