SKM 2023 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 42: Poster: Nanostructures at Surfaces
O 42.10: Poster
Tuesday, March 28, 2023, 18:00–20:00, P2/EG
XRR Analysis of Al2O3 coated and mid-T baked niobium for future implementation in SIS-based SRF cavities — •Artem Zaidman1, 2, Getnet Kacha Deyu2, Marc Wenskat2, Vedran Vonk1, Robert Zierold3, Robert Blick3, 4, Wolfgang Hillert2, and Andreas Stierle1,2 — 1Deutsches Elektronen-SynchrDeutsches Elektronen-Synchrotron DESY, Germany — 2Institute of Experimental Physics, Universität Hamburg, Germany — 3Center for Hybrid Nanostructures (CHyN), Universität Hamburg, Germany — 4Materials Science and Engineering, University of Wisconsin-Madison, United States
Bulk niobium is currently the most used material for RF surfaces. A new approach proposed by Gurevich [1] suggests the use of a superconductor-insulator-superconductor structure (SIS) to achieve higher accelerating fields and reduced surface resistance beyond the thermodynamic limits of Nb. As an intermediate step to pursue this model and in coordination with a similar procedure performed on a single-cell niobium cavity, a mechanically polished two-grain-Nb sample was coated with a 36 nm Al2O3 thin film via thermal atomic layer deposition (ALD) to create an insulating layer and baked for 3h at 300°C (mid-T bake) [2]. An XRR analysis of the sample was taken at each processing step to follow the changes in the niobium native oxide thickness and composition.
[1] A. Gurevich, Appl. Phys. Lett. 88, 012511 (2006) [2] S. Posen, et al., Phys. Rev. Applied 13, 014024 (2020)