Dresden 2014 – wissenschaftliches Programm

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BE: Beschleunigerphysik

BE 11: Accelerator Physics Poster Session

BE 11.14: Poster

Mittwoch, 2. April 2014, 17:00–19:30, P4

Quantification of Geometric Uncertainties in Single-Cell Cavities for BESSY VSR using Monte-Carlo Simulation — •Johann Heller, Thomas Flisgen, Christian Schmidt, and Ursula van Rienen — Institute for General Electrical Engineering, University of Rostock, Germany

The electromagnetic properties of SRF cavities are mostly determined by their shape. Due to fabrication tolerances, tuning and limited resolution of measurement systems, the exact shape remains uncertain. In order to make assessments for the real life behaviour it is important to quantify how these geometrical uncertainties propagate through the mathematical system and influence certain electromagnetic properties, like the resonant frequencies of the structure's eigenmodes. Since the deterministic problem is relatively fast to compute, this can be done by using non-intrusive straightforward methods like Monte-Carlo (MC) simulations. Using this technique we investigate the propagation of geometric uncertainties on a single cell cavity from BESSY VSR regarding certain RF properties. In the future we plan on the application of the gained knowledge on a higher order mode beam position monitoring system as well as using different techniques for uncertainty quantification like polynomial chaos expansion in order to reduce the computational time.