CERN Accelerating science

Article
Report number	CERN-EN-2016-001
Title	The Long-Term Beam Losses in the CERN Injector Chain
Author(s)	Gilardoni, Simone (CERN) ; Bartosik, Hannes (CERN) ; Benedetto, Elena (CERN) ; Damerau, Heiko (CERN) ; Forte, Vincenzo (Universite Blaise Pascal (FR)) ; Giovannozzi, Massimo (CERN) ; Goddard, Brennan (CERN) ; Hancock, Steven (CERN) ; Hanke, Klaus (CERN) ; Huschauer, Alexander (CERN) ; Kowalska, Magdalena (CERN) ; Mcateer, Meghan Jill ; Metral, Elias (CERN) ; Mikulec, Bettina (CERN) ; Papaphilippou, Yannis (CERN) ; Rumolo, Giovanni (CERN) ; Sterbini, Guido (CERN) ; Wasef, Raymond (Johann-Wolfgang-Goethe Univ. (DE)) ; Arduini, Gianluigi (CERN) ; Meddahi, Malika (CERN) ; Chapochnikova, Elena (CERN)
Publication	2015
Imprint	10 Feb 2015
Number of pages	5
In:	54th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams, East-Lansing, USA, 10 - 14 Nov 2014, pp.THO1LR01
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC
Abstract	For the production of the LHC type beams, but also for the high intensity ones, the budget allocated to losses in the CERN injector chain is maintained as tight as possi- ble, in particular to keep as low as possible the activation of the different machine elements. Various beam dynamics effects, like for example beam interaction with betatronic resonances, beam instabilities, but also reduced efficiency of the RF capture processes or RF noise, can produce losses even on a very long time scale. The main different mecha- nisms producing long term losses observed in the CERN injectors, and their cure or mitigation, will be revised.

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