Coated conductor technology for the beamscreen chamber of future high energy circular colliders

T Puig,P Krkotić,P Demolon,A Granadeiro Costa,S Calatroni,A Romanov,M Pont,P C Pinto,D A Zanin,J Gutierrez,M Taborelli,H Neupert,F Perez,J O’Callaghan

doi:10.1088/1361-6668/ab2e66

Abstract

The surface resistance of state-of-the-art REBa2Cu3O7−x coated conductors has been measured at 8 GHz versus temperature and magnetic field. We show that the surface resistance of REBa2Cu3O7−x strongly depends on the microstructure of the material. We have compared our results to those determined by the rigid fluxon model. The model gives a very good qualitative description of our data, opening the door to unravel the effect of material microstructure and vortex interactions on the surface resistance of high temperature superconductors. Moreover, it provides a powerful tool to design the best coated conductor architecture that minimizes the in-field surface resistance. We have found that the surface resistance of REBa2Cu3O7−x at 50 K and up to 9 T is lower than that of copper. This fact poses coated conductors as strong candidate to substitute copper as a beamscreen coating in CERN’s future circular collider. To this end we have also analyzed the secondary electron yield (SEY) of REBa2Cu3O7−x and found a compatible coating made of sputtered Ti and amorphous carbon that decreases the SEY close to unity, a mandatory requirement for the beamscreen chamber of a circular collider in order to prevent the electron-cloud phenomenon.

Highlights

On the 4th of July of 2012 scientists at CERN announced the discovery of the Higgs boson based on collisions detected in the ATLAS and CMS detectors in the large hadron collider (LHC)
We have performed a study of the surface resistance and material compatibility for six different REBCO CCs, see table 1, conditions close to those found in the FCC-hh
We present the first experimental evidence that REBCO CCs are true potential candidates to substitute copper as the coating for the beam-screen chamber of future high energy circular colliders such as the FCC-hh in CERN or the super proton–proton collider by CAS- IHEP in China

Summary

Introduction

On the 4th of July of 2012 scientists at CERN announced the discovery of the Higgs boson based on collisions detected in the ATLAS and CMS detectors in the large hadron collider (LHC). The Higgs boson is responsible for the origin of mass of subatomic particles, and is an essential component of the standard model, one of the most successful theoretical frameworks in physics. Thanks to this discovery, on the 10th of December of 2013 Englert and Higgs were awarded the Nobel Prize in Physics for their theoretical prediction in 1964.

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