1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Investigation of octupolar resonances in the LHC using a non-linear segment-by-segment method

MOPM020
2 Jun 2025, 16:00
2h
Exhibiton Hall A _Magpie (TWTC)

Exhibiton Hall A _Magpie

TWTC

Poster Presentation MC1.A01 Hadron Colliders Monday Poster Session

Speaker

Sasha Horney (European Organization for Nuclear Research)

Description

During operation for luminosity production, the LHC runs with very strong Landau octupoles to ensure the collective stability of the beams. A disadvantage of this is that these octupoles can drive resonances which can be detrimental to beam lifetime. Recently, a special optics configuration has been utilised to reduce the impact of the main octupoles on lifetime. This design relies on correctly modelling the resonance driving term (RDT) response to changes in these magnetic circuits. This paper presents beam-based studies comparing the RDT response to simulations where large discrepancies were found. To try and understand the source of this, several approaches were taken. Various methods including individual circuit measurements, studies of other circuits, and tests at different energy were employed but it remained challenging to localise the source of the discrepancy around the ring. This paper presents an attempt to apply and extend a segment-by-segment method, that has been very effective at identifying local linear optics errors, to non-linear errors through analysis of RDTs.

Region represented Europe
Paper preparation format LaTeX

Author

Sasha Horney (European Organization for Nuclear Research)

Co-authors

Ewen Maclean (European Organization for Nuclear Research) Dr Felix Carlier (École Polytechnique Fédérale de Lausanne) Joschua Dilly (European Organization for Nuclear Research) Laurent Deniau (European Organization for Nuclear Research) Mael Le Garrec (European Organization for Nuclear Research) Philip Burrows (John Adams Institute) Rogelio Tomas (European Organization for Nuclear Research) Tobias Persson (European Organization for Nuclear Research) Vittorio Ferrentino (University of Naples Federico II)

Presentation materials

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