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Model for heat dissipation by constrictions of electric field in granular thin film Niobium

Sep 19, 2022, 10:50 AM
30m
Auditorium

Auditorium

Theoretical approach for SRF Thin Films & Structures Theoretical approach for SRF Thin Films & Structures

Speaker

Claire Antoine (CEA)

Description

We propose an alternative model to explain power dissipation leading to the formation of hot spots in the inner walls of niobium porous thin film superconducting rf cavities. The physical mechanism that we explore is related to the constriction of surface electrical current flow at grain interface boundaries. These constrictions create an additional electrical contact resistance which induces localized punctual heat dissipation. The model is compared to experimental results and is able to very well fit the Q-slope data

Primary authors

Aymeric Ramiere (Shenzhen University, China) Claire Antoine (CEA) Jay Amrit (Associate professor)

Presentation materials

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