IPAC'23 - 14th International Particle Accelerator Conference

Status of the beam-based measurement of the skew-sextupolar component of the radio frequency field of a HL-LHC-type crab-cavity

MOPL001

8 May 2023, 16:30

2h

Sala Laguna

Poster Presentation MC1.A01: Hadron Colliders Monday Poster Session

Speaker

Michele Carlà (ALBA-CELLS Synchrotron)

Description

Two High Luminosity Large Hadron Collider (LHC) type crab-cavities have been installed in the CERN SPS for testing
purposes. A first partially successful attempt to characterize the skew-sextupolar component of the radio frequency field of the crab-cavity
by means of beam-based techniques has been carried out in 2018.
The large orbit distortion produced by the crab cavity dipolar field combined with the multipolar errors in the SPS optics
resulted in some systematic errors that cannot be easily accounted for. After a major overhaul of the SPS turn-by-turn
BPM system a second attempt was carried out in 2022. In the attempt to keep under control systematic errors,
orbit correctors have been used to compensate the large orbit excursion produced otherwise by the crab cavity.
The results of the new measurement are here discussed.