NAPAC25 - North American Particle Accelerator Conference 2025

Electro-mechanical oscillations and instabilities in PIP-II SSR2 and LB650 cavities.

Not scheduled

20m

SAFE Credit Union Convention Center

Poster Presentation MC5 – Beam Dynamics and EM Fields MC5

Speaker

Alexander Sukhanov (Fermi National Accelerator Laboratory)

Description

Instabilities in room temperature accelerator RF cavities due to interaction between electromagnetic RF field and mechanical vibrational modes of the cavity has been observed in 1960s [1,2]. In superconducting RF (SRF) cavities these types of instabilities may be even stronger because of larger beam loading factor (Q_L), large cavity field, and stronger effects of cavity de-tuning due to ponderomotive forces (so-called Lorentz force de-tuning, LFD). In this paper we present observation of electro-mechanical oscillations (EMO) and instabilities in PIP-II SSR2 and LB650 cavities. Analytical and computational models of EMO are discussed, and stability criteria are defined.