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UPDATE ON BEAM INDUCED RF HEATING IN THE LHC

Benoît Salvant, O. Aberle, G. Arduini, R. Aßmann, V. Baglin, M.J. Barnes, Wolfgang Bartmann, P. Baudrenghien, O. Berrig, Chiara Bracco, E. Bravin, Giuseppe Bregliozzi, Roderik Bruce, A. Bertarelli, Federico Carra, Gregory Cattenoz, F. Caspers, S. Claudet, Hugo Day, M. Garlaschè, L. Gentini, B. Goddard, A. Grudiev, B. Henrist, R.M. Jones, O. Kononenko, G. Lanza, L. Lari, T. Mastoridis, V. Mertens, E. Métral, Nicolas Mounet, Juan Esteban Müller, Andriy Nosych, J.L. Nougaret, Serena Persichelli, A.M. Piguiet, Stefano Redaelli, F. Roncarolo, G. Rumolo, Belen Salvachua, Mariusz Sapinski, R. Schmidt, E. Shaposhnikova, L. Tavian, Marc Timmins, J. Uythoven, A. Vidal, J. Wenninger, Daniel Wollmann, Markus Zerlauth, P. Fassnacht, S. Jakobsen, M. Deile

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Abstract

Since June 2011 the rapid increase of the luminosity performance of the LHC has come at the expense of both increased temperature and pressure of specific, near-beam, LHC equipment. In some cases, this beam induced heating has caused delays while equipment cool-down, beam dumps and even degradation of some devices. This contribution gathers the observations of beam induced heating, attributed to longitudinal beam coupling impedance, their current level of understanding and possible actions planned to be implemented during the 1st LHC Long Shutdown (LS1) in 2013-2014.

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What this paper is about

Since June 2011 the rapid increase of the luminosity performance of the LHC has come at the expense of both increased temperature and pressure of specific, near-beam, LHC equipment. In some cases, this beam induced heating has caused delays while equipment cool-down, beam dumps and even degradation of some devices. This contribution gathers the observations of beam induced heating, attributed to longitudinal beam coupling impedance, their current level of understanding and possible actions planned to be implemented during the 1st LHC Long Shutdown (LS1) in 2013-2014.

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Available abstract

Since June 2011 the rapid increase of the luminosity performance of the LHC has come at the expense of both increased temperature and pressure of specific, near-beam, LHC equipment. In some cases, this beam induced heating has caused delays while equipment cool-down, beam dumps and even degradation of some devices. This contribution gathers the observations of beam induced heating, attributed to longitudinal beam coupling impedance, their current level of understanding and possible actions planned to be implemented during the 1st LHC Long Shutdown (LS1) in 2013-2014.

Key concepts: Large Hadron Collider, Beam (structure), Luminosity, Physics, Environmental science, Nuclear engineering, Electrical engineering, Nuclear physics

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