Macroparticle-induced losses during 6.5 TeV LHC operation

G. Papotti, M. Albert, B. Auchmann, E. B. Holzer, M. Kalliokoski, A. Lechner

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

13 Citations (Scopus)


One of the major performance limitations for operating the LHC at high energy was feared to be the so called UFOs (Unidentified Falling Objects, presumably micrometer sized dust particles which lead to fast beam losses when they interact with the beam). Indeed much higher rates were observed in 2015 compared to Run 1, and 20 fills were prematurely terminated by too high losses caused by such events. Additionally they triggered a few beam induced quenches at high energy, the first in the history of the LHC. In this paper we review the latest update on the analysis of these events, e.g. the conditioning observed during the year and possible correlations with beam and machine parameters. At the same time we also review the optimization of beam loss monitor thresholds in terms of machine protection and availability.

Original languageEnglish
Title of host publicationIPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference
PublisherJoint Accelerator Conferences Website (JACoW)
Number of pages4
ISBN (Electronic)9783954501472
Publication statusPublished - 1 Jan 2016
MoE publication typeA4 Conference publication
EventInternational Particle Accelerator Conference - Busan, Korea, Republic of
Duration: 8 May 201613 May 2016
Conference number: 7


ConferenceInternational Particle Accelerator Conference
Abbreviated titleIPAC
Country/TerritoryKorea, Republic of


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