Dresden 2026 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 3: Diagnostics

AKBP 3.4: Talk

Monday, March 9, 2026, 15:45–16:00, SCH/A117

Error investigations of longitudinal phase space measurements using tomography — •Marc P. Kerstan, Christopher J. Richard, and Namra Aftab — Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany

The Longitudinal Phase Space (LPS) characterization is important in beam dynamics, especially in Free-Electron Lasers (FELs), where the slice energy spread is a key parameter to evaluate lasing performance and brightness.

The Photo Injector Test facility at DESY in Zeuthen (PITZ) is a test stand to condition and characterize electron sources for EuXFEL and FLASH. Measurement of the LPS directly after the electron source at PITZ is not possible due to unavailability of a dedicated diagnostics setup. Alternatively, the LPS can be measured 2.33 m from the cathode using tomography with the booster cavity as a rotating element. The aim of this project is to better understand the measured reconstructed LPS by refining the simulation model to better represent the measurement process. The current model is simplified. It only consists of a drift space with the correct length and does not include a dispersive element or many of the systematic error sources, that contribute to the real measurement.

Presented here are the results of an updated beamline model including a dipole and transverse focusing elements. This improved model allows for studies of the systematic errors on the reconstructed LPS including noise cuts and measurement camera resolution.

Keywords: Longitudinal Phase Space; Simulation; Tomography