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TY - CONF AU - Smedley, J. AU - Attenkofer, K. AU - Bhandari, H. AU - Ding, Z. AU - Frisch, H.J. AU - Gaowei, M. AU - Muller, E.M. AU - Padmore, H.A. AU - Schubert, S.G. AU - Sinsheimer, J. AU - Walsh, J. AU - Wong, J.J. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Sputter Growth of Alkali Antimonide Photocathodes: An in Operando Materials Analysis J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - Alkali antimonide photocathodes are a strong contender for the cathode of choice for next-generation photon sources such as LCLS II or the XFEL. These materials have already found extensive use in photodetectors and image intensifiers. However, only recently have modern synchrotron techniques enabled a systematic study of the formation chemistry of these materials. Such analysis has led to the understanding that these materials are inherently rough when grown through traditional sequential deposition; this roughness has a detrimental impact on the intrinsic emittance of the emitted beam. Sputter deposition may provide a path to achieving a far smoother photocathode, while maintaining adequate quantum efficiency. We report on the creation and vacuum transport of a K2CsSb sputter target, and its use to create an ultra-smooth (sub nm roughness) cathode with a 2% quantum efficiency at 532 nm. PB - JACoW CP - Geneva, Switzerland SP - 1965 EP - 1967 KW - cathode KW - target KW - emittance KW - gun KW - radiation DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-TUPHA003 UR - http://jacow.org/ipac2015/papers/tupha003.pdf ER -