SRF2025 - 22nd International Conference on RF Superconductivity

High Q – high G study on single cell medium grain niobium cavities

MOP14

22 Sept 2025, 14:30

3h

Ito International Research Center

Board: MOP14

Poster Presentation MC2: Fundamental SRF research and development Monday Poster Session

Speaker

Ashish Kumar (High Energy Accelerator Research Organization)

Description

Medium Grain Niobium (MG Nb) is a cost-effective material compared to Fine grain Nb (FG Nb) that has isotropic mechanical properties, and can clear the high-pressure gas safety criteria for a 1.3 GHz 9-Cell jacketed Tesla cavity. At KEK, various high Q – high G surface treatments have been applied to the 1-Cell MG Nb cavities and its performance has been measured via vertical tests, with and without trapped flux. It has been observed that the performance of these cavities are on par with FG Nb cavities for standard, 2-step and Mid-T furnace baking. Moreover, the flux expulsion of the single cell MG Nb cavity has been studied at 800 and 900 °C annealing.