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TY - CONF AU - Malin, L.E. AU - Graves, W.S. AU - Li, R.K. AU - Nanni, E.A. AU - Shen, X. AU - Spence, J. AU - Weathersby, S.P. AU - Weiss, K. AU - Yang, J. AU - Zhang, C. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Experiments Producing Nanopatterned Electron Beams 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 - RF photoinjectors are increasingly used to image at the nanoscale in much the same way as a Transmission Electron Microscope (TEM), which are generally sub-MeV energy. We have conducted electron diffraction experiments through a thin membrane of single crystal silicon using both the TEM and photoinjector, and have been able to model and predict the diffraction patterns using the multislice method. A nanopatterned single crystal silicon grating was also imaged in the TEM in the bright field, where all but the direct beam of the diffraction pattern is blocked, giving high contrast spatial modulations corresponding to the 400 nm pitch grating lithographically etched into the silicon. Drawing from our previous multislice calculations, we determined the crystallographic orientation that maximized the contrast in this spatial modulation at the energy of the TEM, giving a bunching factor comparable to a saturated FEL. We report on these key steps toward control of radiation phase and temporal coherence in an FEL. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1553 EP - 1555 KW - electron KW - FEL KW - bunching KW - experiment KW - emittance DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-TUPML011 UR - http://jacow.org/ipac2018/papers/tupml011.pdf ER -