IPAC2018 - List of Authors (Spence, J.)

Paper	Title	Page
TUPML011	Experiments Producing Nanopatterned Electron Beams	1553
	L.E. Malin, W.S. Graves, J. Spence, K. Weiss, C. Zhang Arizona State University, Tempe, USA R.K. Li, E.A. Nanni, X. Shen, S.P. Weathersby, J. Yang SLAC, Menlo Park, California, USA
	Funding: Work supported by NSF awards 1632780 and 1231306, DOE award DE-AC02-76SF00515, and the SLAC UED/UEM Initiative Program Development Fund. 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML011
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Paper

Title

Page

Experiments Producing Nanopatterned Electron Beams

1553

L.E. Malin, W.S. Graves, J. Spence, K. Weiss, C. Zhang
Arizona State University, Tempe, USA
R.K. Li, E.A. Nanni, X. Shen, S.P. Weathersby, J. Yang
SLAC, Menlo Park, California, USA

Funding: Work supported by NSF awards 1632780 and 1231306, DOE award DE-AC02-76SF00515, and the SLAC UED/UEM Initiative Program Development Fund.
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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML011

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)