SMuK 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: RF and SRF Research

AKBP 11.6: Vortrag

Mittwoch, 22. März 2023, 18:45–19:00, CHE/0184

Influence of High-Pressure Rinsing on the Oxide-Layer Thickness and Oxygen-Concentration of Niobium Samples — •Rezvan Ghanbari¹, Marc Wenskat¹, Mona Kohantorabi², Heshmat Noei², Arti Dangwal Pandey², Detlef Reschke², and Wolfgang Hillert¹ for the University of Hamburg collaboration — ¹Institute of experimental physics, University of Hamburg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Germany

This study is devoted to investigate the effect of High Pressure Rinsing (HPR) on the outcome of annealing procedures of Niobium (Nb) superconducting radio-frequency cavities. Recently, a so-called "mid-T bake" treatment has exhibited very high-quality factors for Nb cavities. The complementary developed models assume that the quality factor severely depends on the oxygen concentration in the near-surface of niobium. On the other hand, based on our observation, we realize that HPR affects the thickness of oxide layers on the surface of niobium cavities, which is the dominant source of the oxygen diffusion during annealing. Thus, we have measured the oxide thicknesses after various HPR durations of Nb samples before and after applying mid-T bake treatment via X-ray Photoelectron Spectroscopy (XPS) and used Secondary Ion Mass Spectrometry (SIMS) to obtain the interstitial oxygen concentration after the annealing. The results of this investigation will be presented and discussed in the context of theoretical models.