Abstract
Using an arrival timing measurement system based on the EO (Electro-Optic) sampling technique, we improved a hit rate of seeded FEL (Free Electron Laser) pulse, which satisfies the spatio-temporal overlap between the seeding HHG (Higher-order Harmonic Generation) pulse and the electron bunch, at the SCSS test accelerator. HHG -seeded FEL was operated over half a day with a 20–30 % effective hit rate. The output pulse energy was 20 µJ at a wavelength of 61.2 nm.
© 2014 Optical Society of America
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