SRF2025 - 22nd International Conference on RF Superconductivity

Experimental demonstration of the slotted waveguide elliptical SWELL cavity for high intensity SRF accelerators

FRB01

26 Sept 2025, 11:00

20m

Ito International Research Center

Board: FRB01

Invited Oral Presentation MC3: Cavities Friday Oral Session: B

Speaker

Franck Peauger (European Organization for Nuclear Research)

Description

In the context of the FCC study where strongly damped RF structures are required to accelerate high beam currents, a new slotted waveguide cavity called SWELL has been proposed. The design is based on an elliptical cavity shape split into four quadrants making it compatible with Niobium-on-Copper coatings. A first prototype at 1.3 GHz has been fabricated at CERN to demonstrate the feasibility of this new cavity topology. This paper reports on the manufacturing steps of the individual quadrants, the surface preparation including chemical electropolishing and thin film coating, and the assembly process of the cavity in clean environment. First RF tests results of this prototype at cryogenic temperature are presented and compared with standard tesla cavity performances. The measurement of the trapped flux surface resistance is also reported and discussed. Finally, we highlight advances in the design and development plan of such cavity concept for future high intensity SRF accelerators.