Updates on Impedance Studies for the FCC-ee High Energy Booster
Abstract
Following the Future Circular Collider (FCC) Feasibility Study completion, the impedance model for the FCC-ee High-Energy Booster (HEB) has been significantly expanded beyond the initial copper vacuum pipe resistive wall analysis. This paper presents a comprehensive impedance and wake budget incorporating RF cavities, bellows, and beam position monitors, evaluated through 3D electromagnetic simulations and analytical methods. The updated model provides the basis for future beam dynamics studies, including transverse coupled bunch instability analyses and single bunch tracking simulations. The present work focuses on the construction and comparison of the main impedance and wake contributions, identifying the dominant sources and the components requiring further investigation. These results will be used to refine the HEB collective effects studies and to support future assessments of instability margins and mitigation requirements.
Comments: 17th International Particle Accelerator Conference (IPAC'26)
Cite
@article{arxiv.2605.29799,
title = {Updates on Impedance Studies for the FCC-ee High Energy Booster},
author = {Keon Hee Kim and Adnan Ghribi and Santiago Martinez and Quentin Bruant and Antoine Chance and Barbara Dalena and Chiara Antuono and Dora Gibellieri and Carlo Zannini and Frank Zimmermann and Ahmad Mashal and Mauro Migliorati and Mikhail Zobov},
journal= {arXiv preprint arXiv:2605.29799},
year = {2026}
}