2025/01/03 by H.P. Freund, Freund, Henry, P.G. O’Shea +2
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #Advanced X-ray Imaging Techniques #FOS: Physical sciences #Optics (physics.optics) #Particle Accelerators and Free-Electron Lasers #Photocathodes and Microchannel Plates
paper · pdf · doi:10.48550/arxiv.2501.01911
openalex publication_date 2025/01/03 · openalex created_date 2025/01/07 · openalex updated_date 2026/07/28
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 applications. A high-gain/low-Q oscillator, i.e., a regenerative amplifier free-electron laser (RAFEL), is one possible concept. In this paper, we present the first analysis of efficiency enhancement in a RAFEL with a long, tapered undulator line. For the present analysis, we consider a high average power EUV RAFEL at 13.5 nm and show that the performance exceeds that of single-pass, tapered self-amplified spontaneous emission. This points the way to high power tapered undulator x-ray RAFELs.