17–22 May 2026
C.I.D
Europe/Zurich timezone

Impact of Landau Octupoles on the Transverse Beam Halo Distribution in the LHC

WEP5117
20 May 2026, 16:00
2h
C.I.D

C.I.D

Deauville, France
Poster Presentation MC5.D07: High Intensity Circular Machines Space Charge, Halos Poster session

Speaker

Chiara Maccani (European Organization for Nuclear Research)

Description

The distribution of beam halo particles in the Large Hadron Collider (LHC) is affected by non-linear fields, in particular by the Landau octupoles used to provide tune spread for beam stabilization. These elements introduce amplitude-dependent tune shifts that deform the transverse phase-space and may alter the steady-state halo population. In this study, tracking simulations are performed to quantify the expected halo distributions for different octupole settings, without beam-beam effect, and to investigate whether such non-linear effects could contribute to the variations observed in different measurements. The analysis aims to provide a first quantitative assessment of the potential correlation between octupole-induced non-linearities and the observed beam halo characteristics in the LHC.

Funding Agency

Research supported by the HL-LHC project

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Authors

Chiara Maccani (European Organization for Nuclear Research) Dora Veres (European Organization for Nuclear Research) Milica Rakic (École Polytechnique Fédérale de Lausanne) Pascal Hermes (European Organization for Nuclear Research)

Presentation materials

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