Beam loss monitoring for run 2 of the LHC

M. Kalliokoski, B. Auchmann, B. Dehning, E. Effinger, J. Emery, V. Grishin, E. B. Holzer, S. Jackson, B. Kolad, E. Nebot Del Busto, O. Picha, C. Roderick, M. Sapinski, M. Sobieszek, F. S. Domingues Sousa, C. Zamantzas

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)


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 nor 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.

Original languageEnglish
Title of host publication6th International Particle Accelerator Conference, IPAC 2015
Number of pages4
ISBN (Electronic)9783954501687
Publication statusPublished - 1 Jan 2015
MoE publication typeA4 Article in a conference publication
EventInternational Particle Accelerator Conference - Richmond, United States
Duration: 3 May 20158 May 2015
Conference number: 6


ConferenceInternational Particle Accelerator Conference
Abbreviated titleIPAC
CountryUnited States

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