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TY - CONF AU - Li, W.H. AU - Andorf, M.B. AU - Bazarov, I.V. AU - Cultrera, L. AU - Duncan, C.J.R. AU - Galdi, A. AU - Maxson, J.M. AU - Pennington, C.A. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Ultrafast Nonlinear Photoemission from Alkali Antimonide 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 - Alkali antimonides photocathodes are a popular choice of electron source for high average brightness beams, due to their high quantum efficiency (QE) and low mean transverse energy (MTE). This paper describes the first measurements of their nonlinear photoemission properties under sub-ps laser illumination. These measurements include wavelength-resolved power dependence, pulse length dependence, and temporal response. The transition between linear and nonlinear photoemission is observed through the wavelength-resolved scan, and implications of nonlinear photoemission are discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 203 EP - 206 KW - photon KW - electron KW - cathode KW - laser KW - gun DA - 2019/10 PY - 2019 SN - 2673-7000 SN - 978-3-95450-223-3 DO - doi:10.18429/JACoW-NAPAC2019-MOPLH14 UR - http://jacow.org/napac2019/papers/moplh14.pdf ER -