# Darmstadt 2016 – wissenschaftliches Programm

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# AKBP: Arbeitskreis Beschleunigerphysik

## AKBP 4: RF, Resonators and Applications II

### AKBP 4.6: Vortrag

### Montag, 14. März 2016, 17:45–18:00, S1/05 24

**Numerical Investigation of External Losses for Superconducting Radio-Frequency Resonators** — •Johann Heller, Thomas Flisgen, Tomasz Galek, and Ursula van Rienen — Institute for General Electrical Engineering, Rostock

For the thorough design of particle accelerators, the electromagnetic behavior of the accelerating resonators has to be investigated. Of special interest are the losses inside the resonators which have to be optimized such that the operation costs stay as moderate as possible and the quality of the particle beam is not diminished. In superconducting radio-frequency (SRF) cavities, the losses are dominated by energy leaving the structure through the open waveguide ports. Generally, the numerical discretization of such problems lead to large scale, non-linear, complex eigenvalue problems which are extremely hard to solve. Therefore, a standard approach is to introduce some simplifications (e.g. linearization), that allow for the fast computation of such losses. In this talk, we present an algorithm, that allows for the solution of the full non-linear eigenvalue problem by applying some model-order reduction. The usability of the approach for large-scale, real-life applications is shown on parts of the Third-Harmonic Module of the FLASH accelerator in Hamburg.