Abstract
The international study at CERN of a possible future circular collider (FCC) considers an option for a very high energy hadron-hadron collider located in a quasi-circular underground tunnel of about 100 km of length. The technical segmentation of the collider foresees continuously cooled sections of up to 10.4 km; throughout the entire section length, more than 600 kW of heat mainly generated by the beam synchrotron radiation must be removed from the beam screen circuits at a mean temperature of 50 K. The cryogenic system has to be designed to extract the heat load dependably with a high-efficiency refrigeration process. Reliable and efficient cooling of the FCC beam screen in all possible operational modes requires a solid basic design as well as well-matched components in the final arrangement. After illustrating the decision making process leading to the selection of an elementary hydraulic scheme, this paper presents preliminary conceptual designs of the FCC beam screen cooling system and compares the different schemes regarding the technical advantages and disadvantages with respect to the exergetic efficiency.
Highlights
The Future Circular Collider (FCC) under conceptual study at CERN will have a circumference of about 100 km
The heat absorbed in the beam screen cooling (BSC) cycle will be transferred to a refrigeration cycle using a helium-neon mixture (Nelium) as cryogen, which is under development by Dresden University of Technology [2]
The major part of the circulator power is extracted in a heat exchanger working at ambient temperature (HXa); the terminal temperature difference (T T D) in the necessary internal heat exchanger (HXi) though causes an additional amount of heat to extract at cryogenic temperature level
Summary
To cite this article: C Kotnig et al 2017 IOP Conf. Ser.: Mater. - Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider S Calatroni, E Bellingeri, C Ferdeghini et al
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