29 November 1993 Operational experience with a free-electron laser driven by an rf photoinjector linac
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For a number of years Los Alamos National Laboratory has been developing photocathode sources of high-brightness electron beams for FEL applications. The APEX FEL, which has been operational for over two years, was the first FEL to use a custom designed rf photoinjector as its electron source. The system consists of a 1.3 GHz, 6 MeV photoinjector with a multi-alkali photocathode illuminated by a frequency doubled Nd:YLF drive-laser, followed by three separately powered accelerating structures that give a final electron energy of 40-MeV. The FEL has operated as an oscillator with either a permanent magnet or pulsed electromagnetic wigglers. Originally the FEL was designed to operate at a wavelength near 3 micrometers , however the electron beam emittance and brightness are sufficient for harmonic lasing at much shorter wavelengths. We have demonstrated the tunability of the device from 0.37 to 11 micrometers .
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Patrick G. O'Shea et al., Patrick G. O'Shea et al., } "Operational experience with a free-electron laser driven by an rf photoinjector linac", Proc. SPIE 2013, Electron-Beam Sources of High-Brightness Radiation, (29 November 1993); doi: 10.1117/12.164794; https://doi.org/10.1117/12.164794

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