Title: Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider
Language: English
Authors: Calatroni, S. 
Bellingeri, E. 
Ferdeghini, C. 
Putti, M. 
Vaglio, R. 
Baumgartner, T.
Eisterer, M.
Category: Research Article
Keywords: FCC; beam screen; HTS coating; thallium; Tl-1223
Issue Date: 2017
Journal: Superconductor Science and Technology
CERN has recently started a design study for a possible next-generation high-energy hadron–hadron collider (Future Circular Collider—FCC-hh). The FCC-hh study calls for an unprecedented center-of-mass collision energy of 100 TeV, achievable by colliding counter-rotating proton beams with an energy of 50 TeV steered in a 100 km circumference tunnel by superconducting magnets which produce a dipole field of 16 T. The beams emit synchrotron radiation at high power levels, which, to optimize cryogenic efficiency, is absorbed by a beam-facing screen, coated with copper, and held at 50 K in the current design. The surface impedance of this screen has a strong impact on beam stability, and copper at 50 K allows for a limited beam stability margin only. This motivates the exploration of whether high-temperature superconductors (HTS), the only known materials possibly having a surface impedance lower than copper under the required operating conditions, would represent a viable alternative. This paper summarizes the FCC-hh requirements and focuses on identifying the best possible HTS material for this purpose. It reviews in particular the properties of Tl-based HTS, and discusses the consequent motivation for developing a deposition process for such compounds, which should be scalable to the size of the FCC components.
DOI: 10.1088/1361-6668/aa6bd0
Library ID: AC15593130
URN: urn:nbn:at:at-ubtuw:3-8620
ISSN: 1361-6668
Organisation: E141 - Atominstitut 
Publication Type: Article
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