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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 12: AKBP Poster Session

AKBP 12.15: Poster

Donnerstag, 21. März 2024, 11:00–14:00, Poster A

Coupled S-parameter modelling of the beam impedance of elliptical undulators — •Alistair Muir¹, Paul Volz³, Frederik Quetscher², Atoosa Meseck³, Erion Gjonaj², and Ursula van Rienen¹ — ¹Universität Rostock, Rostock, Germany — ²TU Darmstadt, Darmstadt, Germany — ³Helmholtz-Zentrum Berlin, Berlin, Germany

Undulators are long and complex structures used in electron accelerators to generate X-rays. They are central components of a free electron laser. Such structures can generate strong wakefields that affect the beam impedance and create heat loads. Current software cannot efficiently model the beam impedance for long, complex structures on modest computing resources. We use the CSC_Beam method, based on Coupled S-Parameter Calculation (CSC), to model the beam impedance of arbitrarily long structures efficiently. It involves dividing the beam path into sections, forming a matrix containing the S-parameters and the direct beam impedance for each section, and concatenating the matrices of all the sections using CSC. We apply this method to model the beam impedance through the entrance section of an elliptical undulator. We compare with direct simulation results and evaluate the relative computational efficiency of the method.

Keywords: Coupled S-Parameter Calculation; Beam impedance; undulators; domain decomposition methods; computational efficiency