Beam-Beam Long Range Compensator Mechanical Demonstrator

• Published in: Journal of physics. Conference series 2024-01, Vol.2687 (8), p.82045
• Main Authors: Sito, L., Accettura, C., Bertarelli, A., Carra, F., Garlaschè, M., Gentini, L., Valenzuela, J. Guardia, Guinchard, M., Hoell, S., Motschmann, F., Papaphilippou, Y., Rossi, A., Sacristan de Frutos, O., Sterbini, G.
• Format: Article
• Language: English
• Subjects: Compensators; Preliminary designs; Thermal conductors; Vacuum brazing; Wire
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2687/8/082045

Beam-Beam Long-Range Compensators employing current-carrying wires are considered as valuable options in hadron colliders to increase dynamic aperture at small crossing angles. This paper presents a simple design proposal for application at CERN LHC. The preliminary design allows for a certain scalability of the number of modules, current flowing in the wire, and dimensions. It complies with two key requirements: (a) the use of a thin, bare metal wire that allows for movement as near to the beam as necessary while minimizing interactions with beam particles and meeting the specified DC current target; and (b) a wire support that is both an electrical insulator and a thermal conductor (ceramic). A molybdenum wire, vacuum brazed on an aluminium nitride support, is proposed, and the design is conceptually proved through the realization and extensive test of a demonstrator device. The wire brazing validation, as well as the system’s heat management, which are the most critical aspects, are given particular regard.