Characterization of high harmonic beam generated in a gas-filled capillary for seeding of free-electron lasers
Siew Jean Goh (Speaker), Yin Tao (Contributor), Bastiaens, B. (Contributor), van der Slot, P. (Contributor), Herek, J. (Contributor), Sandra Biedron (Contributor), Steve Milton (Contributor), Miltcho Danailov (Contributor), Boller, K. (Contributor)
Activity: Talk or presentation › Oral presentation
We study the beam characteristics of a gas filled capillary based high harmonic source for seeding of the free-electron laser FERMI@Elettra. The stability requirements for seeding include pointing stability, divergence and energy jitter. These parameters are important due to the large distance between the source and the undulator where the seed needs to overlap with the electron beam of the free-electron laser. Here, we investigate the influence of the gas pressure and drive laser energy on the high harmonic generation in an Argon-filled capillary, driven by a Ti:Sapphire laser with 45 fs pulses. We report on the optimization of the harmonic yield as well as the properties of the harmonic beam, and compare our experimental results with the requirements of the FERMI@Elettra laser. To scale up the yield further, the build-up of a new high harmonic source with larger capillary diameter, suited for higher drive laser energy, is currently in progress.