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Title: Fast modeling of regenerative amplifier free-electron lasers

Journal Article · · Physical Review Research
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University and SLAC National Accelerator Laboratory
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  3. Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

High-gain free-electron lasers (FELs) are becoming important light sources at short wavelengths such as the EUV and X-ray regimes. A particularly promising concept is the regenerative amplifier FEL (RAFEL), which can greatly increase the brightness and stability of a single pass device. One of the critical challenges of the x-ray RAFEL is maintaining electron-optical overlap over the relatively large (hundreds of meters) footprint of the system. Numerical modeling of x-ray RAFELs with angular and positional errors is critical for designing stable cavities, as well as to predict signatures of specific misalignment effects. Full-scale simulations of x-ray FELs are incredibly time-consuming, making large-scale parameter searches intractable on reasonable timescales. In this paper, we present a semi-analytical model that allows to investigate realistic scenarios - x-ray cavity without gain ("cold cavity" or x-ray FEL oscillator) and x-ray RAFEL - in the presence of angular/positional errors and electron trajectory oscillation. We especially focus on fast modeling of the FEL process and x-ray optics, while capturing effects pertaining to actual experimental setups at the Linac Coherent Light Source (LCLS) at SLAC. Such a method can be used to explore RAFEL at other wavelengths by suitable replacement of the optics modeling.

Research Organization:
Stanford University and SLAC National Accelerator Laboratory
Sponsoring Organization:
USDOE Office of Science (SC); Stanford Graduate Fellowship (SGF); Robert H. Siemann Fellowship
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2223014
Alternate ID(s):
OSTI ID: 2242532
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Vol. 5; ISSN 2643-1564
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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