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Akademický článek

A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes

Autor: W. H. Li, C. J. R. Duncan, M. B. Andorf, A. C. Bartnik, E. Bianco, L. Cultrera, A. Galdi, M. Gordon, M. Kaemingk, C. A. Pennington, L. F. Kourkoutis, I. V. Bazarov, J. M. Maxson

Publikováno v: Structural Dynamics, Vol 9, Iss 2, Pp 024302-024302-11 (2022)

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

Externí odkaz: https://doaj.org/article/6ac30e80a69740f683ef3067f15bdcb4

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Akademický článek

Four-dimensional emittance measurements of ultrafast electron diffraction optics corrected up to sextupole order

Autor: M. Gordon, W. H. Li, M. B. Andorf, A. C. Bartnik, C. J. R. Duncan, M. Kaemingk, C. A. Pennington, I. V. Bazarov, Y.-K. Kim, J. M. Maxson

Publikováno v: Physical Review Accelerators and Beams, Vol 25, Iss 8, p 084001 (2022)

Ultrafast electron diffraction (UED) is a technique in which short-pulse electron beams can probe the femtosecond-scale evolution of atomic structure in matter driven far from equilibrium. As an accelerator physics challenge, UED imposes stringent co

Externí odkaz: https://doaj.org/article/47b5cff10e634d19b1a0f1b42b855f64

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Akademický článek

Online storage ring optimization using dimension-reduction and genetic algorithms

Autor: W. F. Bergan, I. V. Bazarov, C. J. R. Duncan, D. B. Liarte, D. L. Rubin, J. P. Sethna

Publikováno v: Physical Review Accelerators and Beams, Vol 22, Iss 5, p 054601 (2019)

Particle storage rings are a rich application domain for online optimization algorithms. The Cornell Electron Storage Ring (CESR) has hundreds of independently powered magnets, making it a high-dimensional test-problem for algorithmic tuning. We inve

Externí odkaz: https://doaj.org/article/02ef27de77b6478fae25b253ade5e500

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Akademický článek

Metal–biomass interactions: a comparison of visualisation techniques available in South Africa

Autor: B. A. Moore, C. Mack, J. R. Duncan, J. E. Burgess

Publikováno v: South African Journal of Science, Vol 105, Iss 3/4 (2010)

The interaction of metals and biological materials is of interest for reasons such as metal recovery, toxicity and production of high-value products such as gold and platinum nanoparticles. Understanding the way in which metals interact with the biom

Externí odkaz: https://doaj.org/article/ff5e3a26fca64488934d2a958de5387e

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