Speaker
Description
Recent years have seen a growing interest in developing x-ray sources that are cheaper and more compact than conventional XFELs and synchrotrons. The Compact X-ray Light Source (CXLS) at Arizona State University achieves this using Inverse Compton scattering to produce a high-brightness, short pulse duration x-ray beam. This source operates in blowout mode, meaning a high-charge, short-bunch length electron beam self compresses into a uniform ellipsoid in phase space after emission from the cathode. Seeding this electron beam via single photon photoemission with a UV laser presents many technical challenges due to a lack of optical materials that can withstand the high intensity UV light for a long period of time. For this reason, we implemented a photoinjector scheme that uses multiphoton emission with a 515 nm femtosecond laser. Using this design, we have been able to achieve a bunch charge of 200 pC, a charge density of 700 pC/mm^2, and have measured a transverse emittance of 0.95 mm mrad and a bunch length of 750 fs downstream. Ongoing work is aimed at integrating a spatial light modulator to further reduce the electron beam emittance by adaptively shaping the laser profile.
Funding Agency
This material is based upon work supported by the National Science Foundation under Grant Nos. 2153503 and 1935994.
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