We report the design and performance of a time-resolved electron diffraction apparatus capable of producing intense bunches with simultaneously single digit micrometer probe size, long coherence length, and 200 fs rms time resolution. We measure the 5d (peak) beam brightness at the sample location in micro-diffraction mode to be 7×1013 A/m2 rad2. To generate high brightness electron bunches, the system employs high efficiency, low emittance semiconductor photocathodes driven with a wavelength near the photoemission threshold at a repetition rate up to 250 kHz. We characterize spatial, temporal, and reciprocal space resolution of the apparatus. We perform proof-of-principle measurements of ultrafast heating in single crystal Au samples and compare experimental results with simulations that account for the effects of multiple scattering.
Li, W. H., et al. "A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes." Structural Dynamics, vol. 9, no. 2, Mar. 2022. https://doi.org/10.1063/4.0000138
Li, W. H., Duncan, C. J. R., Andorf, M. B., Bartnik, A. C., Bianco, E., Cultrera, L., Galdi, A., Gordon, M., Kaemingk, M., Pennington, C. A., Kourkoutis, L. F., Bazarov, I. V., & Maxson, J. M. (2022). A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes. Structural Dynamics, 9(2). https://doi.org/10.1063/4.0000138
Li, W. H., Duncan, C. J. R., Andorf, M. B., et al., "A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes," Structural Dynamics 9, no. 2 (2022), https://doi.org/10.1063/4.0000138
@article{osti_2565022,
author = {Li, W. H. and Duncan, C. J. R. and Andorf, M. B. and Bartnik, A. C. and Bianco, E. and Cultrera, L. and Galdi, A. and Gordon, M. and Kaemingk, M. and Pennington, C. A. and others},
title = {A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes},
annote = {We report the design and performance of a time-resolved electron diffraction apparatus capable of producing intense bunches with simultaneously single digit micrometer probe size, long coherence length, and 200 fs rms time resolution. We measure the 5d (peak) beam brightness at the sample location in micro-diffraction mode to be 7×1013 A/m2 rad2. To generate high brightness electron bunches, the system employs high efficiency, low emittance semiconductor photocathodes driven with a wavelength near the photoemission threshold at a repetition rate up to 250 kHz. We characterize spatial, temporal, and reciprocal space resolution of the apparatus. We perform proof-of-principle measurements of ultrafast heating in single crystal Au samples and compare experimental results with simulations that account for the effects of multiple scattering.},
doi = {10.1063/4.0000138},
url = {https://www.osti.gov/biblio/2565022},
journal = {Structural Dynamics},
issn = {ISSN 2329-7778},
number = {2},
volume = {9},
place = {United States},
publisher = {American Institute of Physics},
year = {2022},
month = {03}}
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Musumeci, P.; Giner Navarro, J.; Rosenzweig, J. B.
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