Speaker
Ashish Kumar
(High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI)
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, and the subsequent performance improvement has been confirmed with 900 °C annealing.
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Author
Ashish Kumar
(High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI)
Co-authors
Hayato Ito
(High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI)
Kensei Umemori
(High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI)
