Speaker
Description
In recent years, there has been interest in developing compact x-ray light sources that are significantly smaller and cheaper to build than a conventional XFEL or synchrotron facility. As part of this effort, the compact x-ray light source (CXLS) at Arizona State University is an x-ray source based on Inverse Compton Scattering that produces 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. In this case, producing the electron beam using single photon photoemission with an ultraviolet (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 and a charge density of 700 pC/mm^2. Furthermore, we 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 into the design, which can be used to reduce the electron beam emittance further through adaptive shaping of the laser profile, with the goal of correcting for a spatially inhomogeneous cathode emission and producing a uniform ellipsoid of charge.
Funding Agency
This material is based upon work supported by the National Science Foundation under Grant Nos. 2153503 and 1935994.
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