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

Fully experiment request driven beta* and separation luminosity levelling at the LHC

THPS047
5 Jun 2025, 15:30
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC6.T33 Online Modelling and Software Tools Thursday Poster Session

Speaker

Michi Hostettler (European Organization for Nuclear Research)

Description

During the third run period (2022-2026) of the CERN Large Hadron Collider (LHC), as well as for the future High-Luminosity LHC era, luminosity levelling is key to control the event pile-up in the experiments as well as the heat load to the cryogenic system of the superconducting magnets close to the interaction points. During 2024 proton physics operation, a new luminosity levelling scheme was introduced for the high-luminosity experiments, ATLAS and CMS. Combining levelling by optical squeeze (beta) with small transverse separation changes gives the beam stability benefits of beta levelling (head-on tune spread and landau damping) while keeping the flexibility of separation levelling (independent levelling for each experiment in arbitrary steps of luminosity). This not only allowed each experiment to set their luminosity target independently, but also reduced the luminosity spread during levelling from 5%, when using just beta* levelling, to less than 3%, resulting in a more homogeneous data set.

Region represented Europe
Paper preparation format LaTeX

Author

Michi Hostettler (European Organization for Nuclear Research)

Co-authors

Andrea Calia (European Organization for Nuclear Research) Delphine Jacquet (European Organization for Nuclear Research)

Presentation materials

There are no materials yet.