A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2021
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866909226380558336 |
|---|---|
| author | 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. |
| author_facet | 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. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2111_07922 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes 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. Accelerator Physics 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. |
| title | A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2111.07922 |