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TY - CONF AU - Andrews, H.L. AU - Choi, B.K. AU - Fleming, R.L. AU - Kim, D. AU - Lewellen, J.W. AU - Nichols, K.E. AU - Shchegolkov, D.Y. AU - Simakov, E.I. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - An Investigation of Electron Beam Divergence from a Single DFEA Emitter Tip 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 - Diamond Field-Emitter Array (DFEA) cathodes are arrays of micron-scale diamond pyramids with nanometer-scale tips. DFEAs can produce high emission currents with small emittance and energy spread. At LANL, we have an ongoing program to test DFEA cathodes for the purpose of using them to generate high-current, low-emittance electron beams for dielectric laser accelerators. We have recently upgraded our cathode test chamber to use a mesh anode in place of a solid luminescent anode. In addition to allowing for downstream beam transport, this arrangement may eliminate earlier problems with reduced cathode performance due to ion back-bombardment. We are measuring divergence of the electron beam past the mesh in an effort to characterize the inherent beam divergence off the diamond tip and divergence contribution from the mesh. We will compare these observations with theoretical and modeled values. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4662 EP - 4664 KW - cathode KW - experiment KW - electron KW - laser KW - emittance DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPML007 UR - http://jacow.org/ipac2018/papers/thpml007.pdf ER -