SMuK 2023 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 8: Advanced IT Tools

AKBP 8.1: Vortrag

Mittwoch, 22. März 2023, 15:45–16:00, CHE/0183

Image space reconstruction algorithm for LPS tomography at PITZ — •Namra Aftab¹, Prach Boonpornprasert¹, Georgi Georgiev¹, Matthias Gross¹, Andreas Hoffmann¹, Mikhail Krasilnikov¹, Xiangkun Li¹, Anne Oppelt¹, Christopher Richard¹, Frank Stephan¹, Grygorii Vashchenko¹, Wolfgang Hillert², and Andrew Reader³ — ¹Deutsches Elektronen-Synchrotron, Zeuthen, Germany — ²University of Hamburg, Institute for Experimental Physics, Hamburg, Germany — ³School of Biomedical Engineering and Imaging Sciences, Kings College London, UK

At the Photo Injector Test facility at DESY in Zeuthen, longitudinal phase space (LPS) before the booster is determined by an iterative reconstruction method called Algebraic Reconstruction Technique (ART). Although ART is simple to implement with good convergence speed, the results show many artefacts and overestimate energy spread and bunch length. Recently LPS tomography was done via Image Space Reconstruction Algorithm (ISRA) which showed promising results owing to its assurance of non-negative solution. The weight matrix crucial for successive updates was improved by bilinear interpolation. The initial guess for iterations was established from low energy section momentum measurements. The aforementioned reforms resulted in reduced noise-like artefacts, better convergence speed and accurate longitudinal emittance. ISRA was tested on simulations as well as on experimental data. It can diagnose not only linear chirp in LPS but also higher order effects. Experiments with modulated laser beams were also designed to demonstrate the diagnostic capability.