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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 18: Beam Dynamics II

AKBP 18.2: Talk

Thursday, March 23, 2023, 17:45–18:00, CHE/0184

Measurement of emittance and spatial coherence for low intensity electron beams — •Benat Alberdi-Esuain — Helmholtz-Zentrum Berlin, 12489 Berlin — Humboldt-Universität zu Berlin, 12489 Berlin

The SRF-Photoinjector is a superconducting linear electron accelerator currently being commissioned in Helmholtz-Zentrum Berlin. It is able to provide a very broad range of beam parameters, which enables applications of the injector that go beyond its original operation purpose as an ERL technology demonstrator. The ultra-short bunch length, high repetition rate and low achievable emittances make the SRF Photoinjector an ideal candidate for Ultrafast Electron Diffraction (UED) and direct imaging experiments with the aim of imaging biological molecules in gas or liquid solutions. The first stage of the development of UED capabilities in HZB consists of a static UED experiment to prove that the spatial resolution required for UED experiments can be achieved. To monitor the performance of the experiment the diagnostics of transverse beam parameters is necessary, which is challenging to do with traditional techniques given the small emittances and low bunch charges. In this work we present the results of the measurement of transverse normalized emittance and spatial coherence length with appropriate methods for UED experimental conditions. The experiments were carried out at the UED user facility in KAERI, in South Korea, with the goal of developing the capabilities for beam monitoring for when the SRF Photoinjector in HZB becomes operational.