2012•DigitalCommons - CalPoly (California State Polytechnic University)Open access
LHC Impedance Model: Experience with High Intensity Operation in the LHC
Benoît Salvant, O. Aberle, G. Arduini, Ralph W. Assmann, V. Baglin, M.J. Barnes, P. Baudrenghien, A. Bertarelli, Chiara Bracco, Roderik Bruce, Xavier Buffat, Federico Carra, Gregory Cattenoz, F. Caspers, S. Claudet, Hugo Day, J.E. Mueller, M. Garlaschè, L. Gentini, B. Goddard, A. Grudiev, B. Henrist, W. Herr, S. Jakobsen, R.M. Jones, G. Lanza, L. Lari, T. Mastoridis, Elias Métral, Nicolas Mounet, Andriy A. Nosych, J.L. Nougaret, Serena Persichelli, Tatiana Pieloni, A.M. Piguiet, Stefano Redaelli, F. Roncarolo, G. Rumolo, Belen Salvachua, Mariusz Sapinski, Elena Shaposhnikova, L. Tavian, Marc Timmins, J. Uythoven, A. Vidal, Raymond Wasef, Daniel Wollman, A. Burov, S. White
Open full text 0 citations
Abstract
The CERN Large Hadron Collider (LHC) is now in luminosity production mode and has been pushing its performance in the past months by increasing the proton beam brightness, the collision energy and the machine availability. As a consequence, collective effects have started to become more and more visible and have effectively slowed down the performance increase of the machine. Among these collective effects, the interaction of brighter LHC bunches with the longitudinal and transverse impedance of the machine has been observed to generate beam induced heating, as well as longitudinal and transverse instabilities since 2010. This contribution reviews the current LHC impedance model obtained from theory, simulations and bench measurements as well as a selection of measured effects with the LHC beam.
Open-access reader