تقرير
A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes
| العنوان: | A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes |
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| المؤلفون: | 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. |
| سنة النشر: | 2021 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Accelerator Physics |
| الوصف: | We report the design and performance of a time-resolved electron diffraction apparatus capable of producing intense bunches with simultaneously single digit micron 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 $7 \times 10^{13} \ \mathrm{A}/\text{m}^2\text{-rad}^2$. 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. Comment: 13 pages, 10 figures, submitted to Structural Dynamics |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/4.0000138 |
| URL الوصول: | http://arxiv.org/abs/2111.07922 |
| رقم الأكسشن: | edsarx.2111.07922 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/4.0000138 |
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