Dortmund 2021 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 7: Electron Accelerators
AKBP 7.9: Vortrag
Mittwoch, 17. März 2021, 16:00–16:15, AKBPb
High brightness beam from a photoinjector for ultra-fast scattering experiments. — •Beñat Alberdi Esuain1,2, Axel Neumann1, Jens Voelker1, and Thorsten Kamps1,2 — 1Helmholtz-Zentrum Berlin — 2Humboldt University of Berlin
Ultrafast Electron Diffraction (UED) is a pump-probe technique used to observe dynamical changes in the structure of materials. A laser pulse excites the target structure and a subsequent electron bunch scatters in the sample producing a diffraction pattern. The time resolution of UED experiments is governed by the bunch length, while the spatial resolving power is related to the transverse phase space. Hence, high brilliance electron beams are needed. The SRF Photoinjector test facility is a high current electron source at Helmholtz-Zentrum Berlin (HZB). It offers unique possibilities to perform UED experiments as the design is flexible enough to realize the strict electron beam requirements. Two phases are foreseen to achieve operational UED capabilities. The first phase is a proof of concept experiment with a static target to prove that it is possible to attain the required beam parameters. The second phase will have the objective of implementing the time-resolved pump-probe scheme. Phase 1 is currently being developed and is the main focus of this talk. In order to accomplish the high brilliance beam, the longitudinal phase space is linearized at the target by three booster cavities, while the desired transverse phase space is achieved by using an aperture and focusing elements. We discuss the requirements for such experiment, the work that has been carried out for the first phase and the outlook of the UED project in HZB.