CERN Accelerating science

Published Articles
Report number	CERN-ACC-2015-308
Title	Beam Loss Monitoring for Run 2 of the LHC
Author(s)	Kalliokoski, Matti (CERN) ; Auchmann, Bernhard (CERN) ; Dehning, Bernd (CERN) ; Domingues Sousa, Fernando (CERN) ; Effinger, Ewald (CERN) ; Emery, Jonathan (CERN) ; Grishin, Viatcheslav (CERN) ; Holzer, Eva Barbara (CERN) ; Jackson, Stephen (CERN) ; Kolad, Blazej (CERN) ; Nebot Del Busto, Eduardo (CERN) ; Picha, Ondrej (CERN) ; Roderick, Chris (CERN) ; Sapinski, Mariusz (CERN) ; Sobieszek, Marcin (CERN) ; Zamantzas, Christos (CERN)
Publication	2015
Number of pages	4
In:	6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.MOPTY055
Subject category	Accelerators and Storage Rings
Abstract	The Beam Loss Monitoring (BLM) system of the LHC consists of over 3600 ionization chambers. The main task of the system is to prevent the superconducting magnets from quenching and protect the machine components from damage, as a result of critical beam losses. The BLM system therefore requests a beam abort when the measured dose in the chambers exceeds a threshold value. During Long Shutdown 1 (LS1) a series of modifications were made to the system. Based on the experience from Run 1 and from improved simulation models, all the threshold settings were revised, and modified where required. This was done to improve the machine safety at 7 TeV, and to reduce beam abort requests when neither a magnet quench or damage to machine components is expected. In addition to the updates of the threshold values, about 800 monitors were relocated. This improves the response to unforeseen beam losses in the millisecond time scale due to micron size dust particles present in the vacuum chamber. This contribution will discuss all the changes made to the BLM system, with the reasoning behind them.
Copyright/License	publication: © 2015-2024 The Author(s) (License: CC-BY-3.0)

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