CERN Accelerating science

Published Articles
Report number	CERN-ACC-2016-194
Title	First BTF Measurements at the Large Hadron Collider
Author(s)	Tambasco, Claudia (CERN ; Ecole Polytechnique, Lausanne) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Fuchsberger, Kajetan (CERN) ; Gąsior, Marek (CERN) ; Giachino, Rossano (CERN) ; Lefèvre, Thibaut (CERN) ; Levens, Thomas (CERN) ; Pieloni, Tatiana (CERN) ; Pojer, Mirko (CERN) ; Salvachua, Belen (CERN) ; Solfaroli Camillocci, Matteo (CERN)
Publication	2016
Number of pages	4
In:	7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPOY030
DOI	10.18429/JACoW-IPAC2016-WEPOY030
Subject category	Accelerators and Storage Rings
Abstract	During the Run I in 2012, several instabilities have been observed at the Large Hadron Collider (LHC) during the Betatron squeeze. The predictions of instability thresholds are based on the computation of the beam Landau damping by calculating the Stability Diagrams (SD). These instabilities could be explained by a deterioration of the SD due to beam-beam resonance excitation which could change the particle distributions. Beam Transfer Functions (BTF) provide a measurement of the Stability Diagram. The BTFs are sensitive to the particle detuning with amplitude as well as to the particle distributions therefore they represent a powerful tool to understand experimentally the stability of beams during the LHC operational cycle. First BTF measurements at the LHC are presented for different machine configurations and settings and compared to predictions.
Copyright/License	publication: © 2016-2024 The Author(s) (License: CC-BY-3.0)

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