Abstract
We report on first operation of the shortest wavelength free electron lasers driven by a linear accelerator with a thermionic gun. We have proved that a medium-emittance (26 πmm mrad), medium-current (60A) but 24-μs pulse 155-MeV electron beam allows free electron laser (FEL) oscillations at 0.287-0.37 μm. The peak and average FEL powers are 1.8 MW and 4 mW at 0.35 μm. Tunable wavelength range depends on characteristic optical loss of used multilayer mirrors and agrees with gain simulations. Our results provide the confidence to proceed with shorter wavelength FEL projects using a low-emittance (πmm mrad), high-current (> 100 A) beam from a high-energy linac with a photocathode.
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