Thermal Analysis of He II cooled Nb3Sn superconducting coil samples

Thursday 6 Feb 2020, 11:00 → 12:00 Europe/Zurich

30/7-010 (CERN)

Kirtana Puthran (CERN)

Abstract:

The knowledge of heat transfer mechanisms is essential in determining safe operating margins of the magnets. In this context, experiments measuring thermal performance of two Nb3Sn coil samples (D11T and MQXF) in superfluid helium have been carried out at the Central Cryogenics Laboratory at CERN. The heat load is generated via AC losses induced by a superconducting coil external to the samples, with the temperature measured in situ. The results revealed presence of helium within the samples and estimates of porosity are made with 1D simulations and visual inspections of cut samples. Further, heat transfer coefficients extracted from data analysis are used to make first order estimates of inner and outer coil layer temperatures in the range of HiLumi power deposition levels.