IPAC'25 - the 16th International Particle Accelerator Conference

Performance of HOM dampers in the 100 MHz RF cavities in the MAX IV 3 GeV ring

WEPS064

4 Jun 2025, 16:00

2h

Exhibiton Hall A _Salmon (TWTC)

Poster Presentation MC7.T06 Normal Conducting RF Wednesday Poster Session

Speaker

Henrique Duarte (MAX IV Laboratory)

Description

Throughout 2023 and 2024, higher-order mode (HOM) dampers were designed, manufactured and installed on the 100 MHz RF cavities in the 3 GeV ring at MAX IV Laboratory. Cavity HOMs have been the main driving source of longitudinal coupled-bunch modes (LCBM) in the ring. This contribution presents the impact of the HOM dampers via measurements performed on the cavities at different operating temperatures. Measurements were made of the transmission between two probe antennas, the fields excited in the cavities by a single bunch stored in the ring and the damping rates of the LCBMs extracted using the drive-damp technique with a multibunch stored beam.