S. Joly et al., PROGRESS REPORT ON THE ELSA FEL AND 1ST LASING, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 331(1-3), 1993, pp. 199-203
The ELSA free-electron laser has delivered its first FEL photons at a
wavelength of about 23 mum. Electron bunches were produced by a 144 MH
z photoinjector, accelerated to 16.5 MeV by a 433 MHz linac and transp
orted through a three-dipole U-turn into a 3.2 cm period hybrid undula
tor.