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TY - CONF AU - Fleming, R.L. AU - Andrews, H.L. AU - Gorelov, D. AU - Huang, C.-K. AU - Kim, D. AU - Lewellen, J.W. AU - Nichols, K.E. AU - Pavlenko, V.N. AU - Simakov, E.I. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Focusing Studies of an Electron Beam in Diamond Field Emitter Array Cathodes 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 - We present the simulations and test results for focusing studies performed on diamond field emitter array cathodes. This design utilized a simple variable-focus solenoidal lens in conjunction with a scanning wire technique in order to measure the beam spot size. The spot size was measured by scanning a thin copper wire across the beam in 1 µm increments, with voltage being measured and averaged at each location in order to map the location and intensity of the beam. Scans were taken at different distances away from the magnetic center of the lens, and show good agreement with our simulations of the beam. Ultimately this has allowed us to focus the beam to a spot size of 5.72 µm with an average current of 15.78 µA. PB - JACoW Publishing CP - Geneva, Switzerland SP - 217 EP - 219 KW - cathode KW - electron KW - experiment KW - focusing KW - laser DA - 2019/10 PY - 2019 SN - 2673-7000 SN - 978-3-95450-223-3 DO - doi:10.18429/JACoW-NAPAC2019-MOPLH22 UR - http://jacow.org/napac2019/papers/moplh22.pdf ER -