Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 129: Beschleunigerphysik XVI (Poster)

T 129.27: Poster

Mittwoch, 6. März 2013, 16:45–19:00, HSZ 1.OG

Higher Order Modes in Superconducting Radio Frequency Resonators for Energy Recovery Linacs — •Tomasz Galek and Ursula van Rienen — Universität Rostock, Institut Allgemeine Elektrotechnik, Albert-Einstein-Str. 2, 18051 Rostock, Germany

The main scope of this work is the automation of the extraction procedure of the external quality factors of Higher Order Modes (HOMs) in Superconducting Radio Frequency (SRF) cavities. The HOMs are generated by charged particle beams traveling through a SRF cavity at the speed of light. The HOMs decay very slowly, depending on localization inside the structure and cell-to-cell coupling, and may influence succeeding charged particle bunches. Thus it is important, at the SRF cavity design optimization stage, to calculate the external quality factors (Qext) of HOMs. Traveling Poles Elimination (TPE) scheme was used to automatically extract Qext from the transmission spectra and careful eigenmode analysis of the SC cavity was performed to confirm TPE results. The eigenmode analysis also delivers important information about band structure, cell-to-cell coupling of HOMs and allows rapid identification of modes that could interact with the charged particle bunches.