TY - GEN
T1 - Comparison of theory, simulation, and experiment for dynamical extinction of relativistic electron beams diffracted through a SI crystal membrane
AU - Malin, L. E.
AU - Graves, W. S.
AU - Spence, J. C.H.
AU - Zhang, C.
AU - Li, R.
AU - Limborg, C.
AU - Nanni, E. A.
AU - Shen, X.
AU - Weathersby, S.
N1 - Funding Information:
We thank Pierre Stadelmann for supplying a relativistic version of JEMS and for valuable discussion. We gratefully acknowledge financial support from NSF awards 1632780 and 1231306, the BioXFEL Science and Technology Center, U.S. DOE Contract No. DE-AC02-76SF00515, and the SLAC UED/UEM Initiative Program Development Fund. Travel support to IPAC’17 was provided by the NSF Division of Physics (Accelerator Science Program) and the Division of Beam Physics of the American Physical Society.
Funding Information:
∗ Work supported by NSF awards 1632780 and 1231306, DOE award DE-AC02-76SF00515, and the SLAC UED/UEM Initiative Program Development Fund. † lemalin@asu.edu
Publisher Copyright:
© 2017 CC-BY-3.0 and by the respective authors
PY - 2017/7
Y1 - 2017/7
N2 - Diffraction in the transmission geometry through a single-crystal silicon slab is exploited to control the intensity of a relativistic electron beam. The choice of crystal thickness and incidence angle can extinguish or maximize the transmitted beam intensity via coherent multiple Bragg scattering; thus, the crystal acts as a dynamical beam stop through the Pendelösung effect, a well-known phenomenon in X-ray and electron diffraction. In an initial experiment, we have measured the ability of this method to transmit or extinguish the primary beam and diffract into a single Bragg peak. Using lithographic etching of patterns in the crystal we intend to use this method to nanopattern an electron beam for production of coherent x-rays. We compare the experimental results with simulations using the multislice method to model the diffraction pattern from a perfect silicon crystal of uniform thickness, considering multiple scattering, crystallographic orientation, temperature effects, and partial coherence from the momentum spread of the beam. The simulations are compared to data collected at the ASTA UED facility at SLAC for a 340 nm thick Si(100) wafer with a beam energy of 2.35 MeV.
AB - Diffraction in the transmission geometry through a single-crystal silicon slab is exploited to control the intensity of a relativistic electron beam. The choice of crystal thickness and incidence angle can extinguish or maximize the transmitted beam intensity via coherent multiple Bragg scattering; thus, the crystal acts as a dynamical beam stop through the Pendelösung effect, a well-known phenomenon in X-ray and electron diffraction. In an initial experiment, we have measured the ability of this method to transmit or extinguish the primary beam and diffract into a single Bragg peak. Using lithographic etching of patterns in the crystal we intend to use this method to nanopattern an electron beam for production of coherent x-rays. We compare the experimental results with simulations using the multislice method to model the diffraction pattern from a perfect silicon crystal of uniform thickness, considering multiple scattering, crystallographic orientation, temperature effects, and partial coherence from the momentum spread of the beam. The simulations are compared to data collected at the ASTA UED facility at SLAC for a 340 nm thick Si(100) wafer with a beam energy of 2.35 MeV.
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M3 - Conference contribution
AN - SCOPUS:85056908413
T3 - IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference
SP - 3924
EP - 3927
BT - IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference
PB - Joint Accelerator Conferences Website - JACoW
T2 - 8th International Particle Accelerator Conference, IPAC 2017
Y2 - 14 May 2017 through 19 May 2017
ER -