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TY - CONF AU - Dimitrov, D.A. AU - Bell, G.I. AU - Ben-Zvi, I. AU - Feng, J. AU - Karkare, S.S. AU - Padmore, H.A. AU - Smedley, J. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Modeling Surface Roughness Effects and Emission Properties of Bulk and Layered Metallic Photocathode J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The thermal limit of the intrinsic emittance of photocathodes represents an important property to measure experimentally and to understand theoretically. Detailed measurements of intrinsic emittance have become possible in momentatron experiments. Moreover, recent developments in material design have allowed growing photoemissive layers with controlled surface roughness. Although analytical formulations of the effects of roughness have been developed, a full theoretical model and experimental verification are lacking. We aim to bridge this gap by developing realistic models for different materials in the three-dimensional VSim particle-in-cell code. We have recently implemented modeling of electron photo-excitation, transport, and emission from photoemissive layers grown on a substrate. We report results from simulations with these models on electron emission from antimony and gold. We consider effects due to density of states, photoemissive layer thickness, surface roughness and how they affect the spectral response of quantum yield and intrinsic emittance. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3515 EP - 3517 KW - simulation KW - electron KW - emittance KW - experiment KW - cathode DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPAK116 UR - http://jacow.org/ipac2018/papers/thpak116.pdf ER -