IPAC'25 - the 16th International Particle Accelerator Conference

Optics function determination using luminosity data

WEPM015

4 Jun 2025, 16:00

2h

Exhibiton Hall A _Magpie (TWTC)

Poster Presentation MC5.D01 Beam Optics Lattices, Correction Schemes, Transport Wednesday Poster Session

Speaker

Joanna Wanczyk (European Organization for Nuclear Research)

Description

Determining the betatronic waist shift and the ${\beta }^{\ast }$ at the interaction points through K-modulation in the Large Hadron Collider presents considerable challenges. This paper introduces a novel method for the measurement of these quantities, based on luminosity measurements and the van der Meer technique for reconstructing transverse bunch profiles.
The strategy involves colliding multiple bunches with distinct emittances, performing emittance scans, and subsequently shifting the collision point along the longitudinal plane via RF cogging. This shows promising potential to reduce uncertainties in the optics parameters at the interaction point and to obtain measurements of the absolute beam emittance. The first measurement using this technique was carried out at the Large Hadron Collider, with the analysis and findings discussed in detail.