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@inproceedings{soomary:ipac2021-wepab111,
author = {L.A.J. Soomary and L.B. Jones and T.C.Q. Noakes and C.P. Welsch},
title = {{Controlled Degradation by Oxygen Exposure in the Performance of a Ag (100) Single-Crystal Photocathode}},
booktitle = {Proc. IPAC'21},
pages = {2856--2859},
eid = {WEPAB111},
language = {english},
keywords = {cathode, experiment, electron, cryogenics, emittance},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-WEPAB111},
url = {https://jacow.org/ipac2021/papers/wepab111.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-WEPAB111},
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 normalized 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 an Ag (100) single-crystal photocathode under illumination at 266 nm wavelength, 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.}},
}