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Persistent URL http://purl.org/net/epubs/work/50543467
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Record Id 50543467
Title Controlled degradation by oxygen exposure in the performance of a Ag(100) single-crystal photocathode
Abstract The search for high performance photocathode electron sources is a priority in the accelerator science community. The surface characteristics of a photocathode define many important factors of the photoemission including the work function, intrinsic emittance and quantum efficiency of the photocathode. These factors in turn define the electron beam performance which is measurable as normalised emittance, brightness and energy spread. Strategies for improving these parameters vary, but understanding and influencing the relevant cathode surface physics which underpin these attributes is a primary focus for the electron source community. As such, pure metal photocathodes and their performance at UV wavelengths are of interest as seen at the LCLS at SLAC and CLARA at Daresbury. We present performance data for a Ag (100) single-crystal photocathode under illumination at 266 nm wave-length, with known levels of surface roughness, using our Transverse Energy Spread Spectrometer (TESS) both at room and cryogenic temperatures. Crucially our data shows the effect of progressive degradation in the photo-cathode performance as a consequence of exposure to controlled levels of oxygen.
Organisation ASTeC , ASTeC-AP , STFC
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Language English (EN)
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Paper In Conference Proceedings In 12th International Particle Accelerator Conference (IPAC2021), Campinas, Brazil, 24-28 May 2021, (2021). https://accelconf…/wepab111_poster.pdf 2021