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TY - CONF AU - Chen, G. AU - Adhikari, G. AU - Antipov, S.P. AU - Baryshev, S.V. AU - Gomez, E. AU - Nikhar, T. AU - Schroeder, W.A. AU - Spentzouris, L.K. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Study of the Mean Transverse Energy and the Emission Mechanism of (N)UNCD Photocathodes J2 - Proc. of NAPAC2019, Lansing, MI, USA, 01-06 September 2019 CY - Lansing, MI, USA T2 - North American Particle Accelerator Conference T3 - 4 LA - english AB - Nitrogen incorporated ultrananocrystalline diamond ((N)UNCD) is promising for photocathode applications due to its high quantum efficiency (QE). The mean transverse energy (MTE) which, along with QE, defines the brightness of the emitted electron beam must be thoroughly characterized and understood for (N)UNCD. Our previous work* further corroborated the important role of graphitic grain boundaries (GB’s). UNCD consists of diamond (sp3-hybrized) grains and graphitic (sp2-hybrized) GB’s: GB’s are behind the high emissivity of (N)UNCD and therefore play a crucial role in defining and controlling the MTE. In this work, the MTE of two different (N)UNCD samples having different ratios of sp3/sp2 were measured versus the primary photon energies. As a reference, MTE of highly oriented pyrolytic graphite (HOPG, canonical sp2-hybrized graphite) was also measured. PB - JACoW Publishing CP - Geneva, Switzerland SP - 181 EP - 183 KW - cathode KW - electron KW - photon KW - experiment KW - emittance DA - 2019/10 PY - 2019 SN - 2673-7000 SN - 978-3-95450-223-3 DO - doi:10.18429/JACoW-NAPAC2019-MOPLH06 UR - http://jacow.org/napac2019/papers/moplh06.pdf ER -