SRF2025 - 22nd International Conference on RF Superconductivity

Studies of in-situ baking of SRF niobium cavities without a furnace at HZB

TUA04

23 Sept 2025, 09:30

20m

Ito International Research Center

Board: TUA04

Invited Oral Presentation MC2: Fundamental SRF research and development Tuesday Oral Session: A

Speaker

Alena Prudnikava (Helmholtz-Zentrum Berlin für Materialien und Energie)

Description

A specialized setup was designed to carry on a mid-T baking of SRF niobium cavities. It utilizes resistive heaters installed on the outer cavity walls, with a cryostat serving as a vacuum vessel. Based on our material studies with the real-time in-situ synchrotron XPS, a single-cell 1.3 GHz cavity was thermally treated in the regime providing contamination-free oxygen doping of niobium. RF tests of the cavity showed a significant reduction in surface resistance, primarily due to a decrease in residual resistance, with no field emission or degradation of the maximum accelerating field. This developed procedure can be potentially applied to bake “dressed” cavities prior to cryomodule assembly without breaking the cavity vacuum, thereby preventing surface re-oxidation and allowing the full benefits of mid-T baking to be realized in a real accelerator environment.